What are corvette vs. camaro TPI differences?
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From: Toronto,Ontario
Car: 1989 IROC-Z
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What are corvette vs. camaro TPI differences?
Hello
I was wondering if the corvette tuned port injection was different in some way than in a 350 camaro tpi.
Speed
I was wondering if the corvette tuned port injection was different in some way than in a 350 camaro tpi.
Speed
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From: Ontario, Canada
Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
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they had an external EGR becasue of the aluminum heads not haveing a crossover . . Other than that they had a metal distributor cover and a little different tune .
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From: Old Bridge, NJ
Car: 1992 Camaro RS
Engine: 383 SuperRam
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Axle/Gears: 3:23 Posi
Corvette had a better exhaust system with true duals but besides aluminum heads, external EGR and a different tune. They are basically the same.
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From: Old Bridge, NJ
Car: 1992 Camaro RS
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yup all the same. The manifold base was slightly different to use the external EGR tube and the center 4 manifold bolts were the older style.
Last edited by Fast92RS; Jun 28, 2006 at 05:04 PM.
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The fuel fittings from fuel rail comes out on opposite side also. I think the plenum has a fewer groves cut in top also.
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From: Ontario, Canada
Car: 1989 IROC-Z
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Originally Posted by scuzz
The fuel fittings from fuel rail comes out on opposite side also. I think the plenum has a fewer groves cut in top also.
depends on what year it was
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I'm using a corvette setup. The fuel rails sometimes dumped on the passenger side instead of curving over to the driver's side. Also, as mentioned, there may be an EGR port on the passenger's side just in front of the distributor hole. You can buy block-off plates to cover that up... I made one by using the corvette EGR tube, removing the tube and welding the hole shut with a small piece of steel.
The other thing to consider is the ECU. Some computers on corvettes were the 1227727 (weather proof) design (speed density), where the corresponding 3rd gen used the 1227730 computer. They don't have the same connectors, but they use the exact same program, logic and prom. Also, this type of harness, if you're swapping is shorter because the ecu was typically kept in the engine compartment. So, if you use that for a swap, you too will probably have to mount the ecu into the engine compartment.
The other thing to consider is the ECU. Some computers on corvettes were the 1227727 (weather proof) design (speed density), where the corresponding 3rd gen used the 1227730 computer. They don't have the same connectors, but they use the exact same program, logic and prom. Also, this type of harness, if you're swapping is shorter because the ecu was typically kept in the engine compartment. So, if you use that for a swap, you too will probably have to mount the ecu into the engine compartment.
Originally Posted by DerekKraese
Corvette had a better exhaust system with true duals but besides aluminum heads, external EGR and a different tune. They are basically the same.
no true duals on L98 vette's. there exhaust sucked as well.
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From: Back in the states...
Car: Silver 1980 Corvette (L82 w/TPI)
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Originally Posted by speedmachine
Hello
I was wondering if the corvette tuned port injection was different in some way than in a 350 camaro tpi.
Speed
I was wondering if the corvette tuned port injection was different in some way than in a 350 camaro tpi.
Speed
I posted this somewhere else...
There were three different plenums used through the TPI era-
The plenums break down into three groups--'85-88 (left), '89 only (middle), and '90-up (right).
The fuel inlets and returns differ between the different years. The '89-91 Corvette fuel rail (left) has a female 16mm passenger-side inlet and a female 16mm return. The '85-88 Corvette (middle) has a female 16mm passenger-side inlet and a female 14mm return. The '85-92 F-body (right) has a female 16mm driver-side inlet and a female 14mm return
Three intake manifold styles were used on the TPI equipped engines. The '87-91 Corvette intake on the left used a heat-riser tube off of the passenger-side header and has a water crossover at the back to relieve hot spots on the back of the aluminum heads. The middle intake was used on '85-86 IROCs, T/As, and Corvettes with cast-iron heads with outside valve-cover bolt holes (early-style). (The two center bolts on these two intakes are at the same position as the end bolts and will fit the early head-bolt pattern.) The intake on the right was used on '87-92 IROCs and T/As with cast-iron heads with center-bolt valve covers. The '87-95 intakes with the later cast-iron head-bolt pattern can be machined to fit the early bolt pattern. If you want to run Vortec and Fast Burn-style heads, GM and S&P have new TPI intakes to adapt a TPI to both.
