Looking for a 4wd vehicle!

Discussion in '4x4's, SUV's and P/U Trucks' started by carrmann, Oct 28, 2011.

  1. phoebeisis

    phoebeisis Well-Known Member

    25mpg with a 1/2 ton V-8 carburetor and an old AT like that-impressive.
    Did you use stock jetting?
    I could approach that with the Suburban-maybe-maybe even get 25mpg-but I suspect it might be at slightly less than 55mph.It gets 21mpg-but that is long hy trips probably at 60 mph-and maybe 1/3 of those miles are at >2000 ft altitude-less drag.
    25mpg-maybe slightly over 50 mph.Maybe I'll try it sometime.

    Carrmann-when is ETA- 15 days or so??Keep us posted!!
  2. carrmann

    carrmann Well-Known Member

    that is impressive for something old and carbureted lol!!

    more like 25 ish. i wish 15! oh well. already bought some stuff. tonneau cover, undercoat, linex bedliner.
  3. 08EscapeHybrid

    08EscapeHybrid Moderator

    I don't know if it was stock jetting or not. When I bought the truck in the early 90's it already had 190,000 miles on it. The truck ran well, so I never messed with the carb. If it wasn't broke, I wasn't going to touch it for fear of making things worse than when I started. I did make minor adjustments to the automatic choke, but I never touched the jets.
  4. carrmann

    carrmann Well-Known Member

    in a bit of a arguement on a dodge truck forum. i mentioned putting the truck to max psi sidewall and several people are saying that it will be miniscule gains while also causing the tire to wear faster. I know this is true, but i cant remember where the reference came from (found it on this site). Does anyone know? Im hoping I can educate some people.

    Thanks in advance!
  5. 08EscapeHybrid

    08EscapeHybrid Moderator

    I have always run my truck tires at the sidewall max, and have never had abnormal or premature wear. The current tires on my 98 K1500 have ~30,000 miles on them, and they still look like new.
  6. carrmann

    carrmann Well-Known Member

    yea... i agree 08escape. however saying that to them will just make them say 'blah blah blah'. i coulda sworn there was some studies done or somethng that proved it.

    my trucks tires have been at sidewall max (and higher) for 4 years and still look like i could go another 30k miles on them lol.
  7. phoebeisis

    phoebeisis Well-Known Member

    I bet the old " too high pressure wears out the center of the tire" is a holdover from Bias
    ply tires.
    Old Bias ply tires REALLY changed shape when they were low-and a tiny bit when they were high.
    I wonder what your sidewall max will be.The Hemi Ram is maybe 1 week ETA?
    Does it come with LT or P tires?
    Sidewall will be maybe 50-55 psi?

    On studies- yes I think I've seen them here.

    One recent study it the " gliding distance decreased 50>60 psi" would give the anti high tire pressure guys some ammo. Not 25 cal pistol ammo- it would be 308 ammo!!
    Of course I think the decreased glide distance was just a statistical blip-tough to have exactly the same conditions.

    You won't win over the anti high pressure guys.Heck they have the auto companies(and tire companies) in their corner.

    You could make this point-a 3% decrease in glide distance will be about 40 feet in the 1400 feet I glide from 37>28mph. If I run out of speed 40 feet early-I have to hit the gas-4 gallons per hour- for 1/3600 hour(1 seconds) it will waste .001 gallons.
    My P&G cycle cycle will be about 1800 feet-8 seconds at 4gph 30 seconds at .8gph- if I have to add 1 second of 4gph- roughly .001 gallons it really hurts my FE
    My usual cycle is 1800 feet .0167 gallons - or 1800/5280/ divided by .0167 gallons=20mpg

    Adding just one second at 4mpg (1/3600) means .001 gallon per second.)
    .001/.017 is about 6%.
    My point is when you P&G a 3% increase in glide distance can easily be a 6% increase in FE. in city P&G.

    Your Ram will certainly be able to beat my Suburban in P&G cycles. Heck it has that "fuel shutoff feature-takes forever for my Suburban to drop to .8gph-and it will drop lower than .8gph in glides) .It also has cylinder shutdown- not sure if that will come into play?

    In any case I bet you can get 24mpg cycles which means something like actual city FE of maybe 18-20mpg!! Approaching GM two mode hybrid city FE( which usually costs buyers about $10,000 to get Tahoe hybrid-well $10,000+$45000)

    Yeah you can't win the tire pressure battle on a pickup site.
    Heck the older Hemi owners will have never even seen 14 mpg city-NEVER!!
    They probably figure your 3/4 ton numbers are an elaborate hoax!!
    Dodge Rams-until recently got HORRIBLE FE.
    The new Hemi-cyl shutdown EPA 20 MPG HY- get died and gone to heaven FE vs say a 2002 Hemi.

