speed density rich on w.o.t?

[saleen9973]

Hey guys i just picked up a 87 gt. My mods are 70mm tb, k&n filter, bbk shorties, off road h-pipe, flows that are dumped, underdrive pullies, electic fan, 3.73 gears, lakewood 50/50, and 70/30, eiback drag launch kit w/ air bag, bbk upper and lower controll arms, steda tri-ax, all on a manual tranny, and a 255 walbro fuel pump. My problem is that at wide open throttle black smoke comes out the exhaust. Also if i am just going easy and doing normal driving it seems like the car loads up. What are my options? I have a mass air computer, harness, and meter just waiting to go in but i am not ready yet because i feel the car does not need it yet or untill i put heads and a cam in it. Is the fuel pump too much for it? Should i try a adjustable regulator?

 

[Daggar]

An adjustable regulator would be a good addition. You may also need to check the condition of your 02 sensors. The computer doesn't take readings and make adjustments to the AFR at WOT however, it does take information from idle and part power settings and extrapolate additions or subtractions to the WOT fuel table as it goes.

In other words: If while cruising down the road, your car runs 3% rich (average) across the power range then the EEC will subtract 3% from the injector pulse at WOT.

Are you still running the stock 19# injectors? If so, check the 02s. If you're running 24s, replace them with 19s or you need to do some either electronic or mechanical tuning wizardry in order to bring things back in line (I've tuned SD with 24s. It's a bit of a PITA).

If you're running 19s and go the route of an adjustable FPR then you'll need to make changes very slowly and run the car (drive) for a good while until it's where it needs to be. All of this will be a near impossible task unless you have the means to read/record your air fuel ratio or EGT.

 

[saleen9973]

Yes i still have the 19# injectors in the car. Funny thing i just sold my wide band
o2 about 4 months ago. I didnt think i would be getting another stang so soon. I will try the adjustable regulator.