The possibilities of tuning the H6 (potential output)

[Chicane]

I talked to a guy who's .. well... a math / car geek today, but he's cool as hell. He was using all these equations in regards to figuring out how much power we could get from our engines... but basically, here's the end result:

3.3 liter punched out to 3.5 liters (can we do that?)
new valvetrain (springs, valves, etc)
headwork
headers
bumpier cam

it'd be reasonable to assume 300hp when everything is said and done.

With a turbo running 5psi...

360hp sounds pretty easily achievable.

So yeah. :D

[Trevor]

R. your mate is assuming that the SVX has a cheaply specified and designed engine which has vast room for modification and improvement.
It is, as delivered a very sophisticated unit in respect of the items he has elected to improve. The power output and wide torque range which has been achieved with a capacity of only 3.3 L proves the point. I t is difficult to improve on what is already excellent. That said forced induction, which he has not mentioned, is another issue.

[solarsvx]

chicabe,, posible yes, practicle no.


300 hp in our 3,600 lb tank is stil slow not too mention a tranny that wontknow what to do with real power.

[Chicane]

With a 5spd or 6spd conversion it'd be fine.

Plus it'd be lighter.

[solarsvx]

5 speed conversion only shed 100 lbs at most. to 3,400 lb car,, stil a tank.


300 hp and 5 speed conversion in a svx. maybe hit low 14s still not a fast car. compared to the big boys. and they are stock.

[Phast SVX]

100 lbs? Wanna bet? The autobox is a hell of a lot heavier then my 5spd, and my wheel well has about an extra inch of gap in it
phil

[Phast SVX]

Originally posted by solarsvx
5 speed conversion only shed 100 lbs at most. to 3,400 lb car,, stil a tank.


. compared to the big boys. and they are stock.

and hate to break it to you but an SVX with stock auto and 105 shot of nitrous will run a 14.2 and its been proven in a previous thread.
phil

[Chicane]

I think a 300hp SVX would run 13s if it had some weight reduction... and a 300 hp SVX with some nitrous would DEFINITELY be well into the 13s.

Anyway, this topic has inspired me to start a new thread.

[mbtoloczko]

Originally posted by solarsvx
5 speed conversion only shed 100 lbs at most. to 3,400 lb car,, stil a tank.


300 hp and 5 speed conversion in a svx. maybe hit low 14s still not a fast car. compared to the big boys. and they are stock.

The curb weight of a WRX with a manual tranny is 3100 lbs. An L AWD SVX should weigh in at about 3400 with a manual tranny. That's a 300 lb difference, but I don't see that as being such a big difference as to classify the SVX as a tank. If it weighed in at 4000 lbs, then I would call it a tank.

[cxt2001]

svx is heavy but not a tank, u gotta admit it has some performance aspects but mainly not a drag car supposed to be racing ricers...period 325 hp svx would be niccccce. So Phast whats the deal with that Cobb tuning the eg33 engine? I'm curious about that...plz expand on that...thanks

[Templar]

I keep seeing this popup here now and then and I still get baffled.

1997 Subaru SVX Lsi= 3580 lbs
1997 Subaru SVX L=3525 lbs
Skyline R34= 3673 lbs
1995 300zx Twin Turbo= 3518 lbs
3000 GT VR-4= 3803 lbs

I don't hear too many Skyline or 300ZX turbo owners complaining that their cars are too heavly to ever be a serious performer.

[solarsvx]

templar they may have the same weight. but they run 13s stock with NOS or serous motor modifications.


14.3 with a 100 shot of NOS isnt what i call true power its something u bolt on whene u are desperate for power. well since we a own a svx i guess we are pretty desperate LOL .


the fact of the music, no svx i have seen or even heard of ever rans 13s or lower. even if there was one in exsistance thats just one.

we have in florida wel lorlando alone to supras breaking in the 10s right now with stock internals

we have a few 300zxs runing 11s

we have lots of dsms runing in the low 11s and hi 10s

we have some wrx runing some 13s also

we have zero !!! svx every runing any of those times in the whole country.

i would say if u want go fast buy a car that can handle it. no need for serous motor build ups.. 500 NOS shots, 5 speed conversions, yada yada

keep your svx as a nice cruising car and with some what power.

