rolling road

[austin360]

anyone had there 325 sports on the rollers latley wondering what BHP you got and what mods you had to get what you did mine s going soon and wanted a bench mark to go of

[DHFiS]

These are the figures from the rolling road day in Ipswich

http://farm3.static.flickr.com/2570/418 ... 4c65d6.jpg

The top and bottom cars are 325s

[Jesus325iTouring]

In terms of engine there is no difference between the Sport and "standard" 325i,so,as a bench mark mine ran 167bhp on the rollers,not far off the 171 standard. My engine is also bog standard.

However,my last engine was tired and only managed 130bhp

[d6dph]

I have discussed my printout with someone who runs a rolling road firm (not the one that we went to Dan) and my graph and dan320is' graph did not have the correction values put in. So it makes mine about stock 170hp from our calculations.

[hongkongfuey]

mine was an f reg 325i 2dr (not a sport), with bbtb, hottuning 6 branch, stainless exhaust, second hand cam, and a chip, it just made 180hp and 190 lb/ft torque

[DHFiS]

I have discussed my printout with someone who runs a rolling road firm (not the one that we went to Dan) and my graph and dan320is' graph did not have the correction values put in. So it makes mine about stock 170hp from our calculations.

thats interesting. what would the correction do for my figure?

[d6dph]

Did yours have the second line, low down the graph? Mine and the homo's didn't and from what I remember we were the only two that didn't. We both made the correct power once that value had been taken into account.

[DHFiS]

Did yours have the second line, low down the graph? Mine and the homo's didn't and from what I remember we were the only two that didn't. We both made the correct power once that value had been taken into account.

http://img685.imageshack.us/img685/706/image001v.jpg

[d6dph]

The lowest line, Almost straight. I didn't get that on my graph. Stitched up once again

[StuBeeDoo]

So, what does that lower line correspond to then?

Last time I had a dyno run was c.1986 and in those days you didn't get a graph, just told what point the analogue dial got up to (and it wasn't very accurate!). .....And, obviously, all you got was the RWHP figure and a rough guess at what the flywheel HP was.

To the OP.... Sorry for spamming your thread.

[d6dph]

That's something to do with the correction value iirc, It did get explained to me but I'm a little hard of thinking. (retarded in english)

[stonesie]

I think that's the drag on the drive train, the RR should measure how much power the gearbox, diff ect are using on the run down and use that combined with the 'at the wheels' figure to give the flywheel figure.

[knightmare]

Looking at the graph and workings out on mine that sounds correct. averaged over 2 runs was 180.36 bhp at the wheels and and 206.85bhp at the fly wheel

[AlpineAde]

http://img685.imageshack.us/img685/706/image001v.jpg

What gear was that run done in? Looks like a 3rd gear pull.

[DHFiS]

http://img685.imageshack.us/img685/706/image001v.jpg

What gear was that run done in? Looks like a 3rd gear pull.

Looks like it. 83mph @ 6745rpm