87 Wiring Harness vs 88 Wiring Harness???
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Joined: Jul 1999
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From: Midwest City, Ok, USA
Car: 98 Z28
Engine: LS1
Transmission: T56
Axle/Gears: 3.42
87 Wiring Harness vs 88 Wiring Harness???
87 TPI 305 car. Going to swap a TPI 350 from an 88 car into the 87. Can I just change the CPU and injectors or do I have to swap the whole engine harness from the 88 into the 87?
Please help!
Please help!
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Joined: Sep 2000
Posts: 6,775
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From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
If you're re-using the '87 TPI, an injector swap, prom for a 305 and a different knock sensor are the only things that come to my mind that have to be changed.
The only difference I can think of between the 2 years is 88, the secondary fan operates with the primary when the A/C is turned on. '87, just the primary (ECM controlled) fan runs with the A/C. '88 also got new (or, I guess, updated would be more correct)relays.
The only difference I can think of between the 2 years is 88, the secondary fan operates with the primary when the A/C is turned on. '87, just the primary (ECM controlled) fan runs with the A/C. '88 also got new (or, I guess, updated would be more correct)relays.
Thread Starter
Member
Joined: Jul 1999
Posts: 137
Likes: 0
From: Midwest City, Ok, USA
Car: 98 Z28
Engine: LS1
Transmission: T56
Axle/Gears: 3.42
Originally posted by deadbird
If you're re-using the '87 TPI, an injector swap, prom for a 305 and a different knock sensor are the only things that come to my mind that have to be changed.
The only difference I can think of between the 2 years is 88, the secondary fan operates with the primary when the A/C is turned on. '87, just the primary (ECM controlled) fan runs with the A/C. '88 also got new (or, I guess, updated would be more correct)relays.
If you're re-using the '87 TPI, an injector swap, prom for a 305 and a different knock sensor are the only things that come to my mind that have to be changed.
The only difference I can think of between the 2 years is 88, the secondary fan operates with the primary when the A/C is turned on. '87, just the primary (ECM controlled) fan runs with the A/C. '88 also got new (or, I guess, updated would be more correct)relays.
When does the secondary fan kick on for the 87? I need to keep it running cool.
TGO Supporter
Joined: Sep 2000
Posts: 6,775
Likes: 27
From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
The secondary fan is strictly fan switch controlled (at least it was on my '87) and the oem fan switch is 238° (oddly, the primary fan control for the TBI cars).
The way I did mine was to buy a JET fan switch (200° on, 185° off) and make the secondary fan the primary. The ECM controlled fan is not the secondary which is kicked on a 220°-ish (off around 205-210°).
The '88 is the same with the exception of the A/C will just kick on both fans instead of just the primary. IT still uses a 238° fan switch during normal operation.
Other than injectors, the intake for 305 & 350 is 100% the same.
Also, unless you're planning on a pretty hot setup on the 350, the stock MAF prom is pretty forgiving on a modded motor.
All just my opinion and fuzzy memory granted
The way I did mine was to buy a JET fan switch (200° on, 185° off) and make the secondary fan the primary. The ECM controlled fan is not the secondary which is kicked on a 220°-ish (off around 205-210°).
The '88 is the same with the exception of the A/C will just kick on both fans instead of just the primary. IT still uses a 238° fan switch during normal operation.
Other than injectors, the intake for 305 & 350 is 100% the same.
Also, unless you're planning on a pretty hot setup on the 350, the stock MAF prom is pretty forgiving on a modded motor.
All just my opinion and fuzzy memory granted
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