Horsepower per pound of boost on average

[Kcjepperson]

What kind of horsepower averages are you getting with pump gas. I have heard you are limited to about 6# of boost on 91 octane. Just wondering what kind of horsepower you are getting out of 6# or so

 

[Sunvang]

186hp on 6psi, stock compression and 91 premium on a 2013 Polaris Assault.

 

[carms]

What about say 10lbs boost on straight c12?

 

[800dragon_rmk]

What elevation ?

 

[carms]

between 6-9000 ft

 

[Kcjepperson]

Is that for most turbos or what turbo would get 186 hp on 6 lbs boost

 

[aus091]

sunvang is at sea level getting 186

 

[Cody Phillips Racing]

On the dyno testing I've seen/done with a two stroke 800 you can generally hope for 8-10hp per lb of boost.

 

[Kcjepperson]

I am having par 910 put in my sled and wondering where it would run with the turbos. Cody you probably have more info than anyone on this since you are helping Brad with tuning.

 

[2XM3]

Well for what its worth, my mod sled (non-turbo) all carbon fiber edge chassis weights about 450 ish, and has a slp 903 in it, that motor produces a bit over 200 real hp at 5000 feet on 100% c-14, my good friend has a bd intercooled dragon, same hill, same trail.same day back to back hill climbs and races at 7500-9500 feet the turbo needed 9-10 psi to run pretty much dead equal to the 903, thats swapping riders as well. And the 903 would leave the turbo for dead in the drags at the gate, then turbo reeled it back in... just our own comparison. Oh my pro at 10 runs even with his dragon at 10 and hes 185 lbs, im 285

 

[blazer71]

I have to agree with Cody. This is a good rule of thumb and is pretty accurate for a SWAG not having access to a dyno.

On the dyno testing I've seen/done with a two stroke 800 you can generally hope for 8-10hp per lb of boost.

 

[milehighassassin]

It's not horsepower per lb of boost simply because not all boost is equal.

It's about airflow. What will move more water? A garden hose at 10 lbs of pressure or a fire hose at 5 lbs of pressure?



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[Kcjepperson]

Sounds good I will do so math when I get a final number from brad on what my motor is producing. I am thinking it ahou run around the 6-8 pounds or so. Thanks for all the respones