  8. herm

    herm Well-Known Member

    A lot of trucks still use bias-ply tires, mostly commercial I would think.
  9. phoebeisis

    phoebeisis Well-Known Member

    Really-I had no idea? 1/2 3/4 ton or big tractor trailers?
    If they are doing it commercially there is some $$$ advantage.
    Easier to retread?

    Learned something new today.I thought everything switched to radials 25 years ago.

    I do distinctly remember how easy it was to tell if a bias ply was at 20 psi-instead of 28psi(which was about normal tire pressure in 1965 or so). Heck I remember being surprised to discover one of our cars required 32psi-seemed sooooo high.
    Yeah bias tires looked flat at 20 psi-and normal was 28pi. Radials-can't tell 20 psi from 40 psi,

    PS- speaking of the hemi ram- I bet it will be a 20mpg city vehicle(in the lower 48 or summer in AK)-even without shutting off at redlights(which with a new vehicle is a realistic option-not an option with your 3/4 ton 1996??-I just switched to a good starter-might consider it with the 98 SUV if the new starter continues to convince me I've fixed my chronic starting problem),
    I wonder what the Hemi will use at idle?? Any of those Dodge guys have Scangauges?
    Last edited: Jan 4, 2012
  10. carrmann

    carrmann Well-Known Member

    their real 'defense' is increased wear and tear with the tires. Which would apply with bias plys.. not with radials.

    I am hoping to see 20s pretty consistently!

    I have the ultragauge... i'll let you know once i get the truck! my current truck uses .79 idling in gear with ac off, .89-.91 with ac on, and .85 idling in N with ac off. however i usually shut it off at lights (its fine, no issues at all).

    they probably think my 3/4 ton truck #s are a hoax. no one has even 'responded' to that comment. they have told me that if im driving it for MPG, im driving it wrong. to which i responded its a truck... not a hot rod, if I wanted to go fast I'd get osmething fast, not a 7000lb tank lol (no offense intended to anyone, they can be fast).

    many have belittled me, for asking for any simple/easy ways to improve the mpg on those. its crazy, I dont get it. its like they are offended that I asked!
  11. herm

    herm Well-Known Member

    small pickups, vans etc, bias ply tires can carry a higher load.. this is what my friends in the trades tell me. I think the 18 wheelers are using radial tires, and they re-thread them. When you get a chance look at a truck tire and search for the R or a B in the model number.


    take a look at the inflation pressures.. 45-115psi

    I think they choose bias ply for higher loads but it may for a different reason, perhaps a softer ride on rough surfaces or off-road?
    Last edited: Jan 5, 2012
  12. carrmann

    carrmann Well-Known Member

    got the tonneau cover purchased and installed. lookin forward to getting it. old man took it on a short trip, got apprx 17mpg with it after first tank (they dont know how full it was tho).
  13. phoebeisis

    phoebeisis Well-Known Member

    Is it coming this weekend? Like waiting for Christmas
  14. carrmann

    carrmann Well-Known Member

    i wish.. i get it on the 26th lol. got a extra set of wheels/tires for it already as well (alloys with almost new winter tires for $400 off craigslist).

    it is like waiting for christmas... ugh!
  15. carrmann

    carrmann Well-Known Member

    good reports so far for their drive! 17.9mpg first tankful, 18.9 second tankful. Thats with 2 people, 4 spare tires in the bed, plus a bunch of luggage! Also they drove through some snow etc.
    Last edited: Jan 22, 2012
  16. phoebeisis

    phoebeisis Well-Known Member

    Shoot- tough to wait!
    I feel like it is almost my truck!!
  17. carrmann

    carrmann Well-Known Member

    got it! love drivin it so far.

    anyone know how to put it into neutral, while still getting ECO mode to stay on (where it goes to 4cyl), it slows down too fast in gear even with eco mode ON. put it in N and it glides a lot farther, but runs in 8cyl.

    in terms of my ultragauge, when it goes to 'eco mode on' the gauge shows i am getting worse MPG. is there someway to get it to reflect that properly? it also shows the truck is burning gas while off, with the key in the ON position.

    sadly I wont be able to really test it out for mpg till after I get home. Im towing a dodge durango for my dad up to Navarre (my house). so I wont be getting great mpg.. :-(
  18. phoebeisis

    phoebeisis Well-Known Member

    Pictures and numbers when you get a chance!
  19. carrmann

    carrmann Well-Known Member

    pictures to come soon! gotta host em somewhere.

    it didnt do great towing close to 7000 lbs (4 spare wheels/tires, dodge durango, and flatbed car hauler). in 45-65mph areas I avgd about 13.5mpg. On interstate at 65 ish the best I think is going to be around 12mpg. Would have gone slower, but the old man doesnt do well on long car trips (he had a rough time comin down to fl).
  20. 08EscapeHybrid

    08EscapeHybrid Moderator

    IMHO, if your mileage wasn't in the single digits towing that much weight, you did pretty good.

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