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1986 IROC-Z28 305 TPI Mods Please Check

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Old 02-15-2005, 05:26 PM   #1
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1986 IROC-Z28 305 Mods Please Check

I have a 1986 305 TPI and wondered what i could do to it so far i have dremaled the Tune port out and added a Hypertech Power performer 3 chip and took out the ram air restricter plates out but would like to know what to do next i would say it would run in high 14's now and its an automatic..gets a mean 2nd to also have lightened the load a bit and fixin to have the Plentium ported and chromed or polished i was told that wood gain u 20 ponys and thinking of getting a better cam everyone says the stock cams are ****y but i dont know alot about raceing last time i race was back in high school at George Rays track in Paragould Arkansas its only 1/8 ..Thanks guys

Last edited by Hoppy72442; 02-18-2005 at 09:41 PM.
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Old 02-15-2005, 06:33 PM   #2
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Could you please use some punctuation in your next post. It is hard to read posts like that.

Start searching for TPI mods in the TPI forum. Spend some time reading various threads that focus on TPI cars.

Every car likes the same mods no matter who makes them.


It is up to you to make sure your fuel system and ignition system are up to snuff to supply your new power. If you swap cams you need to get into chip burning. The Hypercrap won't cut it.
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Old 02-16-2005, 05:03 PM   #3
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maybe you should go back to school and you might be able to spell stuff correctly or atleast get it close enough and not sound so stupid!!! just a suggestion not "wood" homeboy
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Old 02-16-2005, 06:56 PM   #4
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I would go with a mild cam, like the generic 204/214 dur @.050, .420/.442 lift cam that Summit and others sell for like $100. I ran that cam in my 86 305 and it will really wake the car up (to the tune of an honest 25+ hp at least...) and will work fine with the stock chip. If you're cheap like me you can also do the 25 cent FPR mod, ie throw a quarter in the top of the fuel pressure regulator above the spring assembly, it will effectively bump the fuel pressure by around 4-5 psi... Or you can buy a AFPR for $50 and bump the pressure that way.

Make sure you port/cleanup the plenum and stuff while you're at it if "dremaled the Tune port out" didn't include knocking down the EGR walls in the plenum and such.

After that I'd look to the exhaust, a set of headers and a catback would be excellent.

As your car sits I doubt very seriously you'd hit the 14s, you don't appear to have much in the way of mods at all, the Hypercrap will do jack, whatever dremeling you did won't do much at this point. After a cam and exhaust upgrade I'd be very surprised if you didn't drop your time considerably...

Last edited by Ray87Z; 02-16-2005 at 06:59 PM.
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Old 02-17-2005, 03:40 AM   #5
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Thanks Ray you've been the best help yet and Dan if u know what wood means then its great is this colleage son no it isnt so quit be so critasizeing this is where people can be themselves and talk about a hobby they love to do so shill if u have nothing to offer dont post silly stuff like that..TY And also i am gonna be driveing my camaro again T-Top got busted put another one in today cost me 75 from a camaro salvage yard i am gonna do some body work and get it ready to paint i havent chose yet if i am gonna paint it red like it was or go with black with the red interior any ideals ? Thanks all

Last edited by Hoppy72442; 02-17-2005 at 03:46 AM.
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Old 02-17-2005, 04:07 PM   #6
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huh? i cant see the point of this thread at all?
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Old 02-17-2005, 05:09 PM   #7
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I'm guessing that this was all in fun, and not necessarily intended to offend anyone. That would be my guess, anyway.

As for your question, Ray has it covered pretty well. The plenum volume is not nearly as important as the port matching at the runners and base. The factory did a rather poor job of that, and it can create a flow restriction. The other place to clean up is just behind the throttle body, at the intake openings of the plenum.

Adjusting the fuel pressure isn;t likely to help much until you do something about flow. That cam and a decent set of springs to match should improve upper end power and extend the useable RPM range a bit.

If you like to tinker a bit, you can make your stock FPR adjustable fairly easily. You might also consider a custom PROM in place of that HyperTech. Ray already covered that problem, too.
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Old 02-17-2005, 07:42 PM   #8
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Ok thanks for ur help
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