Does anyone know the powertrain loss percentage of honda transmissions? I couldn't find any bone stock base whp to use for calculating. Or I need the base whp of b18b. Thanks a lot.

 

I've heard and read and seen kinda supported by dynos that b-series manuals tend to lose about 15%, and b-series autos lose about 30%. It's only a rough figure though.

 

I use 16% total drive train loss for my calculations for my '96 GSR. This number seems to be a good rough estimate. If you look at stock Integras on a wheel dyno it seems to come out about right, assuming Hondas #s for crank HP are accurate. The exception seems to be 98+ GSRs which seem to come out to 22%. They dyno near 133ish, so if the 170HP claimed by Acura is accurate that'd be a 22% loss. Something seems fishy with OBDIIb+.

 

Thanks a lot. I'll try using 17-16% for my b18b mannual tranny. How much do lighter flywheels help you think? For example the JUN one?

 

I'm going with the Exedy flywheel/clutch combo when my original clutch croaks. IT WON'T DIE! I think the Jun is chromoly and around 9lbs like the Exedy, if I recall rightly. They remove a significant load from the engine and allow faster revving. This is clearly beneficial for our cars since they don't make allot of power at low engine speeds. I've driven a Honda(not teg) with a lightened flywheel and it did rev very quickly, which to me made it more fun to drive. I haven't seen much of anything to quantify the performance gained by replacing the stock flywheel with a lighter aftermarket one however, I fail to see how it could not improve performance if you're getting into your powerband sooner. I wouldn't expect a huge boost though, merely a change in character and perhaps longer engine(bearing) life.