TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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IAC and the the screw...

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Old Aug 27, 2001 | 08:15 PM
  #1  
lostangel's Avatar
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Joined: May 2001
Posts: 58
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From: Columbus, Ohio, USA
Car: 86 Z28
Engine: 305TPI stock
Transmission: TH700R stock
IAC and the the screw...

Well lets just say i started mesing around with the car before I had any idea what TPI stood for now I'm a bit more educated and wanted to know if it's possible to find that "original" setting for the minimum air screw? Anyone know this one?

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86 Z28
305TPI
Stock, but with potential!
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Old Aug 27, 2001 | 09:52 PM
  #2  
dgreene's Avatar
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Joined: Jul 2001
Posts: 43
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Car: 87 Formula 350
Engine: 350
Transmission: 7004R
Try this page.... When I started tunning on my '87 350 TPI this really made a difference in my off idle performance.

https://www.thirdgen.org/newdesign/tech/tpimod2.shtml

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dgreene
'87 Firebird Formula 350 TPI, Ported Plenum, Adj. Fuel reg, gutted cat, catback exhaust, air foil, K&N air filter, chip,170 thermostat,Borg Warner Posi 9 Bolt w/ 3.23 gears....soon to be making custom chips for this and my 87' GN
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