The Subaru SVX World Network

The Subaru SVX World Network (https://www.subaru-svx.net/forum/index.php)

- Proven Engine Enhancements (https://www.subaru-svx.net/forum/forumdisplay.php?f=62)

- - Intake Idea (https://www.subaru-svx.net/forum/showthread.php?t=31156)

Laugh if you must! I'm a newbie in this world of SVX but the intake of the SVX has been troubling me. All this talk about maf voltages maxing out, timing being retarded and high rpm power being robbed has got me thinking.

I've noticed that on other Subarus (My two XT6s as well as my RX Turbo [rest its soul]) has power dropping off at 5600rpm or so. This was always the case until the air flow was straightened out or opened up through intake/exhaust modifications. Here's one example of how my SVX, XT6 and RX turbo changes their hp slope at 5600rpm.

http://home.comcast.net/~thomasck/5600rpmDrops.jpg

I have no scientific data to back this up but I really do not like that intake design. It does not seem to support flow at high rpm. As a matter of fact it seems it may hinder flow by having the air come crashing on the sides of the 'torque box' attached to the dual throttle bodies.

I had a chance to stop by Vertex Industries (Now Verocious Motorsports) which is within 10 minutes of my house [Verocious Motorsports.com]. This is the same place I get all my piping and silicone hoses from. I talked to a guy name Tim there and explained the type of intake I needed. He stated he needed the 'engineer' to be there to measure things out to get things perfect. I believe the engineer's name is 'Tom'. He may be there tomorrow or sometime next week so I'll talk to him then. I definitely want to move forward with this and test it to see how it goes. Something inside me tells me it will make a BIG difference in mid and/or high range. I dunno, pretend I'm an idiot. Here's a rough (pre-school) scetch. Yeah, laugh away!

http://home.comcast.net/~thomasck/mi...IntakeIdea.JPG

Chike and (Ohh....Supercharger guy....:( Sorry...I can't get the name out) knows about this as I've talked briefly to them about it today. I'm going to go ahead with this to see what it does. I'll be sure welding is in place for the vacuum hoses.

I'm fully aware that this may be an out-dated, already tried idea that sucks. I may have over looked the thread. Thanks for any input though.

Thoughts....Ideas!?!

I'd actually like to see two completely seperate intakes, two maf's, and two filters....

I'm sure that someone with electronics background could figure out the wiring issue, and ECU implications....

Quote:

Originally Posted by Myxalplyx

Laugh if you must! I'm a newbie in this world of SVX but the intake of the SVX has been troubling me. All this talk about maf voltages maxing out, timing being retarded and high rpm power being robbed has got me thinking.

I've noticed that on other Subarus (My two XT6s as well as my RX Turbo [rest its sould]) has power dropping off at 5600rpm or so. This was always the case until the air flow was straightened out or opened up through intake/exhaust modifications. Here's one example of the my SVX, XT6 and RX turbo chanes a little at 5600rpm.

http://home.comcast.net/~thomasck/5600rpmDrops.jpg

I have no scientific data to back this up but I really do not like that intake design. It does not seem to support flow at high rpm. As a matter of fact it seems it may hinder flow by having the air come crashing on the sides of the 'torque box' attached to the dual throttle bodies.

I had a chance to stop by Vertex Industries (Now Verocious Motorsports) which is within 10 minutes of my house [Verocious Motorsports.com]. This is the same place I get all my piping and silicone hoses from. I talked to a guy name Tim there and explained the type of intake I needed. He stated he needed the 'engineer' to be there to measure things out to get things perfect. I believe the engineer's name is 'Tom'. He may be there tomorrow or sometime next week so I'll talk to him then. I definitely want to move forward with this and test it to see how it goes. Something inside me tells me it will make a BIG difference in mid and/or high range. I dunno, pretend I'm an idiot. Here's a rough (pre-school) scetch. Yeah, laugh away!

http://home.comcast.net/~thomasck/mi...IntakeIdea.JPG

Chike and (Ohh....Supercharger guy..****(SVXFiles..btw)****..:( Sorry...I can't get the name out) knows about this as I've talked briefly to them about it today. I'm going to go ahead with this to see what it does. I'll be sure welding is in place for the vacuum hoses.

I'm fully aware that this may be an out-dated, already tried idea that sucks. I may have over looked the thread. Thanks for any input though.

Thoughts....Ideas!?!

the air filter needs to be in the fender, just fyi. itll do **** in the engine compartment (aka..hot air intake)

My SVX came with a pipe extention that went clear thru the airbox into the fender with a cone filter. Looks stock but open the airbox and its just got a hose from the inner part of the upper intake thru a hole in the bottom of the box.

