If you are not able to login to the forum, please Contact Us here to let us know. Thanks!

Support FSC and see no ads! - Click Here
Results 1 to 12 of 12

350 TBI vs 350 Vortec MPG. Are they really that far apart?

This is a discussion on 350 TBI vs 350 Vortec MPG. Are they really that far apart? within the Technical / Maintenance forums, part of the General Discussion category; I have been looking for another truck. Like the OBS chevy 1988-1999 I am trying to keep the initail expense ...

  1. #1
    Registered User bowtieguy101's Avatar
    Join Date
    Nov 2009
    Location
    mobile al
    Posts
    630

    350 TBI vs 350 Vortec MPG. Are they really that far apart?


    Support FSC and see no ads! - Click Here
    I have been looking for another truck. Like the OBS chevy 1988-1999 I am trying to keep the initail expense down within reason as I dont use the truck much. I have been finding reviews that say the vortec 5.7 gets 19 MPG highway in a extended cab 4x4 and the TBI gets 14 Highway in the same truck.

    Any truth to this?

    I can see the 5.3 or 4.8 variations getting better mileage, but the 5.7 seems odd to be so far apart.

    I have 2 trucks with reasonably low mileage within $1000 in price. The 93 doesnt have the third door that (I really hate the 3rd door anyway) and has manual transfer case, the 98 has the third door and is puch button 4x4. So you see where this is going.

    What are your thoughts.
    1995 chevy street pounder project.
    1987 Chevy 2500 Crew cab short bed 4x4 project.
    2005 Yamaha FJR 1300 (daily transportation)

  2. #2
    They're coming for us 1988 GMC 355's Avatar
    Join Date
    Jun 2008
    Location
    Union, Missouri
    Age
    23
    Posts
    10,318

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    Same gears in each truck? Same size tires?

    If so then the TBI will be very close to the vortec. Now stock for stock the vortec will be a bit higher, but for about $100 on the TBI engine you can pick up some MPG to make up that difference, where as with the vortec you would need to spend more, parts are more, the parts that do go bad are more, and the push button 4x4 is more prone to go out then the floor shift.

    IMO I would buy the TBI truck, my 95 ECSB with just some longtubes and single 3" exhaust and a TB spacer was pulling down 17 MPG Hwy with 3.73's gears and 265/75/16 AT's on stock aluminum wheels. TBI is easy to work on, parts are cheap and easy to come by, very reliable, and easy and cheap to mod for some decent gains.

    '95 GMC Z71|L05|GT4|Yukon 17s|Belltech|Purple Keys|FastChip|Hedman|Borla |XtremeFI|Goodmark|Kenwood|Memphis|Ultimate TBI Mods|E Fan|
    Yes it is a 4x4, yes it is lowered

    5200 lbs. at 13.0/17.0MPG
    1988 GMC SOLD

  3. #3
    Registered User
    Join Date
    Oct 2011
    Location
    Pensacola, Fl
    Age
    28
    Posts
    920

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    Vortec made more power...thats for absolutely certain.

    But it came at the price of having that stupid poppet valve/spider injection system.

  4. #4
    They're coming for us 1988 GMC 355's Avatar
    Join Date
    Jun 2008
    Location
    Union, Missouri
    Age
    23
    Posts
    10,318

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    350 TBI was 200HP/300TQ
    350 Vortec was 255HP/330TQ

    More power and torque for sure, but higher parts costs such as the replacement for the poppet setup, intake manifolds gaskets (upper and lower), and sensors are more.

