Dyno Chart on M400

[Doug Axelrod]

I thought I'd sidestep the "disappointing M400" thread, as my kettle is fine, thank you very much.

But I would be interested in seeing dyno curves on stock and near-stock M400s, not for exact numbers (as I know dynos vary), but for the shape of the curve. As soon as my engine completes break-in, I'd like to have more data on where to shift, etc.

Thanks,
Doug in Cincinnati (just over the pond in flyover land)

[joust]

Doug,

If all else fails then Dyno Dynamics will be at the Noble Owners Club first trackday, so we should get some like for like plots there.

www.pistonheads.com/gassing/topic.asp?p=2&f=26&t=223755&h=0

Fancy flying over?

J

[alex s]

Doug, on the owners day there is going to be a RR so I guess a few will be done then. I will be surprised if they make the quoted power, as usually that power is achieved in idea conditions. Looking forward to it.

[alex s]

opps, justin beat me to it!!

[Doug Axelrod]

Thanks, gents.

I won't be there for this round, but now that I know about all you trackday Brits, I'll look you up on my next visit.

Meantime, I'll be grateful to see the M400 charts.

Again, I don't care about the absolutes as much as the shape of the curves. (a wink is as good as a nudge...)

cheers,
Doug in Cincinnati

[BCA]

Do a search, someone has had thiers on the RR about a month ago here, and it came out bang on the money. Cant remember a chart though mind...

[monitor]

Doug... here is one item from Simon on shift point.

BCA,

When I said that the drivetrain is given a hard time, I didn't mean to the extent that you lunch the gearbox in the process.

In a 3R, 3400rpm and a smartish let-up of the clutch suffices. In the M400, because of it's softer, grippier rubber and optimum torque produced higher in the rev-range, you need to use around 4200rpm.

Side-stepping clutches is a sure-fire way of breaking something, and is slower anyway.

Since the M400 produces max power at 6500rpm, it's pointless running to the 7300 limiter, because your acceleration will suffer: 7200 in first and second, then 7000 in third and fourth is best.

If you get it right, the drivetrain and clutch should not get too much of a pounding. What tends to get abuse are the gear selectors if you're chasing a really quick time...

S