chassis dyno fact or fiction
Posted: Sat Jun 23, 2018 5:55 pm
can you guys enlighten me on chassis dyno results please
here is the scenario,
my brother in law has a 2012 VE GTS commodore (pontiac) 4270 pounds with driver stock auto trans and rear gear, they put a vortec blower on the stock LS3 with a cam change chassis dyno says 600hp at the rear wheels,done approx 10 passes 11.14 @ 127mph on drag radial and pumpgas and street driving then kicked rods due to detonation everything junk start again.
buys new LS9 block (i think ) top dollar rotating assembly ,new stock heads,new blower etc everything brand new $ 40000 AU chassis dyno @ 630 hp at the rears now i dont have all the specs on everything about the car but i have my own opinion on the chassis dyno results.
raced at track last night (i was not there) but the guy who built the engine was there to check plugs etc,11.10 @ 126mph it has picked up a tenth in the 60 compared to the other engine.
now me thinks,
my own car runs 11.10 @ 121mph @ 3650 with me,sbc 383 that make 510 hp on pump never dynoed yes i have good converter 8'' 5600 and 4.1:1 rear gear on 255/60 drag radial.
NOW MY QUESTION IS - would the 630 rear wheel horsepower really be at the flywheel ??
i am only using the MOROSO slide rule as a guestiment,
i do remember him saying it is only around 8 psi boost and i am sure they will switch to E85 soon,
i am more interested in the chassis dyno theory as i am aware i am not comparing apples to apples here,any idea on what % of hp loss in drive train 20-30% ???
thanks for any input
here is the scenario,
my brother in law has a 2012 VE GTS commodore (pontiac) 4270 pounds with driver stock auto trans and rear gear, they put a vortec blower on the stock LS3 with a cam change chassis dyno says 600hp at the rear wheels,done approx 10 passes 11.14 @ 127mph on drag radial and pumpgas and street driving then kicked rods due to detonation everything junk start again.
buys new LS9 block (i think ) top dollar rotating assembly ,new stock heads,new blower etc everything brand new $ 40000 AU chassis dyno @ 630 hp at the rears now i dont have all the specs on everything about the car but i have my own opinion on the chassis dyno results.
raced at track last night (i was not there) but the guy who built the engine was there to check plugs etc,11.10 @ 126mph it has picked up a tenth in the 60 compared to the other engine.
now me thinks,
my own car runs 11.10 @ 121mph @ 3650 with me,sbc 383 that make 510 hp on pump never dynoed yes i have good converter 8'' 5600 and 4.1:1 rear gear on 255/60 drag radial.
NOW MY QUESTION IS - would the 630 rear wheel horsepower really be at the flywheel ??
i am only using the MOROSO slide rule as a guestiment,
i do remember him saying it is only around 8 psi boost and i am sure they will switch to E85 soon,
i am more interested in the chassis dyno theory as i am aware i am not comparing apples to apples here,any idea on what % of hp loss in drive train 20-30% ???
thanks for any input