[Kunz]

Hi there



I thought I might post here some data comparing the performance of my / our car in different setups.

To be said first at this point again: GTech datas are no Nm nor hp really. The GTech messures G's vs rpm and therefor calculates the NETTO performance / power pushing the car foreward (this by the way is done very accurate as far as the runs are under the same conditions). So you could say it is about performance at the crankc minus loss in box / tyres minus air resistance minus every other resistance working against acceleration. Whatever, what really matters is the difference before / after - relative level of numbers - and not the absolute level of the numbers...



The black run is stock header / cat plus Cargraphic catback, car running on normal fuel (Superplus / oktan 98 here in Europe), my intake



The green run is RSbarn header / my 100-cell-cat plus Cargraphic catback on normal fuel, my intake



The red run is RSbarn header / my 100-cell-cat plus Cargraphic catback running on E85, tuned with an APEXi neo on 48lbs/h injectors, my intake



It can easily seen that the exhaust and header make quite a big difference through out the revs but mainly at low and mid revs. Tuning the car on E85 with the same setup gives again serious (for a car like the 968 that is really hard to get more out of) gains trough out the revs but now mainly at mid and high revs.



I hope to ba able to instal the RSbarn header and my 100-cell-cat on monday again, so I can compare the Cargraphic vs my homemade exhaust...

Posts will follow...



Best regards, Kunz

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[Sho968]

Thanks for posting this.



I am too looking for more power now, and quantitative data such as this really helps.

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[Cloud9...68]

Wow, I'm amazed what a difference E85 makes. This indicates our cars are detonation-limited, and really do benefit from higher octane fuel. There's been a lot of speculatuion on this point, and I must say, I was skeptical that the benefits some were claiming about the use of very high octane fuel were real. Nothing like data to settle the matter. Very interesting.

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