jumper5836

They did a calibration run to figure the drive train loss and 1 run. The run took probably less then 30 seconds and hour to prep the car and get it on the dyno.

This is the only graph we got and it doesn't map the wheel tq

Zookie

There were 2 Runs... First to Calculate the Drivetrain Lose and 2nd was Pedal To the Metal

Our 996 4S's had about 50 +/- CHP Drivetrain Loss

washington dc porsche

Next time schedule this event around Caribana so I can have an excuse to leave the country..

Tbred911

so which mod do you think is the culprit...? your torque curve looks nice... could it be the x51 headers... those are designed to work with different camshafts etc... 200 cell cats add power... and I can't see it being the IPD Plenum; on the other hand the GIAC flash doesn't do much for a 3.6 as it would for a 3.4.. but your torque curve is broad even in the upper rpm band which is what you want... hp don't mean much... it's the area under the curve

you'll get more power with 94 octane because timing will advance... there is your 10hp right there... maybe more... I ran 100 octane at mosport one track day and it made a difference

Tbred911

+1 what is interesting about the torque curve is that it's as high at 6300 as it is at roughly 4000 rpm... stock 3.6 torque curve don't look like that at all... Greg your car is fast @ mosport ... you got a nice flat like curve

Zookie

Here are the Pix from the Day http://www.pcarpower.com/forums/show...sted=1#post493

Here is the Orginal Thread for the Dyno Day, some Numbers and Pictures are posted in here https://rennlist.com/forums/rennlist...y-whos-in.html

Here is my Graph

jumper5836

I've updated my first post as well as add it here with the wheel torque.

jumper5836

I was thinking the free flow exhaust and lack of back pressure.

What is our max octane that are cars are able to use?

washington dc porsche

Wow your tq is suffering. It actually drops before intersecting with HP.

Tbred911

I think your free flow exhaust is giving you some good torque higher up... I also have looked at the numbers from all cars here... something is wrong... your car is 320HP stock at the crank... and the graph only shows 300 hp...

well broken in cars generate more hp than new so I don't think these dyno runs are accurate at all... or require more explanation... what was your engine temperature when the dyno was performed... was the needle point 90 degrees strait up? (that is where you want it for a dyno run)... also if your car was cold your tranny fluid was cold and that could eat up 20hp in the dyno... lots of variables...

the ECU is smart enough with a GIAC flash to advance timing and take advantage of 100 octane; even 94 octane advances timing noticeably

Tbred911

but then it rises again! which a normal 3.6 doesn't do... probably due to the high flow cats and free flow exhaust which gives him top end... trust me his car is fast @ mosport... something about this dyno is definitely off when no 996 made more than 300 crank horsepower here... hmm

Zookie

Intresting... im sure the Trans Fluid dint have enought time to Heat up and neither did the Oil, We were the last ones to go...

Think about it Greg the 997 C2S sat all day untill Dyno Run but the 997 C2 just came in and was on the Dyno in like 45 mins...

jumper5836

Something to consider. Are cars where 4 hours cold by the time they were put on the dyno. My diff and trans fluid has never been done, Could explain the dif of 4 hp in drive train loss from yours.

Tbred911

that makes a difference... also what weight of oil used as well... in any case testing under normal operatig temps will give you a more accurate pic of hp.

Zookie

To be honest even tho this Dyno is State of the Art only thing that really counts is the Actual Power the car produces on the Highway at High Speeds. For example my buddies Built N/A E46 M3 puts down 298 WHP on the Dyno, i ran him last friday night 80kmph to 240kmph+ and i had him by 2 cars. So mine being 250 WHP and his being 50hp more and i still beating him... Its Weird, and he is a very very good driver.