BMW E24M6 M635CSI S38 3.6 Dyno 311RWHP 91 Pump Gas. 363hp crank. 102HP per litre.

Gents,

I managed to fine the last few hp I was after. This is the absolute limit on what standard S38-B36 with cams, exhaust system and solid tune can produce on pump 91 Octane gas.

Previous set up was 305rwhp hot runs/passes. With some "Love" tweaking the system I was able to increase improve the revving characteristics and throttle response and widen the hp and tq curve.

At present set up the pick power is reached at the same rpm as before at 6600rpm but instead of falling at around ~7200rpm now it keeps the ~310rwhp up 7800rpm. Mid range TQ remains the same at pick at ~3800rpm at 253RWTQ.

Torque is as flat as it allows me with the given limitations on std engine. At around 3800rpm the engine is already "in-cam" and as the rpm increases the HP adds to how hard the engine will be pulling towards the new red line of 7800rpm. Previously it bothered me when the engine will fall on its nose because power was closing at 7200rpm and pass that rpm's it will not pull any more because the tq and hp were falling.

The lower rpms from idle up to 3800rpm is also improved with having hi performance cams. Intake resonance flap is working from 1800rpm up to 3800rpm. The Flap is also tuned with % in relation to the throttle position during part throttle under cruise.(too long to explain why)

I over achieved my expectations with the given limitations on std S38-B36. SAE at the crank is 361hp. 369hp DIN.

I will try to make some pulls shortly against std E34M5 3.6.

Regards,
Anri