anesthes

iTrader: (12)

Are any of you LT1 swapper guys running $EE with a MAF or did you all go speed density?

I've always been a speed density tuner, but on my C4 it honestly runs AMAZING with the MAF. Throttle response and everything is absolutely amazing, no surges or weirdness. But I need to work on the fuel map in the upper RPM's, and looking for some best practices.

-- Joe

Badas.sbird

I am one of the few guys left in my area and still tune both ways but the MAFs work very well in these systems and are easy to tune and maintain. You can even get a blade style LS3/7 maf to work with a large housing to pick up more airflow.

Orr89RocZ

iTrader: (20)

Depends. Some swaps run a different cold air intake and dont put maf back in so i have gone speed density

anesthes

iTrader: (12)

So what are you using to trim fuel? I see the MAF calibration tables, where I can specify how many grams/sec of airflow are at a frequency, but where do I tell it how much fuel to delivery per gram/sec ? (or is that static) ?

I hope the goal here isn't to alter the calibration table to "trick" the code to think it's getting more air then it is. That would be silly.

-- Joe

anesthes

iTrader: (12)

I can understand that on an fbody or anything with forced induction, but the stock airbox on a C4 is about as cold-air as you can get.


-- Joe

Orr89RocZ

iTrader: (20)

I tuned maf tables lol for wot just some kinda of power enrichment.

anesthes

iTrader: (12)

For WOT you have the % AFR adder, but I'd prefer if my log reported the actual grams/second of airflow not an altered number to get the fueling correct, which is why I'm hesitant to mess with the MAF calibration tables. (since they are for calibrating the maf, not adjusting fuel).

I can't seem to find a table for a BPW multiplier vs grams/sec, but that's what I'd expect unless it's a global static definition.

-- Joe

Orr89RocZ

iTrader: (20)

I do believe the ve tables are still used with maf to determine fueling. I would assume speed density is also the backup in case of maf failure. Its been a while since i looked into it. But i always disabled maf and tuned speed density first then if reusing maf, enabled it and checked fuel, tweak maf calibration as needed but never seemed to need alot of change

I dont see any other maf tablenor value based on BPW

Badas.sbird

Unless you run in SD mode then the VE table doesn't do much at all. You can also set the WOT AFR with the PE tables in a way very similar to an LS car.

anesthes

iTrader: (12)

I've read that and been told by TC that the VE tables are only used for some BLM blending under very specific conditions, but generally speaking during MAF failure.

-- Joe

Fast355

iTrader: (2)

I have not looked into any of the coding, but would have to assume it is similar to the 350 Vortec and LS code. The volumes get blended together. Fuel changes done to the VE table are about 1/2 as sensitive as ones done to the MAF calibration. Generally speaking unless you change the intake tubing, intake manifold or air box you will not have to do much to the MAF tables. For example GM used the same MAF tables with only very slight value changes from a 305 to an 8.1 in the 01-02 Express vans. The air cleaner, MAF and ducting is the same on all 3. Small blocks had the Vortec hat on top of the throttle body and the 8.1 has a more forward mounted throttle body, yet the tubing was the same. At low airflows with a cammed engine the MAF table often can use a little tweak down lower in the rpm range because the MAF under reports due to reversion but generally I only have to make changes under about 30 gms/sec with cams.

anesthes

iTrader: (12)

Hrmm..

So on this motor, it's a 355 now, with ported heads and bigger valves, cam, ported intake manifold. Throttle body, maf, and intake duct is all factory.. So should I assume only AE and PE needs tuning and for the most part the MAF is handling the fuel map under part throttle? (other than the low airflow stuff you mentioned above).

-- Joe

Thirdgen89GTA

iTrader: (5)

This thread is relevant to my interests. I'm running EE with a MAF on my LT1. And I too have a cammed 5.7.