SVX get a 2.2 tranny w/ 4:11 - Page 2

Landshark · #16 03-02-2004, 11:06 PM

i don't know squat about tranny internals - what needs done? can the gears and diff be replaced in the SVX 4EAT, does the whole tranny have to be replaced, cost?

somebody help me out. i don't do a lot of highway driving, so i'm not worried about that. this might be a nice mod to keep me from getting an STi for a while.

GreenMarine · #17 03-03-2004, 08:04 AM

Quote:

Originally posted by Subafreak

I can't help it, it just gets up to speed so fast now.

Do ya reckon that it's faster than the 5 MT conversion???

#18 03-03-2004, 08:10 AM

Quote:

Originally posted by GreenMarineSVX

Do ya reckon that it's faster than the 5 MT conversion???

well, the 5MT conversion could theorerically be slower if you used taller final drives.. it could also be quicker if you used 4.44's..... the real "difference" between the 4EAT and 5MT (besides the obvious mechanical advantage of fewer clutches and moving parts in an MT) is WEIGHT.. so two SVX'i, one with a 4EAT and one with w/5MT, both with identical final drives and a guy who knows how to work a clutch...

i assume the 5MT will outrun the 4EAT by a hair based on weight savings alone.

and it's my guess that the 4EAT will grenade well before the 5MT, giving the MT driver a hefty advantage on the track

-adam

huck369 · #19 03-03-2004, 08:48 AM

Plus there is less drivetrain loss through the manual tranny

(been preaching the 4.11 Auto swap for years)

SVX-FF · #20 03-03-2004, 10:37 AM

Only 3 days until i find out. This little project will be cool. I also am putting in a transmission cooler thermostat aswell. I will help to warm up the at fluid in those colder days in minneapolis.

Landshark · #21 03-03-2004, 11:01 AM

Quote:

Originally posted by huck369
(been preaching the 4.11 Auto swap for years)

preach on, brother Huck!

what is involved? i'd really appreciate some more info on this.

huck369 · #22 03-03-2004, 11:13 AM

Quote:

Originally posted by Landshark

preach on, brother Huck!

what is involved? i'd really appreciate some more info on this.

PMed ya

GreenMarine · #23 03-03-2004, 11:23 AM

Quote:

Originally posted by SVX-FF
Only 3 days until i find out. This little project will be cool. I also am putting in a transmission cooler thermostat aswell. I will help to warm up the at fluid in those colder days in minneapolis.

Cool be sure to let us know about the driving impressions after it's done !!!!

oab_au · #24 03-03-2004, 06:08 PM

Quote:

Originally posted by alacrity024

well, the 5MT conversion could theorerically be slower if you used taller final drives.. it could also be quicker if you used 4.44's..... the real "difference" between the 4EAT and 5MT (besides the obvious mechanical advantage of fewer clutches and moving parts in an MT) is WEIGHT.. so two SVX'i, one with a 4EAT and one with w/5MT, both with identical final drives and a guy who knows how to work a clutch...

i assume the 5MT will outrun the 4EAT by a hair based on weight savings alone.

and it's my guess that the 4EAT will grenade well before the 5MT, giving the MT driver a hefty advantage on the track

-adam

Adam if they are both running a 4.11:1 diff ratio, the auto will blow the manual into the weeds. You are forgeting the punch off the line that the auto has all over the manual.

How hard can you punch a manual off the line?, dial up 2000 rpm and drop the clutch

Don't think the clutch would last, even if the gearbox did.

The thing that puts the auto ahead is the torque converter. A manual is stuck with what ever the first gear ratio is, the auto's first gear ratio continually varies, from a low of 22.9:1 to a high of 11.44:1 due to the 2:1 ratio that the torque converter can go to under load. And you can punch it off the line as hard as you want.

I reckon the 5MT will blow before the auto, contary to popular opinion the auto is one strong box

Harvey.

Subafreak · #25 03-03-2004, 06:20 PM

I'll agree with that. It's tricky to launch to 5speed and I ussually take it easy on my 5 speed when I take off anyway. I willing to bet Adams car will take mine off the line and depending on how well the shifting goes for both cars maybe even take me overall. I think a trip to the strip in in order.

UberRoo · #26 03-03-2004, 10:45 PM

Look at all the guys with the V8 muscle cars at the drag strip. They all use automatic transmissions. They're just fast, plain and simple. Also, autos are much easier on parts - axles, gears, and other things just don't endure the forces created by dumping a clutch.

I would never have guessed the 4EAT could be a strong tranny, but apparently it's true:

Available from Easy Street Motorsports.
* Upgraded Syncro 5 speeds up to 500hp
* Full Dog-Box 5 speeds up to 740hp
* Full race 4 speed automatics 800hp+

(Their web site seems to be down.)

huck369 · #27 03-04-2004, 05:24 AM

I disagree...
Manuals are faster, if driven well, they have less drivetrain loss (so more HP gets to the ground)and are lighter.

People that Bracket race prefer Auto trannys, not because they're faster, but because they are more consistant , and bracket racing you need to be very consistant to do well,...so no, manuals aren't the best thing for bracket racing, but this dosen't mean it's because they're slower.

As for the reliability issue, I thing physically the manual is probably tougher than an automatic, BUT you can induce a LOT more stress on a manual tranny be shock loading the gearsets when dumping the clutch, which is something that the auto is insulated from, so if you're very abusive to your tranny, an auto will probably hold up longer....but if you treat them right, you'll never have to worry about a manual, other than replaceing the clutch now and then.

My thoughts on the mater.

#28 03-04-2004, 08:13 AM

this turned into a really good thread..

harvey- good call on the whole torque converter bit.. i hadn't thought of that. i guess automatics are certianly much less complicated to "launch" it's kind of like point-and-click.. on a full road course racetrack or rally course, i kind of think a manual transmission would be in order, simly to better utilize engine braking and due to significantly reduced 'drivetrain loss" as huck pointed out. but i've never had a car on a racetrack, so i could be wrong.

subafreak- yes, a trip to the strip (rhymes) is ABSOLUTELY in order

i'd like to get a '92 w/stock transmission internals in the lane next to me and see how bad i would've whupped my own ass

-adam

BordeauxComet · #29 03-04-2004, 01:05 PM

Does anyone know what the top speed is now with the 4.11?
This swap sounds really tempting. My transmission if fine, so it's not like I'd need to replace everything. How much do you think it would cost just to get the new final gear (and any other parts it requires)? My SVX is FWD also, so that should make things simpler/cheaper.
-Nathan

huck369 · #30 03-04-2004, 01:30 PM

Quote:

Originally posted by BordeauxComet
Does anyone know what the top speed is now with the 4.11?
This swap sounds really tempting. My transmission if fine, so it's not like I'd need to replace everything. How much do you think it would cost just to get the new final gear (and any other parts it requires)? My SVX is FWD also, so that should make things simpler/cheaper.
-Nathan

Nathan,
I'm not sure how the speed is governed on them, if it is from the Vehicle Speed Sensor, or off the RPM, if it's the VSS, then I'd say it'll still go the 139 (or what ever the governed speed is), and get to it quicker, with the stock gearing, it could therorecticaly go 190 mph, but even unrestricked could only reach 156, partly because the high gears take more HP to use, the lower gears will be able to make better use of the available HP...and I wouldn't doubt that the lower gears would reach a HIGHER mph (in a unrestrickted car) due to this.