Hey,

Will the super aujp bin work on a stock LT1 engine? Will I have to change the injector size to 24?

 

Doubtful.
The LT1 is Optispark.
Thou someone has mentioned getting a 730 to work on one. If you can get the 730 ecm to talk to the Optispark then yes.

 

ok. is there a better than stock bin around that I can get off the web? also, I've got a stumble during acceleration after I've been driving for a few hours.. any ideas? I'm not getting any codes, but I thinking its the knock sensors..

thanks

 

If you're talking about an LT1, as in OEM-type LT1 engine management (e.g. fourthgen F-body), an off-idle stumble is very often a faulty EGR valve. Second bet would be the OptiSpark, and third would be the coil wire. None of those will necessarily set a code, even on an OBDII car.

If you've got an OBDI LT1, I'd recommend TunerCat for editing.
If you've got an OBDII LT1, you might consider switching back to OBDI. It's a very easy conversion.

Downloading a bin off the web isn't going to correct a mechanical or electrical problem. You need to track that down before you start messing with the calibration.

I assume you already have some sort of scantool, but in case you don't, FreeScan and Datamaster both work well for OBDI LT1s.

HTH,

 

thanks for the information. I am not trying to correct the stumble with the tuning, just give it a little better performance. Yes, it is an OBD1 system.

thanks

dale

 

If you start messing with that PCM, be really careful about voltage drops while you're flashing it with the new bin. If there's any hiccup at all, the PCM can lock up on you. (Don't ask how I know this). I wouldn't try flashing the PCM with a laptop running off the battery -- I'd rather be plugged into household AC. Ensure there's nothing extra running on the laptop, no screen savers or power management, etc. It's even been recommended to remove the fan relays before programming, so they don't kick on when the PCM does it's self-test. Watch that you don't accidentally activate the dome lamp or anything else during the process. Even then, it's still a "hold your breath" operation.

The best way is to make a bench harness, and flash the PCM with it completely out of the car. Or at least, have a spare PCM on hand, in case something bad happens.

Kinda makes you appreciate the older ECMs, where you just throw your backup chip in, and drive away.

As far as the stumble goes, the other thought that just occurred to me was "fuel pump" , maybe if you've got one that's on its way out, and gets weak as it gets hot...I dunno.