Pavlo

Following on from the 553hp thread, I just thought I would details the reason behind the impressive power output.

I was testing some 118 Klotz racefuel as supplied by RJ Tuning, (Richie200).

The basic spec is fully built EJ25 with rods, pistons, ported heads reprofiled medium duration cams, and a small GT30 turbo (52lb/min max flow),

The summary of results are as follows (wheel hp is uncorrected, so these are raw wheel figures).

1. Fuel: - Optimax
Ign ADV: - Base map
Boost PX: - 1.7BAR
AFR: - 12:1
EGT: - 900
BHP @ W: - 376
BHP @ Fly: - 501
TQ: - 489lbft


2. Fuel: - Klotz 118
Ign ADV: - +6
Boost Px: - 1.7BAR
AFR: - 12.6:1
EGT: - 890
BHP @ W: - 414.5
BHP @ Fly: - 553
TQ: - 528.4lbft

At peak torque I was managing an extra 9 degrees of timing. My view is also the optimax map was too advanced, det detection from the RR operators det cans could have been a little better in my opinion. So the difference over the plain optimax could be as much as 15%.

Worthwhile noting the EGT was about the same despite leaner AFR on the Race fuel.

Paul

Andy.F

Did you have to map it to give the leaner AFR Paul ? Or was that a result of the race fuel having a different density.
Also wondering if this is a leaded fuel ? Thinking here about its effects on lambda sensors ?
Would have been interesting to do a back to back with 'scottimax'

Can you expand on the "wheel hp is uncorrected" ? Does that mean the wheel hp would have been even lower if corrected for the freezing conditions this weekend ? That seems a bit odd as the losses are already extremely high

Andy

Pavlo

The correction factor seems unreasonably high. It did actually get quite warm at AE with the poor ventilation, despite the cool weather outside (nowhere near freezing actually). Airpressure was low (according to their barometer), but I suspect that in reality the absolute figures could be out. They do however agree with the PTS rolling road figures up 5200rpm quite well so who knows?

The leaner AFR was deliberate, I started with the optimax map, removed a theoritcal 0.5 AFR point worth of fuel and that's what it ran, and tweaked a little from there. I brought the boost up over the course of about 4 runs with race fuel, making small changes along the way.

As it happens I did bring a few litres of methanol with me, and had intended to try that too, but ran out of time, another time though.

Paul