Looking to take R4 on a track day at brands, according to website they test litre bikes at 5,500rpm but if that same engine is in a car it's tested at 3/4 max (10,000rpm) this doesn't seem fair, but can anyone clarify?

Is there a driveby limit too?

James

Not positive about Brands but thats usualy the case at track days.

adrian

I was at brands on Tuesday at the kit car live show, MK's supercharged S2000 got pulled off the track for driveby noise, I think it was 92db limit, although the static test was 105db and it passed that without problem.

On tuesday 5th oct at brands they tested my R1 Westfield at 5500rpm and he was well aware it was bike engined. Noise limit on the day static was 105db.

I took my R1 Indy there and they did a static test at 6K rpm. Mine got through at 100DB (102DB was the limit as it was an evening session). I didn't get pulled off (ooh err) and no-one mentioned a driveby limit.

HTH

Just measured at 115Db @ 10,000 rpm... Some work to do!

ok with my baffles in, I pass the test at anything below 8000rpm - so really depends if they test like a bike or a car. GraigR / Blueskate do you have any contacts that might confirm this? (over the phone they said they don't do that)

I was at brands earlier this year and static test of 105db and had to rev to 9500rpm I passed at 103db and had no problems with drive by.

Where did they get the max rpm from?

James

not sure how they do it at track days but when we were racing bikes they worked out the revs for the static test with some bore and stroke calculation......woulda thought with the BECS it would only be fair to do the same.

[Edited on 27/1/11 by wobblyone]