Q-jet TPS?
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Junior Member
Joined: Mar 2020
Posts: 25
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From: Wisconsin
Car: 86 z28
Engine: 1970 Chevy 355
Transmission: 700r4 stock
Axle/Gears: 2.73
Q-jet TPS?
I’m swapping carburetors. Currently I have the stock Q-jet on a mild built 355 we did last year just to finish setting up engine to run and get it home for the winter. I’m going with a street demon carb. Now I can buy a TPS for the demon. My question is do I need it? We do have the 700r4 auto tranny.
Joined: May 2004
Posts: 5,338
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From: Lexington, SC
Car: 1987 SC/1985 TA
Engine: 350/vortec/fitech
Transmission: T56
Axle/Gears: 3.27 9-bolt
Joined: Dec 2005
Posts: 4,796
Likes: 16
From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: Q-jet TPS?
Unless you also get rid of the computer controlled distributor, you need the TPS to help meter fuel.
Joined: Feb 2017
Posts: 4,185
Likes: 576
From: Meriden, CT 06451
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: Q-jet TPS?
I actually ran a non-computer carb (Holley spreadbore DP) with the computer controlled system many years ago. I rigged up a TPS to the primary throttle arm and ran it with the computer distributor. Interestingly it would set a lean code when cruising at about 40 MPH from time to time. But otherwise it controlled timing and TCC lock-up like it did with the computer carb.
Not saying I recommend it, but it is possible to do.
Not saying I recommend it, but it is possible to do.
Thread Starter
Junior Member
Joined: Mar 2020
Posts: 25
Likes: 3
From: Wisconsin
Car: 86 z28
Engine: 1970 Chevy 355
Transmission: 700r4 stock
Axle/Gears: 2.73
Re: Q-jet TPS?
We are eliminating all electronic stuff. Bought a msd hei distributor and putting street demon on without the tps add on. It’s only needed if you have computer controlled tranny like in gen 4’s. It is nice that it has a idle kick up that can be added for the a/c.
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: Q-jet TPS?
Very simple, then. If you have a non-computer distributor, you don't need a TPS.
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Nov 9, 2006 09:16 PM