Dyno Time......Again, City On STM Dyno
Posted: Sun Feb 01, 2015 9:08 am
Haha yeah i only just found out from a friend, totally wasn't expecting that. I've been meaning to post up the dyno charts to show how disappointed i am at the lacking of power on the dyno but that's not to say the car isn't performing, in fact its running really consistent now & didn't miss a beat on the dyno.
Anyway this time i only got 94wkw which is 9wkw less than the other dyno, so it goes to show there is a massive power difference between 'Rolling Road' & 'Hub' dynos (DynaPac). STM did say their dyno is a low reading dyno but at least the figures are more likely to be accurate & not overrated so i would rather take the lower power figure to be the more realistic one.
Just pointing out that STM use Dynapack dyno's that are bolted to the hub & the other dyno's i've used are in Hastings & Tauranga which are Rolling Road Dyno's which are drum rollers that the car is driven on so theres no need to calculate the wheel diameter/circumference for wheel speeds as the drum is already calibrated.
As for the nitrous well damn i was way off, i can't work out how the nitrous seems to perform better than running HI BOOST which is almost 20wkw more, the only thing i can put it down to is that the nitrous creates so much torque down low that it compensates for lack of power, down side to the nitrous is that the torque drops rapidly as the revs climb, i don't know but it feels better than on 24psi boost.
One thing to take note of is that the T1 injectors started to lean out at around 22psi, although still ok the tuner said it just falls below the safe A/F ratio, so with that said about 20psi is about tops for T1 injectors & they have a good A/F ratio on 18-20psi, note that i am running a VL Commodore fuel pump & adjustable fuel pressure regulator which is likely to help with fuel delivery.
KEY:
Blue - 10psi boost with igniton retarded around 5degree (ready for nitrous so power is right down), probably would have made between 50 & 55wkw if timing was set to normal.
Pink - 10psi boost with 50hp nitrous shot (30kw more at wheels)
Red - 20psi Boost (correct timing) 83wkw
Green - 24psi (correct timing) 94wkw
Anyway this time i only got 94wkw which is 9wkw less than the other dyno, so it goes to show there is a massive power difference between 'Rolling Road' & 'Hub' dynos (DynaPac). STM did say their dyno is a low reading dyno but at least the figures are more likely to be accurate & not overrated so i would rather take the lower power figure to be the more realistic one.
Just pointing out that STM use Dynapack dyno's that are bolted to the hub & the other dyno's i've used are in Hastings & Tauranga which are Rolling Road Dyno's which are drum rollers that the car is driven on so theres no need to calculate the wheel diameter/circumference for wheel speeds as the drum is already calibrated.
As for the nitrous well damn i was way off, i can't work out how the nitrous seems to perform better than running HI BOOST which is almost 20wkw more, the only thing i can put it down to is that the nitrous creates so much torque down low that it compensates for lack of power, down side to the nitrous is that the torque drops rapidly as the revs climb, i don't know but it feels better than on 24psi boost.
One thing to take note of is that the T1 injectors started to lean out at around 22psi, although still ok the tuner said it just falls below the safe A/F ratio, so with that said about 20psi is about tops for T1 injectors & they have a good A/F ratio on 18-20psi, note that i am running a VL Commodore fuel pump & adjustable fuel pressure regulator which is likely to help with fuel delivery.
KEY:
Blue - 10psi boost with igniton retarded around 5degree (ready for nitrous so power is right down), probably would have made between 50 & 55wkw if timing was set to normal.
Pink - 10psi boost with 50hp nitrous shot (30kw more at wheels)
Red - 20psi Boost (correct timing) 83wkw
Green - 24psi (correct timing) 94wkw