Hey I did search on this, I swear.

I checked the ecm stuff in the tech articles, so I found 1/2 of what I was looking for.

I bought an ECM from the junkyard today, that I may play with this winter if 165 doesn't end up working out.. (or 808)..

It's from a 91 3.1 firechicken. Now, I know I have to change the prom, which I can burn -- but what about the memcal??

Also, what in *** creation was the other huge metal servo bolted in the dash? I looked at the
"repinning a 165 to 730" and it doesn't mention it. I also looked at the "TBI to SPeed density swap" and no mention either. But I'm in lala land.

I may never get to this 730, I wanna give the 808 code a try twords the end of racing season, get at least a days worth of time trials in with that, and the 165. Then record differences (if any). But I hear I can run a 2/3 bar MAP with the 730 which would be nice with the blower, I can toss the vortech FMU!

-- Joe

 

No, you need a memcal from a v8 application, and perferably one closest to what you're running. The v6 memcal is a paperweight now.

Where in the dash? One of the vent servos?.

No you can't use a 2/3 bar MAP with a 730.
You can use a 2 bar with a 1227749 which is about a twin to the 730. But, there are differences, and that's been covered in the archives.

 

Grumpy just beat me to my reply, but I basically say the same thing:

1) V6 Memcal won't work on a V8 car EVEN if you reprogram the eprom. I tried it and the engine WILL RUN, but the SES light comes on (Code 51).

2) As for the servo, no idea. Something unique to that car possibily. Got a picture?

3) Go here https://www.thirdgen.org/techbb2/sho...threadid=46333 if you want a recent post where I explain what you need to do a 165 to 730 swap. The biggest difference to a 808 vs a 730 swap IMO is you must repin the harness for a 730. No big deal, can be done in less than an hour (with some practice, less than 30 minutes). Read my article on "MAF to SD made easier". It is very easy to "pick those locks", which is the primary obstacle that frightens people when swapping from 165 to 7730.

4) As Bruce said, a 7730 must use a 1 bar map. You CAN "kludge" the code of the 7730 and "rescale" everything to make the ECM think it has a 1 bar map when it really has a 2 bar map. Then 100 kpa is 200 kpa and 20 kpa is 40 kpa. The 7730 being so well hacked makes this simple to determine all the things you need to change.

The problem is your resolution is cut in 1/2 and you have no correctioni tables for MAP readings below 40 kpa. Effectively you have no Deceleration Mode as most of the DFCO is triggered by the MAP sensor when certain readings fall below 30 kpa. With a 2 Bar map, some of the tables won't be "tunable" below 40 kpa.

Also, as Bruce has pointed out in another recent post, the ECM does a "reading" of the MAP sensor when the key is first turned on to get a baro-reading. As Bruce said, this is most likely to give you problems is the ECM thinks it is at an elevation of 40-45 kpa when it really is at Sea Level.

To do it properly, you need to dive into Source Code and start modifying the tables and code to properly use a 2 Bar MAP sensor, which no one has done. Or, if someone has done it, they are not sharing it. This is something that I have looked at myself, but have not had the time to do this.

Can a 7730 be made to use a 2 Bar MAP sensor quickly and easily? Maybe. You can always give it a try. Can it do it properly? Yes, but it requires proper changes to the source code IMO and it won't be quick.

That is why guys look at using the 7749 code.

Now, there has recently been talk of a few guys that are running the 7749 code on their 7730s. I beleive Traxion (Tim) has done this.

 

Hey Guys,

I'll go back tuesday and write down the #'s and try to take a snapshot of that servo.. It looked like an ECM of sorts, perhaps some type of speed buffer the v6 cars used? But it was huge, like half the size of a milk carton.

The "using 749 code in a 730" was what I was talking about.. Otherwise, in a supercharged application, MAF is the best way to go.. right?

Thats partly what I'm worried about in the 808 code.

The 749 is a supercharged sunbird or something right??

-- Joe