Ok, I fixed it. I had to richen up the mid setting quite a bit.

These are my MAFT settings:

Base- "7" which is suppose to mean 700cc
Idle- "1" is 5% richer
Mid- "3" is 15% richer
WOT- "B" is 25% leaner


This looks very odd, considering that I was told that I have 450cc injectors.
On this setting at WOT I'm getting between 11.7-12.4 on the wideband.
When I make WOT 20% leaner instead of 25, I run around 11.1-11.6 at WOT. This is all the way through the rpm range.
Any idea's what injectors I have? Is it possible that the previous owner somehow increased the fuel pressure high enough to make it this rich on 450's? I don't have a aftermarket FPR, so I don't know what this guy did to the car.

My boost is set at around 19-20 psi.

If you have a aftermarket fuel pressure regulator, you might want to check your fuel pressure, not all dsm's run at the same fuel pressure. Some injectors work better with a higher fuel pressure setting, around 40, and some like 35. This will cause a major leaning out problem, and you may want to change your fuel filter, don't cost much.

I don't have a aftermarket FPR, and the vaccum line is still connected to the stock one.
I'm thinking that I must have larger injectors then 450's.

Take out the injectors are verify if there 450's. They have blue top and have a marking that has the #'s 450 in the middle.

Sounds like you have serious boost leaks and fpr overrun, fix them and re-tune.

I have zero boost leaks. I tested up to 30psi.

My car has no drivability problems now that I added some fuel to mid.

My boost still fluxuates, and I only pull around 18 in vaccum at idle. Also, when I rev it in P or N it sometimes wants to die.

This is my thread concerning my boost problem. Maybe these are related?
http://www.dsmtuners.com/forums/showthread.php?t=206632

And wouldn't overrunning of the injectors only occure if I tried adding more fuel than the injectors can handle? Right now I'm taking massive amounts of fuel out to get good a/f's.

Maverick3169 said:

And wouldn't overrunning of the injectors only occure if I tried adding more fuel than the injectors can handle? Right now I'm taking massive amounts of fuel out to get good a/f's.

Click to expand...

Not the injectors, I was talking about the Fuel Pressure Regulator. I suspect that you had too change the injector size at low and mid trim in attempting to tune out regulator overrun, happens at idle and part throttle, then having to add more fuel at WOT again when you're running the correct fuel pressure.