2 bar tune for Turbo LT1 F-body possible with '93 ECM? DA3
Trying to decided to take the plunge on a 76mm On3 turbo for my LT1/T56 swapped third gen F body.
I'm shooting for a low-boost 5-7psi for a fun street car. Motor is stock lower end, ported heads, 224/224 cam.
I have the unique to '93 LT1 ECM, and have tuned it myself with TunerPro RT and the Moates setup. I'm currently running dedicated open loop, and feel pretty solid with that.
What I'm wondering is, can I install a 2 bar Map sensor and make the stock ECM work for this turbo application? Is there another GM ECM that would work better for this?
Is there a way to make TunerPro show 0-200kPa like the sensor will be reading, or do I just need to do the conversion by hand (50kPA on screen = 100kPa real life)?
I'm assuming I would need to "truncate" the VE and timing tables from 0-100kPa, then be very cautious going from 100-200kPa and sneak up on a safe tune little by little.
Do any of these assumptions ring true, or am I asking for trouble doing this?
I know that's a lot of questions in one post, sure would appreciate any feedback out there. Thank you!
How to disable barometric refresh in $DA3? Using BDLD bin
I have another question too, I read that I need to disable the barometric refresh / sensing or something of that nature when I go to the 2 bar sensor. I have noticed the ECU has a separate reading for barometric pressure and MAP, but perhaps it's coming from the same sensor?
i'm not sure I've got that capability to turn off in TunerPro RT. I don't see anything like that in the variables that I have to play with. So if I can't do something with that, am I screwed trying to get to a 2 bar tune with the stock ECU on $DA3? :mad1:
Need help with Baro update issue!
Quote:
Originally Posted by
Xnke
It's been talked about in the $EE code for a long time, but something was in the way-I am not sure what it was. I know the RPM limit is hardcoded and would require a major code redesign if you wanted to go higher than the factory PCM's max RPM (not the stock engine redline, but the "PCM" redline...) and I think the 2-bar MAP swap was something similar. Hopefully this thread will result in a proper 2-bar support for the LT1 PCM...there are a few old Nissan V8's that could REALLY benefit from this (they used a distributor with a timing output identical to the optispark!)
I'm pretty sure the $EE code has the baro update feature worked out already. I think skinny pedal said he was able to turn it off.
That being said, if someone was sharp, it seems as if they could use the code in $EE to find where it's buried at in $DA3, maybe it looks similar. Might be way off base on that. Again, over my head at this point.
I think I'm at the point where I'm just gonna have to try it and see what happens. Then, if it doesn't work. . . . I"m not sure what I'll do. LOL