dmoffitt

I'm replacing my autothority chips with guru chips and it seems either the guru chips have less pins than the autothority ones (or stock?) or that the autothority chips have more pins than the stock / guru ones?? i'm at a loss as to how to put these in (ie which side to align it to, there's a little dimple on one side etc)...

help!

jimbo1111

You probable got the late model chips. don't put them in unless you want to fry something. Return them for your year chips.

adrial

what I think jimbo meant to say was that you have a late model DME and thus need to ask Guru for late model chips. "Late model" in this case means 1988 and on.

So, at some point your DME got fried and one of the PO's replaced it with a 88 and on DME...

Steve Lavigne

According to the '86 to 88 conversion' portion of FR Wilk's site, there is a jumper wire which needs to be removed to allow 24 pin chips to work in an '88 dme.

This may be a better choice considering that the resale market for 24 pin chips, especially with a K26/6, is somewhat larger. More importantly, you won't have to wait.

<a href="http://frwilk.com/944dme/" target="_blank">http://frwilk.com/944dme/</a>

Danno

Uh, it takes a lot more than moving a jumper to convert the 951 DME to use the later 28-pin chips. Not only do you have to solder in a 28-pin socket, you also need to ground a pin on the CPU itself to disable its onboard program and run the one off the chip instead.

IN dmoffitt's case, that won't help any because I sent him 24-pin chips for his '86 951. But it turns out he's got a later '88+ 28-pin DME. There's no way to make a 24-pin chip work in a 28-pin DME. He's got another chip on FedEx now...

Steve Lavigne

Danno, did you look at the portion of FR Wilk's site that I mentioned. Is his information not correct?

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">Originally posted by Danno:
<strong>Uh, it takes a lot more than moving a jumper to convert the 951 DME to use the later 28-pin chips. Not only do you have to solder in a 28-pin socket, you also need to ground a pin on the CPU itself to disable its onboard program and run the one off the chip instead.</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">I was talking about making a 24 pin chip work in a 28 pin dme. Also, to convert from a 24 pin to a 28 pin socket, as the pictures show on FR Wilk's site, you don't have to replace the socket, you can just solder 4 pins in.

<img src="http://boards.rennlist.com/upload/88_pins.jpg" alt=" - " />

</font><blockquote><font size="1" face="Verdana,Tahoma,Arial,Helvetica,Geneva">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva"><strong>IN dmoffitt's case, that won't help any because I sent him 24-pin chips for his '86 951. But it turns out he's got a later '88+ 28-pin DME. There's no way to make a 24-pin chip work in a 28-pin DME. He's got another chip on FedEx now...</strong></font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Arial,Helvetica,Geneva">You'll note that what I said was in regards to using a 24 pin chip in a 28 pin socket. Again, according to FR Wilk's site, if you remove the jumper wire shown in the following picture, the 24 pin chip should work.

<img src="http://frwilk.com/944dme/images/88_jump.jpg" alt=" - " />

I couldn't speak as to the validity of the information that FR Wilk has posted. I do know that he has posted way more information regarding the inner workings of the Bosch ML 1.2 and ML 3.1 ecu's than anyone else I have seen. That said, quantity alone does not necessarily make someone a guru (except on Rennlist ).

gatorbait

David,

Unfortunately, I can't answer your question, but I'd be very interested in hearing how it goes after you do the installation (I'm considering pulling my Autothority chips and replacing them with Guru's chips also).

Good luck with the install and please be sure to post your findings.

Thanks

dmoffitt

Thx everyone - esp. danno for sending the new ones out so fast etc i'll post results soon, i just put the car back together, she started like a champ last night (except one little hickup - we forgot to install the rotor lol, i'm like fuel? check. compression? check. spark?.... spark?... oh. oopsie!)

<img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" />

Danno

Steve, sorry if I got our intents mixed up on the previous posts. The 951 DME is completely different than the NA. In order to go from 24-&gt;28 pins, there are two jumpers to deal with along with hard-wiring to one of the CPU's pins. This only works for upgrading from 24 to 28-pin chips because what you're doing is replacing the built-in program on the CPU with the one on the 28-pin chip (they're identical supposedly). Then you can reverse the process and revert back to the 24-pin configuration.

However you can't convert a DME that's originally a 28pin model to use a 24-pin chip. It's a completely different box than a 24-pin DME that's been converted to 28-pins.