Fuel Consumption of New Crate Engines

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Apr 28, 2006 | 12:17 PM

PeterFeix

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From: Viersen, Germany

Car: Trans AM GTA 1989

Engine: 383 HSR AFR195 JRC Cam280/286

Transmission: T56 Conversion

Axle/Gears: 3.27 9bolt

Fuel Consumption of New Crate Engines

Hi!
I'm planning to swap my TPI Engine to a brand-new carbuerated one.
I think the 385' with Fast Burn Heads is the best choice for me.

Currently, I have a average MPG of ~ 15.5-16 ( 88' 350 TPI ; AT ; 2.73 rear, w/o AC ). That's pretty much, at these high fuel prices. ( about 6$/gallon ).
So I want to run the new engine with LPG instead of simple 95' octane gasoline. ( about 10% higher fuel consumption, but just 2,60$ /gallon.

My general question is: Would that new ~400HP engine consume less fuel than my TPI?
Would be very nice of you, if you could post your MPG's of your 3rdGen's with Crate Engines in place of a stock one.

greetz
alex

Last edited by PeterFeix; Apr 28, 2006 at 12:31 PM.

Apr 29, 2006 | 10:46 AM

PeterFeix

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From: Viersen, Germany

Car: Trans AM GTA 1989

Engine: 383 HSR AFR195 JRC Cam280/286

Transmission: T56 Conversion

Axle/Gears: 3.27 9bolt

i forgot to mention the emissions in comparison to a tpi engine.

greets
alex

Apr 29, 2006 | 12:28 PM

JamesC

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From: Lawrence, KS

Car: Met. Silver 85 IROC/Sold

Engine: 350 HO Deluxe (350ci/330hp)

Transmission: T-5 (Non-WC)

Axle/Gears: Limited Slip 3.23's

350 HO Deluxe. 18 on the highway.

JamesC

Apr 30, 2006 | 12:16 AM

Tobias05

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From: any clime or place...

Car: 1987 Camaro SC, 1999 Z28

Engine: GMPP 350HO, LS1

Transmission: Built 700r4/EDGE 3200, T56

Axle/Gears: 3.42 Eaton 7.625, 3.42 Zexel Torsen

about 20, running pig rich.

I just re-wired my lockup since throwing in the crate engine, so that should add a few MPG.

26 inch tall tires, 2.73 gears, 700r4 lockup... 1600RPM at 55 roughly.

gonna jump down a size on the accelerator nozzle and secondary jets. that should help too.

Apr 30, 2006 | 12:39 AM

99Hawk120

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Joined: Jan 2001

Posts: 1,411

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From: Rock Hill, SC

Car: 1999 Pontiac T/A Firehawk

Engine: ***'s Engine

Transmission: T56

Had a ZZ4 crate, T56, 3.89 gears, computer controlled QJet. 19 city, 24 highway.

Apr 30, 2006 | 09:02 PM

PeterFeix

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From: Viersen, Germany

Car: Trans AM GTA 1989

Engine: 383 HSR AFR195 JRC Cam280/286

Transmission: T56 Conversion

Axle/Gears: 3.27 9bolt

huge difference between the 350 HO and the ZZ4.... hmm
zz4 sounds good...
hmmm, with 2.73gears & th700r4, i think die mileage should be nearly the same, probably better.

May 1, 2006 | 10:59 AM

five7kid

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Posts: 43,187

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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

There's a big difference between the setups the two guys are running. T56 is a big advantage over an automatic.

The Fastburn is a pretty healthy engine. Not sure how you'd do on emissions testing. The LPG may help, though. I seriously doubt you're going to approach the TPI mileage with any carburated engine, regardless of the fuel type.