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#16
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Back from Dead
Bringing this ancient thread back up. Noticed that stock pressure is 36psi and people have been bumping them up to 43psi.
Let us say that your air fuel ratio is 13.6:1 and you want to bring it down to 12.8:1 for WOT horsepower purposes (Just because in your head for some reason you think it will make more power in the 12.5:1 to 13.0:1 range being naturally aspirated). Just a guess but how much of a pressure increase will you need to make this happen from the stock fuel pressure of 36psi? I am curious as to if there is a formula for this (Ex: +2psi fuel pressure increase = -.4:1 air/fuel ratio drop or richer fuel). If not, then just will have to do it by trial and error. I wish I could do a cool graph like Chike put up. Thanks for any input! Also, is there a how-to for installation of a fuel pressure regulator here somewhere? I have a fpr regulator and gauge from my Subaru RX turbo in my garage. May as well put them to use. BTW: Browsing the internet I ran into an interesting before and after air/fuel ratio tuning article on a Honda. http://www.turbomagazine.com/tech/02...ing/index.html I am not saying we can expect similar gains but it does show what proper air/fuel ratio tuning is capable of. Wish an SAFC could be used on an SVX.
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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; 10-29-2007 at 04:47 AM. |
#17
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Chuck D. 1992 Subaru SVX LS-L - Heavily modded turbo 2002 Subaru Impreza WRX- Turboxs stg3 & Susp. Mods |
#18
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However, I plan on doing the same thing with the SVX but need to use the SAFC to trim fuel down during neutral and light throttle conditions. This worked well on my Outback Sport so I figured why not try it on this. There are two important setup info about the SAFC that I need to find out. I may need to post this in an SAFC thread. What is the Sensor Calc and Sensor Number settings to use the SAFC on an SVX? Does anyone know? I only think I need to adjust the fuel. I will know after tomorrow.
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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; 10-29-2007 at 08:45 PM. |
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