Does anyone have the $DA3 mask handy? If so, could you please post the AE tables from it? I'm curious to see what GM did on these early SD, batch fire LT1s.

Thanks...

 

Hope this helps.. This is from a BDZP memcal which is a LT1 auto bin with 3.23 gear ratio.

 

Thanks! WOW! GM is adding A LOT more fuel than I've put into mine.

I'm going to throw these tables into my cal and see what happens.

 

So wait, you're running the $DA3 mask in your car? Because if you aren't, I wouldn't copy the AE from one mask to another.

 

No, I'm running the $8D mask. Are you saying that a value of say 1.500 in $DA3 is not necessarily greater than a 1.400 in $8D??

 

I wouldn't. I'd take the stock tables, look them over, and make changes and take notes. The only things that really can "transfer" over between masks resonably well is the VE and main SA tables. Even the cts SA table can't be copied over because they aren't used the same way in every mask!
Let's say there is a factor somewhere in there that multiplies the final AE by .8 where as there is no factor in the $8D, now if you copy all of the obvious AE tables word for word you'll have .8 of the AE and be worse off because of it, make sense?
Definatly take notes on how the Lt1 handles AE but I wouldn't advise copy and pasting.

 

Noted.

Uh, yeah... I'd say the SA transfered over exceptionally well!!
Thing is though, I've been increasing up to these AE values anyway just through my own testing. However, in order to completely rid the car of the all-too-common Miniram tip-in stumble, it was getting to the point where the car wanted (and apparently still does) so much more AE than an AUJP car, that I started questioning it. Up to this point, I've been going on Grumpy's ol' addage "give the car what it wants". I also read a ton of material in the archives about what people (Traxxion, 89Vette, and others) were doing to get rid of their stumbles. It then occured to me that the early batch-fire LT1's were a good reference OEM point since mechanically the engine is a lot more similar to mine than any TPI would be. Unless GM is doing something unknown to us like you said, it would appear that they had already arrived at the point where I'm currently headed.

 

I agree with JP.
89 didn't list any constants above. They may have cut a constant by 30% and stuck more fuel back into a table.
But at a glance, aujp has a considerable difference in the PW vs DRP table and the Mult vs TPS tables.


In discussions I've had offline, it was brought up that Traxion added a considerable amt of AE when he went to a mini ram.
But his combo is a bit different from yours.
69 Ghost told me he had to add 30% or something AE when he went to an LT1 intake. TB will make a difference too.
Might ask around.
A high speed datalogger and a WB is a quick way to see how the AE is doing.

 

You might try to bring PE in a little sooner as well. Sometimes that will help a tip in problem.

 

I have used the AE and PE tables directly from the DA2-DA3 bins with fantastic results. Traxion in the past stated that a Mini wants at least 30% more pump shot but also drops it off sooner. He alludes to a 50% pumpshot is what he ended up with in another post. The first clue is if you hit the throttle as quick as possible and it backfires you don't have enough AE pumpshot. So far my motor likes it -alot. I have just started WBO2 tuning and I am all over the place tuning for PE, etc. I can send you a copy of what I am running right now. My setup is very similiar to yours. Currently my only problem is my car does not behave when it is cold and I put it in gear it stalls. I am also curious about your split BLM issue you had a while back...

 

69Ghost, you have mail.

 

Well, I input the AE tables above and sure enough, the throttle response is significantly crisper than before. A little more fine tuning of it and I should be good to go on the AE.

The PE and SA from the $EE mask worked extremely well. Now, the AE from the $DA3 mask improves the throttle response. Can't wait to get that LT1 PCM into the car. It's going to be awesome!