I have a 7747 and a 7165 both with memcals. can I not use either of them? if not I will just toss them to the market.
I have a 7747 and a 7165 both with memcals. can I not use either of them? if not I will just toss them to the market.
The 7747 will not run MPFI.
The 7165, seems to be a slightly unpopular ecm that gets swapped for a 7730. But thats based on what I have read on here, never used/tuned one or even been around one myself.
Ok, this will take some explaining and might need to find links if you want to go this route (All information IS on this site).
Anyway...
The '7747 does not use a MEMCAL, it uses an EPROM (or possibly just PROM depending on date of manufacturer or application), and a CALPAK.
Yes, there is a way to use the MEMCAL from the '7165, but will take a little work to the harness and slight modification to the MEMCAL to work. You will need an external ESC module, this will be a part of the '7165 harness, and even the '7747 harness. It's a square box about 3" by 3" by 5/8" and has 5 or 6 pins (sorry I don't recall exact pin count off hand). The knock sensor will go to this ESC and then the ESC will then send a signal to the '7730, on a different pin than where the knock sensor would actually attach, again I don't recall the exact pin off hand, but the information is here. There is a small modification needed on the MEMCAL to tie this up, and that is to add a 4.7K ohm resistor across two contacts of the MEMCAL, this keeps the ECM happy when it looks to see if there is a knock sensor attached, so that it will not throw a code or automatically retard timing.
The LHM (Limp Home Mode) NETRES (NETwork of RESistors), should more closely match yor V8 than modifying a V6 MEMCAL for your application.
If I was in your shoes, this is likely the route I would choose. The other route I would choose would be to modify a V6 MEMCAL that would actually take another jumper modification on the MEMCAL and would likely not work in LHM.
There is no guarantee that the LHM NETRES of the '7165 MEMCAL will work in the '7730, but it might. I have not tried this exact combination. However, I HAVE used a V6 MEMCAL modified in a '7730, using the external ESC modification, and it worked well, on a turbo V6.
If you decide to sell the '7165 with or without the MEMCAL, let me know.
from what i can tell, every MEMCAL(except for the oddballs that didn't have any LHM stuff like the northstars) kept the same basic design, just different resistor values. i wouldn't be surprised if you could take a 92-93 LT1 MEMCAL and use it's LHM stuff for a 7165 and work exactly as expected.
Here is a thread that I started on another site that has some information.
http://www.thirdgen.org/techboard/di...40#post5309404
Thanks for the link. I will read through that. At this moment I am thinking of just hunting down a 7730 out of a TPI V8.
No I will be data logging then having Eaglemark give me a proper burn for my application. I don't plant to leave the ECM stock. that wouldn't make much sense.
I would very highly reccomend buying one of these when you do get the 7730:
http://www.moates.net/gp1-package-gm....html?cPath=64
The stock and highly valuable AUJP memcal will simply plug into it, leaving it unmodded. It then gives you a ZIF socket to make swapping out chips super easy, not to mention you will get two blank chips with it. I am running one in my 7427 and love it. Saves you the trouble of having to desolder the stock prom from the memcal and solder on a new prom.
I would be surprised if the stock PROM didn't run the engine quite well to start with.
Setting up $12P is not for the beginner, or at least not for a beginner that wants someone else to tune it for them via remote. Sure it could be done, but it would be a lot more frustrating and take a lot longer than using the '7730 and $8D, or even S_AUJP.
$12P was no more difficult tha $8D or S_AUJP.
That being said with vortec heads, a different cam in a big heavy suburban the stock prom will not run well at all. I have run that exact setup and it took alot of work to make things run even halfway decently. Stock AUJP was nearly undriveable with my setup.
I've used $12P, and would not recommend it for this situation. For someone that wants to tune their own vehicle, sure, go ahead, but when it's going to be mail order tuned, and by someone who has no experience with it (Eaglemark has said this on a few occasions), it would not be a good idea.
I don't know why you had such an un-driveable vehicle using AUJP on a combination like this. I've used it (and S_AUJP) on a bored 348, that was 365 c.i. IIRC (think baby 409), with custom intake manifold, a rather large cam, home made headers and a few other things that should have made it "impossible" and it ran well enough to drive around and get datalogging. I'm not saying it will be ideal, but should be good enough to get a base from.
Man I build PCs and electronics for offroad vehicles I have done soldering at board level but for some reason I just am having issues trying to wrap my head around this prom memcal stuff. I do not want to make this a hobby. I want build the engine, get in, Record the data and give specs and data to Eaglemark to burn my a new prom? memcal? apple pie? and send it back to me and would like to be done after that.
Six shooter are you saying eaglemark as no experience with burning? or me? I don't want to get into burning if I don't have to.
I am not trying to come off as some jerk I really do appreciate all the info I am getting here which is why I signed up. Like i said I am just having to figure this out.
on another note. I have located a 7730 with a AUJP.
As stated before :mad1: