2 bar tune for Turbo LT1 F-body possible with '93 ECM? DA3

[Xnke]

No, the LT1 PCM does not and as far as I have been able to find, can not support the 2-bar map sensor. It was a similar situation with the P66 6-cylinder PCM and I thought after doing that one, that the $EE PCM could be done too-but apparently there is some trickery needed that doesn't work.

[hotrodf1]

I thought I read though where a 2 bar MAP sensor voltage range is still 0-5V, but instead of 0-100kPa, its now 0-200kPa, unless I'm totally confused. So the ECM shouldn't care, since that fits into its range?

[hotrodf1]

Happened upon this thread too.
http://www.gearhead-efi.com/Fuel-Inj...Turbo-LT1-Tune

So apparently he was able to do it. But on $EE which would be a flashable PCM in the 94-96 F Body etc.. Not really sure how different that is from $DA3. I'm cautiously optimistic . . . .

[Skinny Pedal]

Not hard. Just remember to scale everything.

[hotrodf1]

Cool I think I’ll get a 2 bar map and try to set everything up NA to prove to myself I can do it!

[Skinny Pedal]

Awesome!!! If you need any help just ask.

[hotrodf1]

I do have one question to start with. Since the VE tables only go to 100, I need to rescale by some factor, correct? The motor wanted more fuel even in NA trim, so I recall that I bumped the cylinder volume up about 10% or so, and then scaled all the VE tables down by 10%, thus gaining headroom for more fuel.

Is this the right way to go on a turbo motor as well? So then I'd bump the cylinder volume up by say 40% or so, then decrease the VE tables by 40%? Or is there a better way? I know you could use injector flow too. ??

I'm running Open loop, so I use the % change fuel vs. MAP sensor table which has worked out well in NA trim - I could use that to dial up the fuel too I guess, since the kPa range will affect that table. Any thoughts there?