Bombing vs. Mileage?

[Archive]

Along the same vein as Donnelly's "better mileage" post, how much power is too much for good mileage? I know it is a bell curve, and at some point your mileage will fall off, but how far can we go until THAT point?

 

[Archive]

BCFAST, I would concider my truck Bombed in about the middle(see Sig) My fuel economy has gone up not down, towing is way up. That is as long as I keep my foot out of it. (very hard to do #ad
#ad
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Dee'sel
97 2500 Club 4X4 3. 54, Forrest Green/Driftwood, LSD 5 speed, K&N Air filter RE0880 & Psychotty, TST #11 all the way forward, #12 for winter, AFC spring kit, Geno's Exhaust Blanket, TST EGT gauge & TST 0-60 boost gauge in A Pillar, Hypo clutch ass. , Cat-be-gone, 4" Dynomax Bullet muffler, Crome 4" turn down, AmsOil ser 2000 75W-90 in Trans, Geno's trans filter kit, AmsOil ATF In Transfer case, AmsOil 15W-40 Oil W/ Bypass system, AmsOil Ser 2000 75W-90 in front & Rear ends, Lund Winter front, Leer Cab Level Shell Driftwood , 235/85R16 Goodyears, Dyno'd 342 HP *NRA/USPSA member and proud of it*



[This message has been edited by drawson (edited 08-23-2000). ]

 

[Archive]

With 275's only my in town mileage is down about . 5mpg (not from racing either #ad
) and towing is down about 1. 2mpg. Power increase was nice but at a cost.

All mileage calculated using miles gone/gallons used with a calculator. Ordered without the overhead electronics.

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'99, 3/4, QC, SLT, 4x4, ISB, 5sp, 3. 5xlsd, tow pac, HD tcase, tow mirrors, camper pac, White over driftwood, Mist gray interior. 4-sale with less than 17,000 miles.

[This message has been edited by BV (edited 08-25-2000). ]

 

[Archive]

I added the Va and got over 1 mpg better. Than I added the P. S. boost module and now am getting over 1 1/2 mpg better. Dont know why the boost module added fuel economy but it sure did.

 

[Archive]

BV and Big Barney,

Are your milage reports based on odometer readings and fuel up calculations or the overhead computer.

Just curious.

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<font color=#990000>~<font color=#990000> '99 2500 SLT <font color=#990000> ~ QC ~ 4X4 ~ LB ~ Auto ~ 4:10 LSD ~
<font color=#000000>*<font color=#990000> BD E-brake<font color=#000000> *<font color=#990000> BD Autolock<font color=#00000> *<font color=#990000> Gear Vendor OD<font color=#000000> *<font color=#990000> Jordan Research T-brake <font color=#000000> *<font color=#990000> Bullhide spray-in Liner<font color=#000000> *
<font size=-2>... Lookin' for the 'RE' to go next to my 'TIRED' so's I got more time to Play!... <font size=-1>

[This message has been edited by Rattlin (edited 08-23-2000). ]

 

[Archive]

in-town mpg's (urban mix-60%stopngo/40%freeway accel/decel) suffered a bit from 16-17ish to a fairly solid 15. 5 when mine went from stock 180-ish (12-valve) to estimated 300-ish----I suspect more due to the built-in mpg penalty of an automatic, becoming more pronounced as you approach the limits of the stock TC, not due to hitting the downhill side of the efficiency curve---my highway mpg boinged up from 18-19 to a really #ad
21 (more % of time in "lockup")


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BOMBed 98. 4 1B7KF23D4WJxxxxxx

 

[Archive]

Rattlin

I calculate mine Miles driven divided by gallons. I'm now up to 18. 5 around town and 21 freeway. This is driving unloaded, But I do have a 500lb camper on the back which sticks up from the roof line a little bit. I'm sure I would do a little better if I had a flat shell on it instead.

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99 4X4 6speed combo guage from genos, Bright red, callen camper, VA, PS Boost module

 

[Archive]

I Havent cracked 20MPG with my 2500 4X4ETH yet,but the VA is coming. I have the 265 tires so I need to check my odometer against some mile markers next road trip; I have done all my calcs just with odometer and havent even checked to see if its off, hope it is off a litle. I have barely been over 18MPG. I hope the VA helps. I think we should start a club of bombers called "MPG Bombers".

 

[Archive]

My poor old sickly Ram gives about the same mpg in town, and better on highway, compared to stock. Therefore, the threshold must be somewhere over 510 hp #ad
Of course, I expect mpg would go down somewhat if the extra power were being used all the time #ad


The point is this: diesel mpg is largely a function of the right foot, unlike gassers which give crummy mpg after being hopped up, even when they are driven easily. Secondly, it is important to use a good systematic approach to modifications so the stuff works well together and does not heavily impact use of the engine at low power levels.