Diesel Dynamics DD2's and 30 mpg!

[BLACKRAM]

Yes, you read that correctly. On a two way run between Louisville, and Cincinnati the trip computer reads 27. 9 and 28. 4 respectively. Compute the odometer error for my oversize 285 tires (9%) and you get 30. 41 and 30. 95 mpg respectively. I also checked this run by refilling the tank, and get almost the same reading. This was at 70-72 mph, unloaded, with cruise. #ad


So for all you lurkers out there, not only does this truck develop serious power, but my mileage has gone up as well. The mods are listed in the signature. My effective gearing due to the tires is 3. 21. The engine is just loafing along at this speed.

I also have the DTT vb/tc and that is one fine product. The products did EXACTLY what the Bill K. and the guys at Diesel Dynamics said they would. My temps are not exceeding 1200 at sustained WOT, and I can only get a puff of smoke from a dead stop when I nail the throttle. The DD TTPM is on setting #2. #ad
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1999 2500 4x4, auto, 3. 54 LS, HD241, Quad cab SLT, Blk Sport Pkg, 16x8 Eagles, 285 Bridgestone AT, Amsoil, 80/100w lights, Valentine One, DTT TC/vb, DD2's, DD TTPM, Isspro gauges.
1992 SC400
1978 Mooney 201 IFR

 

[Marco]

If you say that you believe that numbers,
then I believe, that you believe it! #ad

 

[BILLYGEE]

What does your tach show at 70-72mph?What about boost and egt? I'm just curious.

 

[BLACKRAM]

Tach reads 1800-1850, and boost 4-6 lbs.

 

[Jetson]

The trip computer doesn't know that you changed injectors. It's wrong.

 

[Archive]

Jetson, you should know from your space age username that computterrs dun't makey nistakes... ... ...

 

[joel]

I"m sorry, I just can't buy that as much as I'd like to. Are you sure you're not making the tire adjustment the wrong way??

How many miles did you travel on these trips and how many gallons did you use? What factor did you use to compensate for the tires?

[This message has been edited by joel (edited 03-23-2001). ]

 

[CUMINNTSTRKN]

30 seems high but maybe not. my trip computer always shows at least 27mpg and i usually get 17mpg on the highway at 79mph. if your trip computer is working with the 2's want to trade me computers? all my computer is good for is temp.

jim

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2001 eth, ez box, dd2's
My Ram Pics

 

[JyRO]

I'm with Jetson & Joel - no friggin' way. #ad
No offense or anything, I just think you've made some serious math errors somewhere. No way you're gonna get that with an auto, and all that performance stuff. AND, THERE'S NO WAY YOU SHOULD TRUST THAT COMPUTER. It's got gremlins in it (digital gremlins). #ad


I'll be down in Georgetown tomorrow (3/24), why don't we meet up and you can follow me back to MI. at 65 mph. #ad
Hehehehe. (see post in 2nd Gen, 550 mile, "certified,"... . ). I know my odometer is correct. We can fill'em up at the same time and do the math then.

- JyRO

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Y2K 2500 Cummins ETC/DEE, SLT+, 4X4, Quad, LB, Intense Blue Sport, 3. 54 LSD, rear aux. springs (camper special), sliding rear window, all options except cab clearance lights including agate leather, totally stock engine, silencer ring removed, "stealth," mod to run fogs with high beam. (20. 8 mpg @ 70 mph) Since everybody else listed their toys, I will too.

2000 Toyota 4Runner SR5 4X4, 5-speed, 3. 4L V6 (25. 5 mpg @ 65 mph)
1995 Kawasaki ZX6-R, 97 H. P. @ Rr tire, 6-speed, . 6L I-4, 410 lbs. wet
- (60+ mpg @ 65 mph, but who can do that?) (For Sale)
1990 Toyota Celica STX, FWD, 5-speed, 1. 6L I4 (36+ mpg @ 65 mph)
1983 Mazda RX-7 GSL Limited Edition RWD, 5-speed, 1. 1L Wankel (For sale)
No auto trannies in my home! Just say, "No!" to auto trannies.

 

[Joseph Donnelly]

The trip mpg box uses the ecm to compute fuel usage. Bigger injectors and boxes that clip to the pump solenoid wire both fool the ecm by delivering more fuel than it knows about.

