Please note the 11 minutes cool down prior to the third run.

 

 

 

 

 

 

This is a nifty little device. It plugs into the ODBC II port and can record up to 300 hrs. of data.
The data sampling are in 5 second intervals so the resolution is not good enough for your drag strip runs or a dyno run but it can provide interesting long term data while you're driving around.
The device is also capable of reading diag. codes if your CEL comes on and supposedly able to reset it. I never tried the reset CEL function because this light has not come on yet in my 996.
My only gripe is that the software does not have a export function for it's graphs so I'm going have do some screen captures or scanning to display them on this forum.

 

rather than messing around trying to get the CarChip graphs heres a quick summary of the air intake temperature data.

First set of three S/C dyno pulls with the two blowers up front. Air intake temperature range between 100-138 F.

Second set of three S/C dyno pulls with additional blower in the rear. Air intake temperature range between 90-105 F.


--Ken

 

Ken, thank you very much to share all this data with us. 91 Hp gain at the wheels is just amazing.
Having in mind the weigth and power of your car, you have round about the same relation Weight/power of the 996 Turbo. 3.66 for the 996 Turbo, and 3.68 for your car, calculated with a 10% loss on the rear wheels, so at the crank you may have 385Hp. If we made this calculation with a 15% loss, instead of 10% loss at the wheels, your doing 409Hp at the crank making a relation weight/power of 3,46 wihch is absolutely fantastic. So, if this numbers are realistic, you will be able to keep up with your brother´s 996 Turbo

What was the reason for a 14Hp difference on the second and third run with both blowers in front?

Where did you bought the nifty little device? How much does it cost? Can is measure the engine oil temperature? Sorry for so many questions

Those pics with the car on the lift look great

 

actually, the loss at the wheels is more like 17.3% (300 to 249). that turns this into 444 hp

 

So your car was making 8 Hp less than Ken´s pre-SC, and 20 Hp more after-SC. Hummm...this is weird. You gained 118Hp, while Ken gained 91Hp !!!!!

Ben, do you really think that a supercharger gives 144Hp more to a 3.4L engine????????? I don´t think so, even taking in consideration all the other mods you´ve done.

 

Mine is using a different sized pulley which is why I get 20+ (@ the wheels) more HP. Scott's was done the same time mine was and I think he is using the same pulley as pixrken and getting numbers similar to him. YES, I do believe the SC is generating 144 more HP. As a general rule of thumb, SC's add about 50% more power depending on the boost.

BTW, my 3rd gear is about the same as Scott and pixrken @ 352.4 @ the wheels.

FWIW, while developing similar "peak" power, the SC'd 996 doesn't produce nearly as high a % of peak power as early as does the 996TT. This is why the 996TT still keeps up with the SC'd 996 despite carrying an extra nearly 500 lbs. The SC'd 996 is all about smooth power delivery whereas the TT is about LAG and then violent power! With stock exhausts, you'd never ever think you were going as fast as quickly as you do in an SC'd 996 without looking at the speedo (or looking in your rear view at what you just blew away).

 

Hi Ben;

I knew you were running more boost, I didn't know it was because you change out your pulley size. I would have been more than happy to change it out had I known
Oh well, more mods to look forward to

--Ken