Horsesoldiers
New member
Curious if any 997 owners have ever taking your cars for a power run on the dyno? If so how did the figures compare to manufacturers quoted numbers?
Dyno Figures
- Thread starter Horsesoldiers
- Start date
I have a 981 Cayman which had a tuned 3.8L Carrera engine fitted in Germany.
On my way back from Germany I stopped off at Regal Motorsports in Southampton to check the power and torque, not because I doubted the tuner's numbers on their €5m Maha dyno but because I had run the car previously on Regal's Mustang dyno when it still had the 3.4L engine. The 3.4L runs showed close to OEM quoted power, so I felt some confidence on my return visit.
You need to run the car up in the nearest gear ratio to 1 (i.e. minimal gearing effect) and take it to the limiter - easier/safer with PDK.
What part of the country are you based?
On my way back from Germany I stopped off at Regal Motorsports in Southampton to check the power and torque, not because I doubted the tuner's numbers on their €5m Maha dyno but because I had run the car previously on Regal's Mustang dyno when it still had the 3.4L engine. The 3.4L runs showed close to OEM quoted power, so I felt some confidence on my return visit.
You need to run the car up in the nearest gear ratio to 1 (i.e. minimal gearing effect) and take it to the limiter - easier/safer with PDK.
What part of the country are you based?
You might call https://rpmtechnik.co.uk/
to see if they have recommendations.
I see that a R10 has a visit to them planned April 28.
to see if they have recommendations.
I see that a R10 has a visit to them planned April 28.
Hi horsesoldiers, I've had some low results from Dyno testing Last year on a 996.2 C4S and this year on. 997.2 C4gts.
DynoDynamics 4wd road.
996 runs pre and post exhaust and intake mods. Stock car should deliver 320 Bhp, first run recorded only 270bhp. Tester put this down to intake air temperature at 70+ degrees C. We couldn't reduce this temp no mater how much air flow we could get from front to back. The car had previously been fitted with a K&N filter kit and High flow cats . I think the combination of reduced back pressure and high intake air temp was the main issue. K&N arrangement pulls air from engine bay.
Testing posts mods DesignTec valvetronic exhaust system, 200 cells cats, hi flow headers, IPD plenum and an 82mm throttle body producoed around 24 Bhp improvement, better mid range torque around +20 lbs ft.
Again air intake temp was high and I think attributed to stationary car and the K&N filter.
On the road with Durametric logging the intake temps were down to ambient plus 10 degree max
Pretty sure a remap following mods would have improved further.
Project abandoned and reverted to "stock" to make way for GtS.
997.2 C4GTS, stock run on same Dyno Dynamics 4wd produced only 330 Bhp with both torque and power curves almost like sine waves!
Tester diagnosed this as 997.2's awd system producing differential front wheel speeds and the traction control activating and reducing power. The Dyno was not suitable for the computer controlled 997 system.
2nd run was on a newer dynodynamics road that is reputed to be suitable.
Prior to this run I had completed the Milltek cross pipe/exhaust centre box delete.
Dyno results 360 Bhp still missing around 40 horses. (Stock is 402bhp/408hp)
Dealer lever analiser shows missfires at high revs under load on cylinder 4&6 with retardation activated. Although no fault codes are thrown up or stored subsequent Durametric logging under hard driving shows similar intermittent missfire. Suspect plug or coils issues, the mufflers need to be dismounted for access so it will be next week before I can change out the plugs and coils.
I'll update when results are available.
Meantime...Any suggestions/experience running upgraded/high performance plugs and coils most appreciated.
Awrabest
Gordon
Update on 997.2 c4gts
coils and plugs renewed, misfires no longer present, some retardation still present at full throttle, average of 1 degrees on all cylinders, so negligible effect on power
Stock dyno run still low on power 365hp most likely due traction control limiting engine out put due differential wheel speeds front v rear.
Tested Clive's 4WD switch to RWD handbrake function while on the road with the front rollers set to freewheeling. Handbrake on one notch, select drive in auto mode. Front and rear wheels start turning, accelerate slowly. Front wheels stop turning and rears accelerate. Release handbrake and front wheels resume driving. So Clive's Magic is confirmed!! Thanks Clive.