[RRX]

Originally posted by Templar
I keep seeing this popup here now and then and I still get baffled.

1997 Subaru SVX Lsi= 3580 lbs
1997 Subaru SVX L=3525 lbs
Skyline R34= 3673 lbs
1995 300zx Twin Turbo= 3518 lbs
3000 GT VR-4= 3803 lbs

I don't hear too many Skyline or 300ZX turbo owners complaining that their cars are too heavly to ever be a serious performer.

I agree....A Supra is heavy as well. All of these cars, including the SVX are Luxury sports coupes or GT's. The SVX just happens to be the only one that is underpowered. I never hear the 3000gt people crying because there car is heavy or because its a Luxury GT and not a true sports car. They still make it faster.

[Phast SVX]

Originally posted by solarsvx
templar they may have the same weight. but they run 13s stock with NOS or serous motor modifications.


14.3 with a 100 shot of NOS isnt what i call true power its something u bolt on whene u are desperate for power. well since we a own a svx i guess we are pretty desperate LOL .


the fact of the music, no svx i have seen or even heard of ever rans 13s or lower. even if there was one in exsistance thats just one.

we have in florida wel lorlando alone to supras breaking in the 10s right now with stock internals

we have a few 300zxs runing 11s

we have lots of dsms runing in the low 11s and hi 10s

we have some wrx runing some 13s also

we have zero !!! svx every runing any of those times in the whole country.

i would say if u want go fast buy a car that can handle it. no need for serous motor build ups.. 500 NOS shots, 5 speed conversions, yada yada

keep your svx as a nice cruising car and with some what power.


You wann know why tht is? Becuase people like you keep ttrying to tell EVERYONE that it is impossible! You know damn well how much a 10s surpa costs to get it there, and you even more so how much the first 10's mkiv supra cost(titan motorsports estimated 50 grand in supporting modds alone in 95)
- a single turbo kit 4-7 grand installed ,
-front mount kit with piping,1500,
-fuel system (pump, injectors, you need a GCC and a vpc) ~2000 depeding on installation
if you get 11's, ths stock autobox will begin to fail due to not having enough line pressure to shift, so...
SP400 trans: 5grand installed, fi your lucky
timing gears 500 installed if your good again

Solar, you know any fast car is going to pullsome money. You talk about how cars have"13's stock" but what you fail tomention with thoes 10,s and 11,s come thousands upon thousands of dollars in not only parts, but dynotuning and instalation. The supras block is somthing special, and is one in amillion you and i both knwo that. And yes it would cost alot to move the SVX, and no one has done it, but watch out for me. Becuase i will.
phil

[solarsvx]

phast svx.

fact no 13 second fast svx out there one in existant

fact it is posible.

fact why ???.



also fact supras can run over 500 hp runing stock internals and stock turbos.

fact a dsm can run 400 hp range with stock internals

fact svx 240 hp will need major engine build up to even hit what these cars run stock. with out laughing gas.


the only way to get major power from teh eg33 is boost thats what every one else does.. has any one run 20 psi of boost and run 13s in a svx no, will any one ever do this no!!! its not feasable and afordable.

even if the slightest hint of a 13 second svx no one wil give 2 ****s abought it in the real world race cars.

its not a race car !!!!!

i wont even want to begin or where to start to make a svx all motor no NOS run 13s.

eliminate a/c sytem, shed 600 lbs off the car "imposible" almost.

elminate some of the 1000 lb glass windows the svx has.

