Converting from TBI to TPI, VSS question.

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01-02-2010, 10:27 PM

quick90rs

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Car: 1990 Camaro RS

Engine: 350 Vortec Demon 650CFM

Transmission: 700R4

Axle/Gears: Posi

Converting from TBI to TPI, VSS question.

I am converting my 90 TBI camaro to TPI using an 89 TPI setup, the speed sensor from my 90 is different right? I think i need to buy this part http://tpiparts.net/inc/sdetail/7586 How would this install and is it difficult? Thanks

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01-02-2010, 10:42 PM

vetteoz

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Car: 82 Z28

Engine: 383 SP EFI/ 4150 TB

Transmission: T400

Axle/Gears: QP 9" 3.73

Re: Converting from TBI to TPI, VSS question.

That adapter is for getting a VSS signal off a car with cable drive speedo .Could use it but could just go to a wrecking yard and get a VSS unit for 89 or earlier to suit your new ECM
The signal changed in '90 to the 4000 pulse you have now from the 2000 pulse