I have $A1 code right now (90 grand prix), would there be any gain by going to $8D code, The only thing I see would be that the $8D has more software support.


Also with moates scanner I'm getting some funky values, but some correct values, is this due to the $A1 code not being $8D.

Ryan

 

I believe there is a commented hac for the A1 floating around the net somewhere. If you can snag that, then you'll be even with the 8D guys. Just you won't have the bells and whistles. With some studing you can edit in hex as well as with an editor. If you can't find a hac, then yes, the 8D might be a better answer. Note the word, might, you'll have to just try it and see what you like best.

 

Low.

Since I think the $A1 is for V6s the switch must be from $A1 to $88.

The $88 is a calibration with good support.

For A1 you needs a specific scanning software.

For more information you can see my posts (07-31-2002) at the sticky in V6 forum. I did a lot of tests in my V6 with different calibration codes (I used $88, $A1, $6d, $3A, etc.).

Regards,

Denis V.

 

Isn't the $8D code better supported than the $88? My problem right now is scanning my ecm. Moates works for some values. I do have the Hac and a good editor. Is $88 strickly for V6's??

 

Thanks guys,

I read the V6 post and it took care of all my questions. I'm going to switch to the $88 code. This should keep me busy tunning my winter car till I bring my truck out in spring.

 

Dennis,

I looked around and could only come up with Diacom as a scanner for the $88 mask. Are there others??

 

Please, note the following:

- The internal PROM organization (bin) is named the mask ($88, $8d, $A1, $6d, etc.)

- The data organization for scanning is named datastream (A57, A38, A25, etc.). This classification is not used and unknow.


In order to reprogramming the EPROM you needs know your mask: It's $A1 (mine is $6D).

For scanning your ECM and to read the data you needs know the datastream (mine is A57).

Diacom 8d probably is for others datastream not compatible with A1.

I need your engine specifications for more help.

It is V8, V6, L4?, 2.8, 3.1, 3.4, 5.7?, TBI or MPFI? VIN?.

 

Dennis,
Its 3.1 MPFI. 1990.

 

O.K. Probable datastream A57 too (or A109).

For this datastream, I'm working in a new free scanning software. If you can wait some weeks, you'll can test this software in your car. Otherwise, I think only the X-Ray can scann this car.

 

ok first issue $a1 is a DIS cal both $88 and $8d are for dizzyzs. id sugest sticking with $a1. get in touch with tunercat and see what the most up to date TDF for $a1 is.

 

OK I'm a little confused, I thought a 730 is a 730 is a 730, only the memcals are different. Therefore why can't the prom just be changed for a different configuration??

 

a 730 is a 730 is a 730. the differnce is in the dwell calcs. you can modify the $8d and $88 to work but its uncharted turf and to be honest not worth the effort. id stick with the $1a or if forced induction is your goal go with a $8f the pinouts identical.

 

Originally I had the $6D mask, then I switched to the $A1 mask, no problems. What dwell calcs do you mean funstick?? Shouldn't a 3.1 L $88 bin work just fine in my 3.1 L????

 

your car doesnt have DIS id imagine the the $6d does. i could be wrong about that though. if its DIS stick with $a1 and get a tunrcat TDF and slice through it its very well hacked. if you dont have tunercat i dont know what to say. but if you have DIS then stick with DIS code if not then stick with distributor code. and the dwell calcs do strange things with DIS you have to invert a few things and add mroe to one and take away from the other. its strange. ive had limited sucess with the 749 $58 running DIS but its been easy come easy go. even when i replicate the DIS advance max and advance retard and ref timing indicators its still goffs up. there are some difference in the acutal way dwell is calculated in the DIS codes not big one but minors ones thatll make you go crazy.

 

Funstick,

I see what your saying, Yes I do have DIS. I was unaware that such problem would arise with timing, by going to a distributor prom for DIS. I guess I will stick with the $A1 mask.

Now, time to build another Diacom cable as my old one is trash.

 

the $a1 is a good code. however id make sure to get the tunercat TDF its very complete and upon request they will add things as long as its not to extraneous.

 

If you do not want to pay close to $100 for software that does not even offer a "complete" definition file, you may want to check out some software that "does" offer a complete definition for the $A1.
Its called GMPCM.

 

Thanks, I got the gmpcm software a couple months ago. Its pretty good so far. It will be nice once more pcm files get made.

 

Thanks.
There have been 4 added just recently. It seems that since it still contains all of the original code hacking utilty (its original purpose) , many have found it perfect for generating new definition files of thier own. These same great folk's have offered this very impressive work to be downloaded and used freely from the GMPCM website! I myself have just completed a PCM file for the $DF (3.4 DOHC V6) which I am very proud of. :-)
So, check the site frequently as it seems to be growing at light speed...