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Old 09-23-2004, 09:02 AM
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305/350

Hey guys, is there a difference between a Tune Port Injection System for a 305 and 350? If so what are the differences, wiring? size? etc. Is it possible to use one on the other? How difficult is installation, or fairly straight forward?
Thanks for what ever help you can provide.

Daniel

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Old 09-23-2004, 12:52 PM
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Same unit other than the ECU chip. 350 version came with different injectors as well I believe. The 305 to 350 are 100% interchangeable.

The TPI's were originally designed for the 305 hence they somewhat held back potential performance on the 350's.

Installation is pretty straight forward. It depends on what your putting it on though. You'll have to run a return line to the fuel tank, a high pressure inline pump, rig up all the wiring, sensors, probably get a custom chip for your setup.

Tell us what your putting it on and then I can get more specific on what needs to be done.
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Old 09-24-2004, 06:40 AM
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I'm putting the TPI on a 350 in a 69 C-10, pickup. I'd like to find a wrecked Iroc, and have been searching the local salvage yards but have not found anything. Id like to have the transmission also and whatever knick knacks I can get from it.

Daniel
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Old 09-24-2004, 12:35 PM
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Transam's of the same era also had TPI's in them.

I obtained the majority of my stuff on ebay and then went with an aftermarket wiring harness and computer/chip.
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Old 09-25-2004, 07:45 PM
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Years ago I had an 87 IROC that came with a (mass air) TPI 305. I cracked one of the heads and decided to put a 350 long block (for an 87 1/2 ton pickup) as a replacement. It ran perfect with the stock chip and 50 psi of fuel pressure. Later I put in a different cam (approx. 207/214 at .050, .435 .465 lift, 112 lsa) and headers with 3" exhaust and it started to surge at idle and occasionally stall, so I had a chip made and no more problems. I found it interesting that the chip gave no gains in ET even though it was a custom "performance" chip from AS+M.
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Old 09-26-2004, 08:05 PM
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For the most part I find lately chips are being overhyped.
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Old 09-27-2004, 12:22 AM
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I have an 86 IROC, had a 'performance' chip in it, All it did was dump more gas in. Chips for some cars do wonders. Chips for other cars are just marketing gimics. A stock TPI setup on a 350 will end up choking the power output quite a bit. As opposed to other setups you could have on there. If you get everything ported/polished and siamesed runners, It will open it up alot more. And you'll also need to work out a ram air system for it if you can, just so it can get the air its lacking. I know theres alot of room infront with the C-10s, not sure about ducting though.
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Old 09-27-2004, 04:33 PM
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Like I said, stock TPI's were designed for the 305 and on a 350 they can really use the aftermarket mainfold and runners. You should still see some gains with it but more can be done to maximize performance out of them.
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Old 09-27-2004, 05:13 PM
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I'm not sold on the siamesed runners, etc. I recall on a 12 sec car, the aftermarket pieces (totalled $1100-$1200 for a base, throttle body, and runners) were only worth .2 in the 1/4 mile. Either build the motor to stay approx. 5000 rpm or less, supercharge it, or get a completely redesigned intake (i.e. SuperRam).
My personal preference would be a centrifugal supercharger.
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Old 09-28-2004, 08:36 PM
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Siamesed runners increase topend power and RPM whereas the large tube runners are more geared towards low end torque gains.
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