Planet 9

Keith@APR · #1 12-10-2007, 12:16 PM

Wanted to start a quick thread to relay some IPD Plenum data we began collecting today.

Here's a baseline of the development Cayman S which has APR full exhaust and APR 93oct Performance calibration:

Here's another pic of the IPD Plenum being installed on the dyno:

I hope to have another dyno of just the gains to be had by bolting the plenum on shortly!

**Santa Fe** · #2 12-10-2007, 12:28 PM

This has been asked before but probably got overlooked, is there any change in emissions with the plenum?

Keith@APR · #3 12-10-2007, 12:51 PM

Originally Posted by Santa Fe

This has been asked before but probably got overlooked, is there any change in emissions with the plenum?

I haven't done any emissions testing as of yet, sorry.

Kor · #4 12-10-2007, 01:57 PM

- That graph has no labels
- Why doesn't APR make their own plenum?

Keith@APR · #5 12-10-2007, 02:46 PM

Originally Posted by Kor

- That graph has no labels
- Why doesn't APR make their own plenum?

What labels do you need?

Kor · #6 12-10-2007, 03:46 PM

Originally Posted by Keith@APR

What labels do you need?

What about my 2nd question??

**4by4** · #7 12-10-2007, 04:13 PM

Whats the crazy blue line?

elmo91789 · #8 12-10-2007, 04:31 PM

Keith, Is this the APR full exhaust with cats and hope this means the IPD plenum specific APR software is on its way ?

APR software specific for the IPD plenum is on my Christmas Wish list.

**K-Man S** · #9 12-10-2007, 04:50 PM

Keith,
Something is wrong with that Cayman if it is making peak HP at 6200 rpm, the peak should be quite a bit higher, after raising my rev limiter my peak is about 7150, but even before that it was always near 6950. This also seems to be true for other Cayman S dyno charts (stock and modified) that I've seen before. This is the lowest reported peak RPM that I've seen, was something done intentionally to make it that way?

**Slatfatf** · #10 12-10-2007, 05:02 PM

Originally Posted by K-Man S

Keith,
Something is wrong with that Cayman if it is making peak HP at 6200 rpm, the peak should be quite a bit higher, after raising my rev limiter my peak is about 7150, but even before that it was always near 6950. This also seems to be true for other Cayman S dyno charts (stock and modified) that I've seen before. This is the lowest reported peak RPM that I've seen, was something done intentionally to make it that way?

It may be an artifact of the severe smoothing that has been applied to the data. All the detailed features that we've seen in so many other CS dyno charts are missing - smoothed out.

**K-Man S** · #11 12-10-2007, 05:47 PM

Originally Posted by Fort Felker

It may be an artifact of the severe smoothing that has been applied to the data. All the detailed features that we've seen in so many other CS dyno charts are missing - smoothed out.

Granted there is smoothing, but the chart makes no sense between 6000 and 7000 rpm, it peaks, goes down and then comes back up again?? Huh? That's some radical smoothing to make a chart look that unbalanced.

Chops · #12 12-10-2007, 07:21 PM

Looks like he let off the throttle

and yeah, what is the blue line?

friedman_japan · #13 12-10-2007, 07:51 PM

Originally Posted by Chops

Looks like he let off the throttle

and yeah, what is the blue line?

One would think it is the torque curve but if so it would be an even more unusual pattern than the horsepower curve...

porsches4ed · #14 12-10-2007, 07:53 PM

Originally Posted by Chops

Looks like he let off the throttle

and yeah, what is the blue line?

its torque, corresponds with the HP, letting off the gas to change gears. Dynapacks really show when you let off the gas, thats pretty good 301HP/261FTLBS. The APR full exhaust added 4HP and 5FTLBS of torque more than the Milltek full exhaust. The dyno B4 was 297HP 256FTLBS with the full milltek.

301HP / 261LBSTQ:

-APR Software
-APR Headers
-APR CatBack Exhaust
-K&N filter
-DeSnork

297HP / 256LBSTQ

-APR Software
-Milltek Headers
-Milltek CatBack Exhaust
-K&N filter
-DeSnork

**Santa Fe** · #15 12-10-2007, 08:24 PM

I'm not familar with that brand of Dyno. Why does torque drop when changing gears and HP does not? And why was the operator changing gears during the run?

porsches4ed · #16 12-10-2007, 09:52 PM

HP doesnt drop but it starts to level out at the same time-Im not a dynapack tech I will let Keith answer those.

**K-Man S** · #17 12-10-2007, 09:55 PM

Originally Posted by Santa Fe

I'm not familar with that brand of Dyno. Why does torque drop when changing gears and HP does not? And why was the operator changing gears during the run?

Seems strange to me too, there's no way torque gets affected by a gear shift and HP does not, RPM's fall both torque and HP will fall. Additionally I concur, usually you spin up to the gear you are going to test in and then run up from there in one single gear to the limiter and record the results. I see what appear to be small drops in HP about the same place so again maybe it is whatever sort of smoothing was applied to this dyno chart. It would be nice to have raw numbers or an unsmoothed chart done in one gear to look at. Let me be clear I am not saying this chart is wrong or something nefarious was done, I'm just saying it doesn't look like what I'm used to from a variety of other dynos and thus it is hard to make sense of...

**josephsdesimone** · #18 12-10-2007, 10:24 PM

Hello Keith,

Recognizing APR Tuning as the supreme software tuners for the Cayman S (all Bosch ECU's), I for one (and a buddy of mine from the west coast) are counting the days until you release the new APR Tuned flash for the IPD plenum! The enhanced performance from your Cayman S flash (for the stock Cayman S) can only leave us wondering how much more power you will find when you engineer for the enhanced flow from the IPD plenum. I would also imagine that every other Cayman S owner that purchased the IPD plenum is equally excited!

Just an observation, I would think that you ran your test Cayman S with the newly installed IPD plenum for enough miles and heat/cool cycles to allow the ECU to fully adapt. I know that it took my ECU and many other Cayman Club posters some time for their ECU to fully adapt.

Thank you,
Joe DeSimone

elmo91789 · #19 12-10-2007, 10:26 PM

Originally Posted by K-Man S

Seems strange to me too, there's no way torque gets affected by a gear shift and HP does not, RPM's fall both torque and HP will fall. Additionally I concur, usually you spin up to the gear you are going to test in and then run up from there in one single gear to the limiter and record the results. I see what appear to be small drops in HP about the same place so again maybe it is whatever sort of smoothing was applied to this dyno chart. It would be nice to have raw numbers or an unsmoothed chart done in one gear to look at. Let me be clear I am not saying this chart is wrong or something nefarious was done, I'm just saying it doesn't look like what I'm used to from a variety of other dynos and thus it is hard to make sense of...

I'm sure Keith is not tring to throw you a curve.The torque curve is fine the reason it is not what you are use to looking at is the increments of torque on the left side of the chart are in 2.5 ft/lbs not the larger increments we look at on most dynos posted here. The vertical rise and fall on this chart are more pronounced because each vertical unit is 2.5ft/lbs of torque. I like this chart it shows where correction in the torque curve is most needed and I expect that APR is going to show us a fix for that.

porsches4ed · #20 12-10-2007, 10:31 PM

Originally Posted by K-Man S

Keith,
Something is wrong with that Cayman if it is making peak HP at 6200 rpm, the peak should be quite a bit higher, after raising my rev limiter my peak is about 7150, but even before that it was always near 6950.

Here are few dynos from other CS seems they all are around 6000-65000RPM