raddavey wrote:Damo what clutch are you using?
AFR's look ok to me! Just a bit rich up top. (<11.5:1)
The
clutch is (I can hear E cringing already
) a 4 puk brass button plate that I have had for ever. I probably would go organic now, but back then there wasn't anything that I could find which was decent.
You can see the power trace drop as the AFR dips below 12, so I'll have a little play around and lean beyond 5thou out a fraction. I will have to get a print-out of the torque curve and boost trace.
A night or so before I had it dyno'd, I was checking out my valve timing and found that I screwd up and had the valve timing retarded 1 tooth (18deg). I can hear what your thinking, how the hell didn't I notice! The truth of the matter is, that since the first time the engine ran with the bigger cam it has been out of whack, so I had nothing to compare to. I just figured thats how it was, massive lack of bottom end, with a big rush top side. Now with the correct timing, the is a heap more go down low, but the trade off is smaller top end. Seeing the dyno graph, I might also play around with the vavle timing to see wether I can get power out till at least 6k.
To the guys who are making power to and beyond 6k are you still running the stock exhaust/inlet manifold? Proper headwork?
There seems more to my lack of power past 5k than the setup implys.
What sort of ignition timing are you guys getting away with at 16psi?
Out of interest, I don't think making 230kw is too way out there. Take my dyno sheet for example. Power is a function of torque multiplied by revs, so at 175kw this is making near on 330Nm of torque, if I were able to make that same torque at 6k, the power figure would be 205kw. Extend that 330Nm to 7k, and that power figure would be 241kw. Obviously there are power losses, and these power losses are proportional to the speed. I budget on around 15kw loss through the box + tyres at 5k, so at 7k the loss would be more like 21kw ect ect. Factor this in, and the figures are:
355Nm
205kw @ 6k
239kw @ 7k
256kw @ 7.5k
Someone help me make power to 7.5k
Damo
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and good going with the power, i'm sure with a bit more tinkering with the ignition you'll raise that figure nicely!