All the passenger-side TPI tubes (top) for all '85-92 models are the same. There are two different driver-side tubes. The '85-88 units (left) had the ninth injector port (arrow), while the '89-92 F-body and '89-91 Corvette tubes (right) didn't.
The fuel inlets and returns differ between the different years. The '89-91 Corvette fuel rail (left) has a female 16mm passenger-side inlet and a female 16mm return. The '85-88 Corvette (middle) has a female 16mm passenger-side inlet and a female 14mm return. The '85-92 F-body (right) has a female 16mm driver-side inlet and a female 14mm return
Three intake manifold styles were used on the TPI equipped engines. The '87-91 Corvette intake on the left used a heat-riser tube off of the passenger-side header and has a water crossover at the back to relieve hot spots on the back of the aluminum heads. The middle intake was used on '85-86 IROCs, T/As, and Corvettes with cast-iron heads with outside valve-cover bolt holes (early-style). (The two center bolts on these two intakes are at the same position as the end bolts and will fit the early head-bolt pattern.) The intake on the right was used on '87-92 IROCs and T/As with cast-iron heads with center-bolt valve covers. The '87-95 intakes with the later cast-iron head-bolt pattern can be machined to fit the early bolt pattern. If you want to run Vortec and Fast Burn-style heads, GM and S&P have new TPI intakes to adapt a TPI to both.
All the passenger-side TPI tubes (top) for all '85-92 models are the same. There are two different driver-side tubes. The '85-88 units (left) had the ninth injector port (arrow), while the '89-92 F-body and '89-91 Corvette tubes (right) didn't.
Identifying GM's Tuned-Port Injection Units-
Identifying GM's Tuned-Port Injection Units
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From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
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"Some computers on corvettes were the 1227727 (weather proof) design (speed density), where the corresponding 3rd gen used the 1227730 computer. They don't have the same connectors, but they use the exact same program, logic and prom."
ALL Vette SD ECM s are 727 weatherpack.
The Vette 727 ECM programming has a requirement for a data signal from the CCM (another damm computer ) which is not present in the F-bodies.
727 popular with offroader using EFI due to it's waterproof ability
ALL Vette SD ECM s are 727 weatherpack.
The Vette 727 ECM programming has a requirement for a data signal from the CCM (another damm computer ) which is not present in the F-bodies.
727 popular with offroader using EFI due to it's waterproof ability
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From: Vancouver,BC
Car: 91 camaro vert
Engine: 350,113heads,ccxfi260, slp shortys
Transmission: 700r4
Axle/Gears: 3.23s posi discs
Re: What are corvette vs. camaro TPI differences?
What has to be done to the 87-92 camaro intakes to fit the 88 style aluminum corvette heads,I had no idea their was a difference in the intakes.
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From: San Diego, California
Car: Trailblazer EXT 4.2 (Firebird Form)
Engine: 5.1 4bbl
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Re: What are corvette vs. camaro TPI differences?
If you're thinking about using this setup on an emission controlled vehicle, make sure it's a legal transplant, because here in California, I believe only F-Body setups can be transplanted to other F-bodys...
Joined: Apr 2008
Posts: 128
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From: Vancouver,BC
Car: 91 camaro vert
Engine: 350,113heads,ccxfi260, slp shortys
Transmission: 700r4
Axle/Gears: 3.23s posi discs
Re: What are corvette vs. camaro TPI differences?
I'm not to worried about emissions, i have a 91 305 tpi and im swapping in a 350 with aluminum vette heads not sure what machining needs to be done hope its not too difficult.I haven't had time to check out the differences on my parts yet.
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