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Addicted to TPI Torque

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Addicted to TPI Torque

Old 08-14-2005, 09:05 PM
  #1  
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Car: 91 Z28 All Original
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Addicted to TPI Torque

I have a 91 Z28 LB9 auto with 273 gears.
Now I know my car will not do impressive 0-60 or 1/4 mile times but in first gear when the rpm 2500 to 5000rpm it pulls real hard.
This makes it a lot of fun to drive around stop light to light.
On an average day I hit 5000rpm at least 10-20 times.I just love the feeling of torque and all credit goes to the TPI system designed more than 20 years ago.
What also amazes me is that as hard as I drive the engine-tranny don't seem to be getting any worse.
Just my 02.
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Old 08-14-2005, 09:38 PM
  #2  
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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
Well... 5000 rpm isnt torque. Thats horsepower bud.

But yes, tpis are alot of fun.
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Old 08-14-2005, 10:28 PM
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Car: 1991 Firebird Formula WS6
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Axle/Gears: 3.42's
isnt the crossover point from torque to hp 5250 rpm?
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Old 08-14-2005, 10:30 PM
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Car: 88 IROC, tpi, t top,
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I am 100% with you 91!!!! The now old school tpi has done nothing but impress me with high TQ and low HP. You buy TQ and race HP, more or less. TPI is fun stuff!
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Old 08-14-2005, 11:08 PM
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Car: 1992 Camaro RS
Engine: Yet another 350 TPI
Transmission: Borg Warner 6 spd
Axle/Gears: 3.73
Yup, Hp and Torque are equal at 5252 RPM.
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Old 08-15-2005, 12:03 AM
  #6  
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Car: 89 Iroc-z
Engine: Twin Turbo 401
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peak torque in TPI cars is around 3200rpms or so. from about 2600 to 4000 rpms TPI pulls its best. at about 3700 or so, torque is falling off fast and hp is taking over to about 4500rpms. after that, there isnt much anything, torque or hp. tpi doesnt like high rpms


but wiht 2800 stall, at the strip that TPI torque gets her off the line in a hurry. makes it look like a 12 second car but it only does 13.8-14.0's. LOL
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Old 08-15-2005, 10:04 AM
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Car: 1985 IROC
Engine: 305 TPI
Transmission: 700R4
It is kind of hard to compare Hp and Torque, since Hp is a derived from Torque.

I'm a big fan of the TPIs too!!!!
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Old 08-15-2005, 10:58 AM
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TPI=Torque Producing Injection

The first 3rd gen I ever drove was an '88 with a TPI 305 and an automatic. I couldn't believe a 305 could pull that strong. It was the only time I've ever been pulled over by the cops (no ticket though!)
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Old 08-15-2005, 10:02 PM
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[QUOTE]Originally posted by rcwest32
[B]TPI=Torque Producing Injection


I Like That!! Feel it in your pants, smell it from your tires!
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Old 08-15-2005, 10:09 PM
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Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
I like the look of TPI, but traded it in for a stealthram. Which for a while, pulled as hard as my TPI ever did, and pulled even higher up top.

Then the motor cooked a bearing after overheating (t-stat failed in a closed position) during a pass and that was all she wrote.

Now I'm selling all of my TPI stuff and going LT1 or maybe LS1 if I can be patient enough to gather the extra cash.

Then again, my old TPI setup wasn't a slouch down low.

AS&M semi-siamesed runners, ported base, ported plenum, ported heads, cam, headers, no cat, etc....

Too bad it wiped a bearing the first time at the track, never know how fast it could have gone.
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Old 08-16-2005, 04:15 AM
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theres nothing better than tappin that gas pedal in stop and go traffic and everyone around you watching you car rock up cause of the torque. It means a lot comming from a 91 celica 2.2L

