The end of the road of this very long project is in sight. I took the car to Snetterton on Wednesday for a £100 BMW Car Club trackday. The noise level was higher than I expected, measuring 105dB at 4800 on the tacho (more on this later)
As I had never driven the car, nor been to Snetterton before, and the track was very slippery in the morning, I took it very easy to start with, and was not worried by an apparent misfire at 5000, there seemed to be be plenty of power, so I was looking forward to a dry track in the afternoon.
The afternoon was dry and bright and the track had dried out over lunch, so I began to work out the misfire, lifting off the throttle to try and drive through it didn't work, so it didn't seem to be a fuel problem and had be be timing related. A quick call to Nick Fulljames didn't reveal a solution, after all it had been revving to 8000 rpm on the dyno before setting the limit at 7500 in the Omex software. Even so it was more than keeping up with the other cars on track, out accelerating M3s, M5s and TVRs, so it certainly was not lacking in grunt.
Had they checked my tacho? On the rolling road they would have been looking at the laptop or the RR screen, so I guess they forgot to change the tacho "gearing" in the software. So the noise test was carried out at over 7000 rpm!
The rest of the day proved how quick the car is, if not me, being quicker than everything else I came across apart from a 997 GT3RS. The suspension set up is -2° front camber and -1° rear, 205/50 Toyo 888s on 7 x 15 front, and 235/50 on 9 x 15 rear. Turn in is very good, but understeer in the slow corners with power on is surely due the very tight LSD, so I need to tailor my style to suit.
I am a happy man. The car is going back to Nick to sort out the low speed drive-ability, which is pretty good despite RSR cams, and set the tacho correctly
Once back with me it's off to Silverstone for another BMW day on November 23rd. If anyone is passing by and wants to try the car out, please give me a call.
I put the car on corner weight scales yesterday; 1087Kg with 30L of fuel on boad, say 1065Kg without fuel. I am happy with that result as I didn't build the car down to weight, it has steel doors, front wings, bonnet, full trim and sound proofing. 300bhp per tonne is satisfactory
