I have a d16z6 and the greddy turbo kit ( 8psi) i am using the greddy fcu that came with the kit. I have a shogun power tuner so i can adjust fuel and timing. I have heard the greddy fcu runs a little rich on the bottom end and a little lean at the top is this true? can any body suggest some starting points for tuning the fuel curves. rpm ranges and percentages of fuel to take away or add would be ideal?

 

This is interesting, I never heard of the FMU running rich on lowend and lean on topend. Hope someone knows.

 

Hey, I'm in atlanta and I'm using the Fcu too. I've got the same setup except I'm running the Apex kit. I agree that the fcu goes rich low and lean high. I don't really have any hard evidence but what my A/F gauge says and we all know that's not too accurate.

You really have to get on a dyno with a wide band to tell what's going on for real. Don't even waste your time with the basic gauges. I run the A/F because it's built in to my turbo timer and it's good basically because it can tell you if you are extremely lean. That's about all it's good for though.

Are you using the stock injectors? I am and I've found that all is going very well with a nonintercooled 6psi. The plugs are clean and not over heated nor are they reading rich. I guess greddy did their homework.

Plug reading is the best way to tell what is going on in the motor with out a wideband O2. Take a hard run and don't let the engine idle or cool down before you shut it off. Pull the plugs and take a look. That's cold hard evidence that can't be disputed or theorized.

Hope this helps. Oh, and to the post above mine, he said FCU not FMU.

To answer your question more specifically, don't do anything without getting on a dyno jet. Seriously, it's a freaking shot in the dark. If it's obvious you are one way or the other you can try to correct it but if you aren't having serious problems then wait to tune it on the rollers.


[Modified by glagola1, 5:43 AM 9/24/2002]