GM's Return to Performance: Tuned Port Injection
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- čas přidán 7. 09. 2024
- In this video we'll be talking about General Motors' Tuned Port Injection system. This could be found on 1985 through early 90's C4 Corvetts equipped with a 350, and Chevrolet Camaros and Pontiac Firebirds equipped with a 305 from 1985 onward, and 350 cubic inch engines from 1987 until 1991.
I have owned my 1987 Iroc-Z 5.7L now for 28 years, running 100% stock, 82k no issues 👍
Probably the coolest looking induction system ever.
It was an amazing experience seeing those back in the day and you could feel the torque
My parents bought a 1993 Olds Cutlass Supreme and even the the 3.1 engine has enough torque to notice being pushed back into the seats. On a test drive as a kid, my mom was used to lethargic malaise era cars where large throttle inputs didn't do much. We drove that Olds and when she stepped on it you could FEEL the torque.
mine had 345 ft lbs
Best looking intake
100%
@@rporestorations the only one better looking is the lt5
Love this intake. I rebuilt the top half with new injectors,tore down the fuel rail replaced all the o rings ,new fuel pressure regulator cleaned out all the carbon from intake plenum and runners new gaskets,cleand throttle body and a good tune up and wow ,i like!! runs like a top . 😁 And im not a mechanic.
I have a 89 GTA. I love the L98 tpi intake setup
Fantastic system, I was there at Flint V8 engine plant when these things were just debuting. They had a test engine sitting over in a corner for years after production started, I guess they forgot about it, I was tempted to ask if I could have it, they probably would have given it to me as scrap. I recently bought one of these Iroc Camaros with this setup and the thing is decently fast for being a 305, 1989 was my awakening to how enormously powerful FI could be in the right engine as I later drove a full size pickup in 1992, and the thing was just a stump puller, torque monster. Referred to in this video as a "sign of things to come". The 2.8 Liter V6 coupled to a manual in the RS camaros was surprisingly fast too with its MPFI. I had one of those as a commuter car.
I think in the mid 80's, everybody who thought in terms of power was still thinking about carburetors. I believe a lot of that had to do with how underpowered the early EFI system / engine combinations were. It wasn't until the TPI system and the Ford 5.0 Mustangs started to roll out that people said "Wait a second..."
I have a L98 TPI in my 88' GTA, I feel these are great street engines and in their era were good performers. A few mods and a tune can really wake these up.
I think every young man coveted the GTA when they came out, I know I did.
We all did. Affording one was another story...
@@rporestorations they were really expensive in their time, I picked up mine for 3k with only 78k miles in 2017.
It was a killer deal and the car really only needed a full tune up including injectors, refresh the suspension and re paint the hood/replace the rear spoiler. The rest was a good cleaning/cut and buff to get it presentable. I did some old school TPI mods but kept all factory pieces.
Amazing to look at is right! ... I loved popping the hood of my Iroc ... the Lt5 in a C4 Zr-1 and the 24valve V6 in a Taurus SHO are super sexy to stare at too!
Owned a 85, 87, and 88 Tuned port Iroc, a 85 Trans am and a 85,94, and 95 corvette with Tuned Port. So much faster than the F bodies with carb or throttle body. My 1987 305 Iroc was the fastest of all the f bodies I owned and was only a bumper slower than a friend's Formula 350ci TP.
GM copied a lot of Bosch's homework in this setup. It was a great system, especially with the air mass meter.
Well, they used Bosch parts. I'm sure they had a hand in it as well as the Buick injection/ignition systems too.
Would have made a good truck motor. I can't believe a short runner LT1-style intake was never made and tested, has to be a story on how it was shelved in favor of the long-runner setup that made it to production
I agree, they would have been a great truck engine.
85 TPI vette absolutely rocks. If you ever have a change to drive one, do it. And drive it hard.
I never believed that quote where the Corvette team saw what the Camaro team was doing with this engine and said they wanted it too. Saying that they had to retune it to work on the 350 late in the game..
If they would have just kept the distributor and water pump setup from this engine when they replaced it with the LT1…
I had an 88 IROC with the l98 5.7. It would roast the posi traction tires off the line and bark going into second. Once it got up to 4,500 RPM those beautiful runners would starve the engine for air and it would fall flat on its face. Still a fun car and drive train.
Great content my brother! Super impressive under hood looks and "meh" on the performance side. They were putting super-chargers on v-6's..... why not the v-8??
Thank you!
Worth remembering, as is the setup on the 86-93 Ford 5.0L
I was at Pontiac back then, this was a good setup at the time, low RPM high torque engine, companies were coming out with larger tubes and lower intake for a sizeable gain, the burnoff relays for that mass air were its downfall
'85 Porsche 928S, US model: 5.0 liters, 32 valves, four cams. 288 hp, 302 ft/lb @ 2700 rpm.
'85 Corvette: 5.7 liter, 16 valves, one remote cam. 235 hp, 335 ft/lb torque.
'85 Porsche 928S2, ROW specification: 16 valves, two cams. 310 hp, 295 ft/lb at 4100 rpm.
Results:
'85 Porsche 928S, US model: 14.0 @ 102. Car & Driver magazine.
'85 Porsche 928S, US model OBSERVED: 15.0 @ 98
'85 Corvette OBSERVED: 15.1 @ 95
Hello-?
My own '85 Porsche 928S2 5 speed, Bithlo Speedway: 13.86 @ 105. Mods included a Borla exhaust, Louis Ott X pipe and Porken chip. No other changes, street tires. And I have the time slip to prove it. 3300 pounds and around 330 hp/2.73 ROW rear axle ratio.
For your interest, I have never seen a COMPLETELY STOCK Acura NSX get a lower trap time than my 13.86-
Folks, power numbers mean nothing; Where the rubber meets the road are quarter mile times and 0-100 numbers.
Great video!
86 IROC Blk w/ -leaktops- T-tops
Just the 305 Tpi but man was it cool. Drove it to school in 11th and 12th grade I sold/gave it to my brother in law who TRADED it for a GRAND MARQUIS 🤬
One step forward and two steps back, engines won't get you very far like that. 🎶
Bosch LH-Jetronic. Take a look at that Tuned Port Injection '85 Corvette V8 and then look at a picture of an '85 Porsche 928S2 engine and you will see the instant similarity. They had the same basic injection system, and the guts of the transmissions were both Borg-Warner.
-Since 1998 Chever-Lay has basically copied various Porsche products to produce their Corvette car. While adding a whole lot of squeaks and rattles....
Posche has been loosing races to Chevy/GM over reliability for decades, and are definitely for the hand stitched fabric crowd who pays by the stitch.
@@dallynsr Whatever you've had to drink? I want one. Must be some strong stuff~
🖕
This has absolutely nothing to do with Porsche lol
Friggen fan boys
@@Flies2FLL
Yep, common view in the rear view mirror you’re #1.
But to each their own.
@@dallynsr Yes, I rather liked the front of the C4 corvettes. They did look good in my rear view mirror, headlights getting closer and closer together....
It was a joke.
Were you there in the 80s? Doesn't sound like it.