PROM?
Joined: Jul 2000
Posts: 7,386
Likes: 1
From: In a mint Third Gen!
Car: Red 87 IROC-Z28 T-Top
Engine: 5.7 Tuned Port Injection
Transmission: 700R4 Auto
Axle/Gears: BW 9-Bolt 3.27
Do u want to make your own, or buy an already programmed 1??
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89 RS
Looking For:
87 IROC-Z28 350 TPI
[This message has been edited by IROCZTWENTYGR8 (edited June 06, 2001).]
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89 RS
Looking For:
87 IROC-Z28 350 TPI
[This message has been edited by IROCZTWENTYGR8 (edited June 06, 2001).]
Moderator
Joined: Jan 2000
Posts: 19,655
Likes: 309
86,
Your otherwise stock 305 TPI will react to the 180°F thermostat very well with the stock PROM. (Incidentally, Programmable Read Only Memeory module is not copyrighted, but a public domain acronym.) Any thermostat colder than that might start causing problems, since there are some programmed coolant temperature dependent parameters that have a threshold temperature of 176°F. The 180°F selection is a safe bet and good compromise year round.
As long as we're on the topic, if your TPI still has the stock PROM, you might want to check the TSBs from GM on the problems associated with it. There was a PROM re-write in November of 1986 that addressed some drivability and performance issues. I replaced mine with the upgrade and it performs better than it did with the Hypertech PROM I had installed (and removed) previously.
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Later,
Vader
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"Let the bodies hit the floor!"
Adobe Acrobat Reader
Your otherwise stock 305 TPI will react to the 180°F thermostat very well with the stock PROM. (Incidentally, Programmable Read Only Memeory module is not copyrighted, but a public domain acronym.) Any thermostat colder than that might start causing problems, since there are some programmed coolant temperature dependent parameters that have a threshold temperature of 176°F. The 180°F selection is a safe bet and good compromise year round.
As long as we're on the topic, if your TPI still has the stock PROM, you might want to check the TSBs from GM on the problems associated with it. There was a PROM re-write in November of 1986 that addressed some drivability and performance issues. I replaced mine with the upgrade and it performs better than it did with the Hypertech PROM I had installed (and removed) previously.
------------------
Later,
Vader
------------------
"Let the bodies hit the floor!"
Adobe Acrobat Reader
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