Guys, if you want to discuss how power should be measured then by all means open up a thread to discuss it.
If you read back through this thread I have mentioned that a one off dyno figure can almost be meaningless as a comparison against other figures from a different dyno etc etc. However, a one off dyno reading regardless of what dyno it is done on and regardless of whether it shows power at the wheels or fly, is a good benchmark to use for future measurements, especially if modifications are to be done as long as it is done back on the same dyno. It will show a % increase or decrease, which for me would be a determining factor as too whether a mod is worthwhile or not.
The only time that dynoing a car for comparative bragging figures is relevant is when they are dynoed on the same dynomometer on the same day, and importantly set up in the same manner.
I've already said that my 238bhp might be 215bhp or 250bhp on another dyno........however, as another member has used this same dyno a couple of weeks ago and appears to have a good std figure for his TS, then I'd say that 238bhp is about right. I didn't get an at the wheels figure as on this dyno they only give you at the fly and yes it is likely to have been calculated with a set % increase over the at the wheels figure or they could have coasted down and calculated that way, not sure? The other dyno I normally use gives both figures, so next time I visit that dyno I'll post up both to keep everyone happy.
I've never said that the cat back exhaust has given an 18bhp increase, it will have given an increase but as I don't know what the std power was then it's hard to say.
Most petrolheads know that 4wd have greater transmission losses than a fwd car, so as mentioned, if they had the same bhp then at the wheels the fwd would have more power, however this doesn't always make it faster as the 4wd will have power at 4 wheels and not 2 so will have more traction........etc etc etc
Last edited by Cyclone; 23-01-10 at 17:31.