Boosted Performance round 2 list

Mitco39

Just be carful. The fueling system on this car is only good for around 550 (or as I found out about 11psi). Soon as your running more than that your just getting to much air into the cylinders for our stock fuel system.

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2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

jwick

That based on fuel pressure drop?

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

Mitco39

That based on my AFRs leaning out on the dyno. The Fuel pressure numbers just confirm it. That being said I been sitting right at 11PSI with 0 issues. I am running the 10PSI spring with the EVC6 boost controller pushing it up to 11.

__________________
2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html

jwick

So you never identified why it was leaning out, just an indicator on the dyno? I assume that's about when you get into needing a return system to elimiate the fuel pressure drop issue. Now I really can't wait to get my CJM fuel pressure adapter and pressure sender for my multi-gauge. I'm running 10lbs now so it's got to be getting close for me too.

Are you running the fuel pump relay?

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

Mitco39

It was leaning out because of the supply system our cars have. At the time I was still running the stock wiring to the fuel pump, but I have since ran my own 16 gauge ( I believe) wiring right to the fuel pump which has helped.

I personally believe that inadequate fueling is responsible for most of the boosted engine failures, it only takes one quick drop in fuel pressure to lean out an engine enough to go boom.

Right now my car is staying at 10lbs until the fueling system gets upgraded, I am very interested in what FI has coming down the pipes. Everyone said it was fine but seeing your fuel pressure drop 10PSI at wot, then creep down to 14PSi at the higher rpms was a bit unsettling. Not only does this make your fueling system struggle to keep up, your now spraying your injectors much longer to just get that same amount of fuel in which just has to be creating a inefficient burn.

__________________
2007 Chevy Duramax - EFILive Tuned By Me
2010 40th W/ Nav - Boosted Performance - UpRev Tuned By Me
The Mrs. Ride -2012 335XI N55 BMW - Cobb Tuned By Me, Built by her
My Build --> http://www.the370z.com/members-370z-...39s-build.html