Engine/Transmission (1998.5 - 2002) DIesel Dyanamics TTPM

[JCyrbok]

I'm looking for opinions and experiences, good or bad, with the Diesel Dynamics True Tourque Power Module.



I'm interested in any problems that occured and how the box worked. I'm particulary interested in the "timing only" setting and its effect on mileage. ALso was there any problems with advancing the timing on the VP or other stresses that the box put on the truck. I'm not "looking" to increase the power of my truck but like the benefits of better mileage. Does anyone see a problem with running the timing only setting on my un-modified truck? I only have a Scotty II and other than possibly a 4" exhaust this spring that is how it will stay. I'm looking to get over 400K out of my truck, that is my goal. I only have 22K on her now.



ANy info, comments, opinions good or bad will be greatly appreciated.



Thanks

J-

 

[Devildog]

I have one....

I lost fuel mileage, But, I can't seem to keep my foot out of the throttle It works well.

 

[jwilliams3]

I have one too (its around here somewhere!)

It works well, and has never failed me.



Its basically an Edge EZ marketed by Diesel Dynamics.



--Justin

 

[Chipstien]

I had one before I sold it for a DD UFM. I loved it till I realized what a UFM could do. For you though it would be great addition. Had to unplug the TTPM a couple times for dealer trips and didn't realize how much those boxes do till you drive without it. Go for it... ... you can't go wrong. Oo.

 

[LSMITH]

It is gonna take most of that 400K miles to pay for the box in fuel saved if you gain the whole 1 MPG that you MIGHT get... ... .



Not a good buy IMO when looking for fuel economy, some trucks actually LOSE economy with the extra timing. You may gain, you may lose, it might stay the same.

 

[TomGolden]

My experience:



First 12K miles truck was absolutely bone stock. Got 16. 0 MPG

towing or not towing.



At 12K miles, installed DD3's and TTPM, K&N air filter and 4"

exhaust. Mileage went up to anywhere from 17. 5 - 19. 2 MPG,

depending on what type of driving or traffic I am in.



Went to a drag Comp about a year later. Oo. Oo. Oo. oh my... . what a difference!

 

[rblomquist]

Had mine for less than a week now but WOW, the power is nice, especially when you're in lockup and give her some go-pedal. Based on my computer (which is fairly accurate on the mileage) I'm up about 3 (yes 3) MPG over stock, and that's with the box set on 3.



Of course I'll have to see how it pans out over time but right now I'm real happy with it.



I'd do it again in a heartbeat.

 

[LSMITH]

Originally posted by rblomquist

Based on my computer (which is fairly accurate on the mileage) I'm up about 3 (yes 3) MPG over stock, and that's with the box set on 3.

Your computer is now a lying miserable overestimating unreliable rotten low down... .



You get the point, your mileage is NOT up 3, but the computer thnks so. The box fools it by adding power so you use less throttle for typical driving. The fuel is being burned, but the computer does not see it. You are now in the pencil and paper mileage figuring club. Mine is off by about 5. 5 MPG now. Injectors fool it as well.

 

[rblomquist]

Thanks for the forewaring, I'll have to check it out when I fillup in a couple of days. I always do the pen-and-paper thing anyway and what I was finding was after I changed to 265s vice the stock 245s the computer was pretty close to spot-on.

 

[plongson]

So what is the story on the computer??? I assume that it uses some sort of flow device that measures the amount of fuel that passes by a given point. If that is the case it should not matter what the motor is doing, and should be as accurate as it was before. IF that is NOT the case (the amount of fuel that passes by a given point) and the fuel is NOT running through a flow device, then the whole computer thing is a sham... Perhaps I don't understand the basics of this system... . but why would improving efficiency throw off the computer's caluclations. I found minor deviation in the computer from the P&P method (as you would expect) but would be surprised if there was a huge differance if the only change was in timimg, boost etc. and not in tires , gearing etc.



Just my 2cents worth... .



Paul...

 

[LSMITH]

Originally posted by plongson

I assume that it uses some sort of flow device that measures the amount of fuel that passes by a given point.

Paul...

Negative ghostrider. It uses several inputs to decide what the fuel consumption should be. Throttle position, RPM, and speed are used, and maybe some more. The main one that gets us into trouble is throttle position, if the engine makes more power we use a lesser throttle position to maintain speed when driving. It interprets this as less power used, which is not the case. Flow would be tough, as it would take 2 flow switches. One for input, one for return, and an algorithm to decide what the fuel ecomony is when provided vehicle speed and the difference between input and output to the return of the injection pump.



If we were not bypassing the ECM in our attempts to get more power the accuracy would be fine.

 

[plongson]

Dodge must assume that, of all the tens of thousand units produced, that there is a VERY small variance in the engine output, in relation to throttle position to retain accuracy. RPM and speed must remain constants in the calculations



Not a bizarre thought process for an engineer or a marketing type, but sure seems outrageous to me...

 

[Chipstien]

Hey Lsmith, are you trying to burst my bubble. According to my computer I am getting 24 miles per gallon with 486 HP. Are you telling me I am not. :{

 

[Tom G]

TTPM

Hi JCyrbok:



Have one and it works very well. Use it on the TIMING only setting since adding any extra power on my truck will cause the torque converter to slip. Have tried the power settings a couple of times while running empty and it FEELS like the 50 hp they advertise.



However, I didn't buy it for the added power but for the timing only position.



First I DID notice a small increase in mileage; maybe about 1 to 2 mile per gallon depending on conditions. Its very difficult to tell even doing manual fuel calculations.



The BIGGEST help was in reducing my Exhaust Gas Temperature [EGT] readings. They DROPPED by at least 50-150 degrees depending again on conditions.



Before installing the TTPM the typical EGT readings were 1250-1300 degrees and a few times 1350 degrees before I backed out off the pedal. This is towing a 25' 5th wheel.



Now I never see more than 1100-1200 even on long hills with the petal to the metal and that is without doing the turbo boost hard line modification. So I am still only running 20 psi boost which is fine for the timing only position. Installation of a TTPM could not be simpler - it is a simple Plug and Play operation.



DON'T forget to ask for your TDR discount. I have e-mailed Diesel Dynamics a couple of times and they always answered my mail in a day or two. I would rate customer service and technical support as excellent.