5 speed conversion with a heavy duty transmsions to hand the AWd system

major and i mean major egine rebuild from ground up..

no bumper reinforcements adds weight.

solid motor mounts,

reinforced drive shaft and axles.

bye the time u do all this and then some u have taken all great that has made the svx what it is.


so u want a fast svx u have 2 options

major egine rebuild from grount up. maybe 300 hp range big maybe

turbo charger,, 4-5 psi maybe hit 300 hp range. without opening the egine.

with the bolt on turbo kit i have heard nothing good and nothing fast from it, waste of 3,500 or whatever the rip off price is

[Phast SVX]

ANY FAST CAR TAKES MONEY....i have completed my 5spd conversion with MY03 components(stronger then previous years) ACT 2600lb clutch, sti mounts, 4.11 diffs etc. The car on a gtech pro ran a 14.9, and i will be running at the track in april and expect low 15's on my 171k engine. this is drivetrain only modifications. Andi dropped OVER A SECOND on querter already. I will be doing botom end work, and 2.2 pistons. And that WILL take boost. our block is a very capable one, and you dont have to lecture me about DSM's,you know i had a 16g'd GST as well. Im saying that different cars need diff work in a couple areas, stroked 2.5's tear up with lowered compression and boost, and stroking our engine while incorporating a lower compression rate piston will alow me to make boost. Think of if this way. the non turbo 2jz block is the same as the turbo. The NT has as much potential as the turbo block, bu requires more work. This will require some steps before i get to the level of the turbo, but i wil do it.
phil

[mbtoloczko]

My feeling is that Porter and his supercharger project is the ticket to significantly boosting the HP on the SVX without resorting to NOS and the ugliness of a turbo. The SVX has high compression, but I think 50 HP should be attainable without putting too much stress on the motor. Perhaps with higher flow fuel injectors (if you believe that the stock injectors can't supply enough fuel for 300 HP) a properly designed cold-air intake, and a nice exhaust, 300 HP should be possible without NOS? Toss in a 5 speed tranny, and I'd guess that high 13 second 1/4 miles would be possible if you felt like trashing the 5 speed tranny. Maybe $5k for the HP and $3k for the tranny? Considering that a nice used SVX can be had for less than $10k, I think this means you could have a very fun car for signficantly less $$$ than a new car with similar HP and features. My $0.02 (and my overall plan). Now if Porter would just finish (start?) on the supercharger project!

[solarsvx]

phill i know our eg33 egine has huge potential. the platform is there. 4 cams built awsome svx egineers gets my praise.

how abought this u get that svx in the 13s for me i will buy u a whole keg of beer !!!!! tee hee

that gives me braging rights if even one svx can run 13s.

but a 5 speed is most definatly the 1st and only choice to go for performance. so u are on the right track.

[Aredubjay]

Originally posted by solarsvx
phill i know our eg33 egine has huge potential. the platform is there. 4 cams built awsome svx egineers gets my praise.

how abought this u get that svx in the 13s for me i will buy u a whole keg of beer !!!!! tee hee

that gives me braging rights if even one svx can run 13s.

but a 5 speed is most definatly the 1st and only choice to go for performance. so u are on the right track.

Nice gesture, solar. Hmm. For offers like that, I might just have to see what I can do to the "Evil Twin." :D:D:D

[solarsvx]

LOL randy ..


i think we should make a foundation to the "13 second svx" foundation.


and we wil need lots of contributions on that =>


make shure whoever doe has the video and time slip. so i can start braging to my freinds ha !!!! see there is a fast svx out there !!:D

ohh i ran 15.3 with mine not too shaby.. took me a few runs to do it

[Aredubjay]

Originally posted by solarsvx
LOL randy ..


i think we should make a foundation to the "13 second svx" foundation.


and we wil need lots of contributions on that =>


make shure whoever doe has the video and time slip. so i can start braging to my freinds ha !!!! see there is a fast svx out there !!:D

ohh i ran 15.3 with mine not too shaby.. took me a few runs to do it

Did you remove your passenger's side, side marker? Or, is that allowed? It'd give you better air flow. Pop it out for your runs, then, pop it back in when you get ready to go home. That's not considered a "modification" is it? :D

[Phast SVX]

Originally posted by Aredubjay


Did you remove your passenger's side, side marker? Or, is that allowed? It'd give you better air flow. Pop it out for your runs, then, pop it back in when you get ready to go home. That's not considered a "modification" is it? :D

hmmm that is odd...never heard of one running that fast...you must have somekind of freak!
sorri quoted randy istead of solar!
phil

[subafan]

i thoguht i have read somewhere before on this site about someone who put a turbo to the svx engine and is running low 14s, high 13s?

