dyno today here are numbers..great fuel tuning info!

[Vector]

did you watch the FP gauge on the dyno...

what fuel pump you using..

i agree with steve and funks to you should be way crazy rich... it should not just go from 18% to 5% with the safc thats not right imo

[dognutz]

Quote: Originally Posted by Steven Burgess

Hey Mike, see if you can borrow someone elses fuel pressure guage just to make sure yours is reading right. I know it's un-likely to be bad, but it's something you could eliminate pretty easy.

Steve B.

i will buy another one this week.. i have a water filled one.. i will get other though to make sure..

[dognutz]

Quote: Originally Posted by Vector

did you watch the FP gauge on the dyno...

what fuel pump you using..

i agree with steve and funks to you should be way crazy rich... it should not just go from 18% to 5% with the safc thats not right imo

no sir i didn't i should have.. i will get another gauge to make sure i have it sit the way i am telling you it is.. this one could be wear or broke i took it of my 1gen race car. 255 walboro..

[dognutz]

should i be happy with these numbers.. i like the tq.. it is werd that i am only pulling 5% fuel on top..

[Steven Burgess]

Hey Mike, I just compared your settings at 21psi to your 28psi settings and something is wrong here.

At 21psi you were pulling out less fuel between 4200rpm and 5800rpm than you are at 28psi.

21psi of boost 4200rpm -19%
4800rpm -18%
5400rpm -15%
5800rpm -12%
6200rpm -9%

28psi of boost 4200rpm -19%
4800rpm -21%
5400rpm -18%
5800rpm -8%
6200rpm -5%

You would think at 4800rpm and 5400rpm at 28psi, you would have to pull less fuel than at 21 psi, but you are pulling more fuel.

Steve B.

[dognutz]

Quote: Originally Posted by Steven Burgess

Hey Mike, I just compared your settings at 21psi to your 28psi settings and something is wrong here.

At 21psi you were pulling out less fuel between 4200rpm and 5800rpm than you are at 28psi.

21psi of boost 4200rpm -19%
4800rpm -18%
5400rpm -15%
5800rpm -12%
6200rpm -9%

28psi of boost 4200rpm -19%
4800rpm -21%
5400rpm -18%
5800rpm -8%
6200rpm -5%

You would thing at 4800rpm and 5400rpm at 28psi, you would have to pull less fuel than at 21 psi, but you are pulling more fuel.

Steve B.

i don't know all i can say is fuel gauge migt be missed up.. i will get a new one and see what is says.. it still don't make sence.. and the dyno wide band was reading it better then aem uego.. i don't know i am at a loss.. as when my heat is on in car the aem uego will read different. why is that..

[Vector]

Quote: Originally Posted by dognutz

i don't know all i can say is fuel gauge migt be missed up.. i will get a new one and see what is says.. it still don't make sence.. and the dyno wide band was reading it better then aem uego.. i don't know i am at a loss.. as when my heat is on in car the aem uego will read different. why is that..

ground/ voltage problem maybe

[dasmopar]

We have seen a sniffer read leaner than it should have. It was checked against a LM1 and was lean.

[funks]

Stupid question here dognutz..

Who installed your Fuel Pump for you (the one inside the canister, inside the fuel tank)? Are you sure they stuck a walbro 255 lph on there? or just used the stock one..

If you are still using the stock fuel pump and the injector duty goes up, your fuel pressure will drop and you'll run into the problem you are getting now.

G

[Vector]

Quote: Originally Posted by funks

Stupid question here dognutz..

Who installed your Fuel Pump for you (the one inside the canister, inside the fuel tank)? Are you sure they stuck a walbro 255 lph on there? or just used the stock one..

If you are still using the stock fuel pump and the injector duty goes up, your fuel pressure will drop and you'll run into the problem you are getting now.

G

this would be very easy to tell if watching a FP gauge as pressure would drop fast at top end

[dognutz]

Quote: Originally Posted by funks

Stupid question here dognutz..

Who installed your Fuel Pump for you (the one inside the canister, inside the fuel tank)? Are you sure they stuck a walbro 255 lph on there? or just used the stock one..

If you are still using the stock fuel pump and the injector duty goes up, your fuel pressure will drop and you'll run into the problem you are getting now.

G

i had eld performance install the pump.. as i hope thay put the 255 pump in thay better of had.. i will find out tomarow.. that could be a problem.. hmm when i did adjust the persure reg the gauge said 43 at one time with vac on at idle i drove it and come to check it again and now it said 41 psi.. that could be the stock pump you think.

[Steven Burgess]

Quote: Originally Posted by dognutz

i had eld performance install the pump.. as i hope thay put the 255 pump in thay better of had.. i will find out tomarow.. that could be a problem.. hmm when i did adjust the persure reg the gauge said 43 at one time with vac on at idle i drove it and come to check it again and now it said 41 psi.. that could be the stock pump you think.

Before my car warms up, the fuel pressure reads 2 psi more. After it runs for a few minutes, it drops down.

Steve B.

[dognutz]

okay what is stock fuel pump number.. this is the fuel pump in my hand right now that came out of car it says walbro p/n 05290251aa next set of numbers f20000142 next set 09404-2 next set pat 4500270.. this is stock pump right..

[dognutz]

what r some stage2 computer and 50 or 60 trim turbo fuel persure at vac on vac off. help me get over 400 hp.. thanks again for the help i am getting now..

[yellowRS]

I think you guys are right about the pump. You need to watch the FP to see if it is dropping. I am running a static FP of 45 and had plenty of fuel to make 450 WHP.