Rogue_Ant

That is an ugly tune... I would correct that ASAP.

minho78

Drew turn the pressure down a little bit and see if it helps,. You are putting to much fuel and that means carbon build up.

Rogue_Ant

No - do not turn down the FP. You are already way to lean at WOT; most likely knocking as well.

You are too rich cruising, and not rich enough in boost... Need to get that thing tuned, or re-chipped.

minho78

Uhmm after reading it again you are right. Lean up top. Rogue by the way when are you going to start messing up with MAF with the ostritch.

lart951

or get a piggyback

Rogue_Ant

Who says I haven't been...

951_RS

Yeah guys I'd hardly call what I have a tune! Up until yesterday I had no idea how rich I was though. I'll be doing -3 then -6% (compared to what I'm running now anyways) fuel through the FQS switch and I'll see if that doesn't help the low/middle end of the rpm. What afr should I be looking for at cruising?
Also I have a set of injectors on the way and hopefully a maf soon to fix all this, at which time I'll seafoam the car to help get rid of some of the build up.

toddk911

You can not "tune" with the FQS. That adds/takes out fuel across the rev range. You need a new chip or a piggy back that can adjust fuel in specific rev ranges.

So if you take 6% of fuel out you will be 6% leaner across the board.

If anything, go +6% so the upper revs are safe and just be richer in the mid. You will not wash out the cylinders unless you are REALLY rich; i.e. 9:1. And before you get to being so rich as to wach out the cylinder, the car would barely run from being so rich. If it is not bucking and stumbling/bogging, then it is not ultra rich.

lart951

I like how the 928 guys have a Frequent Questions sticky thread for visitors and new members, this is basic stuff that people should know in order to avoid damage to their cars.

951_RS

Well, I'm not attempting to tune the car with the fqs... I will be reducing the fuel trim because its too rich down low due to increased FP and the +3% from the fqs. The top end is lean because the fuel injectors are maxed out. I'm not concerned and it's not like I think it's just fine. This is to get to work and back until my maf and injectors come in... I rarely see lower than 12s and I don't rev high enough to reach 13's so for now it's fine.
Also, if requested fuel is not being met, turning down requested figl does not neccesarily mean I'll run even leaner.
If I request 103% fuel and receive 95% it's the same as requesting 100% fuel and receiving 95% as the injectors are the limiting factor not the fqs settings. Is there even a +6% fqs setting? Thought there was only -3 and -6, maybe I have that backwards

toddk911

stock 0 0
1 +3.1% 0
2 -3.1% 0
3 +6.3% 0
4 0 -2.72°
5 +3.1% -2.72°
6 -3.1% -2.72°
7 +6.3% -2.72°

400hp944

minho78 -

I have a Split Second fuel controller for $100 shipped if you are interested. It was the only way I could get my car tuned when I had the Autothority MAF on it.

951_RS

Thanks, and I don't want you to think I was saying you're wrong earlier, just that it might work the way I mentioned it. Perhaps not though as I'd have to actually test it to find out. Do you think the +6% would help to richen the top end even if the injectors are maxed? Guess I'll try that first before I risk going leaner

Rogue_Ant

If you are out of injector, you can try raising fuel pressure...

951_RS

Yeah, I thought about that. I was reading that you raised your fuel pressure pretty high when you were on stock injectors. I do have 75#'s on the way though and I'm purchasing a maf today so I'll just wait for that stuff instead of being silly with the stock injectors.