Dyno procedure for Cayenne

[ultra]

Does anyone have any specific advice or a procedure for putting the Cayenne on a four wheel AWD rolling dyno?

eg. PSM traction control, locked diffs, Low Range / High Range / on-road off-road, suspension settings, ride height, ramp rates, etc.

Also does anyone have any good dyno readouts for before and after mods? Cayenne S and Cayenne Turbo charts would be good to see as I haven't found many on the various forums. Everyone promises to upload after their mods but never do...

I'm looking for comparative data from Mustang / Mainline / DynoDynamics rolling dynos as opposed to hub Dynapak dynos.

Edited April 4, 2012 by ultra

[hahnmgh63]

Any real 4wd Dyno, not a 2wd w/rollers. No locked Diff's but do turn the PSM off, it will just cut power if anything, ride height doesn't matter, and you don't want that when you want accurate absolute readings. In my experience Mustangs seem to be a little more conservative than Dynojet's. Find a place that does Audi's or the Subaru WRX crowd then you just have to see if it is set up with enough adjustment to do the Cayenne's wheelbase (112.4").

[ultra]

Any real 4wd Dyno, not a 2wd w/rollers. No locked Diff's but do turn the PSM off, it will just cut power if anything, ride height doesn't matter, and you don't want that when you want accurate absolute readings. In my experience Mustangs seem to be a little more conservative than Dynojet's. Find a place that does Audi's or the Subaru WRX crowd then you just have to see if it is set up with enough adjustment to do the Cayenne's wheelbase (112.4").

Thanks for the advice :)

I ran on a proper 4WD dyno (Mainline) that is popular with the AWD crowd (WRXs, Skyline GTRs). It easily accommodated my Cayenne's wheelbase and we turned PSM off.

I was a little disappointed with the results (228kw / 306HP at the wheels) as we thought that it would make a lot more as it is not stock, hence my question re locking the diffs or other fancy tricks.

I have found that Mainline dynos used here are fairly conservative compared to the Dyno Dynamics ones (I don't believe that we have Mustang Dynos in Australia) but the Mainlines are consistent across the workshops in my state whereas there is some variation with the DD's here. The Mainline that I ran on is the one that had been used for state level dyno competitions over the last years and has been particularly consistent for us.

While I would expect drivetrain loss with the Cayenne's AWD system and maybe my heavier wheels (21" Porsche Sport Design), I didn't think that I would get such a low reading with a cat bypass and aftermarket exhaust in place. Tires were new 295/35 Pirelli P Zeros.

However, I accept that the dyno should be used as a comparative tool and is not absolute.

I'm going to fit a pair of BMC filters and dyno again to see what difference that makes to my current config, then install the IPD plenum and dyno after that upgrade.

I have also organised to run back to back against a friend's CTT which is almost the same build month and is totally stock (aside from 20" wheels + Gemballa lowering kit) with no intake or exhaust modifications for a relative baseline reading. If his puts down a better number, then there is something seriously wrong with mine or I should consider getting rid of the bypass and exhaust!

More data in a few weeks...

Edited April 13, 2012 by ultra

[hahnmgh63]

I take it from the upcoming comparison then that yours is a Turbo? If so, that does seem a bit low. I don't think you'll really see any difference with the Air Filters as the stock air boxes are German paper filters are pretty good. I've seen some back to back Dyno tests of Audi S4's & RS6's with both BMC & K&N filters and negligible changes, some slightly higher, some slightly lower, more of changes attributed to heat soaking a bit, even with a cooling period & fan. I don't think you can beat the Mann or Mahle paper filters for keeping the air clean and the MAF's alive.

[ultra]

yep, mine is a first gen Cayenne Turbo with the 4.5 TT V8

I'm really not sure why the dyno numbers were as low as they were (three similar runs after letting the vehicle cool down with the hood up for 30min pre dyno testing). my dyno operator thought that it would have more in it too as the big piggy seemed to be able to put out more power, but we couldn't get it to at the time.

I don't think that I have cracked coils as we didn't detect anything like that at the time, but I do have a fresh set of pencils ready to go in just in case.

I guess that the best test to highlight any issues would be to run my friend's stock CTT vs mine back to back on the same dyno within the same hour on the same day. I might hold off my intake upgrades until then.

I have noted the reports about fouled MAFs with the oiled filters and hope that I can reduce the incidence of that by letting my BMCs dry out a bit in the heat this week.

will keep you guys posted. stock vs mine comparison will be in four weeks time.

[gasguzzlingV8]

Ultra,

What was the outcome of your comparisons and did you ever get to the bottom of why you were only putting out 306HP at the wheels?

Regards

Chris

[ciaka]

Can you do us a favor and give us update on any gains after BMC filter add, and any gains after ipd plenum add?There has been some discussions about how much gain each makes, and your plan may help provide answers to this. Thanks in advance.

...I'm going to fit a pair of BMC filters and dyno again to see what difference that makes to my current config, then install the IPD plenum and dyno after that upgrade....

[PKN]

Also dont forget that you lose anbout 15% of power through the drive train on a two wheel drive car so the loss might be more on AWD. You are still way down though. It might be worth driving around for a few days with PSM turned off to get the ECU trained to a richer mixture Make sure AC is turned off and that you are running the highest octane gas you can get before the next run.

This is an interesting topic - maybe we can get a few others to contribute dyno numbers....

PKN