Now that I have my Air/Fuel gauge working I need to be sure what kind of reading I am suppose to be getting. I am running around 17PSI of boost and at full throttle and max boost I get a reading of 14.5:1. I thought you were suppose to be in the 13.2:1 to 12.5:1 from what I have read on the board here. Is that correct?

If I am running leaner than I should be my understanding is that I could get an adjustable fuel pressure regulator. If this is so then I would like to know where to get a quality regulator at a good price.

Thanks

 

First your gauge may or may not be correct. Only way to find out is to compare it to a wide band lambda. You can do that on a dyno and get a full read through the range.

I compared a gauge on my 94 3.6 turbo to a wide band and I was off by '1'. Lucky for me my gauge was showing lean so I added fuel not the other way around. If you think 944's are expensive to rebuild you should try one of those.

Bottom line, understand what you are really looking at. It's easy to go down the wrong path.

Some of the stand alone systems will allow you to calibrate your O2 sensor to a known wide band.

Alan

 

While the Adjustable FPR can cure some lean-ness, there's a couple other forces acting on that ratio... the chips and the injectors are the most important. Though, it seems that an adjustable FPR can certainly be a helpful participant.

 

Be careful, that's very lean. You should be at 12.5:1 under boost, and 14.7:1 while cruising at light throttle openings/low load. Assume your a/f gauge is correct until proven otherwise. Your APE chips should be providing richer conditions than what you're seeing. My afpr is from Huntley Racing, and I've been happy with it. Make sure you get a fuel pressure gauge for the end of your rail, to help in adjusting fuel pressure.

 

Ok I will try to find a place with a dino local but in the mean time I am wondering about the FPR. If I was to get an adjustable one and turn it up so my A/F mixture is good at WOT will the DME be able to compensate at the other levels? Oh also am I going to have trouble making full boost on a dino with my setup like I hear people with more mods having?

Thanks

 

The narrow band gauges that are sold for consumer use are not suitable for tuning purposes.

I know someone who was helping another guy tune his turbo car. The A/F gauge read rich, but when they hooked up the wide-band, they found it was dangerously lean (near melt-down territory).