Gearing will effect the HP if the gear ratio is off a few 10ths. It's a factor that effects the end result if the calibration is different across the machines, I have observed this on Dynapacks. It's not wrong, it just calculates the numbers a few percent higher or lower.

100hp a cylinder is easy with boost. I have seen turbo 996 P-cars in race trim close to 800hp.

 

Mr. Kibort has close to twice the torque. Perhaps your LS7 FD is the only way to get even.

 

SLB is on the 12th right? that's 12 eternities in last minute preparation between events

I am sure you'd prefer to get more time at BW if you can, there is a NASA event this weekend I believe.

Will you be entering in Mod or Unlimited? There is going to be much close competition this year in both classes.

Goodluck.

 

dooood! don't say torque to kibort.

torque doesn't matter. what you mean to say is kibort has a higher average hp over the usable rpm range than we do. Area under the curve if you will.

 

Thank you Ry! wheew, I thougth i would have to go into all the details of why the level of torque means nothing, its RPM AND Torque. IN otherwords, i could have 3x the torque, but the "Torque" at the rear wheels is the SAME if we have the same rear wheel HP at ANY vehicle speed (regardless of torque). after all:

acceleration= power/(mass x velocity) basic newtonian physics here!

you said it best. area under the curve can be better, as the big torque number or a torque number higher than HP number indicates that the HP curve is flatter and would yield more hp area under the curve . good catch!

Dont get me started !

mk

 

how does a gear ratio change " a few 10ths" on the dyno?
the "machine" (i supose you are talking about the dynojet chassis dyno), doesnt have an input for gear ratios. it is ONLY measuring rate of acceleration, or the rate of change of kinetic energy. it wouldnt know if you had a CVT or a dragster rear tire that grew with speed. all it knows is HP HP AND HP! faster rate of spinning the drums, the more hp you make. spin it at the same rate of acceleration, you have the same HP.

170hp per liter is incredibly impressive.
mk

 

There has to be a gear ratio calculation being done, or else a pull in 1st gear would result in more hp then one done in 6th, since obviously a car accelerates faster in 1st then in 6th.

 

Yes, I will be at BW this weekend. But not with the time attack car. It is still being worked on.

It is going to be mod class.

 

Really. I will be there with a whole gaggle of S2000's.

 

Great comment, i couldnt have paid you to post something better to strengthen the point.

No, gear ratios are never taken into account on a chassis dyno. why? because in its not a matter of acceleration of the drum, its a matter of the rate of change of its kinetic energy. (i.e. 1/2mv^2 ) . So, at the slower speed, 1st gear, if i apply the same HP to the drum, its rate of change of kinetic energy will be exactly the same as if i was in 5th gear at the same HP level (torque at rpm level). Thats why HP is such a useful value, it incorporates speed! torque wont tell you anything unless you attach a speed or RPM to it. sure, in 1st gear you have the most amount of torque, but you are using it at a slower speed compared to 5th gear.
So, no matter what your engine torque is at any speed compared to someone else, it will produce the same torque as generated (multiplied through gear ratios) at the rear wheels, as long as the HP value between the two being compared, is the same, at any same vehicle speed.

so, to put this in real life perspective. When Blackey and I come off turn 11 at Sears, if i have a flat hp curve and he has a climbing one, when we are running at some speed while at max HP , our rear wheel torque will be the same. (even if I have 3x the peak engine torque) however, if i have more HP at the beginning of a gear (due to the flat HP curve) i will have more torque at the rear wheels as multiplied through the gear box than Blackey, who's HP curve is still climbing. As Rylan says, its area under the HP curve . OR, as I like to say, who ever has the most HP/seconds, has the greatest acceleration potential for any speed range. (all other things being equal )

mk