I borrowed a performance meter off a mate, it's really cool, dunno how accurate but seems pretty good - enter the weight of your car (I used the weighbridge at work), it picks up on the frequency of the pulses from the coil (atmospheric, not wired) and it's got accelerometers in it that measure the acceleration/braking g force. Those parameters combined and it can work out damn near anything.

the only mode I could figure out was the 1/4 mile - it tells you to launch when ready, and flashes a light when it's worked out that you've done the 400 meters. My terminal velocity was 125k's, ET was 17.3 seconds, and it said 38.1 kw (51bhp) @ 5200 rpm and 39nm at 4800. Sounds pretty accurate for a warm 1293 with twin 1.5" SU's, 286 cam but it's being choked by an unported Cooper S head, my ported one was awesome, but ended up with heaps of cracks in it

These figures are at the wheels, I want to know if anyone has experience of putting their motor on an engine dyno then sticking it in a car and putting it on a car dyno, and what the transmission losses were. I've heard people suggest a percentage, but that's gotta be a load of crap - if I have a 50bhp motor on a gearbox and it's losses are 30%, then the gearbox saps 15bhp, but if I put a 100bhp motor on the same gearbox, the gearbox doesn't suddenly find a way to sap 30bhp.

So, how about it - any suggestions what my engine bhp is? or any comparisons on bhp at the wheels?

hey dude,

i've read in a few different places that a % loss is correct (usually about 25-30% i think). I understand what you're saying about transmission losses....but, generally perfromance engines are louder, run hotter etc than stockies....so there's an increased power loss from those areas already

just an idea

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well, for new cars, you can generally find the drivetrain loss figures in the owners manaul. I think my VN bummadore lost 47 Hp in drivetrain loss. The Auto transmission will sap about 30 hp of that though.

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All my old engineering texts talk in % loss.

Sorry, the more you start with does not make the transmission more efficient.

But 51 hp at the wheels is not bad for the mods you are describing

Michael

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