Supercharging the 2.7 - Opinions - 986 Forum - The Community for Porsche Boxster & Cayman Owners

der Geist · 11-05-2007, 03:19 AM

The ratio is calculated by the following formula:

, where

s = piston stroke length

V_c = volume of the combustion chamber (including head gasket). This is the minimum volume of the space into which the fuel and air is compressed, prior to ignition. Because of the complex shape of this space, it usually is measured directly rather than calculated.

Ahh...I just couldn't resist that.

Yes, Blinkwatt-you are correct. Higher compression-more HP. Here is the Wikipedia link for anyone who is just dying to know all about compression ratios....

http://en.wikipedia.org/wiki/Compression_ratio

aussieboxy · 11-07-2007, 10:33 PM

Thanks DR,

I wasn't sure if they were the same kits or not.

Gary in BR · 11-08-2007, 06:44 AM

From my understanding Imagine Auto modifies the 2.5 kit for the 2.7, I believe the car has to go to their shop and they custom tune the kit.

Ask for Jeremy and tell him Gary sent you.

Gary

rule1 · 11-08-2007, 09:52 AM

Actually it is the 3.2 kit and they said it take a couple of weeks to tune it.

porsche986spyder · 11-08-2007, 10:55 AM

Any one know the cost? What about the turboworks turbo? Would that be better power wise?

Adam · 11-08-2007, 03:09 PM

I don't believe turbowerx makes a kit for the 2.7L yet. But after seeing Gary's dyno results I would never supercharge the boxster engine. The gains pale in comparison to the twin turbo setup.

der Geist · 11-08-2007, 04:46 PM

Quote:

Originally Posted by Adam

I don't believe turbowerx makes a kit for the 2.7L yet. But after seeing Gary's dyno results I would never supercharge the boxster engine. The gains pale in comparison to the twin turbo setup.

Adam- What were the differences? I didn't see the dyno. Doesn't Gary have the twin turbo? According to Turbowerks they went from a twin to a single turbo setup for the 2.7 liter. He told me they are doing their initial installs on the 2.7 this month. I spoke to him via email and was going to have it done but the logistics of getting it to Austin along with a vacation conflict were a little too much. I had second thoughts as well as I was told this kit would be out "next month" on more than one occasion last year. Also, he told me that the ECU would need extensive reprogramming and I am kind of iffy about that. I am sure the kit is fine but I don't think I want to be the first one to put a turbo on a 11.3:1 compression engine. I would feel a lot safer if the compression was lowered. Maybe that's why the dyno is the way it is. I don't think you can load a lot of boost with that much compression. $ for $ I think a 3.4 swap would have been better. I know turbo technology has moved forward wuite a bit but Turbowerks claim that of the single turbo performing as good or better than the twin didn't make a whole lot of sense to me.