Conversion 82 crossfire to TPI

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Nov 7, 2007 | 03:37 AM

Robert Potter

Thread Starter

Intermediate

Joined: Jul 2006

Posts: 44

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From: West Covina CA

Conversion 82 crossfire to TPI

I have a 1982 C3. How difficult is it to convert my Crossfire Injection to TPI?

What parts would I need?
Thank you

Nov 7, 2007 | 06:28 AM

Rotonda

Burning Brakes

Joined: Sep 2006

Posts: 1,071

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From: Rotonda FL

Look for a 90 to 92 (91 corvette) speed density unit. You will need to replace:
1) swap your existing fuel pump for a high pressure in tank unit
2) replace your existing intake with an entire tpi assembly
3) replace your ecm/computer with an appropriate tpi unit
4) Replace your FI wiring harness (you MAY be able to avoid this. Talk with Speed and Performance - their "Integrator harness" MIGHT be useable. This is an add-on harness which converts your existing tbi harness to TPI)
5) various sensors sprcific to TPI

Your current distributor will work with TPI.

Nov 7, 2007 | 10:12 AM

Black 82

Instructor

Joined: Apr 2006

Posts: 180

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From: Jersey

I'm pretty sure only the '85 TPI unit will fit the L83 engine. I think '86 and up are for Vortec style heads.

Nov 7, 2007 | 10:50 AM

mooneyd

Drifting

Joined: May 2004

Posts: 1,442

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From: Flanders NJ

You're wasting your money if you don't change the heads. The L83 heads are one of the worst flowing heads GM had. If you add heads and a cam to that list, you will be happy.

Nov 7, 2007 | 03:17 PM

0Paul Ruggeri

Former Vendor

Joined: Nov 2006

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From: Carmichael ca

Quote:

Originally Posted by mooneyd

You're wasting your money if you don't change the heads. The L83 heads are one of the worst flowing heads GM had. If you add heads and a cam to that list, you will be happy.

I agree, these heads are really poor. Almost any other head would be better. The previous post about only an 85 manifold working on your car is not correct, any L98 manifold will bolt on.

Paul

Nov 7, 2007 | 04:28 PM

markdtn

Le Mans Master

Joined: Aug 2003

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From: Chattanooga TN

Quote:

Originally Posted by Black 82

I'm pretty sure only the '85 TPI unit will fit the L83 engine. I think '86 and up are for Vortec style heads.

This is not correct. All Vette TPI intakes interchange with the "old" bolt pattern. The later F-body TPI intakes have the different center bolt angle.

Nov 7, 2007 | 06:57 PM

Buccaneer

Safety Car

Joined: Nov 2005

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From: Arizona - If you don’t know CFI, STOP proliferating the myths around it...

Ok Robert, I'll bite...What's wrong with your CF? Why do you want to move to TPI and the added cost of doing that, the possible gain IMO isn't worth the expense, ie...ROI Return on Investment. If your CF is setup properly, it will run fine and be very realiable. You can do other mods to perk the HP up a bit at a much lower cost than going to TPI. Again, this is only my opinion and others will vary.

Nov 8, 2007 | 04:00 PM

terry82

Le Mans Master

Joined: Jul 2000

Posts: 6,664

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From: columbia city in

keep the cross-fire intake . tpi is nice but its more work than you need to do . put on new heads new cam ,headers and a set of rear gears .easy to do .crossfire is good up to about 400 hp .http://www.crossfire.homeip.net/cftest/check out this site.