TBI to TPI swap.
12-10-2005, 01:37 PM
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Car: 1992 Camaro Z28
Engine: 5.7 TPI L98
Transmission: 700R4
Axle/Gears: 3.23
TBI to TPI swap.
I was just wondering what parts are need to do a tpi swap. My uncle is junking his old Camaro and I told him to hold off until I know what parts are needed. I would switch the engines but his is also 305 so theres no point to do that. Thanks for any help.
12-10-2005, 04:36 PM
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Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
ECM, all it's affilated sensors, fuel system (including a new pump). Aside from the obvious...
12-11-2005, 06:13 PM
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Car: 1992 Camaro Z28
Engine: 5.7 TPI L98
Transmission: 700R4
Axle/Gears: 3.23
I'm suprised that you would have to change the fuel pump though. I would of thought that the output of the pump would be the same. (just my thoughts)
12-11-2005, 06:39 PM
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Car: 92 RS
Engine: a slow one
Transmission: a crunchy one
Axle/Gears: a whiny one
Originally posted by oifish
I'm suprised that you would have to change the fuel pump though. I would of thought that the output of the pump would be the same. (just my thoughts)
I'm suprised that you would have to change the fuel pump though. I would of thought that the output of the pump would be the same. (just my thoughts)
maybe they could've used the stronger TPI pump for both
but then you'd have a pretty hard working fuel regulator that would probably go out all the time
12-11-2005, 07:14 PM
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Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
TBI is designed for about 13 psi. TPI runs around 45. I don't see TPI limping on a TBI pump.
12-11-2005, 11:02 PM
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Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
A TBI pump is done at roughly 16 PSI, depending on the condition, age, etc. Running it over 15 PSI for any length of time will drastically shorten its life due to increased current draw across the brushes.
A TPI pump should have been put in these cars from the begining, but the TBI style pump was cheaper. If a TPI pump was overkill, why would they use it? GM should have run lots of fuel pressure on the TBI's for better atomization, better power, and better mileage. The Acceleration Enrichment would have been much stronger and response would have been better.
The regulator will not be overworked, unless you add a pump that can just put out too much volume. A few have had issues with the Walbro 255 on a TBI, most have not. Porting the return passageways alleviates this situation.
Long story short the TBI pump will not feed the TPI.
Why switch to TPI anyway? Sell the system on Ebay, get your bucks, then put the money where it counts. Improving the exhaust, bigger cam, replace the heads or port them to make them flow better, change to a projection intake, 454 TBI, computer tuning, etc.
A TPI pump should have been put in these cars from the begining, but the TBI style pump was cheaper. If a TPI pump was overkill, why would they use it? GM should have run lots of fuel pressure on the TBI's for better atomization, better power, and better mileage. The Acceleration Enrichment would have been much stronger and response would have been better.
The regulator will not be overworked, unless you add a pump that can just put out too much volume. A few have had issues with the Walbro 255 on a TBI, most have not. Porting the return passageways alleviates this situation.
Long story short the TBI pump will not feed the TPI.
Why switch to TPI anyway? Sell the system on Ebay, get your bucks, then put the money where it counts. Improving the exhaust, bigger cam, replace the heads or port them to make them flow better, change to a projection intake, 454 TBI, computer tuning, etc.
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