Dynojet results: InMotion vs. GDE

DOC4444 · **Posted:** Fri Jul 10, 2009 5:57 pm

2005 CRD Ltd with about 50K miles, stock suspension, wheels and tires, disabled viscous heater and aFe air filter. TC replaced in factory recall @ 17K. (See previous dyno results in Tech section.) DynoJet chassis dyno:

I started with the GDE ECU so it would be fully optimised. SEGR was engaged so there would be no difference when I ran the IM Stage II ECU. A new fan clutch has recently been installed. (May sap a little power over the original '05 clutch.) CAT has been cleaned out and a Magnaflow catback exhaust has been installed. Cummins intank pump has also been installed.)

All numbers are an average of three runs, each, but they were so close that averaging really wasn't needed.

All runs were done on a Dynojet chassis dyno in Drive with OD off.

We got peak power of 168.3HP @ 3500 and 307.8 lb/ft @ 2500 with the GDE ECU.

Then I installed the InMotion and did three runs.

We got 180.8 HP @ 3500 and 328.7 lb/ft @ 2530

This was an increase of 10 HP and 25 lb/ft with the IM ECU over the runs I made a year ago on the same dyno, comparing the stock ECU with InMotion, The CAT "clean", new exhaust, SEGR and lift pump may account for the improvement. (At the time, the stock ECU put out 144.6 HP and 250.6 lb/ft.)

Other observations: With the GDE ECU, I simply have been unable to get the TC to shudder (not towing), which is remarkable, considering the power output. (Shudder, with IM ECU, even with 2 tubes of "Dr. Tranny" installed, was severe, even with empty vehicle, towing nothing.)

I had a chance to assess while towing (3K horse trailer). Going up a modest grade on the highway, I was accelerating ever so slightly @ 55MPH. I assume it was in 5th, unlocked. The shudder started. I did not alter my position on the pedal at all. The shudder lasted only about 1.5 seconds and then the trans downshifted, lifting the revs to about 2300. (IM required backing all the way off or downshifting manually to address this.) All in all, very impressive how they worked that all out.

Based on the EVIC, overall fuel mileage looks like it could be at least 3 MPG better than InMotion, but I have to run through a couple tanks of fuel to be sure.

Moderate speed mileage, in particular, seems much improved over stock and IM. General driveability subjectively seems smoother than with IM ECU.

DOC

Joe Romas · **Posted:** Fri Jul 10, 2009 6:52 pm

Doc.

Thanks for being the first to report dyno results comparing InMotion and GDE tune and giving your unbias report. I'll take smooth and better fuel mileage over ragged and rough any day

DarbyWalters · **Posted:** Fri Jul 10, 2009 6:56 pm

Both the IM and GDE certainly return much better numbers than stock ECU. I would be happy with the GDE numbers and improved mileage and TC protection.

Thanks for the posting of the dyno run info...very helpful.

BlackLibertyCRD · **Posted:** Fri Jul 10, 2009 7:04 pm

I'm running the ORM and predator stage II chip. It runs like a scalded cat with no shutter. Sounds like the f37 is in the GDE and removed by IM. Shift points should raise as soon as the engine starts lugging or you will have problems. BTW I posted a thread of towing in 4th gear gives much better performance and fuel mileage. Who would of thunk? :lol:

Pablo · **Joined:** Thu Feb 02, 2006 10:06 pm **Posts:** 1201

BlackLibertyCRD wrote:

I'm running the ORM and predator stage II chip. It runs like a scalded cat with no shutter. Sounds like the f37 is in the GDE and removed by IM. Shift points should raise as soon as the engine starts lugging or you will have problems. BTW I posted a thread of towing in 4th gear gives much better performance and fuel mileage. Who would of thunk? :lol:

F37 has nothing to do with this, InMotion tune does not remove F37. GDE tune does not "install" it.

DarbyWalters · **Posted:** Fri Jul 10, 2009 9:14 pm

Pablo wrote:

BlackLibertyCRD wrote:

I'm running the ORM and predator stage II chip. It runs like a scalded cat with no shutter. Sounds like the f37 is in the GDE and removed by IM. Shift points should raise as soon as the engine starts lugging or you will have problems. BTW I posted a thread of towing in 4th gear gives much better performance and fuel mileage. Who would of thunk? :lol:

F37 has nothing to do with this, InMotion tune does not remove F37. GDE tune does not "install" it.

I thnik what he is saying is the same "school of thought" is in the GDE as the F37 but done with still improved performance numbers. They both (GDE/F37) address the shutter with a change concerning torque and shifting.

