TPIS Headers

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Mar 10, 2003 | 05:45 PM

Turbo Bob

Thread Starter

Melting Slicks

Joined: Mar 2001

Posts: 3,239

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From: Parkland Florida

Corvette Challenge Champ-01

Dragster Challenge Champ-06

TPIS Headers

I'm thinking about buying a set of TPIS headers for my 1985 L-98 coupe. What I need to know is what is the size of the primary tubes? Are they 1 5/8" which is what I want for my L-98 or are they 1 3/4" which would absolutely kill all my low end torque. Any one know?

Mar 10, 2003 | 05:56 PM

VetteNoob

Le Mans Master

Joined: Jan 2002

Posts: 5,320

Likes: 4

From: Kyle TX (Because Mojo Made me fill it in)

Re: TPIS Headers (Turbo Bob)

Forget all the stories you have heard about losing TQ with the larger headers. You wont. I have the 1 3/4" TPIS headers and lost no TQ. Actually I gained some across the board.
http://forums.corvetteforum.com/zerothread?id=470176

[Modified by VetteNoob, 4:59 PM 3/10/2003]

Mar 10, 2003 | 05:56 PM

85vet

Melting Slicks

Joined: Oct 2000

Posts: 3,426

Likes: 4

From: Heidelberg PA

Cruise-In V Veteran

Re: TPIS Headers (Turbo Bob)

I am not positive what the measurements are, but I do have a set on my car. If I lost any torque, I sure could not tell, since it improved my times at the track. The engine revs higher and I have less resonance compared to before installing them.

Do a search in archives, this issue has come up many times and there is some great info on these headers.

Mar 10, 2003 | 11:26 PM

FlyboyZR1

Drifting

Joined: Aug 2001

Posts: 1,550

Likes: 27

From: Minneapolis MN

Re: TPIS Headers (Turbo Bob)

TPIS only makes 1 3/4" headers. I think I'm going to go with these on my mainly stock L98, as most people have been happy w/them...plus they'll benefit any future mods.

Check this out: http://forums.corvetteforum.com/zerothread?id=509518

Mar 11, 2003 | 08:28 AM

vader86

Team Owner

Joined: Sep 2001

Posts: 62,067

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From: Athens AL

C7 of the Year - Unmodified Finalist 2021

C4 of Year Finalist (performance mods) 2019

Re: TPIS Headers (85vet)

its unlikely that any set of headers will kill all your low-end torque, but 1.75" on a stock engine may cost you a couple ft-lbs at WORST, though its unlikely that youll notice it at all

but anything you lose down low, you get back in midrange and top end

Mar 11, 2003 | 03:50 PM

Greg Johnson

Burning Brakes

Joined: Jan 2000

Posts: 1,015

Likes: 3

From: Esko MN

Re: TPIS Headers (Turbo Bob)

I had them on my '85. They are 1 3/4". Never noticed any seat of the pants difference in torque.

Mar 11, 2003 | 08:06 PM

Dominic Sorresso

Le Mans Master

Joined: Sep 2000

Posts: 6,303

Likes: 714

From: Bartlett IL

Re: TPIS Headers (Greg Johnson)

Have them on my Xfire.If anything, they fattened up the torque curve. Excellent header to build te rest of your mods around. They're sleepers too. With all the standard bracketing and bolts, you'll do a double take to notice they're headers. CAVEAT: They're built for ANGLE PLUG HEADS.