How much is your power drag?

[4535jacks]

My 98 chim 400 was RR'd and made 211bhp at the flywheel but only 168bhp at the wheels. This gives a Power drag of 43bhp, which is about 20% drag. Is this quite high?
What figures are others getting?
What is the main cause of the drag, gearbox or diff?
Would a gearbox or diff rebuild remedy this?
Thanks, Gary

[spend]

Without knowing which RR it was recorded on you can't say for sure if its good or bad, we have an idea of average performances on well known RR's and the deltas between them. Unfortunately its in the right ball park for a 400, so without knowing the particular RR could be good or bad. If you are not happy you may be heading into the muddy waters of tuning, better breathing is key, cam/heads/inlet mods make the biggest differences - how far do you really want to go? Much easier to buy a 500 than waste money though

There are tricks to reduce the drag, but not necessarily what you would want to use on the road. Ensuring good lubes, well warmed up & not overfilled is the sensible approach. Beyond reasonable servicing these things are not really worth considering unless you are a complete RR tart IMHO;)

[4535jacks]

It was RR'd at austec, I'm concerned that 20% power drag could indicate a clutch or gearbox problem

[changingman]

4535jacks said:

It was RR'd at austec, I'm concerned that 20% power drag could indicate a clutch or gearbox problem

I'm having my 450 RR'd at Austec on 6th Jan, I'll let you know the figures

[dogbucket]

Mine was done at Austec last month and was 216.3bhp wheels / 271.9bhp fly, so similar drag to yours (55.6)

Edited by dogbucket on Saturday 27th December 21:05