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Old 08-16-2005, 04:27 AM
  #12  
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Car: 1989 Trans Am GTA
Engine: LT1, AFR 195cc, 231/239 LE cam.
Transmission: M28 T56
Axle/Gears: 3.23 10bolt waiting to explode.
My old TPI.
Attached Thumbnails Addicted to TPI Torque-426.jpg  
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Old 08-16-2005, 06:54 AM
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Just imagine a well tuned 406 under that TPI!! I know it would run out of breath quick, but damn wouldn't it put out some massive torque!
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Old 08-16-2005, 02:55 PM
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Originally posted by rcwest32
Just imagine a well tuned 406 under that TPI!! I know it would run out of breath quick, but damn wouldn't it put out some massive torque!
460 ft-lbs at the wheels to be exact But not well tuned
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Old 08-16-2005, 03:54 PM
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what rpm is that at? and whats the hp?
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Old 08-16-2005, 04:01 PM
  #16  
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Car: 91 GTA, 91 Formula, 89 TTA
Engine: all 225+ RWHP
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Yeah, it is fun lol

TPI does suck on anything past a 350 though :-( Thats the reason my 383 is going vortec Stealthram, I have to be a traitor on this one. Going to borrow some slicks to see how good it will go at the track for I swap it though.

My 383 in my Formie is just awesome, it will shift OD about 110 at WOT and just keep on pulling lol. Tach is barely climbing and the speedo just keeps knocking off higher and higher numbers lol

I just hate the fact that it is done at 4.8-5k, kind of like shutting off.

That one goes Stealthram

That GTA is staying stock TPI though, it is scheduled to undergo new valve springs and seals and a prototype GM TPI intake that I have managed to acquire :-) Should be interesting and best of all , it will still be factory :-) lol

later
Jeremy
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Old 08-16-2005, 04:06 PM
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tpi is more suited for a boat really:-/. yea it pulls awesome for what it is but yea... o yea torque is what gets u goin fast, hp is what keeps you there.
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Old 08-16-2005, 07:42 PM
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Originally posted by CheezX
460 ft-lbs at the wheels to be exact But not well tuned
460 ft-lbs @ 4000 rpm, 340 hp @ 4200 rpm. lol! But again, not well tuned, had a broken tranny crossmember and other major problems, thick blue/black smoke out the exhaust.
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Old 08-17-2005, 05:26 AM
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Originally posted by rcwest32
Just imagine a well tuned 406 under that TPI!! I know it would run out of breath quick, but damn wouldn't it put out some massive torque!
Nyuk nyuk I figured that Vortech SC in the garage would help push some air through the engine
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Old 08-17-2005, 09:37 PM
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Re: Addicted to TPI Torque

Originally posted by 91zzzeder
What also amazes me is that as hard as I drive the engine-tranny don't seem to be getting any worse.
Just my 02.
Thats what I used to say to my buddies till the whole thing grenaded. Just be prepared for it to happen
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Old 08-18-2005, 08:58 PM
  #21  
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Car: 91 Z28 All Original
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Re: Re: Addicted to TPI Torque

Originally posted by 85z28guy
Thats what I used to say to my buddies till the whole thing

grenaded. Just be prepared for it to happen

What specific part(s) broke on your Z28. I always thought Chevy small blocks were bullit proof.Not sure how tough the 700r4 is though.
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Old 08-18-2005, 10:32 PM
  #22  
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Car: 85' Z28
Engine: 383 roller
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I totally destroyed the 700r4. Like one minute it was perfectly, no signs of trouble. I took it to a very reputable shop, and he found me a core because he said there was like no good parts left in the tranny The motor was good tho, I just sent the balancer through the timing cover
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Old 08-19-2005, 09:40 AM
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Originally posted by rcwest32
Just imagine a well tuned 406 under that TPI!! I know it would run out of breath quick, but damn wouldn't it put out some massive torque!
You got that right!! Been there, done that...have since learned from my mistakes
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Old 12-22-2018, 10:53 AM
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Car: 90 Formula 350
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Re: Addicted to TPI Torque

WTH? sneezed and my post ended up on wrong thread
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Old 01-07-2019, 07:53 PM
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Re: Addicted to TPI Torque

Not only is the torque amazing. It's the prettiest motor out there, bar none.
More prettier than the plastic top motors.
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Old 01-07-2019, 09:26 PM
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Re: Addicted to TPI Torque

Well at least it looks like you’ve revived a particularly righteous thread!
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