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Old 06-09-2005, 01:16 PM   #1
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Join Date: Sep 2002
Location: Duluth, Ga
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Car: 91 RS
Engine: 305 TPI
Transmission: T5
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What kind of gas milage are 383 tpi guys getting?
How much worse is it than a 350.
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Old 06-09-2005, 02:40 PM   #2
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Join Date: Jul 2003
Location: Dallas, TX area
Posts: 3,205
Car: 91 Formula WS6 (Black, T-Tops)
Engine: 383 MiniRam (529 HP, 519 TQ - DD2K)
Transmission: Built '97 T56, Pro 5.0, CF-DF
Axle/Gears: 4.11 posi Ford 9"

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I'm getting around 13.5 - 14.5 with "spirited" driving around town and around 21 or so running the A/C on the highway around 70MPH.....
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Old 06-09-2005, 11:02 PM   #3
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I get about 18 in my chevelle with 3:73's.
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Old 06-10-2005, 01:33 AM   #4
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Car: 91 GTA, 91 Formula, 89 TTA
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Dont have a real good town number so I woulg guess about 15-18mpg.

the highway is another matter, its break in run to bowling green KY from NW IN it averaged over 20 on the way down.

I tuned and tuned while I was there and averaged 21.45 on the way home with loaded car and windows down doing 70+ the entire way home.

This is on pure tuning alone and still have other things to play with like highway mode and the like :-)

Its a vortec headed TPI 383 w/ 8.67-1 compression and a 216/221 w/ .500 lift cam. Gears are 3:23 and converter is a vigi 2600stall lockup.

later
Jeremy
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Old 06-10-2005, 04:22 AM   #5
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Car: 1989 GTA Nighthawk
Engine: 389 CID TPI
Transmission: TCI 700R4
Axle/Gears: 9 bolt 3.23

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About the same, around 15 in city, and 21 to 22 on the highway.
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1/4 mile 11.742@117.8 on Drag Radials 12.22@118.0 on street tires, top speed over 180 mph.
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Old 06-12-2005, 11:06 AM   #6
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Join Date: Jan 2005
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Car: 2 1990 IROC-Z Camaros, 2000 WS6 TransAm RAM-AIR, Honda Civic & Cougar (daily drivers)
Engine: supercharged 383 TPI, 5.7 TPI, 5.7 LS1, 1.6, & supercharged 3.8
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Our supercharged 383 TPI gets right around 15-17 with the AC on and driving it normal
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Old 06-13-2005, 12:54 PM   #7
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13 to 14 all short 5 to 8 mile trips and playing some. Have not done any HW driving with this setup.
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Old 06-13-2005, 12:54 PM
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