Dyno Report : GIAC DME Stage 3 Program on Boxster S

[Adam]

I agree with you on the the headers Clubhead. I've looked at mine up close and are definately not optimized for performance.

[andicati]

I think that Clubhead has really done us all a massive favor. His data shows what pretty much every respectable tuner is telling us is true. The exhaust systems of modern cars are a significant compromise of performance vs emissions and sound.

A US spec Porsche has to comply with a wide range of State emissions regulations. It is no surprise that the manufacturers choose to sell only one model that meets even the most stringent (CA) spec in order to optimize costs. Smaller manufacturers like Porsche often even compromise Euro spec cars to conform to the most stringent (lowest common denominator) requirements.

I remember visiting the Ducati factory in Bologna a few years back and commenting to the CFO on the multitude of different spec same model bikes awaiting shipment and he replied that in a few years time they will have converged all models to one spec, to the detriment mostly of the Europeans.

Porsche are engineered to a much higher level than the average rice burner or detroit stump puller. However, their intake and exhaust sytems have to be sub optimum from a performance perspective. Also, lets not forget that we are dealing with a $40- $50k Porsche...they had to shave costs somewhere!

The interesting thing about Clubhead's data is the fact that the intake and ECU mods yielded little gain which helps the rst of us focus on the exhaust side until someone can prove that the intake boost can be had for a reasonable cost. Thanks Clubhead!

[clubhead]

Originally Posted by andicati

....The interesting thing about Clubhead's data is the fact that the intake and ECU mods yielded little gain which helps the rst of us focus on the exhaust side until someone can prove that the intake boost can be had for a reasonable cost. Thanks Clubhead!

You're welcome At least I'm getting constructive comments here.

I could've easily just posted my positive dyno results on my headers and sports cat and left out the bad results on the intake, muffler and ECU to save myself looking like an idiot who just wasted a bunch of dollars. Afterall, this place is for sharing our experiences. But there're just people that're itching to say "I told you so" once they read about the negative experiences. Just look at the response I got off the UK Boxster board and you'll know what I mean... I'm not posting dyno results (positive or negative) over there anymore.

After going through all this, did anyone notice the European tuners (Gemballa, RUF, etc) mostly leave the stock intake piping in place and just make do with an aftermarket filter element? I think they've gone down the route of the Evo type intake with less than positive results.

So I'm going to source for a BMC filter element and replace the Evo intake kit with the stock piping kit. A dyno and report will then follow

The local dyno shop just loves me....

[Adam]

I think that is a good idea on the BMC. I love mine and it only costs 70 bucks. I really do think the intake system is about as good as it is ever going to get with the BMC filter. Unlike the EVO system, the stock system sucks only sucks in fresh cold air from outside the engine bay.