ORIGINAL: Adam2S
Info : Engine upgrade to 300 kW (408 bhp). Comprises modified cylinder heads, carbon-fibre air filter casing (upper part), new double resonance intake manifold, sports exhaust system featuring specially designed twin dual-tube tailpipes and modified engine management. Note: also available in conjunction with PDK
Price : £8066.00
About the same as a Gen 1 997 GT3 or my beast then [
]
Allan's link looks interesting at a claimed 423bhp.
General warning though - these claims are for changes made 1) in a comparable environment to Porsche testing the engines and 2) are often based on theoretical gains not actual benchmarked numbers.
What does that mean in English -
1) the figures would be obtained only if the engine was removed from the car and put on a dyno - no air intake or airflow restrictions, no losses with extra bits attached like drive shafts etc and no issues with heat from being enclosed in the engine bay and proximity of other components. So put your car on a rolling road and the stock Porsche engine will give around 6-12% less than the quoted figures, the same will apply for your upgrades (the rolling road guys use a mathematical calculation you get you back to like for like figures). True this is the same for all cars so its the relative improvement that matters but see 2) below.
2) A lot of these gains are calculated by a computer model and not measured - so the actual gain on a dyno (not perfect conditions) would be less and when attached din situ tot eh road car a lot less.
So when comparing upgrades you've got you finds out which ones are measured increases and which are theoretical. And of the measured increases which ones are in situ and which are on a dyno. No surprise the claims drop significantly from Computer simulated to in Situ -so its not easy to do a like for like comparison.
So for example the changes on mine should have yielded (theoretically) 40 -50bhp+ (ie around about 430+bhp)[
], in dyno it would have been about 30 maybe 35bhp (420bhp max)[
]. In situ in the car, on a rolling road its around 22 -24bhp[
]. Having said that we tuned mine for in gear performance and overall drive-ability not peak power so we could have had more out of it.
So in choosing it against another option you can see how different the figures could look for much the same performance.[:'(]
Also, its the torque and power curve that matter much more than peak power - so you might get a higher BHP figure but get blown away on the road by a standard car because you only get the extra at the very top end, in a straight line race and loose on in gear times.[
]