[Landshark]

Originally posted by solarsvx
how abought this u get that svx in the 13s for me i will buy u a whole keg of beer !!!!! tee hee

<Alan runs to garage to get JATO rockets and some duct tape>

[solarsvx]

LMAo land shark ,, strap a jet engine on the back of a svx,, then where talking!!! :D

that night i ran 15.3 wasa supr cold night. i had a ram air intake on it. and one lucky r/t its was a hi 15.3 15.38 or something.

i only ran that once so i guess it was a freak tee hee, rest where alld 15.5s and 15.6s

i dont run that any more due to my 100 lbs 18" rims, =<

[Earthworm]

I'm still wondering if Earl's "blue" would be capable of 13's the way it is right now?

[Templar]

We will be building a beast of an SVX for JABevin on this board. The project will be starting pretty much as soon as we have finished testing the supercharger prototype for the 2.5.

JABevin's car will not be using a supercharger, as a matter of fact what we have in mind to do to it may surprise some of you.

Our goals for the project are very simple. 500 hp at the crank. suspension to handle the heft of the SVX and brakes to handle the weight, mass, and new found velocity of the car.

Not only is this achievable, but it should not be as expensive to accomplish as most people think. We have decided to take a new train of thought into the project. I will hold off on the details for now.

We do still plan on making a supercharger kit for the SVX as well, for those who will settle for 300 at the crank.

Kent
DNT Performance

[GreenMarine]

If anyone knows how to get to DNT performance... Please let me know... I want to stop by there and see what all the talk is about... Templar, If you are seriouse about all that talk of 500Hp and you can do most of that for about $5000 or so, let me know, I will be sending ya another SVX to play with!!!!!

[NomadTW]

hurah templar, you=my hero

now hurry up w/ that s/c kit for the 2.5's so i can get the s/c kit for the svx

[elninoalex]

Well, we'll soon see what a 75hp shot(for starters) and a 5 spd can do.

[Templar]

GreenMarine,

We are currently working out of a private shop in Greenville SC, and a garage in Asheville NC. I am trying to get everything together to move us into a more substantial, permanent, self contained, and public local within the next few months.

I am fairly certain we could do 300 hp SVXs all day long for under $5000. Josh's car is going to be something entirely different though. I am also working on getting some coil overs built for the SVX as well, and possibly some big brake upgrade kits. My biggest issue with everything is time. I have a day job that I am hoping to leave so that I can put more time into building some good fast Subarus, and other cars for that matter. Unfortunately, said day job has been really detremental to my time lately, but that is beginning to clear up.

Right now if anyone has any questions feel free to email me at dntperformance@charter.net I should also have Kent@dntperformance up soon as well.

[Matthewmongan]

Originally posted by RRX


I agree....A Supra is heavy as well. All of these cars, including the SVX are Luxury sports coupes or GT's. The SVX just happens to be the only one that is underpowered. I never hear the 3000gt people crying because there car is heavy or because its a Luxury GT and not a true sports car. They still make it faster.

oh yeah i know alot of 3000gt owners that say they have a gt and it will never be a 9 second car because of the weight (sounds like something a few of us have said from time to time.)

i think its possible to have a fast svx but their is no demand if their were 50,000 of us then we would have the buying power for the large corporations like sti to pay attention to our needs and make parts for our cars. but we are so few :(

[svxash]

Originally posted by Matthewmongan


oh yeah i know alot of 3000gt owners that say they have a gt and it will never be a 9 second car because of the weight (sounds like something a few of us have said from time to time.)

