bad gas mileage??
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Junior Member
Joined: Jun 2004
Posts: 33
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From: oak harbor, washington
Car: 1982 T/A
Engine: 400 ;
Transmission: 200R ??
bad gas mileage??
I just installed a 400 sbc into my TA. I have been on a couple of fairly small road trips ( 142-200 miles) and the best gas mileage I have gotten is 11.88 MPG. Wondering if that sounds right? seems kinda low to me.
What I know about the car and engine. new engine with 9.1 compresssion, forget cam side but have it at home, stock trans, stock 1982 intake and exhaust manifolds, 750 carb, 3 inch catback system with cat. Going down the road at around 70 mph the engine is running at about 7000 RPM.
Just wondering what anyone is thinking of this.Thanks.
Upcoming plans: Headers, hopefully true dual exhaust, and intake. Then paint and body work.
What I know about the car and engine. new engine with 9.1 compresssion, forget cam side but have it at home, stock trans, stock 1982 intake and exhaust manifolds, 750 carb, 3 inch catback system with cat. Going down the road at around 70 mph the engine is running at about 7000 RPM.
Just wondering what anyone is thinking of this.Thanks.
Upcoming plans: Headers, hopefully true dual exhaust, and intake. Then paint and body work.
Joined: Mar 2000
Posts: 43,187
Likes: 43
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: bad gas mileage??
Originally posted by sailorrick
Going down the road at around 70 mph the engine is running at about 7000 RPM.
Going down the road at around 70 mph the engine is running at about 7000 RPM.
That would explain it.
TGO Supporter
Joined: Jul 2003
Posts: 4,803
Likes: 2
From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
If that's the case, bad gas mileage would be a bit lower on the "things to worry about" list. At least, for me.
Supreme Member
Joined: Jul 2005
Posts: 1,675
Likes: 3
From: Arab, Alabama
Car: 1988 Trans Am GTA
Engine: 350 4BBL
Transmission: 700R4
Axle/Gears: 3.27
Five7: ROTFLMAO!!!
If that is a 400 with a holley type carb, a decent cam, and without TCC lockup, I'd brag about 11.8 MPG!
Pickup truck with a 454 at 75: 10.9
If that is a 400 with a holley type carb, a decent cam, and without TCC lockup, I'd brag about 11.8 MPG!
Pickup truck with a 454 at 75: 10.9
Thread Starter
Junior Member
Joined: Jun 2004
Posts: 33
Likes: 0
From: oak harbor, washington
Car: 1982 T/A
Engine: 400 ;
Transmission: 200R ??
bad gas mileage
7000 rpm would explain allot wouldn't it..
I mean at 70 its around 3000 RPM.
Also the cam is a elgin pro stock e-921-p
292 intake 288 exh.
I mean at 70 its around 3000 RPM.
Also the cam is a elgin pro stock e-921-p
292 intake 288 exh.
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