What is the difference between 85-87 and 88-92 TPI manifolds?

I was looking at SC setups and they have kits for only 88-92 TPI. And SLP runners have two different variations for 85-87 and 88-92.

I have been wondering this for a while, if you can answer my query I will appreciate it.

 

Provisions for a cold start injector (aka ninth injector) On the drivers side runner, there is an extra hole for a special injector to go into. I used a Speed and Performance plug to plug the hole when I converted to Speed Density.

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If you live in Southeastern US, check us out!
South East Thirdgen


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass,
SSM SFC, Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

Actually, '88 was the last year of the ninth injector. '89 up don't have such a crappy injector.

 

As GMTech eluded, the difference is the elimination of the cold start injector, but this was done for the 1989 model year. The TPI manifolds should be listed as 85-88 and 89-92.

In this case, the variation exists because of the belt drive system used. The v-belt (multiple belts) were used from 85-87. The single serpentine was used from 88-92. This difference places the supercharger on opposite sides, 85-87 on the passenger side (Paxton is the only manufacturer that makes a kit for these years) and on the driver's side for 88-92.



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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
12.57 @ 111 mph.
12.04 @ 114 mph (50-hp nitrous).
http://members.optushome.com/au/downunder1/rides/willie/willie.html

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

 

I know he asked the differance between the manifolds but the reson the kits for superchargers says 88-92 isbecause they went from v-belts to a serpintine belt system.

To my knowledge there are no supercharger kits for v-belt engines. That's why I converter to an 88 serpintine belt, for maybe a future SC'er

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86 Camaro Sport
383 Speed-O-Motive Crate Engine, Trick Flow Heads, 58mm Accel TB, 3.73 Auburn Pro, SLP Cold Air Induction and Headers, Dynomax Cat-back, Serpentine belt setup, Dual IROC Fans.

http://www.sethirdgen.org/octride.htm

 

John,

Paxton makes a supercharger kit for the '85-'87 TPI Camaros. Check out my link for pics.



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Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
12.57 @ 111 mph.
12.04 @ 114 mph (50-hp nitrous).
http://members.optushome.com/au/downunder1/rides/willie/willie.html

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.

 

alright so All I would have to do is to switch to a serpentine system.

although somehow half of my belts are serpentine and one is V-belt

 

Thats just the alternator belt. I think all the V-belt systems have that. I am going to convert mine to serp belt in the future just like John Millican did.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass,
SSM SFC, Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE