Originally Posted by
craypot
I used to run around 2.98FDR unboosted 21.5 to try and keep up with the boosted 21.5s. I couldnt keep up out of corners but just managed similar top speeds on a reasonably open outdoor track.
We're about to run a 6hr enduro using 21.5 and blinky mode. I was thinking of an FDR of about 4 - 4.5 to keep temps down.
Thanks buddy, was guessing it's be around the 3.0 mark. What sort of temps were you seeing at the 2.98 FDR were they sky high? I take it that at 2.98FDR you were lacking corner punch I guess a 4.0 - 4.5 FDR will give you that extra 'technical' speed, having been racing against 13.5 Boosted with a 21.5 I have found that (Boosted massively) at 6.0 FDR I lose places toward the end of the straight but am able to more than make up the losses in the technical parts due to the increased controlabilty of the 21.5T, being able to take tighter, smoother more planned lines. This is my point in the experimentation here geared right you said that unboosted you could keep up on the straight at 2.98FDR so this seems to support my assetion that using the grunt of the motor may indeed work, running down to 4.0 would obviously gain back that infield punch but allowing a small amount of timing on top of the inbuilt power (hopefully) will be a happy medium. This is the idea behind a start RPM of 10-12000 RPM as the motor wil be at (almost) maximum RPM .
Here is the setings I intend to begin this experiment with:-
FDR 4.0
Boost Start RPM 11000
Boost 15
Turbo 24
Slope 24
Delay 0.0
ACC 200
Boost will kick in at 11000
Add 3000 RPM from Boost
The Turbo then kicks in at 14,000 RPM.
Currently am starting at 4000 RPM using 250ACC, for the first 3 minutes or so is no slower than anybody else (Graupner included) but after 3 minutes as the heat shoots up the car slows somewhat and then becomes very 'bogged down'.
FDR 6.1
Boost start 4000
Boost 40
Turbo 24
Slope 24
Delay 0.0
Acc 250
Temps mid 80's C
Boost start 4000 Boost phase additional 10,000 RPM so Turbo again kicks in at 14,000 RPM.
Any comments please???