L98 in C3, ECM options?
Thread Starter
Racer
Joined: Sep 2022
Posts: 338
Likes: 67
From: Escondido, CA
L98 in C3, ECM options?
Been lurking for a bit during the winter. I’m rebuilding my ‘88 L98 and happened upon another, which I’m building out to a 383 stroker w/ Edelbrock manifold & runners and AFR 190 heads. I was looking for a home for the 383 and and found a 69 convertible. So now I can also add some long tube headers (California doesn’t require smog pre-71) and cam.
So I’m looking at what it will take to drop this in the 69 and the one thing I’m not sure on is the ECM. I don’t have one.
One guy in CF:C3 suggested EZ EFI 2.0 Retro. Looks good but kind of a high price tag and currently out of stock. What are my other options? Know of anyone who has dropped an L98 into a much older Vette?
So I’m looking at what it will take to drop this in the 69 and the one thing I’m not sure on is the ECM. I don’t have one.
One guy in CF:C3 suggested EZ EFI 2.0 Retro. Looks good but kind of a high price tag and currently out of stock. What are my other options? Know of anyone who has dropped an L98 into a much older Vette?
Le Mans Master
Joined: Aug 2017
Posts: 6,943
Likes: 1,490
From: New Jersey
I personally can't reccomend the fast unit, seen a friend go through 6 ECMs in 2 years. Maybe something like a megasquirt or microsquirt. I suppose you could also use an oem ECM or modified like an EBL and just trim back an OE harness and tune that way too. If you want to be able to have someone tune it though you'd be better off with a universal Holley or the Fast unit. Beyond that not a lot of people are willing to touch other software.
Burning Brakes
Joined: Oct 2017
Posts: 823
Likes: 106
From: Somewhere near Fort Wayne, Indiana
I wouldn't say that any ecm will run it, some are mass air flow and others are manifold desity, not to mention, there may be differences in pinouts. What I would do is find aTPI ecm with a matching harness and have it modified (www.dynamicefi.com, aka EBL) You'll get the reliablility and simplicity of a stock ECM with the ability to flash tune like a modern ECM.