    '95 GMC Z71|L05|GT4|Yukon 17s|Belltech|Purple Keys|FastChip|Hedman|Borla |XtremeFI|Goodmark|Kenwood|Memphis|Ultimate TBI Mods|E Fan|
    Yes it is a 4x4, yes it is lowered

    5200 lbs. at 13.0/17.0MPG
    1988 GMC SOLD

  5. #5
    Registered User bowtieguy101's Avatar
    Join Date
    Nov 2009
    Location
    mobile al
    Posts
    630

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    I have only owned 1 vortec and it drank gas, Mostly due to mods. But I have owned many TBI motors. Basic simple stupid to work on, Never need much attention to maintain , but the best fuel mileage I have ever gotten was a 1992 Z71 with a NV4500 trans. 3:73 gears. It got 16.5 highway running pretty hard. ( I dont know how to drive easy) I will use the truck for pulling my 16 foot enclosed trailer sometimes and general rtuck duty. Otherwise I ride a motorcycle every day.
    1995 chevy street pounder project.
    1987 Chevy 2500 Crew cab short bed 4x4 project.
    2005 Yamaha FJR 1300 (daily transportation)

  6. #6
    Resident Dick Quyonmob's Avatar
    Join Date
    Nov 2005
    Location
    Lanark, Ontario
    Age
    33
    Posts
    14,704

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    A TBI getting 14mpg is sickly. I got 18mpg avg with a tired 305 pushing 32x11.50's and lame 3.42 gears. 20+mpg on the stock 225/75/16 and around the same with 235/85/16.

    305/350=same mpg.

    TBI/Vortec = same mpg, vortec more power.

  7. #7
    Registered User
    Join Date
    May 2012
    Location
    A, A
    Posts
    6

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    I would of thought that the vortec got a lot better of gas mileage??

  8. #8
    Registered User bowtieguy101's Avatar
    Join Date
    Nov 2009
    Location
    mobile al
    Posts
    630

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    Think I am going to stick with the TBI, Throw a set of vortec heads at it adn a small cam. Polish out the TBI and let it eat. Hard to beat the TBI for drop dead relaibility. Thanks everyone.
    1995 chevy street pounder project.
    1987 Chevy 2500 Crew cab short bed 4x4 project.
    2005 Yamaha FJR 1300 (daily transportation)

  9. #9
    Registered User
    Join Date
    Oct 2011
    Location
    Pensacola, Fl
    Age
    28
    Posts
    920

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    Ever get that 91 5/4 ton truck?

  10. #10
    Big Daddy 1-8-4-3-6-5-7-2's Avatar
    Join Date
    Jun 2006
    Location
    North Pole
    Posts
    397

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    My brother's '94 K1500 Suburban 5.7 with 36" Iroks and 4.88 gears got 18 mpg highway from Virginia to Illinois.

    My stock '96 K1500 Suburban rarely sees 13 mpg... mostly about 12.5 average
    :-)

    '96 Suburban, 17x9 Helo's, 37" Toyo MT's, 14 bolt sf, 5.13 Yukon by Custom Differentials, Black Bear tune!



  11. #11
    Habitual Troublemaker cancritter's Avatar
    Join Date
    May 2006
    Location
    Alberta Canada
    Age
    55
    Posts
    4,387

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    Quote Originally Posted by bowtieguy101 View Post
    Hard to beat the TBI for drop dead relaibility. Thanks everyone.
    x2
    [Stole/FOUND 13/03/08 :O)
    91GM 4x4 excb 5.7 @ 40 over, Westers,Eld 3704.Lunati Trickflow 195 @1.6 RR,Walpro 190/overbuilt 700r4 /TCS TC,4.10/tru trac,14 blt,Hooker LT,areofilter,Extreme TBI.MSD.AGR still adding
    07/ 6.7 Cummins..truck included
    70 fury 3
    71 sport fury GT

  12. #12
    Registered User bowtieguy101's Avatar
    Join Date
    Nov 2009
    Location
    mobile al
    Posts
    630

    Re: 350 TBI vs 350 Vortec MPG. Are they really that far apart?

    Quote Originally Posted by 454/4X4 View Post
    Ever get that 91 5/4 ton truck?

    After you make a deal with someone, Dont decide to keep half the truck after the deal is made. Tends to scare buyers away.

    Guy emailed me with a list of things he was taking off teh truck after we decided on a price .. I had to back away before he decided to keep the engine and transmission too.
    1995 chevy street pounder project.
    1987 Chevy 2500 Crew cab short bed 4x4 project.
    2005 Yamaha FJR 1300 (daily transportation)

 

 

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •