How to ID my transmission?

[pocket-rocket]

I've seen what happens to an engine that doesn't get regular changes. It was in a 3100 Beretta. I had to do LIM gaskets on it and the inside of the engine had caked and baked oil about 1/4" thick... it was one of the grossest things I've ever messed with.

Oh, and you forgot a fluid...

[Schmieder]

this could porobably go in your trans tuning thread, but oh well.

does OBD2 reference the MAP for a barometer reading at start-up? if so, with a 2-BAR, it will be seeing ~50kPa or less... could effect a few things the way it would with OBD1.

Ehh, I know I jump threads. I try to keep the base topic where it belongs but we all know how that goes sometimes.

I plan on scaling the VE tables so if it refers to that table then it should be ok. As long as the actual voltage signal from the 2-bar MAP refers to the equivilant desired value of volumetric efficiency it shouldn't know any different until boost and that will be tuned as well.

What was the issue you speak of with OBDI, as I hope it won't happen with OBDII. I'de really like to ditch the MAF.

I've seen what happens to an engine that doesn't get regular changes. It was in a 3100 Beretta. I had to do LIM gaskets on it and the inside of the engine had caked and baked oil about 1/4" thick... it was one of the grossest things I've ever messed with.

Oh, and you forgot a fluid...

1/4" thick, damn!!! Imagine the smoke that sucker would have pumped out after a seafoam injestion into the vac lines!!! I would expect the fire department, lol. That would be a sight to see.

Blinker fluid, haha. I may be new to engines in some respects but I am no dummy, lol. Thats a good one, funny.

I consider a head gasket change a relatively 'easy' job for my car anyways.

Put it this way...I am an expert at what I own. After advice and info mining of course.

[robertisaar]

the issue was with a barometric pressure reading. most of the later OBD1 masks used barometric pressure to adjust things like fueling, spark and shift points. if it saw 50kPa as baro, it would do some pretty drastic things in an attempt to keep everything working properly.

i'm not sure how low-level of stuff you can access in OBD2, but in OBD1, we could access the scaling function if necessary to make it all work correctly.

[3400-95-Modified]

I plan to have a 2-bar map sensor soon so I can run w/o the MAF. Then I can reinstall the lines for PCV system, emissions.

Whats with this floating theory that a 2-bar map setup will negate the need for a MAF and make it run better? IIRC this "tuning" method was used by RSM with their supercharger kit, and many people hurt their engines because of this.

Deleting the MAF from a turbo setup is not the best idea. Its also somewhat of a downgrade because your going from raw air flow data, to a speed density calculation.

Use the 2-bar map in conjunction with the maf, and upgrade to a larger maf if necessary, but I wouldn't remove it.

[Weatheralls Auto]

I am not entirely sure his Cal will work with a 2bar anyways.
Def stay with the MAF

[IsaacHayes]

Actually Jon, the RSM "tune" was not a tune at all. They did not use a 2 bar MAP. They did nothing but remove the MAF and delete the DTC codes. That's it. I'm guessing they removed the MAF because it would give a too high of reading once boost hit and that would cause DTC/etc. Those engine basically ran lean when boost hit. No additional fuelling.

I just suggested it in ADDITION to the MAF so if the MAF failed, the car would still runs safely.. I do know some LS1 guys do ditch the MAF and run in speed density, but that is personal preference.