Tuning for FAST 102 Manifold and matching NW throttle body?

[CactusG8]

I got it to idle fairly smoothly by increasing the etc to 7195. I also increased the idle air some. I put the idle spark at 21 which used to be 18 and matched the minimum spark in park, gear, and coast down.

I had a ported stock manifold and ported stock throttle body. It was tuned in the low 12s for E10.

My question is until I get on the dyno how much leaner is it approximately running with this combo?

it seems to be running leaner as I know a lot more airflow is entering the engine.

So with those with experience with this change in combo how much more frequency should I add to the maf curve?

I was thinking about 4 percent or so until I hit the dyno.

Thanks

[GHuggins]

How much more have you had to add for idle and cuise fueling just going off of O2 fuel trim corrections? NW's typically flow the best of the 102's. I personally like to use 7900 for the NW's 102 etc scaler, but that's me... If it's a fast then the lower number will work fine or even if you had to install the NW in reverse or upside down position, you can use a lower number. Can't explain it, just what I've seen... Since it's just a TB and intake you should be able to adjust the entire MAF curve roughly whatever you have to for idle and cruise fueling. Even go a touch more to be safe by a couple of percent. Every engine and setup is different so I don't think anyone will be able to give an exact amount to increase by. BUT this method should get you close.

Hope this helps you.

[MikeOD]

I think 7900 is high for the ETC scalar with the NW102.

My car had 5636 for the stock ETC scalar and I had idle dialed in nicely. When I changed to the FAST 102 and NW102, I increased the scalar until I wound up with the same numbers in the airflow final minimum table as before...I wound up at 6387 (which I've read other used as well).

Did you change the tube the MAF sensor is in, or the MAF configuration? If you didn't change that much, I doubt you're running much leaner than you were before...it's just probably able to get a little higher in frequency due to more airflow at higher RPM under load.

I guess if you wanted to be safe you could add 3-4% to the MAF curve to be certain before you get to the dyno...but if anything, the new intake manifold and TB will probably effect the VE table more than the MAF calibration. Are you running MAF only, or with MAF/VE blended?

[CactusG8]

I think 7900 is high for the ETC scalar with the NW102.

My car had 5636 for the stock ETC scalar and I had idle dialed in nicely. When I changed to the FAST 102 and NW102, I increased the scalar until I wound up with the same numbers in the airflow final minimum table as before...I wound up at 6387 (which I've read other used as well).

Did you change the tube the MAF sensor is in, or the MAF configuration? If you didn't change that much, I doubt you're running much leaner than you were before...it's just probably able to get a little higher in frequency due to more airflow at higher RPM under load.

I guess if you wanted to be safe you could add 3-4% to the MAF curve to be certain before you get to the dyno...but if anything, the new intake manifold and TB will probably effect the VE table more than the MAF calibration. Are you running MAF only, or with MAF/VE blended?

[CactusG8]

MAF only. I think that maybe to get the most average wheel horsepower in each gear it has moved up 100 or so. But the dyno will show that. I see some stuff on the net that sais this combo moves the shift points up 300 to 500. I cannot see that. Also I have a darn whistle from this MAF when I accelerate lightly on it. I do not have vacuum leaks. I read on the corvette forum that this is normal with the Nick Williams 102 throttle body. Everything is in the same place. However I notice the diameter of the rotofab tubing is smaller than the throttle body. Roto Fab has a new elbow which is larger in diameter and that is arriving today. I might take it to the track and see which performs better. The NW 102 t.b. or the ported stock one. It will be interesting.

[MikeOD]

My car whistles with the NW102 also...the stock LS3 90mm made a little noise, but the NW102 makes a lot...doesn't bother me though.

[rio95]

In theory, your MAF transfer function should not need to be changed, because you did not change the intake tract. I've seen experienced people argue about this topic before though, so I'll just always check it all to be safe. Even if it is off, it shouldn't be by much at all. The VE should be off by more and will definitely need adjustment.