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Old 05-24-2006, 07:51 PM
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86 iroc z

does anyone know much about these cars. thanks joe

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Old 05-24-2006, 09:33 PM
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I have pretty good knowledge of them. Does it still have the TPI in it?
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Old 05-24-2006, 09:37 PM
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86 iroc z

yes it still has the tpi with the 305 motor, since the grille is so small and everything mechanically is working on the car how can i keep it cooler in traffic
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Old 05-24-2006, 09:40 PM
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First off Id flush the cooling system if you havent already. If you have, what mix of water to coolant are you running? What temp' thermostat are you running? What temp' are your fans kicking on at?
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Old 05-24-2006, 09:43 PM
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it has recently been flushed, it has all stock settings left on the car also is there a set of headers that will work on o2 sensors
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Old 05-24-2006, 09:51 PM
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K well these are things you need to reverify about the car. The didn't overheat from the factory so it should be apparent that something isn't working as well as it used to. Make sure the fan kicks on at the right temp and that the thermostat is opening up and at the 'stock' temperature. And what mix of antifreeze to water did the perosn use?


Yes, there are a variety of companies that make headers to fit that body style that will retain both the O2 and the AIR injection.

Check out www.thirdgen.org
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Old 05-24-2006, 09:56 PM
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86 iroc z

i bought the car from a lady about 4 weeks ago it appeared to be in excellent shape ,now the car did sit all last summer and winter in a garage so i presume that possibly the thermostat is sticking, her husband did all the maintence on the car before he left for florida now i reall dont know what mixture he used , thanks for the web site
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Old 05-24-2006, 10:20 PM
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If the air deflector on the bottom of the core support is missing, it will overheat.
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Old 05-25-2006, 01:04 AM
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The first thing to do is buy yourself a Haynes or Chiltern manual, I got both for my 86 Camaro coupe.
Do a tune up to get the car running properly, then you can start to modify it.
I started with a Hypertech chip / coil / 160 thermostat,MSD wires, Edelbrock intake (carbed motor) and Edelbrock headers.CompCams do cams to work with your ECM and they give some good low end torque.
I tried to go with things I could do on the weekend.
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Old 05-25-2006, 01:19 AM
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Malc had some good recommendations. I would hold off on the hypertech chip. Find a local tuner who can do a chip truly customized. I personally find hypertechs chips for these older TPI's to be a waste of money. They modify fan on temps, rev limiter, and in some cases up the maximum spark advance a bit. Other than that they are pretty basic. You should really get someone who can datalog and retune the ECM accordingly. Id find a guy, but wait until you have modded the engine to the extent that you know it needs a retune. I say this simply to save money. Or if you'd like you can purchase the equipment and do it yourself like I did .
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Old 05-25-2006, 02:35 AM
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Plenty of 305 tips here.
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