Boosted Performance round 2 list

blackonorange

If we are running rich , could we go to the next size spring?

jwick

You can go up if you want. The amount of boost doesn't effect the tune. The ecu will calculate fuel based on air flow in open loop.

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

blackonorange

So upping boost won't lean it out some?

jwick

It shouldn't. In open loop it adds fuel based on air flow and the parameters set in the tune. Easy enough to try it and log it.

I will say this is my understanding and I'm not a tuner. All that being said my tuner gave me a WG spring map and boost controller map.

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

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

elperuano

Turning up boost on a base map? Woooowwwww....

blackonorange

^ I'm not sure how it all works and it only hits like 6psi on the yellow spring. I'm leaving it. Car is a lot of fun tho.

jwick

I only made 6.7lbs on the yellow spring. Just remember the springs have a tolerance of +\-2lbs. So if you step up to the black spring you could be at 10lbs. I wouldn't recommend running that much boost with out a custom tune for your exact setup

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

TopgunZ

I think the tolerances are from hot to cold. This is why you need a boost controller. It will compensate for the softness of the springs after they heat up. I have black springs in and I seen 11.7 lbs of boost my first pull and it dropped to and stabalized at 9.1 lbs after my 4th pull.

Nobody should run off of wg spring alone.

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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

Mitco39

Just did a bit of math. When the fuel pressure drops from ~50lbs down to ~36lbs you are now only flowing at about 85 percent of capacity. So as a result your injectors have to stay open longer just to get the same amount of fuel.

__________________
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's not a lot of headroom when you add running 10lbs of boost

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