Just speculation, but I think having the two hoses un-equal length would cause problems... response time, velocity, etc. would be different per bank. like the difference in midrange TQ between a CAI and a short ram.

Quote:

Originally Posted by Myxalplyx

Chike and (Ohh....Supercharger guy....:( Sorry...I can't get the name out) knows about this as I've talked briefly to them about it today. I'm going to go ahead with this to see what it does. I'll be sure welding is in place for the vacuum hoses.

The S/C guy is Tom (Svxfiles). He definitely enjoyed speaking with you Kevin.

As long as the piping is smooth I'm sure you'll see some gains. I would also second Mike's recommendation. If possible, have the cone filter reside in the fender well.

-Chike

I second Huck's suggestion, and got confused with xturboexpress's comment about the unequal intake piping... What about if Myxalplyx's idea was realized but to get the effect of Huck's suggestion (two pipes and two mafs) we can install 1 larger diameter MAF having a higher velocity a little inferior but near the twin system. I once saw on ebay a 300Z MAF but having an increased diameter than stock :cool: ...

Here's an EG33 with a "dual intake" its nestled in a WRX chasis with a twin turbo set up. But if you look you can see the dual MAF set up. http://www32.homepage.villanova.edu/...-wrx%20(1).jpg

Becuase the pipes are hooked right up to the TB's and of different lengths, one is going to suck air in easier. Just like if you had two different lengthed straws. With only one filter you could say that ~60% of the air the filter takes in would go to one side and 40% to the other. Maybe that drastic, maybe not. Just pointing out that it may be a weakpoint.

Quote:

Originally Posted by xturboexpress

about which setup you are talking about? the one in the pic gest24 suggested? :confused:

Quote:

Originally Posted by gest24

Here's an EG33 with a "dual intake" its nestled in a WRX chasis with a twin turbo set up. But if you look you can see the dual MAF set up. http://www32.homepage.villanova.edu/...-wrx%20(1).jpg

I don't believe that this engine has run - at least to date, that is....
-Bill

Quote:

Originally Posted by gest24

Here's an EG33 with a "dual intake" its nestled in a WRX chasis with a twin turbo set up. But if you look you can see the dual MAF set up. http://www32.homepage.villanova.edu/...-wrx%20(1).jpg

sorry but definetly no MAF's on that, its an EMS driven system using 3 bar map sensors... it probably hasnt driven becuase they blew all their money on 200 dollar a peice clamps.....
phil

Quote:

Originally Posted by xturboexpress

Just speculation, but I think having the two hoses un-equal length would cause problems... response time, velocity, etc. would be different per bank.

Our stock airbox at the throttle is allready un-equal length.
The air has to travel farther to get to the drivers side throttle body.

I have allways liked the idea of a twin air filter, twin runner intake for the SVX, as discribed by Terry McLane, years ago, and now that we know our MAFs max out at 250 hp, or so, this mod might pay off on cammed, or big block 3.3+ engines.

With 1/2 as much air travelling through our stock MAF, it would not be any where near maxed out, so could we just use some form of voltage transformer to double the reading so that the ECU uses the stock, or modified timing maps?

Perhaps a LAN chip, one stock MAF, and a twin intake, twin filter raises the NA, or SC, or NOX engine limits, for the intake components to 500 hp now?!

Now, if some smart guy, Harvey, LAN, Mychailo, Mark(5), can tell us which MAF to use, and how to wire it, all we have to do then is plumb it!

Hmmm 2 intakes, 2 air filters, 1 maf (the stock one) wired to double the signal....sounds very do-able to me......anyone know what it would take to double the MAF signal?

Maybe a 741 OP amp or some other type of amplifier. But a 741 mite not be the best choice.

Quote:

Originally Posted by svxfiles

Our stock airbox at the throttle is allready un-equal length.
The air has to travel farther to get to the drivers side throttle body.

With the stock intake, there is a area before the TB's that equalizes the volume between the two, I thought? There is one box with two holes in it for the TB's and one for the intake piping back to the airbox. The sketch above shows two pipes going directly into each TB, which is why I pointed out the length issue.

Again, it might not matter at all, but as he stated hes looking for maximum performance, just a thought.

If after the TB the air paths cross again, like inside the manifold, everything I've said makes no difference, just thought about that. I am saying all this on the basis that after the air passes the TB it does not intersect again with air passing thru the other TB, which is how I thought it was. School me =)