CRDMiller · **Posted:** Fri Jul 10, 2009 9:38 pm

DOC4444, Thank you, very much, for taking the time and expense to purchase and test these units, and then post the results here.

I deeply appreciate it.

ribbon · **Posted:** Fri Jul 10, 2009 10:17 pm

a little off from the claimed hp / tq but good mileage is good. I too would take the mpg over the power. if they still were doing the special i would jump all over the GDE tune. Didnt have the green at the time :cry:

RTStabler51 · **Posted:** Fri Jul 10, 2009 10:36 pm

ribbon wrote:

a little off from the claimed hp / tq but good mileage is good. I too would take the mpg over the power. if they still were doing the special i would jump all over the GDE tune. Didnt have the green at the time :cry:

Not really as their 'claimed' numbers are based at the flywheel, as are the stock numbers from the manufacturer. If anything, its even better than what they claim.

dritchie · **Posted:** Sat Jul 11, 2009 10:27 am

ribbon wrote:

a little off from the claimed hp / tq but good mileage is good. I too would take the mpg over the power. if they still were doing the special i would jump all over the GDE tune. Didnt have the green at the time :cry:

X2...I think if they sold it at the intro price they would sell 4x as many and make more money in the long run. I too would pay for one at the intro $$, but not at $550.........

Dave

stoutdog · **Posted:** Sat Jul 11, 2009 10:32 am

It would be interesting if you could dyno the GDE with SEGR and GDE w/o SEGR. That would put some hard numbers on how much GDE really does turn off the EGR!

ribbon · **Posted:** Sat Jul 11, 2009 11:56 am

ah your right claimed is flywheel. I'm still pretty much sold

bugnout · **Posted:** Sat Jul 11, 2009 1:24 pm

Thanks for posting your results.

Lancer · **Posted:** Sat Jul 11, 2009 2:54 pm

Thanks for this Doc, it is very helpful indeed. It confirms my view from reading Bugnout's and others posts that the GDE is the way to go (when I'm back working and have the money

)

butcher_block · **Posted:** Sat Jul 11, 2009 5:06 pm

do you have pictures of the curves
how wide are they say over 230ft lb

chrispitude · **Posted:** Sat Jul 11, 2009 5:43 pm

stoutdog wrote:

It would be interesting if you could dyno the GDE with SEGR and GDE w/o SEGR. That would put some hard numbers on how much GDE really does turn off the EGR!

A better confirmation would be for someone to read intake temperatures with a Scangauge under the GDE tune. The EGR increases intake temperatures significantly over ambient (there are forum posts with comparison readings).

- Chris

DOC4444 · **Posted:** Sat Jul 11, 2009 5:51 pm

stoutdog,

Determination as to whether the GDE ECU really keeps the EGR valve closed most of the time is very unlikely to be accomplished with chassis dyno testing in terms of impact on power output. I could have disabled the SEGR and done some more runs with the GDE ECU, but this was discussed with people much smarter than me beforehand and the consensus was that it would be a complete waste of time and money.

However, If you would like to donate the $$ to have me repeat all the dyno testing and include additional test parameters, like with/without SEGR enabled, I'll be happy to do that.

(My guess is that you just need something like a VAGCOM for DCJ that allows you to monitor individual parameters, such as EGR activity, and just drive around and watch it. At least, that's what I can do with VAGCOM and a VW/Audi.)

DOC

stoutdog · **Posted:** Sat Jul 11, 2009 5:54 pm

Doc, it was worth a thought... thanks for the reply.

Christ might be onto something though...

DOC4444 · **Posted:** Sat Jul 11, 2009 6:15 pm

butcher,

Can't get a good scan of the curves, but to answer your question, both IM and GDE make at least 230 lb/ft from 2300 to 3700 on the dyno sheet. However, since an inertial dyno was used in conjunction with an automatic, I don't think the low rpm numbers are very accurate. My guess is that the motor makes at least 230 lb/ft well below 2300. I have a lot more confidence in the upper RPM numbers, though, namely that torque at the rear wheels drops below 230 over 3700 RPM.

DOC

Pablo · **Joined:** Thu Feb 02, 2006 10:06 pm **Posts:** 1201

stoutdog wrote:

Doc, it was worth a thought... thanks for the reply.

Christ might be onto something though...

Yeah, they say he is the way, the truth, and the life.

I have a scanguage and the GDE tune, but I have the SEGR installed... otherwise I would report the data for you.

Dynojet results: InMotion vs. GDE

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