i dont know which is more amazing.. 700whp or 30deg Celcius in England??!!!

which one is the record!?

 

 

Normal race fuel.

Nothing to hide mate. Just missed you're post.

 

Isn't there a EVO 7 in Australia that has 1000 hp or something? That runs high 9's? Street legal?

I read that somewhere. It's the white EVo that costed $100,000 to build.

Maybe it's slower or less hp. I forget.

 

yeah right, Norris Designs dynoed their engine at 850hp and they ranned 10.1@139mph at the track - the fastest evo in US is the Turbotrix evo 10.9@132mph

 

yeh, norris designs. They ran that on regular premium fuel. And they actually didn't boost all the way as it could when they tested that, right?

 

This is off the RC site...
"10.935Secs - 1/4 mile The RC Evo at Santa Pod with 20mph head wind....."
BMan

 

I could not agree more - 700+ whp is simply unreal and is the only number worth noting. However claiming 930hp crank based on "simple" math is playing a little loose with the numbers.

Let's think through this empirically:

Stock EVO is rated at 271HP at the crank. Let's say it puts down 200hp at the wheels - a 71hp or 26% drivetrain loss. In other words it takes 71hp to move the weight of the car down the road, "drive" the drivetrain, etc. In the above claimed crank hp example, that amounts to 230hp (!) Why? Weight of the car is more or less the same, drivetrain has the same "resistance". Conclusion - drivetrain loss is a constant and should not be expressed as a percentage. ie crank hp is 700+71=771, not 930.

Now, I used simple logic, if I missed anything please tell me where I am wrong.

 

Gear meshes do not transmit torque with a loss of a constant value. Gear efficiency states that torque (and power) output is a percentage of torque (and power) input.
Geartrain efficiency depends on the types of gears (spur, helical, hypoid) and number of meshes used.
If the geartrain efficiency is 80%, then it outputs 80% of the input power. The greatest losses in an automotive drivetrain come from the right-angle gear meshes (usually the differentials).

 

Thanks for the info but it still does not make sense to me - RC EVO is "losing" more HP then I'm generating! Not that I do not trust you, but I'll ask our resident mech engineer to give me a primer on the physics behind this phenomenon. I'm always willing to learn...

 

I need to look into this as well. since hp != torque, I can understand where a gear has a percentage of torque since a 800hp F1 car only makes 250ft/lbs of torque at 15% loss it has 38 ft/lbs of torque loss. At 15,750 rpms would be 3x that torque or 114 hp.. But it is still only 38 ft/lbs of torque.. Hmmm.

That is a lot of heat generated in the driveline.. Must be why the drivelines are so prone to breaking. That could be like hitting it with a cutting torch if there is enough heat generated rapidly.

 

My mechanical engineer says the answer lies somewhere in the middle - given the drivetrain is more or less the same. Icreased torque will encounter greater resistance by the gears and hence more hp will indeed be lost. However, in no way is it a linear relationship, ie you will not experience the same 24% loss at 800hp as you would at 300hp.

 

No, there is a 9.6 second Evo 2 in the US.

 

They don't count the engines the wrong way round just kiddin josh...mr DSM

 

Are you sure? The only 9.x second Evo 2 I know about is the Aussie one.