SVX Network Forums Live Chat! SVX or Subaru Links Old Lockers Photo Post How-To Documents Message Archive SVX Shop Search |
IRC users: |
#1
|
||||
|
||||
Intake Idea
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. 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! 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!?!
__________________
Kevin Thomas 1997 2.2ltr Subaru Impreza Outback Sport Wagon (AWD/Auto) 13.03@100mph 1989 2.7ltr Subaru XT6 (AWD/Auto) 15.912@85.93mph 1996 3.3ltr SVX (AWD/Auto) 15.070@91.38mph ***R.I.P*** 2010 RAV4 AWD Sport (13.717 @ 99.19mph ) 2015 Honda Fit LX CVT (15.2 @ 90mph) Last edited by Myxalplyx; 01-27-2006 at 06:25 AM. |
#2
|
||||
|
||||
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....
__________________
Huck Subaru Ambassador 92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD 88 XT6 AWD 5-Speed "Bride of FrankenWedge" 15 Impreza Premium Sedan 15 Crosstrek XV 5-Speed My 5-Speed "How-To" Write-up 1976 Pontiac Firebird Formula Current Count of Subaru's Owned.... "70" |
#3
|
||||
|
||||
Quote:
__________________
1991 SVX L JDM |
#4
|
|||
|
|||
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. |
#5
|
||||
|
||||
Quote:
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
__________________
"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#6
|
||||
|
||||
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 ...
__________________
Danny 1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon) 1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration 2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection. |
#7
|
||||
|
||||
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.
__________________
1992 SVX LS-L: Now TomStock Stage 3... 6MT, R180 Rear, Tomstock Short Shifter and hard rubber mount, Group N Motor and Tranny Mount, Stage 2V6 Chip, Z32 MAF, Stage 3 CAI, Stebro, Intake Cams, 17" STi BBS Powder Coated Black, Bridgestone Potenza RE070, and Koni inserts w/Mychailo's Springs! Sand Diego SCCA Solo 2 #308 RIP 84 VW Scirocco 02 WRX 88 XT6(regret the day I left her behind) socaleuro.com They like the flat 6... Check My New Homepage.. |
#8
|
|||
|
|||
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.
|
#9
|
||||
|
||||
Quote:
__________________
Danny 1994 Silver SVX in hybernation, awaiting for the monsterous awakening (Lebanon) 1967 Mercedes-Benz 250SL Euro Specs, Hard/Softtop, White/Red. Under Complete Restoration 2013 Mercedes-Benz SL350 Euro Specs, White/Red. Mint... Another step into SL Collection. |
#10
|
||||
|
||||
Quote:
I don't believe that this engine has run - at least to date, that is.... -Bill
__________________
Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#11
|
||||
|
||||
Quote:
phil
__________________
~Phil Teal 1992 Subaru SVX Turbo - Sold in May 2011 to peace-frog. |
#12
|
||||
|
||||
Quote:
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!
__________________
www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link Last edited by svxfiles; 01-27-2006 at 07:53 AM. |
#13
|
||||
|
||||
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?
__________________
Huck Subaru Ambassador 92 SVX LS-Tour Magnaflow Exhaust, 5-Spd-AWD 88 XT6 AWD 5-Speed "Bride of FrankenWedge" 15 Impreza Premium Sedan 15 Crosstrek XV 5-Speed My 5-Speed "How-To" Write-up 1976 Pontiac Firebird Formula Current Count of Subaru's Owned.... "70" |
#14
|
||||
|
||||
Maybe a 741 OP amp or some other type of amplifier. But a 741 mite not be the best choice.
__________________
2005 Legacy GT 2002 WRX VF22, Pinks, big TMIC and turbo back 128,*** miles My WRX's Cardomain Page |
#15
|
|||
|
|||
Quote:
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 =) |
|
|