putting back factory throttle body for better MPG?
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Joined: Sep 2017
Posts: 111
Likes: 5
From: Hamilton, NJ
Car: 1988 Trans Am GTA
Engine: 383 TPI
Transmission: 700r4 3000 stall non-lockup
Axle/Gears: 12 Bolt Rear 3.73
putting back factory throttle body for better MPG?
If I have a 10.25:1 383 stroker, could I put back the factory throttle body and smaller injectors to get better MPG? I know I'll be cutting my power in half, but I really only cruise the car. Just wondering if reducing air and fuel would cause running issues or detonation issues.
Joined: Dec 2004
Posts: 16,754
Likes: 996
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: putting back factory throttle body for better MPG?
Tpi ? Stock 48mm throttle body won’t effect fuel economy. You can see air fuel ratio with a wideband.
dont want to lean out to much. If tune is safe make sure hwy mode is enabled.
dont want to lean out to much. If tune is safe make sure hwy mode is enabled.
Joined: Apr 2010
Posts: 513
Likes: 43
From: New Jersey
Car: 87 Monte Carlo SS
Engine: 89 350TPI Transplant
Transmission: 2004r
Axle/Gears: 3.73
Re: putting back factory throttle body for better MPG?
One thing that I see is that you are running a 700R4 non lockup. Running a non lockup torque converter will cause reduced gas mileage. I agree with Tuned that you should look at running a wide band O2 and see your A/F ratio. Also read your spark plugs to see if the motor is running rich or lean. Good Luck.
Thread Starter
Member
Joined: Sep 2017
Posts: 111
Likes: 5
From: Hamilton, NJ
Car: 1988 Trans Am GTA
Engine: 383 TPI
Transmission: 700r4 3000 stall non-lockup
Axle/Gears: 12 Bolt Rear 3.73
Re: putting back factory throttle body for better MPG?
One thing that I see is that you are running a 700R4 non lockup. Running a non lockup torque converter will cause reduced gas mileage. I agree with Tuned that you should look at running a wide band O2 and see your A/F ratio. Also read your spark plugs to see if the motor is running rich or lean. Good Luck.
This isn't the factory 700r4, it's a art carr unit.
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