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Unread 07-30-2008, 09:26 AM   #151
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Quote:
Originally Posted by Three Oh DSL View Post
Cool. Were you able to upload the charts?
Here it is!

dyno.jpg  
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Unread 07-30-2008, 09:57 AM   #152
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Here's a stock comparison:
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Unread 07-30-2008, 10:09 AM   #153
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It looks like my torque is almost at the stock level, however it sure feels a lot higher while driving.
Fellow at IPS Motorsports was little unsure how to dyno AWD GC, at first they wanted to disable front axle electronically, but I wanted it done the right way. Also they had hard time keeping truck in 3rd gear, so they ran about 5 different attempts before producing this chart. I think this chart might not be entirely accurate, but probably close enough. All I wanted to see is proof that tuning box makes any difference and I got that.
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Unread 07-30-2008, 10:10 AM   #154
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Dumb question... but was that a third-gear pull?
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Unread 07-30-2008, 10:13 AM   #155
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Ah okay. Yeah you can definitely see a difference. I looked up the ratios for the transmission. Fourth gear is 1:1. This may explain why your curves are offset.

There's no question in my mind that the Brabus box made an improvement.


EDIT:

Quote:
Originally Posted by DieselPowerMag.com
The Jeep Grand Cherokee we tested was equipped with the full-time Quadra-Drive II four-wheel-drive system. To get all-wheel-drive dyno numbers, we enlisted the help of the Subaru/Mitubishi masters at Yimi Sport Tuning. Everyone was shocked when the Jeep produced 198 hp and 371 lb-ft of torque at the wheels (manufacturer ratings are 215 hp and 376 lb-ft of torque at the crankshaft).

I would venture to say your max numbers are noticeably higher. Third is 1.41:1. I wonder if its possible to calculate the corrected output using the ratio difference?
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Unread 07-30-2008, 10:24 AM   #156
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why was third gear chosen to dyno??
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Unread 07-30-2008, 11:49 AM   #157
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I do not know, he said that he needs to get it in third gear and keep it there. I am not into all that stuff and only reason why I did it is because I wanted to post some results here. I never dynoed anyting in my life and these guys seemed like they knew what they were doing. So, if they were taking truck through all 5 gears, it would have given more accurate curves?
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Unread 07-30-2008, 12:06 PM   #158
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Quote:
Originally Posted by Mish_Mish View Post
I never dynoed anyting in my life and these guys seemed like they knew what they were doing. So, if they were taking truck through all 5 gears, it would have given more accurate curves?
No problem! That's why we're here.

When you run a dyno, the transmission should be in a gear which has a ratio of 1:1. This gives a more accurate representation of power since the engine and drivetrain are turning at the same speed. When a dyno run is made in anything other than the example, the power is multiplied or divided, depending on the ratio.

I would imagine you could use math to calculate the corrected output regardless of the ratio, but I do not know what that might be.

Generally, a transmission uses a 1:1 ratio on the gear just before top-gear (i.e. a 4-speed trans will have a 3rd gear ratio of 1:1). In the case of our 5spd transmission, 4th gear is 1:1.

If this is the case, I am pretty confident your Jeep is making the power promised by Brabus. -Which is really impressive for a 3litre diesel at the wheels!!

-Hope this makes sense!
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Unread 07-30-2008, 12:09 PM   #159
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Quote:
Originally Posted by Three Oh DSL View Post
I would venture to say your max numbers are noticeably higher. Third is 1.41:1. I wonder if its possible to calculate the corrected output using the ratio difference?
it is possible but who is to say that it wasn't corrected??

that's not a very big jump from stock with that box though... kinda makes me question it
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Unread 07-30-2008, 12:15 PM   #160
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Originally Posted by Three Oh DSL View Post
If this is the case, I am pretty confident your Jeep is making the power promised by Brabus. -Which is really impressive for a 3litre diesel at the wheels!!
how would that be? the 1.41:1 ratio should yield #s higher than that of a 1:1
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-and a bit of wrench work on some 07 CRD which is heavily UN-modified... lol

Last edited by mister17_5_9; 07-30-2008 at 12:33 PM..
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Unread 07-30-2008, 12:19 PM   #161
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Hmm... I guess that's possible... Interestingly, the DPM people say the Jeep was making the advertised power at the wheels in stock form. So should we assume that stock crank power is only 16hp and 3tq lower than the Brabus enhancement?


Is this what the CRD is really making in stock form (at the crank)?
256hp & 447lb.ft ?

215 * .19 + 215
376 * .19 + 376

----Something isn't adding up here.. Maybe it's just me?

Last edited by ----; 07-30-2008 at 12:42 PM..
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Unread 07-30-2008, 12:28 PM   #162
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idk it's one of three things... the box wasn't turned up (if it is variable), it is faulty, or the dyno was not properly calibrated... there's only one way to know for sure...

get it on the rollers somewhere else...
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Unread 07-30-2008, 12:32 PM   #163
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Too bad TPG Tuning never brought the dyno to Motown...
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Unread 07-30-2008, 12:33 PM   #164
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Originally Posted by Three Oh DSL View Post
Too bad TPG Tuning never brought the dyno to Motown...
uhhh yeaaaaaaa
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Unread 07-30-2008, 12:43 PM   #165
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Quote:
Originally Posted by Three Oh DSL View Post
Is this what the CRD is really making in stock form (at the crank)?
256hp & 447lb.ft ?

215 * .19 + 215
376 * .19 + 376

----Something isn't adding up here.. Maybe it's just me?

or maybe it's the box or the dyno... but that much parasytic loss would not surprise me out of a four-wheel drive system that has to be pretty beefy with an auto to boot
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-and a bit of wrench work on some 07 CRD which is heavily UN-modified... lol
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