What all is needed to swap out a "7747" for a "730"? This is going into a TBI powered Chevy pickup that I used all parts from an '88 454 powered Silverado that had an auto trans. My truck has a manual trans, no EGR and obviously no VCC.

Thanx,

Bud

 

Won't work - the 730 cannot drive two TBI injectors.

Keep the 7747 and get RBob's EBL setup...

EdB

 

Thanx!
Will check it out

 

Well, I guess the first step is to download the appropriate wiring diagrams and make a pinout conversion chart. ftp://ftp.diy-efi.org/pub/gmecm/manuals/

I saw your other post about moving from the megasquirt to OEM ECM. I'm curious about the trouble you had with the megasquirt? If you don't want to rehash it, I understand.

 

Brent,

No problem re-hashing it. Fact of the matter is it is a really versitlie EFI--too versitile in fact. Bruce and Al have really done their homework and Lance, Scott, Eric and the many others who have had their hands in it have made it what it is today. It is always growing and improving and being improved upon. I have been a gear head since I was old wnough to walk and have seen alot of automotive evolution in those years. I am not in the mood to do endless tinkering any more and in this juncture of my life I just want to bolt in a "proven and reliable" system, not to say that the Megasquirt has not been so far by any means, but rather I just want to be done with the friggin' project. Going on two years now and I think enough is enough.

At first I got into the Megasquirt V2.2--that was over 2 years ago. Did an extensive retrofit into a 35-year old truck. I went the relay board and Megaview route (on board VFD display) and spent countless hours reading. tuning, tweaking, tweaking, tweaking,.....Okay, it runs pretty well although I still had yet to get the AE dialed in perfectly as it is a real PITA and is even more of one now but it ran at least. The original versions had 8x8 VE tables and no spark provision so I was runing a run-of-the-mill HEI. The truck got 1 MPG better and that was a plus since I do alot of driving during the summer. Primarily back to Texas every year to visit the folks and check on our properties. It was ONE BIG learning curve to say the least! I am still one of the cro-magnon Neanderthals that love Holley carbs..I have 3 on my 69 Super Bee!!

Now with the advent of MS-II I wanted to step up to the added benefits. Namely the IAC control and the expanded 12x12 tables and full spark control as well as the CAN Bus network for added flexibility not to mention the phenominal processor speed---hell, I'm still using a pair of TBI injectors and a manual tranny! Well, shortly before the swap I put in an Innovate WBo2 to make use of the future ability of target AFR tables and the "self tuning" capability. I had the wide band in sice last year already so I was using it to dial in my table (already at stoich) up to 16:1 by the push of a button...instant economy at cruise!! Nice!! Now with the AFR targets I can set the bins to what is really needed and keep it there across the board. But, along with this NEW improved version comes the new and improved pains in the rump! More tuning, driving, tweaking, tweaking, tweaking....Did I mention that I am done tweaking??

Anyway, since the swap to MS-II, I tried to communicate with the WB02 because I wanted to change some parameters because of a wild sweeping of the signal and that it was resting at 17.6 alot of the time and I wanted to see what was going on. Well, I could'nt get into it..I had to send it back to Innovate and they were gracious enough to send me a replacement. Great folks!! The IAC function has not worked correctly since the swap and I am using a standard GM in-line "o" ring stepper IAC. I have done everything that I know and nobody over at Megasquirt knows either and several people have had the same problems...I say back to the drawing board and fix the code--but that's me. I had sent the chip back to the guy I got it from (Glensgarage.com) who is a super person to deal with and I let him check it out. Maybe it's f'ed up from the get go-who knows. Don't have it back so I cannot get back to checking it out.

Anyway, the system is nice but as I stated in another post it is still "experimental" and is always being improved upon, added to and re-implemented. And because of that versatility I personally lose out on alot of "application specific" knowledge because somebody is trying to adapt it to their Stihl chainsaw or Buell Lightning and the "helpers" are being spread so thin trying to help those folks (who are deserving of it of course) and I cannot get my IAC issue resolved.

I just want to finish up this install and drive the damn thing!

This is what has brought me here. Anyway, before I go, I have a question about 2 other ECM's-
16196395 or
16197427
Will any one of these be better than my "7747" for a swap?
Thanx for letting me elaborate!
...Bud

 

Better yet is the EBL.
There's an ongoing thread discribing it's advantages.
In sort it cures some of the issues the GM TBI code has, and makes for an easier time in tuning. The included *paperwork* also goes into pretty good detail about what all the parameters mean, and do.

 

I have been reading ALL of the threads associated with RBob's EBL code and it looks like something that I may be interested in. If this helps me to get the truck running sooner and better I am in.

I will contact RBob about the stuff I need.

Thanx!
,Bud