L98 Aftermarket EFI Controller/Ecu??
Melting Slicks
Joined: Mar 2002
Posts: 2,881
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From: Sligo PA
I could be wrong but on a 4+3 isn't the overdrive controlled by on/off outputs from the ECU? I don't think there's any PWM signal there. So almost any aftermarket ECU now a days can do that. It would be pretty easy to program one to operate the 4+3 overdrive. And even if I'm wrong and there are PWM solenoids in the 4+3 most aftermarket ECU's can do that too. You might not be able to get the cheapest ECU out there but it shouldn't be a problem.
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Joined: Jul 2010
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Well, thanks a bunch guys, both for the current info and thoughts, and the offer of future help. All my years of helping people in various forums coming back at me I guess. Thanks!
Yeah, any install info, like on the FiTech would be great, as you get it done.
That's a good point on the computer and 4 + 3. I hated the computer control on my overdrive, and wired mine up for manual only operation. But the computer might be very valuable to some future owner...
Vettepilot
Yeah, any install info, like on the FiTech would be great, as you get it done.
That's a good point on the computer and 4 + 3. I hated the computer control on my overdrive, and wired mine up for manual only operation. But the computer might be very valuable to some future owner...
Vettepilot
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Joined: Jul 2010
Posts: 97
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Ok, to clarify a couple things. One, I do not want computer control of the 4+3 overdrive. I converted that to manual operation long ago, and will have it that way for the big block swap as well. Also, in any case, no, it is not a PWM interface. It is just on/off. The computer grounds a relay that operates the overdrive. However, the computer does decide how/when to engage the overdrive in 2nd, 3rd, and fourth gears. Some may appreciate that function, but for myself I have no interest in it. I just want to select overdrive when I am on the highway in high gear. As mentioned though, some future "numbers correct" restorer might want the 4+3 computer.
Now, regarding the TPI 350 that will go into my 1994 pickup---> it will be humping a 4L60E trans. If whatever ECU I end up using can control that trans, great. I would be able to reprogram shift points which would be a welcome bonus. If not, then I will just piggyback the original pickup computer along with the new ECU, but have it control the trans only.
Vettepilot
Now, regarding the TPI 350 that will go into my 1994 pickup---> it will be humping a 4L60E trans. If whatever ECU I end up using can control that trans, great. I would be able to reprogram shift points which would be a welcome bonus. If not, then I will just piggyback the original pickup computer along with the new ECU, but have it control the trans only.
Vettepilot
