I've got all the info for my 165 ARAP Vette, but I just picked up a 91 GTA to play with. What's the latest ecu file for it - I've got the one from diy-efi ftp. Is there a certain BCC that everyone gravitates to like ARAP? Thanks for the help.

 

AUJP if L98 auto.

 

How about ecu files?

 

What about the AXCR (auto) and AXCN (manual)? Can these bins be used as a starting base?
They are from a '91 Corvette 727 ECM (speed density).

 

I wouldn't recommend SD Vette Bins for F-bodies. Primary reason being Vette Bins monitor/report the "Oil Temp Sensor" while F-bodies don't have any such input. Even if I converted my L98 Auto to a Manual, I would work with the SD 305 Manual Bin rather than a Vette.

 

I wouldn't use the Vette calibration in the 3rd gen for a different reason--Aluminum heads on the Vette. Unless you change the heads to aluminum, your spark curves are going to be more off to start off with.

The oil temp sensor code is a simple 2 bit change in the bin (for high and low codes).

 

I totally agree about the aluminum heads. Especially if you've ever looked at the spark tables of the Corvette bin! It's a huge differance!

The oil temp could also be simulated with a resister for a standard tempature.

 

Basically, I have foudn that Vette Bins seem to have driveabilty problems when used on F-bodies an vice versa. There are lots of "little settings" that differ between the two that make me prefer to use Vette Bins on Vettes and F-body Bins on F-bodies (for SD cars).

I did a Binary Compare on the two when I first got into eprom burning and found virtually every byte different - including the actual code. Lastly, there is extra code in the AUJP that is not in the ANHT. This is the primary reason for all the "instructions" appearing different. I am STILL "documenting" my AUJP Source Code and I'll inform you on the specific instruction differences when I find it.

So while the "Data Portion" for the Vette Bin is located in the same areas as the F-body AUJP, there are many other differences including the source code.

 

Not sure I agree with the generalization on using Vette bins in F-bodies. If your engine happens to be configured resembling a Vette, eg. aluminum heads, higher compression, 6-speed manual trans, running a Vette bin makes a lot of sense.

As stated above, disabling the oil temp error bits is easily done.

In my case it was the lesser of two evils...either run an F-body bin for an auto trans, or run a Vette bin. Since my engine has Vette heads anyway, no real issue.

 

There is also the SD 305 5-speed bin.

The "generalizations" are past experiences trying to resolve "driveabiility" issues that "just won't go away". Usually going with an F-body Bin for 7730 or a Vette bin for 7727 as a "base" and tuning from there was often the only solution that worked to resolve the driveability issue.

I am still concerned about the extra code that exists in the F-body AUJP bin that doesn't exist in the Vette ANHT Bin. When I figure out what that extra code REALLY does (or does not do) I will let you know.

 

I would be interested to be kept up to date on it. I originally was running the ANHT bin in a Vette platform, but I have iron heads (85, so I had to delete the OT codes). I ran it for a brief time, then decided to go with the AUJP mainly because I figured my combo was more built along the Camaro's engine.

Unfortunately, I made vast Diacom runs with both setups but the CCP system was skewing all of my lower BLMs. At tip-in, when CCP enabled, I got pig rich. It was a hardware problem with the system itself and not actually with my VE tables. So, in the end, I never really knew what my Diacom readings would have been with the ANHT to start off with.

I have a new engine going together...still iron heads but a different cam. I will give both chips a shot and see what calibration gets me closer to start off with. Engine should be baselined ~July 4th weekend or there'bouts.

 

So, which .ecu file is the latest and greatest?