i think its possible to have a fast svx but their is no demand if their were 50,000 of us then we would have the buying power for the large corporations like sti to pay attention to our needs and make parts for our cars. but we are so few :(
I agree with the production number issue. I just sold a MKII Supra (approx 3000 lbs). Toyota made 115,000 MKII's vs 25,000 SVX's made. It seems there are more performance parts available for cars produced in numbers. I can't even find a windshield from a glass company that doesn't have to get it from the dealer!! Alot of the MKII Supra guys do a 7mgte conversion which is dropping in a turbo motor from a MKIII Supra. One guy has one that has 391 RWHP & 394 RWTQ. This engine from the factory was designed for a turbo (piston oil squiters,etc.)You do the math. 3000 lbs/391 rear wheel hp(7.67 lbs/hp) vs 3500 lbs and ? rear wheel hp. I'll enjoy our SVX for what it is, a unique car that turns alot of heads and is alot of fun to drive (maybe a more aggressive exhaust growl)

[Chiketkd]

I think the production issue is the biggest reason, but another is the fact that Subaru didn't offer the 3.3L H6 engine in any other car. I think some Outbacks & Foresters got a 3.0L H-6, but none of those cars have a following from young, performance oriented buyers...

-Chike
Originally posted by svxash
I agree with the production number issue

[svxhunter]

Originally posted by solarsvx

fact no 13 second fast svx out there one in existant


Correction:

FACT: There is at least one 13 second SVX. It's mine- it ran on a completely STOCK engine AND tranny.

AND, it was built for under $2000 including the original purchase price.

Check my locker- timeslips are there.

By this time next year, I'll have 2- 13 second SVX's, one should be in the 12's. Both under $2000 on stock motors.

I doubt mine is the fastest. There are several people on this website who are a great deal more knowledgable than me and willing to spend more money.

Production numbers are everything. R&D of performance parts costs millions. Only a fool would invest that kind of money in a car with low production numbers.

The Supras, Skylines, etc. with great aftermarket support had HUGE production numbers. Manufacturers invested in after market stuff, because they could make money.

The SVX could be incredibly fast. It will NEVER have the significant aftermarket support because there is no profit involved.

It's a fine automobile. In it's factory form it rivals any of the others in their factory form. Enjoy it.

:) ;) :)

[sorceror]

Sounds to me like We shouldn't be trying to run 12's or 13's on the drag strip.

I still like the way it hadles in the mountains ... 85 mph in 40 mph zones?

I'd like to see some of those 2 wheel drive cars with pumped up horsepower keep up!!!!!!

[poweredx2]

Who is this guy talking this nonsense about no 13 second svx exists,well in my driveway sit a 94 fwdsvx with 100 shot zex kit that has several 13.8 second timeslips and several 14.7-14.9 at 95mph on motor with a stock tranny,also I think phil runs deep 13s,so what the issue you say turbo zs and supras runs 13s,well take the turbos off and bamm they are slower the me I know I streetrace.Just because you haven't seen a 13 second svx don't mean we don't exists and pray you needed race one.Turbo zs and supras can't even match my fwd 60ft times on street tires 2.20.

[deruvian]

Originally posted by poweredx2
Who is this guy talking this nonsense about no 13 second svx exists,well in my driveway sit a 94 fwdsvx with 100 shot zex kit that has several 13.8 second timeslips and several 14.7-14.9 at 95mph on motor with a stock tranny,also I think phil runs deep 13s,so what the issue you say turbo zs and supras runs 13s,well take the turbos off and bamm they are slower the me I know I streetrace.Just because you haven't seen a 13 second svx don't mean we don't exists and pray you needed race one.Turbo zs and supras can't even match my fwd 60ft times on street tires 2.20.

I'm not even sure how to respond to that. The random usage of punctuation makes for a tough read.

[Matthewmongan]

Originally posted by deruvian


I'm not even sure how to respond to that. The random usage of punctuation makes for a tough read.

whats... wrong !**!!%% w.it,,h random() punctuat!on >!@#$^^ ;)

[poweredx2]

Well from reading magazines on your wrx it'll take more money to run with a stock sti than it would for a svx,I raced one from a 40mph roll to about 120 and he was at my front wheelwell.Also 500 dollars for a zex kit to run 13.78 at 106 isn't bad so keep trying to teach school and correcting post because 13.4 at 100mph is a turtle for a WRX.One more thing my svx on nitto 555 drag radial will turn a 1.82 60ft but I don't brag about that. I posted my times on street tires which is great for a fwd car,if I had a car that only ran 100mph with the boost turned up I would kill myself for buying such a pig.YEAH!

