85/86 Jet Performance Question
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Instructor
Joined: Mar 2003
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From: Oneonta N.Y.
85/86 Jet Performance Question
Will a Jet Chip from a 85' work on my 86'(cast heads)? They both have the same tranny 4+3.... Jet part #18517? :confused:
[Modified by stock86vette, 7:54 PM 9/10/2003]
[Modified by stock86vette, 7:54 PM 9/10/2003]
Team Owner
Joined: Sep 2001
Posts: 62,157
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From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: 85/86 Jet Performance Question (stock86vette)
A chip will give you no HP gains, contrary to what they advertise.
However, the chip itself should work.
However, the chip itself should work.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Re: 85/86 Jet Performance Question (stock86vette)
I don't think that the 86 chip will work in the 85 car. The ECM hardware changed during the two model years. They went from a 1226870 to a 1227165 ECM.
I too doubt that the chip will give you any gains even if it will run the car. I checked the differences between a stock 1990 chip and one of their so called Stage 2 chips and the only thing I found different was that they added 2 to 3 degrees of timing in the timing maps. And this was suposed to be a custom chip that my friend paid $300 for! When he found out what I knew he was on the phone chewing some JET A**!
I too doubt that the chip will give you any gains even if it will run the car. I checked the differences between a stock 1990 chip and one of their so called Stage 2 chips and the only thing I found different was that they added 2 to 3 degrees of timing in the timing maps. And this was suposed to be a custom chip that my friend paid $300 for! When he found out what I knew he was on the phone chewing some JET A**!
Team Owner
Joined: Sep 2001
Posts: 62,157
Likes: 1,732
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
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Re: 85/86 Jet Performance Question (tjwong)
While they did change ECMs, the program is similar, I believe Marcho Polo used an 85 chip for my 86.
I do doubt that an 86 chip will work for an 85 though, be he's doing it the other way around.
I do doubt that an 86 chip will work for an 85 though, be he's doing it the other way around.
Burning Brakes
Joined: Jul 2002
Posts: 871
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From: Costa Mesa CA
Re: 85/86 Jet Performance Question (stock86vette)
Well...
I have an ADS chip in my '87 originally made for an '89 I bought new off EBay for $75.00. It works great! I think there's a lot more chips that can be switched in the different years than these chip burners would lead you to believe.
However, when I had my new cam installed with the motor rebuild, CompCam recommended an after-market chip for better driveability and idle.
FWIW,
BIG JIM
I have an ADS chip in my '87 originally made for an '89 I bought new off EBay for $75.00. It works great! I think there's a lot more chips that can be switched in the different years than these chip burners would lead you to believe.
However, when I had my new cam installed with the motor rebuild, CompCam recommended an after-market chip for better driveability and idle.
FWIW,
BIG JIM
