TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
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Old 12-19-2005, 12:42 AM
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Car: 91 formula
Engine: 350 tuned port. bolt ons
Transmission: 700r4
Axle/Gears: 3.73
air foil

do u think they really work. should i get one this year
Old 12-19-2005, 10:46 AM
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Car: 94 S10 soon to be 305TBI, 01 Blazer
Engine: 4.3 TBI, 4.3 CPI "01 Blazer"
Transmission: 4L60E's
I Definitly Recomend them! I bought a TPIS Unit and noticed a difference, Car seemed to have more pull to it.

Last edited by TPIFormula; 12-21-2005 at 02:16 PM.
Old 12-19-2005, 10:48 AM
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Car: 91 GTA, 91 Formula, 89 TTA
Engine: all 225+ RWHP
Transmission: all OD
Axle/Gears: Always the good ones
Mentally they work fantastic :-)

Physically a lot less so :-)

They are worth doing if u get your hands on one cheap, other than that for the $50 they want now, I would save it for better things

later
Jeremy
Old 12-19-2005, 11:48 AM
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Car: 1988 Camaro IROC-Z
Engine: 350 TPI (L98)
Transmission: T56
Axle/Gears: 9-bolt 3.45
If you plan on purchasing any aftermarket throttle body in the future, don't spend the cash as it can't be used with them.

In threory the could help out a lot, but you will get more gain by saving/spending the cash elsewhere, such as headers, heads, intake, camshaft, the list goes on. Wait until you are making 350hp then you will need one...but by that time, you will need to start looking into a larger aftermarket throttle body anyway.

With that said, if you can find one for a dang good price, then sure, every little bit counts.
Old 12-19-2005, 01:19 PM
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Car: '91 Z28
Engine: L98 5.7L TPI
Transmission: 700R4
Axle/Gears: 323's
well, i have a TPIS one if'n you're interested - $25 shipped in the 48...
Old 12-19-2005, 02:46 PM
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Car: 92'Camaro RS
Engine: a loud one
Transmission: bolted to the engine
Mentally they work fantastic :-)
I just put one in last month...definitly didn't feel a difference. Again if you gain 1 hp out of it( if you're lucky),you're not going to feel that anyways.

They are worth doing if u get your hands on one cheap, other than that for the $50 they want now, I would save it for better things


I would never spend $50 bucks for one of these, nor $38. I only picked one up cause someone on ebay was selling them for $15 + $5 for shipping
Old 12-19-2005, 07:08 PM
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Car: 1988 Corvette
Engine: 5.7L TPI L98
Transmission: 700R4
Axle/Gears: D36 2:59
I'd slap one on a ported out pleuim base and runner setup. but pure stock i would't bother waste of time IMO.
Old 12-19-2005, 07:18 PM
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Car: 1987 IROC-Z Camaro
Engine: 5.7 350 TPI - SLP Runners, AFPR, MSD Goodies
Transmission: 700R4 - Shift Kit, Corvette Servo
Axle/Gears: BW 9 bolt, 3.27s
spend the 50 bucks on gasket material and die bits to port your plenum.
Old 12-19-2005, 07:35 PM
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Car: projects.......
Old 12-19-2005, 10:35 PM
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Car: 91 formula
Engine: 350 tuned port. bolt ons
Transmission: 700r4
Axle/Gears: 3.73
am asking because i saw them on ebay for 10 -15 bucks. that is very cheap for them. and it comes with a gasket for the throttle body plate. i plan on puting a new plate on their soon like one that says formula or something cool
Old 12-20-2005, 12:03 PM
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Car: 1988 Corvette
Engine: 5.7L TPI L98
Transmission: 700R4
Axle/Gears: D36 2:59
Get it home skillit thats cheap as hell.
Old 12-20-2005, 02:02 PM
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Car: 1988 Pontiac Trans-AM
Engine: TPI 350 (5.7L)
Transmission: 700R4
I got one from a friend who went with a larger throttle Body, didn't feel any differance.

latter, I had my TB rebuilt and bored to 52mm with the airfoil on. Also, added the slp runners and port matched them at the same time. With the other upgrades there was a real "seat of the pants" gain (see sig)

With all my upgrades, The free flowing exhaust system was the best money spent.

If you can get the air foil cheap, Why not?
Old 12-21-2005, 01:10 PM
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Car: 1988 Corvette
Engine: 5.7L TPI L98
Transmission: 700R4
Axle/Gears: D36 2:59
Roads88 you should have ported your base when you ported out the pleuim and runners. Base is so very very restrickive its a joke. I went nuts on my base more then anything else. Plueim i port match and cleaned the egr walls, and runners i just touched up the lip.
Old 12-21-2005, 04:39 PM
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Car: 1988 Pontiac Trans-AM
Engine: TPI 350 (5.7L)
Transmission: 700R4
Yeah...it was a time and money issue. If and when i get the money together, a procharger is going on.

I'l force feed the sucker

The Griffin radiator in my mods list is the first step in that direction.

Last edited by Roads88; 12-21-2005 at 04:43 PM.
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