TPI Throttle bodys

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Dec 7, 2003 | 02:53 PM

Brian Felts

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Joined: Jul 1999

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From: Chillicothe Ohio

Car: 89 RS 355/ 89 IROC Convert

Engine: Hot Cam 355/TPI 305

Transmission: All 700r4's

TPI Throttle bodys

What is the difference between the 85 to 88 throttle bodys from th 89 up units.

Thanks
Brian Felts

Dec 7, 2003 | 02:55 PM

DJP87Z28

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Joined: Mar 2003

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From: Florida

Car: 1987 Black IROC-Z (SOLD)

Should be the same 48mm TB on all TPI's over the years.

Dec 7, 2003 | 02:57 PM

Brian Felts

Thread Starter

Senior Member

Joined: Jul 1999

Posts: 760

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From: Chillicothe Ohio

Car: 89 RS 355/ 89 IROC Convert

Engine: Hot Cam 355/TPI 305

Transmission: All 700r4's

they list the aftermarket ones for 88 and back then 89 up.

Thanks
Brian

Dec 7, 2003 | 03:18 PM

biggtime

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there are 2 differences.
1) the linkage
the early ones used the direct pull method
the later ones used the smoother radiused pull.
2) how the IAC pulls its air
the early Tb's used a port in the plenum directly behind the tb.
the later had a slot milled betweeen the tb blades.