ECM Upgrade for CFI
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
The ECM in the L83 is just as "fast" and "advanced" as other L98 ECM's. I believe "69427" on this forum has hacked and studied the ECM in the '84 and made those observations. The problem w/the CFI ECM is that it isn't readily "hackable" and there aren't tools to interface with it. THAT is the primary reason why people switch to newer, more common ECM's.
Cruising
Joined: Jan 2012
Posts: 13
Likes: 0
From: Texas
Why ask the question then?? The LT1 is a bit of a stretch due to an very different ignition system, but the L98 is fundamentally very similar to the CFI and it can work. In fact, I believe QWS on ths forum has already done that conversion.
Doesn't matter. It's already been done (massively ported intake) and then the addition of bored out TB's...didn't do one wit for power. Stock TB's are more than enough for a stock or stockish engine.
That's important...and a lot different than, "I know the stock ECM needs to be upgraded if I want to have my throttle bodies bored to 2" and install TJ25 (68lb/hr) injectors"...which is what you said in your first post.
The ECM in the L83 is just as "fast" and "advanced" as other L98 ECM's. I believe "69427" on this forum has hacked and studied the ECM in the '84 and made those observations. The problem w/the CFI ECM is that it isn't readily "hackable" and there aren't tools to interface with it. THAT is the primary reason why people switch to newer, more common ECM's.
probably not a limiting factor on the 350 that you're talking about. I'd bet that the intake will still be your limiting factor.
Probably, since you're doing cam and heads.
That is what I would do. That is what I DID with my 400, and ended up not needing ECM/Tuning. MY results were ~300 chp, stock like idle, great drivability and 24 mpg hwy. That was acceptable..."good enough". I used the 90 pph injectors and a vacuum referenced fuel pressure regulator from a marine application TBI to lower fuel at idle/cruise and it worked great. IF it hadn't worked out that way, THEN I would have proceeded down the ECM/tuning road.
Doesn't matter. It's already been done (massively ported intake) and then the addition of bored out TB's...didn't do one wit for power. Stock TB's are more than enough for a stock or stockish engine.
That's important...and a lot different than, "I know the stock ECM needs to be upgraded if I want to have my throttle bodies bored to 2" and install TJ25 (68lb/hr) injectors"...which is what you said in your first post.
The ECM in the L83 is just as "fast" and "advanced" as other L98 ECM's. I believe "69427" on this forum has hacked and studied the ECM in the '84 and made those observations. The problem w/the CFI ECM is that it isn't readily "hackable" and there aren't tools to interface with it. THAT is the primary reason why people switch to newer, more common ECM's.
probably not a limiting factor on the 350 that you're talking about. I'd bet that the intake will still be your limiting factor.
Probably, since you're doing cam and heads.
That is what I would do. That is what I DID with my 400, and ended up not needing ECM/Tuning. MY results were ~300 chp, stock like idle, great drivability and 24 mpg hwy. That was acceptable..."good enough". I used the 90 pph injectors and a vacuum referenced fuel pressure regulator from a marine application TBI to lower fuel at idle/cruise and it worked great. IF it hadn't worked out that way, THEN I would have proceeded down the ECM/tuning road.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
You're not going to need a bigger injector w/an intake and mild cam upgrade. You can increase your fuel pressure by morifying the stock regulator.
For a cam, I'd recommend something in the stock duration range; ~210@.050, w/as much lift as you can get, for the duration. 1.6 rockers would be an easier solution.
Where did you find the Renegade in stock?
Your proposed mods are good ones; they'll make a difference. Exhaust from the heads back would help a lot too.
For a cam, I'd recommend something in the stock duration range; ~210@.050, w/as much lift as you can get, for the duration. 1.6 rockers would be an easier solution.
Where did you find the Renegade in stock?
Your proposed mods are good ones; they'll make a difference. Exhaust from the heads back would help a lot too.
Cruising
Joined: Jan 2012
Posts: 13
Likes: 0
From: Texas
You're not going to need a bigger injector w/an intake and mild cam upgrade. You can increase your fuel pressure by morifying the stock regulator.
For a cam, I'd recommend something in the stock duration range; ~210@.050, w/as much lift as you can get, for the duration. 1.6 rockers would be an easier solution.
Where did you find the Renegade in stock?
Your proposed mods are good ones; they'll make a difference. Exhaust from the heads back would help a lot too.
For a cam, I'd recommend something in the stock duration range; ~210@.050, w/as much lift as you can get, for the duration. 1.6 rockers would be an easier solution.
Where did you find the Renegade in stock?
Your proposed mods are good ones; they'll make a difference. Exhaust from the heads back would help a lot too.