Unfortunately we were not able to use this feature to improve Dyno/Traction control effects as PSM fault codes were introduced which prohibited manual PDK gear selection and the car went through the gears up and down without reaching max throttle. Believe this due to front wheels not turning with the front rollers in freewheel mode. Time running out RWD only tests abandoned.
Reset everything and cleared all fault codes.
Repeating Stock run in 4WD sets baseline at 357hp@ 7100rpm with torque graph almost linear 200lbs ft @1500 rpm thro 240 @ 2400rpm to max 312lbs ft @4800rpm,
Upload EVOMSit fast road map and after adaptation runs max power measured at 382hp @ 7650rpm and torque builds quickly from 180 @ 1500rpm to 270 lbs ft @ 2400 and is almost constant through mid range to max 295 @ 5200rpm, maintained to 6200rpm where it drops slowly
So ...while still "missing" around 40hp due the Dyno mismatch with the 4WD/traction control, I'm delighted with the gains, +25hp across the rev range and the extra 30lbs ft of torque available from 2400 rpm.
Drive home in rush hour traffic was both frustrating and exilerating .....when a gap appeared!
I'll post the graphs when I have them in PDF format.
Awrabest
Gordon.
DynoDynamics 4wd road.
996 runs pre and post exhaust and intake mods. Stock car should deliver 320 Bhp, first run recorded only 270bhp. Tester put this down to intake air temperature at 70+ degrees C. We couldn't reduce this temp no mater how much air flow we could get from front to back. The car had previously been fitted with a K&N filter kit and High flow cats . I think the combination of reduced back pressure and high intake air temp was the main issue. K&N arrangement pulls air from engine bay.
Testing posts mods DesignTec valvetronic exhaust system, 200 cells cats, hi flow headers, IPD plenum and an 82mm throttle body producoed around 24 Bhp improvement, better mid range torque around +20 lbs ft.
Again air intake temp was high and I think attributed to stationary car and the K&N filter.
On the road with Durametric logging the intake temps were down to ambient plus 10 degree max
Pretty sure a remap following mods would have improved further.
Project abandoned and reverted to "stock" to make way for GtS.
997.2 C4GTS, stock run on same Dyno Dynamics 4wd produced only 330 Bhp with both torque and power curves almost like sine waves!
Tester diagnosed this as 997.2's awd system producing differential front wheel speeds and the traction control activating and reducing power. The Dyno was not suitable for the computer controlled 997 system.
2nd run was on a newer dynodynamics road that is reputed to be suitable.
Prior to this run I had completed the Milltek cross pipe/exhaust centre box delete.
Dyno results 360 Bhp still missing around 40 horses. (Stock is 402bhp/408hp)
Dealer lever analiser shows missfires at high revs under load on cylinder 4&6 with retardation activated. Although no fault codes are thrown up or stored subsequent Durametric logging under hard driving shows similar intermittent missfire. Suspect plug or coils issues, the mufflers need to be dismounted for access so it will be next week before I can change out the plugs and coils.
I'll update when results are available.
Meantime...Any suggestions/experience running upgraded/high performance plugs and coils most appreciated.
Awrabest
Gordon
Update on 997.2 c4gts
coils and plugs renewed, misfires no longer present, some retardation still present at full throttle, average of 1 degrees on all cylinders, so negligible effect on power
Stock dyno run still low on power 365hp most likely due traction control limiting engine out put due differential wheel speeds front v rear.
Tested Clive's 4WD switch to RWD handbrake function while on the road with the front rollers set to freewheeling. Handbrake on one notch, select drive in auto mode. Front and rear wheels start turning, accelerate slowly. Front wheels stop turning and rears accelerate. Release handbrake and front wheels resume driving. So Clive's Magic is confirmed!! Thanks Clive.
Unfortunately we were not able to use this feature to improve Dyno/Traction control effects as PSM fault codes were introduced which prohibited manual PDK gear selection and the car went through the gears up and down without reaching max throttle. Believe this due to front wheels not turning with the front rollers in freewheel mode. Time running out RWD only tests abandoned.
Reset everything and cleared all fault codes.
