Do I need to change PROM for a 700R4 to T5 conversion?
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Supreme Member
Joined: Jan 2000
Posts: 1,180
Likes: 82
From: Mississauga, Ontario Canada
Car: 1987 GTA
Engine: 5.7
Transmission: T5WC
Axle/Gears: 3:27
Do I need to change PROM for a 700R4 to T5 conversion?
I'm getting conflicting results from my searches. Does the PROM need to be changed for this swap? Its my understanding that the ECM doesn't care what transmission is in the car, as it only controls the engine, and as far as the transmission, just converter lock up. If this is the case, why would the PROM need attention? Its still controlling the same engine. I was just about ready to make a purchase on the T5, then I ran into this. To be honest, if I have to start messing around with the ECM I'll likely stay with the 700. Unless I'm really over thinking this.
Joined: Mar 2006
Posts: 4,369
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Car: 1973 Datsun 240Z/ 1985 S-15 Jimmy
Engine: Turbo LX9/To be decided
Transmission: 5-speed/T-5
Axle/Gears: R200 3.90/7.5" 3.73
Re: Do I need to change PROM for a 700R4 to T5 conversion?
Just because it's an engine controller does not mean that the transmission doesn't matter.
There are differences in the way the engine will run and react to throttle input and vehicle motion between automatic and manual transmissions. The TCC as you said is also a different portion of the way the ECM will control the drivetrain. The manual trans equipped vehicle has no need for a TCC, so this output is used for the (economy) shift light.
There are slight differences in IAC logic, and some other small differences that oevrall add up.
Most people find that when they use auto PROMs on a manual trans equipped vehicle that stalling when coming to a stop is common, some idle issues can also show up.
As long as everything is stock, you would be able to get away with a simple swap of the MEMCAL/PROM, to a proper manual trans calibration for your car with matching gear set.
There are differences in the way the engine will run and react to throttle input and vehicle motion between automatic and manual transmissions. The TCC as you said is also a different portion of the way the ECM will control the drivetrain. The manual trans equipped vehicle has no need for a TCC, so this output is used for the (economy) shift light.
There are slight differences in IAC logic, and some other small differences that oevrall add up.
Most people find that when they use auto PROMs on a manual trans equipped vehicle that stalling when coming to a stop is common, some idle issues can also show up.
As long as everything is stock, you would be able to get away with a simple swap of the MEMCAL/PROM, to a proper manual trans calibration for your car with matching gear set.
Thread Starter
Supreme Member
Joined: Jan 2000
Posts: 1,180
Likes: 82
From: Mississauga, Ontario Canada
Car: 1987 GTA
Engine: 5.7
Transmission: T5WC
Axle/Gears: 3:27
Re: Do I need to change PROM for a 700R4 to T5 conversion?
Just because it's an engine controller does not mean that the transmission doesn't matter.
There are differences in the way the engine will run and react to throttle input and vehicle motion between automatic and manual transmissions. The TCC as you said is also a different portion of the way the ECM will control the drivetrain. The manual trans equipped vehicle has no need for a TCC, so this output is used for the (economy) shift light.
There are slight differences in IAC logic, and some other small differences that oevrall add up.
Most people find that when they use auto PROMs on a manual trans equipped vehicle that stalling when coming to a stop is common, some idle issues can also show up.
As long as everything is stock, you would be able to get away with a simple swap of the MEMCAL/PROM, to a proper manual trans calibration for your car with matching gear set.
There are differences in the way the engine will run and react to throttle input and vehicle motion between automatic and manual transmissions. The TCC as you said is also a different portion of the way the ECM will control the drivetrain. The manual trans equipped vehicle has no need for a TCC, so this output is used for the (economy) shift light.
There are slight differences in IAC logic, and some other small differences that oevrall add up.
Most people find that when they use auto PROMs on a manual trans equipped vehicle that stalling when coming to a stop is common, some idle issues can also show up.
As long as everything is stock, you would be able to get away with a simple swap of the MEMCAL/PROM, to a proper manual trans calibration for your car with matching gear set.
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