[poweredx2]

A few months ago sportcompactcar magazine conducted a wrx shootout.Judging from that, ten grand is a lot of money just to have a wrx run with a stock sti,put that money in a svx on drag radials it will run over a stock sti,we have members all over the world but you the mouseballs to make such a statement about our cars.

[poweredx2]

The reason so many svxes are not fast is because to many owners are too busy correcting post,no wonder there is no support for the svx.:mad:

[Matthewmongan]

i am now getting confused if 13 at 100mph is slow for a wrx then why does it cost ten grand for it to compete with an sti, and why do our cars only need drag radials to kick but at the track ,because in my experience i need more than that. and 100 shot of NO2 is not a good start its a short cut .. please believe me that i would have it my car in a heartbeat. :D


if you could find liquid swartch id use that too.

(someone has to get that reference think mel broks... space balls the movie)

[poweredx2]

500-600hp supras running 13s every year.All the horsepower needed to race is what you can put down.Nissans and Toyotas don't hook well on street tires and high hp,to me its a good dyno car something to impress your drinking buddies,and I don't drink.

[Matthewmongan]

Originally posted by poweredx2
The reason so many svxes are not fast is because to many owners are too busy correcting post,no wonder there is no support for the svx.:mad:


no its because "the MAN" is keeping us down

[poweredx2]

I was just referring to what is in black and white,also we just wanted you to understand that if nos is cheating,then why not post your time w/o your turbo,hummm sounds like cheating you may run a mid 16 compared to my several 14.7-14.9 at95mph on motor, no contest,there are no rules in the go fast game get there any way you can.You do make a good point the svx is not a drag car its a SLEEPER.

[Matthewmongan]

oh no NO2 isn't cheeting its just inexpencive Hp and its faster to tune that a turbo or supercharger thus makeing it a short cut to the power i dont know why rice runners get all up tite about nos and zex andthe "bottles are for babies and I EAT BABIES LIKE A MODEST PROPOSAL" id have it on my car if i didn't spend my money on cheep women.

[want-a-fast-svx]

I always wondered why nos is considered cheating but whenever someone has a turbo or supercharger and is running 20lbs of boost thats legit and not "cheating" if u will?.?. Just a thought...

[Myxalplyx]

Originally posted by want-a-fast-svx
I always wondered why nos is considered cheating but whenever someone has a turbo or supercharger and is running 20lbs of boost thats legit and not "cheating" if u will?.?. Just a thought...

It's just a preference that's all. There are some folks that say it is cheating because it's not there all the time like a supercharger or turbo. That fits their criteria for cheating. It doesn't matter though. Forced induction is forced induction and a the track, you'd probably be lumped in with supercharged and turbo'd cars anyways ('cept maybe an autox or other venue).

I've always thought that an SVX with 4.44 gearing and a 100-150hp shot of nitrous would rule. :p I'll take two!

[Chiketkd]

I would love to find a 4.44 geared trans that would work with our cars and TCU. Seems like 4.11 would be the shortest gearing that can be done.

I'm not a fan of NOS, but I don't see it as cheating either. A win is a win, and since NOS is legal at dragstrips, it is something that all drag racers will run into at some point.

-Chike
Originally posted by Myxalplyx
I've always thought that an SVX with 4.44 gearing and a 100-150hp shot of nitrous would rule. :p I'll take two!

[deruvian]

Originally posted by Chiketkd
I would love to find a 4.44 geared trans that would work with our cars and TCU. Seems like 4.11 would be the shortest gearing that can be done.

I'm not a fan of NOS, but I don't see it as cheating either. A win is a win, and since NOS is legal at dragstrips, it is something that all drag racers will run into at some point.

-Chike


4.11 and 4.44 are not the only final drive ratios that can be used. Aside from the stock 3.54, there were some Subarus that had 3.90 and 3.70.