Hi guys, i dynoed my 4port a couple of times and it always showes no powergain
above 5000 rpm, what can be causing this. The curve looks great until it hits the 5000 mark. Please help me!!! Mazda Belgium knows almost a year about this problem but haven't given me a solution yet.

 

Looks like a good dyno to me. You are putting to the groung only 20 HP less than the 6-port.

 

In the dyno i have 136rwhp, that's about 50rwhp less than the 6port.
It's supposed to have the most power at 7000 rpm, but after 5000 rpm it doesn't climb anymore, and what's causing the ditch in the graph. Keep in mind it's a 5speed, not an auto.

 

Maybe I'm readig it wrong, but it says your corrected peak power was 119 kW which is about 160 HP.

 

I believe that dyno (like most european dynos) calculate drivetrain losses and add them back into the dyno plot (hence you have a corrected and uncorrected line)

 

well there is no rpm on that graph and i dont knwo the gear to calculate it fromt he speed BUT even so it does appear to go back up. after the dip it doesnt stay flat. 119kw/16x hp seems right.