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

[hotrodf1]

Even you are new to efi your are learning fast. All your assumption are correct.

Try this patch. It updates baro once at ign on only. The value is converted to display accurate baro reading. I assume 2 bar map sensor outputs $80 at 1 bar and $ff at 2 bar. You can check the reading with altitude meter to confirm that the conversion is correct.

Should say too, the baro reading hasn't gone nuts to 10.35 ever since it happened that last time. Odd.

Anyhow, I'll give it a try. Would be nice to get the tables back in line.

To make sure I don't totally foul this up - should I start with the values for cylinder volume and open loop % change vs. MAP that I had used in my previous 1 bar MAP tune? And then obviously progress slowly into boost and she what she does?

[hotrodf1]

Tried the new patch last night. The conversion seems pretty close, close enough I do believe. ECM reported 99.5 kPa or so. However, I ended up having to still keep the cylinder volume maxed out and the % change vs. MAP table (I'm running open loop only) at the same values as previous tune to get the AFR where it should be. Just from what I observed, it seems that it's still pulling from the minimum result from the baro correction table.

I'm not sure what trouble that will cause. Do we keep trying to fix it, or let it be?

[kur4o]

Actually engine needs more fuel with lower baro readings. It is more efficient I guess.

If you can`t add more air in the equation, your choice is to add more AFR. As a last step play with the injector fuel flow scalar.

Can you find a bin,xdf,adx of that cyclone turbo car.

[hotrodf1]

I was thinking the requirement for the higher values, was due to the fact that the ECM is calculating less PW because there is much less air density. Less air should need less fuel, so to make up for that in the calculation, I gotta swing these values way high to compensate.

Nevertheless, I have the tune working OK right now I think. So far the baro update deal seems to be solved. It's getting fun: she's loosing traction at about 50mph, with only 5psi haha.

[hotrodf1]

Typhoon / Cyclone is $58 it seems. There's a thread with all the versions of it etc., several to choose from.
http://www.gearhead-efi.com/Fuel-Inj...information-58

[hotrodf1]

Just a quick update: tuning / driving has been going relatively well. I had to take out a whole lot of accell enrich value due to the extra fuel I guess that the open loop tune throws in. Through many iterations, I had to cut them in half to get a reasonable throttle response, but it's much better now.

I do have one issue that I haven't figured out - every now and then, the car seems to lean way out all over. For example, the idle is normally in the 13.6-14.0 range, kinda moves around some. It stays this way most of the time, but sometimes it will go straight to about 15.3 or so and always return to that for the rest of the run. Then the next day, it seems to be fine and back to normal. If I don't catch it when it does this lean out, it will not run well under boost (duh!) and pulls lots of timing and all. So far I've been lucky it hasn't been hurt I suppose.

So now I'm going to watch the PW real close when it does this again, and see if it's actually changing the PW or if there is something else going on (like fuel pressure or ???). I've got a FP gauge under the hood too, so if it does it again, I can also view that to see if something wonky is going on with the regulator. ALso will watch the MAP reading / density reading to verify something hasn't gone wrong there.

Fuel system is stock third gen to the motor, then stock LT1 to the rails etc. The fuel pump upgrade is Quantum Fuel Systems pump replaced the original in tank. I forget now what the flow was, but did a fair amount of research and this should be plenty.

Against all recommendations, I have not replaced / added to the fuel pump power circuit, as most guys seem to do.

[Repair]

I just wanted to let anyone interested in this patch I use it in my sts 2bar boosted tune and it does work I want to gives thanks for all the hard work you've done it wouldnt be possible for me to tune my on without your hard work