Hi,

Im pickin up a fuel injection setup of a 89, or 90 car not sure. What year did they change to speed density? Also are there anythings I should look out for?

they changed over to speed density in 1990

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*89 Trans Am GTA
*Moderator at www.transamgta.com

To hell with the GM vs Ford war. We must unite, as brothers to fight the plague that is overtaking the world...RICE

Tony

the got rid of the cold start valve in 89. just to let ya know. if that matters in ur case

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series Muffler added to Unkown CatBack, Ported Intake

http://www.geocities.com/david_angel_16

Hey,

Thanks for the replys. Didnt they add a 9th injector on speed density (not sure). Also should I use the stock distributor or can I use my hei with vacum advance?

If you plan to run TPI fuel injection, you must get the ECM, which also controls the distributor. You can tell if the TPI is a SD setup by looking at the back "passenger side" of the plenum for the spot that the MAP sensor bolts and connects to.

did they get rid of the cold start valve in 89? i have 3 tpi setups. the one on my 92z is speed density. now the other two are maf. one has a coldstart injector and i the other one doesnt.

As said before, no cold start injector in 89-up.

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System