Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

increasing MPG????

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by chase78, Apr 20, 2003.

  1. chase78

    chase78 Newbie

    Joined:
    Apr 20, 2003
    Posts:
    1
    Likes Received:
    0
    I'm going to be getting a 72 k5 soon. With gas prices and all I'm think of ways to increase MPG. I had a 78 K5 with a HEI, MSD 6A, ALum intake manifold, and installed a 4X4 front wheel locks go to 4X2. I got really good fuel milage aBOUT 12 mpg WITH THAT SET UP. I thinking headers, alum heads, and 5-speed trany with an overdrive gear on the 5th one for high way cruising. My question is what tranny will fit? OR can I go with diffenernt axle gearing to get the job done. It would be gear to get 15MPG. push comes to shove i can always go fuel injected but that sorta pricey.
     
  2. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
    NV 4500 tranny
     
  3. naranja72

    naranja72 1/2 ton status

    Joined:
    Jan 6, 2002
    Posts:
    110
    Likes Received:
    0
    Location:
    vancouver, bc, canada
    has anyone heard of this company, gofitch , I have not tried this product nor am I a salesman for this product, saw it in www.can4x4.com , it said it could increase you gas mileage "by improving the combustionbility of hydrocarbon fuels immediately before it enters the combustion chamber." Would be cool if it worked, unlike some of the other farfetched claims made by other companies. /forums/images/graemlins/thumb.gif
     
  4. 88streetblaze

    88streetblaze 1/2 ton status

    Joined:
    Jun 27, 2001
    Posts:
    314
    Likes Received:
    0
    Location:
    middle of sticks, oklahoma
    you could go tbi, watch ebay and you can find complete factory tbi setups for cheaper than tpi.

    as for the gofitch, i'm a chemist and i see some truths in their claims, however i don't think that it does it to the extent that they say. one thing that a lot of these "studies" do is use statistics as the voodoo math to manipulate the data to make it look like they want it to or they change the test where they are not truely holding one variable(which should be their product) constant,

    for instance and their bacterial growth with and w/o their product is not a fair comparison, different mixtures and types of bateria, all conditions should have been the same except the prescence of the product.

    i would like to completly read their fuel economy/emmisions to see the conditions of that test.
     
  5. 88Silverado

    88Silverado 1/2 ton status

    Joined:
    Mar 13, 2003
    Posts:
    2,664
    Likes Received:
    0
    Location:
    Quartz Hill, So. Cal
    I just cleaned my TBI, put in new plugs, kicked the timing up 2 degs, put 35psi in the tires and cut the end cover off the cold air intake for ram air and with a 700r tranny I just got...... 11.5MPG /forums/images/graemlins/frown.gif
     
  6. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

    Joined:
    Mar 5, 2001
    Posts:
    15,683
    Likes Received:
    1,392
    Location:
    642 Days to BB2018
    [ QUOTE ]
    I'm going to be getting a 72 k5 soon. With gas prices and all I'm think of ways to increase MPG. I had a 78 K5 with a HEI, MSD 6A, ALum intake manifold, and installed a 4X4 front wheel locks go to 4X2. I got really good fuel milage aBOUT 12 mpg WITH THAT SET UP. I thinking headers, alum heads, and 5-speed trany with an overdrive gear on the 5th one for high way cruising. My question is what tranny will fit? OR can I go with diffenernt axle gearing to get the job done. It would be gear to get 15MPG. push comes to shove i can always go fuel injected but that sorta pricey.

    [/ QUOTE ]



    This is a joke right? /forums/images/graemlins/crazy.gif
     
  7. Chris_T

    Chris_T 1/2 ton status

    Joined:
    Mar 17, 2001
    Posts:
    718
    Likes Received:
    0
    Location:
    Saskatoon, SK
    Before you start making a ton of upgrades you may want to look into a sort of cost-benefit analysis. For example, I have a 700R4 that I swapped in place of the TH350. To get the right combination it also involved getting deeper gears to get the overdrive rpms in the right range with my tire size. From a purely financial point of view it makes no sense. Here's my point in purely fictional terms:

    Lets say you get 10 mpg and your mods will increase your mileage to 12 mpg. That's a 20% increase which is pretty damn good.

    Now lets say it took $1000 to do it, which is probably optimistic, but the math is easier.

    For every 10,000 miles you drive at 10 mpg you burn 1000 gallons, costing $2000

    For every 10,000 miles you drive at 12 mpg you burn 833 gallons, costing $1667 - a savings of $333 - not too shabby, but you still have to drive 30,000 miles just to recoup your initial $1000 investment .. and that's at $2/gallon. At $1.75 a gallon you have to drive close to 35,000 miles and at $1.50 you have to drive 40,000 miles .. and that's for each $1000 spent at a 20% increase in mileage. Let's say you spent $2000 .. you have to think, "Will I have my Blazer in 80,000 miles?"

    If you're already got 12 mpg and want 15 ..that's a 25% increase, pretty hard to do.

