350tbi MPG
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Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
350tbi MPG
I was wondering for the ones that have 350 tbi's in their cars whats your guys MPG since i am gonna be doing that swap and was thinking of the mpg i am going to be getting
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Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
Re: 350tbi MPG
The MPG will have more to do with the cam choice and heads than the extra displacement. I was able to get an average of around 28 MPG out of my old 350 in mostly highway driving. At the time, it had an edelbrock performer flat tappet cam (204/214 duration with a 112 LSA) and vortec heads. If you want to get good fuel economy, a set of GMPP vortec heads and a small cam is one of the best ways to go.
If you will be using an unmodified LO5, the fuel economy should be similar to what you have now, but maybe slightly less. Its essentially the same as an LO3, but with a flat tappet cam (in the truck motors), and 45 more cubes. The cam that comes stock is a teeny-tiny one, so you wont get a dramatic increase in performance. But, you can install the engine without the need for much tuning.
If you will be using an unmodified LO5, the fuel economy should be similar to what you have now, but maybe slightly less. Its essentially the same as an LO3, but with a flat tappet cam (in the truck motors), and 45 more cubes. The cam that comes stock is a teeny-tiny one, so you wont get a dramatic increase in performance. But, you can install the engine without the need for much tuning.
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Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: 350tbi MPG
I am gonna swap a L98 block but bolt my tbi to it and a tb spacer and also the injector spacer
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Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: 350tbi MPG
Instead of making a new thread I decided to bump this one and ask if I get a ebl system I would get more mpg as if I just keep the tbi stock or or not.
Last edited by SiCkRs; 07-09-2010 at 02:05 PM.
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Car: 91 Trans am
Engine: built 360 TBI
Transmission: built 700r4
Axle/Gears: 10bolt/3.23
Re: 350tbi MPG
The EBL is a more efficient calculator then the stock TBI ECM, so yes if tuned it will gain some mpg.
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Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: 350tbi MPG
Alright thanks that's exactly what I want since I am gonna have his car as a Daily Driver and mostly street driven. If any one has a 350 tbi wih ebl can you please post you street mpg you are getting also the mods you have done to it.
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Car: 1991 Camaro RS
Engine: 355 Vortec TBI
Transmission: T56
Re: 350tbi MPG
I get about 16.5 most of the time. I don't run city and i don't run much highway. Mostly rural driving.
Mods;
1991 Camaro RS
Engine:
SBC 355; Vortec Heads; Holley 2" TBI w/ GM Injector Pod; GMMP Vortec TBI Intake Bored out to accept 2" TBI; MSD 6A; Comp Cams XE262 .464/.470 lift - 218/224 dur@.05 - 114 lsa; Comp 1.6 Roller Tip Rockers; Comp 26981 Beehive Springs; Granatelli 255lph pump; Aeromotive VAFPR
Exhaust:
1-5/8" SLP 409 Stainless Shorty Headers w/ A.I.R.; 3" Aluminized Tubing; 3" Catco Cat w/ A.I.R.; Edelbrock RPM Series Muffler 3" in - (2) 2.5" out
Drive Train:
'94-'97 F-body T56 Trans; 3" AL DS; Torsen LS rear diff; 3.23 richmond gears
The Brains:
EBL; Zeitronix WB; Type 'K' EGT
Mods;
1991 Camaro RS
Engine:
SBC 355; Vortec Heads; Holley 2" TBI w/ GM Injector Pod; GMMP Vortec TBI Intake Bored out to accept 2" TBI; MSD 6A; Comp Cams XE262 .464/.470 lift - 218/224 dur@.05 - 114 lsa; Comp 1.6 Roller Tip Rockers; Comp 26981 Beehive Springs; Granatelli 255lph pump; Aeromotive VAFPR
Exhaust:
1-5/8" SLP 409 Stainless Shorty Headers w/ A.I.R.; 3" Aluminized Tubing; 3" Catco Cat w/ A.I.R.; Edelbrock RPM Series Muffler 3" in - (2) 2.5" out
Drive Train:
'94-'97 F-body T56 Trans; 3" AL DS; Torsen LS rear diff; 3.23 richmond gears
The Brains:
EBL; Zeitronix WB; Type 'K' EGT
Last edited by Bones232; 07-18-2010 at 09:16 PM. Reason: sig didn't show
#11
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Car: 91Z28
Engine: 5.7 ls1
Transmission: 4l60e
Axle/Gears: 3.42
Re: 350tbi MPG
Oh ok thanks so I should expect around 15 in street since I'm just gonna have a stock L98 block with full exhaust and ebl. Or do you guys think vortec heads is what helps the mpg too.
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