ECM upgrade (1227730) for stock 2.8 (Page 3/107)
F-I-E-R-O JAN 11, 07:01 AM
I'd be willing to pay for beggining to end instructions on completing this project!

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Please Visit My Fiero Store Thanks!

Fierobsessed JAN 11, 07:57 AM

quote
Originally posted by Darth Fiero:

The 7730 ECM also mounts inside the Fiero using a stock, early 4cyl ECM mounting tray.




Actually it's the 87-88 4 Cyl tray. But yea, In all reality, you could provide a "kit" with the third connector, explicit wiring instructions, the speedo adaptor circuit, the EGR and Fan and Knock sensor whip's, an ECM and a chip, burnt to match, and if a 3.4 engine is installed (or any engine with the crank sensor) an adaptor cable from the Distributor to the DIS (they use almost the same wiring anyway, just a different connector).


I've done this swap myself too, but I never went all the way to insure that all pieces of the puzzle were in place, So I never had good results.

One more little thing to add... it is possible, though it would need a lot of tuning, to run the 3.4 DOHC with exactly this configuration, and make it so it's compatible with boost. And it can be done with what is mostly a 2.8 Fiero harness!
Darth Fiero JAN 11, 11:31 AM

quote
Originally posted by Knight:

That 2.0L. Is that the one in the late '80s Sunfire and Cavalier?
How different are the 3.1 and Carmaro 3.4 compared to the 3100 and 3400. Were the 7730/7727 used on the aluminum headed 3.1?




The 7730/7727 ECMs were used with the aluminum-headed 2.8's and 3.1's. The 7730 was used with the iron-head 3.1 in 90-92 Camaros and Firebirds.

The 3100 and 3400 engines have aluminum heads and roller camshafts. All 3400's, and later models of the 3100's had roller rocker arms. The "standard" aluminum-headed 2.8's and 3.1's did NOT have roller cams nor roller rocker arms. The 90-92 Camaro 3.1 is virtually identical to the Fiero 2.8; iron heads, standard flat-tappet cams and non-roller rocker arms. The 93-95 Camaro 3.4 SFI had iron heads and also did not have roller cams or roller rocker arms BUT it was set up for DIS ignition.

The 1st generation aluminum head 3.1 made about 135-140 rated hp.
The Camaro 3.4 SFI V6 only made 160hp.
The 3100 made 160-175hp depending on year.
The 3400 made 170-185hp depending on vehicle.

more info on GM engine specs can be found on my website at: http://dtcc.cz28.com/gminfo.htm

-ryan
Knight JAN 11, 12:14 PM
I'm getting excited at the possibility of putting a 3.4 or a 3400 with 4-speed auto. I want to upgrade my current ECM in my 86 2.8. and place an upgrade engine /transmission in my engineless 88.
PhatMax JAN 11, 12:17 PM
I second the motion to make a kit to install this in a stock 2.8. or complete step by step instructions.
Knight JAN 11, 03:03 PM
I third that. Either for a kit to use a 7730 that is already obtained or to buy a 7730 or similar already modified with needed items to plug and play with instuctions and with option of EGR "kit".
87SEV6Reborn05 JAN 11, 05:01 PM
Nice upgrade, better get me that ECM I ran across last week. awaiting another update
Mike Murphy JAN 11, 05:10 PM
Hey Darth! Good work. Now I know what I need to do with my 3.1 stroker. My son recently junked an 89 GP with a 3.1 so I guess I'll go to the yard and yank the ecm and tranny along with the DIS & egr. One thing that has constantly driven me nuts is the hunting idle on the damn thing. Sounds like this might be a good cure. Still won't be as much fun as my dohc 3.4 though.

See ya

Murf
Darth Fiero JAN 11, 07:32 PM

quote
Originally posted by Mike Murphy:

Hey Darth! Good work. Now I know what I need to do with my 3.1 stroker. My son recently junked an 89 GP with a 3.1 so I guess I'll go to the yard and yank the ecm and tranny along with the DIS & egr. One thing that has constantly driven me nuts is the hunting idle on the damn thing. Sounds like this might be a good cure. Still won't be as much fun as my dohc 3.4 though.

See ya

Murf



Just remember that 7727 that was used in the 89 GP uses different type wiring terminals than what the 7730/stock Fiero 2.8 harness uses so extra work would be required to use a 7727 ECM vs. just getting a 7730 ECM.

As for the KIT question, I will look into it, but to be quite honest, I don't think there is going to be an easy plug-and-play solution. For one thing, there isn't much room in the stock ECM location in the Fiero for a conversion harness with connectors for both the new ECM and the Fiero harness. I could probably put together a repinning and wiring instruction sheet and post it on my website for download but anyone wishing to do this conversion would need to obtain their own 7730 ECM and connectors (with some wiring) and then do the necessary wiring and repinning work themselves. Unless of course they were willing to bring the car to my shop in which case I could do the conversion for a nominal fee.

[This message has been edited by Darth Fiero (edited 01-11-2007).]

oliver2245 JAN 11, 08:01 PM
I to am interested in this up grade when do you think you will post it thanks