    Obviously I made a swap, but it wasn't for the economy. I got better driveability and enjoyment out of my truck along with it. I wouldn't say don't do it, but work the math. NV4500's are not cheap, but you do get added driveability. Ask Steve Chin about his, he really likes it, but you're going to have to sink some serious pesoes into a stock 72 K5 to get 15 mpg. If we wanted good mileage we'd be driving civics and geos /forums/images/graemlins/smile.gif
     
  8. 88streetblaze

    88streetblaze 1/2 ton status

    Joined:
    Jun 27, 2001
    Posts:
    314
    Likes Received:
    0
    Location:
    middle of sticks, oklahoma
    really. before i pulled out my tbi i was getting 13-14 mpg city and a hair over 16 on the highway. and i have a hard time keeping my foot out of the gas, with my lt-1 i'm getting a hair over 15 city, i'm looking forward to seeing highway.....

    the reason i sugested tbi is because i've seen complete setups go for a little over $200 on ebay in the last week to me that seems like it might be a good way to improve gas milage even if you have to buy a harness and the few other things you'll need i would think you could still do that at most at $650, and i don't know about you guys but 10,000 miles is not a lot to me....

    just a thought.........
     
  9. Stroked72Blazer

    Stroked72Blazer 1/2 ton status

    Joined:
    Nov 9, 2002
    Posts:
    352
    Likes Received:
    0
    Location:
    Little Rock, AR
    The problem with TBI is it uses a MAP senser which is unable to properly calibrate and adjust for engine modifications.

    Early TPI's use a MAF senser which is able to accomadate some minor modifications but still can't accomidate heavier jets and such.

    Both systems can be programed for modifications but this gets into more expense.
     
  10. blazingjesse

    blazingjesse 1/2 ton status

    Joined:
    Mar 13, 2001
    Posts:
    159
    Likes Received:
    0
    Location:
    kayenta, AZ
    You could move to a really low eleavtion, i found out that when i go to Phoeinx,AZ my gas improves by 2 MPG, it could be cheaper than trying to fix up your truck ahhahaha /forums/images/graemlins/rotfl.gif
     
  11. 72beater

    72beater 1/2 ton status

    Joined:
    Oct 11, 2002
    Posts:
    224
    Likes Received:
    0
    Location:
    Nation\'s Capital
    NOTE: this is humor, not a flame!
    you could swap in a freshly tuned 253 6 banger, mate it up to an OD manual, and throw in 3.08 gears. While you are at it you can pull the case 'cause that is a serious source of friction. Then, you can put on some nice p235R15 skinnies and load up the differentials and the engine with synthetic oil. After all that, you are still propelling a 3+ton vehicle down the highway with a coefficient of drag of some terribly high number, and you might get to 15-16 mpg! Come on, I'm with Greg, you have got to be kidding!
     
  12. dysphemism

    dysphemism 1/2 ton status

    Joined:
    Oct 26, 2001
    Posts:
    667
    Likes Received:
    0
    Location:
    Fremont, CA
    Big block.
     
  13. RingMaster4x4

    RingMaster4x4 1/2 ton status Premium Member

    Joined:
    Mar 4, 2001
    Posts:
    2,049
    Likes Received:
    0
    Location:
    Bartlett, Texas
    [ QUOTE ]
    Big block.

    [/ QUOTE ]

    Big Blocks Kick A$$! /forums/images/graemlins/thumb.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/pimp1.gif
     
  14. dysphemism

    dysphemism 1/2 ton status

    Joined:
    Oct 26, 2001
    Posts:
    667
    Likes Received:
    0
    Location:
    Fremont, CA
    Yeah I most definitely say put a big block in it. That way you can get the most out of those 5 mpg.
     
  15. '72brett

    '72brett 1/2 ton status

    Joined:
    Dec 3, 2002
    Posts:
    166
    Likes Received:
    0
    Location:
    northwest Iowa
    big blocks are hard to come by in Iowa /forums/images/graemlins/frown.gif
     
  16. Rusty68

    Rusty68 1/2 ton status

    Joined:
    Jan 22, 2003
    Posts:
    116
    Likes Received:
    0
    Location:
    Elko, Nevada
    I was wondering today if tire tread design had any effect on mileage. For instance, would say a 33-12:50 mud TA vs a 255/85 AT tire. It would seem that a narrower tire and mild tread would not have as much rolling resistance and aero dynamic effects. hmm,
     
  17. dysphemism

    dysphemism 1/2 ton status

    Joined:
    Oct 26, 2001
    Posts:
    667
    Likes Received:
    0
    Location:
    Fremont, CA
    yeah the smallest contact patch is best. Those cars that go 2000 miles on a single gallon always have paper thin tires.
     
  18. Anthony72K5

    Anthony72K5 Registered Member

    Joined:
    Mar 17, 2003
    Posts:
    20
    Likes Received:
    0
    A well tuned engine with a free flowing exaust and K&N airfilter is probably the best cheap way to improve gas mileage.

    Putting a 6 cyc in a full size truck is NOT a good way to get improved gas mileage. And don't forget to lower recipricating weight as much as possible, narrow AT tires and aluminum rims could help with that.

    But in my opinion, if you want good mileage and you're buying a truck, you're missing the point. Buy a Celica for $300 that will get 30+ mpg, and drive the K5 for fun.
     
  19. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

    Joined:
    Jan 27, 2003
    Posts:
    3,254
    Likes Received:
    0
    Location:
    Castro Valley, CA
    You got it right man, dont worry about gas mileage. K5 or Honda?
     
  20. 72beater

    72beater 1/2 ton status

    Joined:
    Oct 11, 2002
    Posts:
    224
    Likes Received:
    0
    Location:
    Nation\'s Capital
    hey, you should try and avoid absolute statements like NOT since they are the easiest logical position to refute. If you put a six in and drive CONSERVATIVELY, you will use less fuel than the v-8. that is just thermodynamics, man. nearly all reciprocating ic engines have the same effective (and low) efficiency at design speed, so try to avoid that trap of arguing efficiency. just my 0.02 cents.
    ernest
     

Share This Page