 

[SmokinJoe]

Originally posted by 2000ney:
Compute the odometer error for my oversize 285 tires (9%) and you get 30. 41 and 30. 95 mpg respectively.

Ummm

NO

Tell us the miles and the fuel...



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2001. 5 QC 2500 White Sport 4x4 LWB ETC 5-Speed Anti-Spin 3. 54 Trailer Tow 241HD SLT+ Tan Leather(Mad Cow Disease) LT265/75R16E

 

[Homicide]

30 MPG... .

Hmmmmmmm.

On 300 mile trips doing 70 to 75 going down a flat I-5 freeway, with the same tires and gearing, etc, I'm only getting 18. 5 at best... . and that is dividing miles by actual gallons (filling up the end of fill neck), and computing for the larger tires.



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1999 2500 Quad SLT, 4x4, Auto, SWB, white with Agate leather interior, all options except fog lights. Very happy with the changed 4. 10 gears to 3. 55. 285/75 tires. Towing a '96 21ft Boston Whaler Outrage with 225 hp Johnson and galv. TT. Getting ready to BOMB because the Dodge is a little doggy towing the Whaler and my big butt. Bomb run #1, Edge EZ box. Next???

"Rice power will never compare to Cummins power"

"LIFE IS TOO SHORT FOR CHEAP BEER and/or DODGE PARTS"

 

[David_VT]

OH WHAT A FEELING!! until you discover that the trip computer is now inaccurate due to the injectors.

Been there done that!

You are getting better mileage, but not what that thing is telling you.

As a hint, reset the computer when you are near the end of the tank. You will see it doing some fancy footwork regarding the MPG vs MILES to GO. (just don't run the truck dry doing this test)

 

[BLACKRAM]

Right, except for the fact that I drove 112 miles and used 3. 7 gallons of fuel.

The truck got a consistent 21-23 mpg before the mods (hwy).

 

[Murle]

Sure glad I got my boots on. Getting a little deep around here. #ad

 

[PRout]

Did you account for tire size? you may actually be closer to 35mpg?

After I installed my reverse bismolic attenuation actuator and filled it with cox airplane fuel, it did actually get 42mpg. Really. The only problem, is I had to start it with a big windup spring.

[This message has been edited by Shortshift (edited 03-24-2001). ]

 

[csutton7]

2000ney--is that all downhill with a wind behind ya--just kiddin'--hey guys read his original post, he said he checked it by filling the tank===gallons used to miles driven--that's what you did 2000ney right-you double checked by the never fail method---awesome is all I can say--chris

 

[JohnMcIntyre]

<font color = blue> Hmmmm, I'm off to see Bill K. myself in a few weeks time and my return trip to California will be I-5, I-90, I-15, approx 1500miles running empty. I'll be real pleased if I can get anywhere near those figures, because I then take my 4000 pound camper and head East for 5,000miles before shipping the truck and camper back to Europe ..... oh yes, and the dreaded US$4. 00/gallon price tag. #ad
Oh well my truck is worth it! #ad



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JMc

2001 Flame Red Sport 3500 QC, 5. 9L 24v Cummins, 4x4 Auto, 3. 54/LSD, 155 inch WB, Agate leather, Camper Special & Trailer Tow Groups , Sliding Rear Window, WAAG sidetubes with dually kickouts, Line-X UTR Bedliner & underseal, Grover Airhorns, Lance 1130 slide-in Camper, 60 gallon Aerotank, RS9000s, Reese Titan class 5 hitch, Roadmaster XX, in planning stages... . HX35/14cms turbo, SPA Dual Gauges, Mag-Hytec, Exhaust Brake with Bill K. mods, DD 4" exhaust, DD2s, Rickson 19. 5" wheels, , Bill K. VB & TC.

[This message has been edited by JohnMcIntyre (edited 03-24-2001). ]

 

[Murle]

Forget the hip boot and save the watch. Put your hands above you head. #ad

 

[JJMiller]

Is there any way to reflash the trip computer so that it gives accurate mileage and distance-to-empty readings for trucks with non-stock injectors?

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John Miller

'01 2500 Quad Cab, ETC-DDX, SLT, Long Bed 4X4, Tow, Travel, 3. 54, Camper spl, Forest Green, Line-X
bed liner, silencer ring removed