Repeating Stock run in 4WD sets baseline at 357hp@ 7100rpm with torque graph almost linear 200lbs ft @1500 rpm thro 240 @ 2400rpm to max 312lbs ft @4800rpm,
Upload EVOMSit fast road map and after adaptation runs max power measured at 382hp @ 7650rpm and torque builds quickly from 180 @ 1500rpm to 270 lbs ft @ 2400 and is almost constant through mid range to max 295 @ 5200rpm, maintained to 6200rpm where it drops slowly
So ...while still "missing" around 40hp due the Dyno mismatch with the 4WD/traction control, I'm delighted with the gains, +25hp across the rev range and the extra 30lbs ft of torque available from 2400 rpm.
Drive home in rush hour traffic was both frustrating and exilerating .....when a gap appeared!
I'll post the graphs when I have them in PDF format.
Awrabest
Gordon.
Gordon,
The car's ECU should be set to Dyno Mode for the runs, this will avoid any of the system nannies confusing the results.
The car's ECU should be set to Dyno Mode for the runs, this will avoid any of the system nannies confusing the results.
Horsesoldiers
New member
Thanks for the post on this....I actually took my car to Surrey Rolling Road a few weeks back for a power run, see below.
338 BHP at the flywheel.
285 lb ft.
Fuelling all spot on.
My previous car, a modified RS4 B5 was dyno'd at 408 with the above and 424 at MRC in Banbury so clearly a calibration issue. My 2005 C2S is standard but feels and pulls like it has 370BHP[
]..not sure what to conclude.
338 BHP at the flywheel.
285 lb ft.
Fuelling all spot on.
My previous car, a modified RS4 B5 was dyno'd at 408 with the above and 424 at MRC in Banbury so clearly a calibration issue. My 2005 C2S is standard but feels and pulls like it has 370BHP[
]..not sure what to conclude.
Horsesoldiers said:Thanks for the post on this....I actually took my car to Surrey Rolling Road a few weeks back for a power run, see below.
338 BHP at the flywheel.
285 lb ft.
Fuelling all spot on.
My previous car, a modified RS4 B5 was dyno'd at 408 with the above and 424 at MRC in Banbury so clearly a calibration issue. My 2005 C2S is standard but feels and pulls like it has 370BHP[
If I have this correctly, your 997.1S dyno run showed 338 crank hp versus stock 370hp and the question is what happened to the 32hp?
It is either the dyno (but SRR seem to do lots of Porsche power runs so discount that) or the car. This might be any number of things ranging to condition of plugs, fuel pressure, etc which I guess you just have to work through, unless someone else has a prioritised list.
Hi Ralph, thanks for the tip. I've searched a few times but haven't been able to find any info on "Dyno mode" for these cars. Even asked Durametric if it was possible, tech said he couldn't help.
Would love to know how you put the ecu into Dyno mode?
i've just read on here that "one notch on the handbrake" switches from 4wd to 2wd mode. Hope to try this asap. Have you any experience of this?
Awrabest
Gordon
Would love to know how you put the ecu into Dyno mode?
i've just read on here that "one notch on the handbrake" switches from 4wd to 2wd mode. Hope to try this asap. Have you any experience of this?
Awrabest
Gordon
Horsesoldiers
New member
Stock for a gen 1 is 350 bhp. You are correct Charlie at SRR does a lot of 996 and 997s and says they are often 10%below stock. So inaccurate dyno or 15 years plus wear and tear drops the bhp figure.
Gordon Park said:
The hand brake sounds like witchcraft and just as believable.
Your man will no doubt use AutoLogic or PIWIS diagnostic where in one of the menus you can put the ecu into dyno mode. I can’t direct him to where it is but it is there.
Hi again Ralph, I'll ask the Dyno man. fingers crossed.
Have read somewhere that the PIWIS Dyno mode is only for available for 991/981 RWD cars.
The witchcraft handbreak notch is posted in FQA by one of our very own site moderators!! so thought it would be worth a try.... if works it's certainly magic...*s*
awrabest
g
Have read somewhere that the PIWIS Dyno mode is only for available for 991/981 RWD cars.
The witchcraft handbreak notch is posted in FQA by one of our very own site moderators!! so thought it would be worth a try.... if works it's certainly magic...*s*
awrabest
g
You could ask 9excellence as they tune 996 and 997 turbos 4WD. Not sure they have a dyno though as maybe their performance stats are determined by another method which I do not understand
Lancerlot said:[FONT=arial"]"There are more things in heaven and earth, Horatio (Ralph) Than are dreamt of in your philosophy."
Regards,
Clive
Wizard?
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