Engine swap
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Junior Member
Joined: Oct 2012
Posts: 7
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From: Ohare IL
Car: 87 trans am am gta
Engine: 350. 488 lift cam
Transmission: 700r4
Axle/Gears: 323 posi
Engine swap
After changing engine to Carb speedo does not work? Do I need computer anymore? Does the computer run gages? Please help
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iTrader: (1)
Joined: Sep 2009
Posts: 199
Likes: 1
From: Allegan, MI
Car: 89' camaro RS TTOP
Engine: 92 5.0tpi Bosch III, headers, msd
Transmission: 700r4 built. trans go. 2,300 stall
Axle/Gears: 3:73 posi ls disc brake conversion
Re: Engine swap
What year / car is this?
Member
Joined: Jun 2011
Posts: 198
Likes: 0
Car: 1991 Trans Am GTA
Engine: 350 carbed
Transmission: T5
Axle/Gears: 7.5 10 bolt 4.10
Re: Engine swap
I have my car switched over to carb and everything still works. i left my comp plugged in under the dash because of the vats system
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Member
Joined: Jun 2011
Posts: 198
Likes: 0
Car: 1991 Trans Am GTA
Engine: 350 carbed
Transmission: T5
Axle/Gears: 7.5 10 bolt 4.10
Re: Engine swap
Might make sure you didnt leave any grounds off if there was any. Pretty sure yours is electronic. Ive never had an older one
Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Engine swap
The VATS module on its own will still disable the starter relay; the module also sends a fuel enable signal
to the computer to pulse the fuel injectors which you don't have any more
In 90-92 TPI cars the computer is only needed to run the speedo
On earlier TPI and all TBI cars, the VSS signal from the trans goes to the speedo first then the computer
so the computer can be removed with a carb swap ( assuming you have rewired the fuel pump and fans as most do with a carb swap )
to the computer to pulse the fuel injectors which you don't have any more
In 90-92 TPI cars the computer is only needed to run the speedo
On earlier TPI and all TBI cars, the VSS signal from the trans goes to the speedo first then the computer
so the computer can be removed with a carb swap ( assuming you have rewired the fuel pump and fans as most do with a carb swap )
Last edited by vetteoz; Jan 7, 2013 at 06:01 AM.
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