First of all this is not any type of attack or anything negative. I have full respect for guys running in the 10's and very low 11's with Evo Green's. But I must say I just am amazed at the times these cars are running.

For example, don't mean to single any one person out, but take user on this board OKIX... he ran 10.8@128mph.

Now if you plug that into any type of horsepower calculator on the net, with the weight of an Evo with driver... what do you get?

I'm using this calulator: http://www.dsm.org/tools/calchp.htm

And I get using 3400 lbs:

Using the ET method, I come up with 533 horsepower
Using the Speed method, I come up with 556 horsepower

But OKIX's car made 420 whp on Buschur dyno. So seemingly the hp calculator is off by over 100 whp.

Interested in ideas to explain the discrepancy.

Again big respect to these guys who have great running cars making a ton of power in a car that must be a blast to drive.

 

Way less weight at the track.

 

+1 on weight

I'm doing a lot of turbo research before I buy, and I've seen where a stripped down RS can hit around 3000lbs.

Also, Buschur's dyno reads low.

 

good driver??

 

that actually sounds about right with the horsepower numbers. I believe bushur uses a mustang dyno. So on a dynojet, the car could make about 460-470 ish? Then convert wheel to crank and your in the ball park of 533.

And btw, I wouldn't rely on an online calculator for these type of things

 

plus factor in the AWD launch. Not many can out launch it

 

I know what you mean... but the calculator is supposed to give wheel hp. For example... if I plug in like a low 13 ET and 3400 lbs... I get.... oh ****... it gives me: 279 hp! Well jeesh maybe this thing is giving hp at the crank.

 

You guys are right about the weight, well almost anyhow. Dont forget to add the drivers weight.

-Em

 

uh dude. TQ! look at how much tq that car makes.. like 550 dynojet. plus the car is prolly around 3100 w/driver all those BR sponsored cars are light.

Also he had the front of the car taped up for areo reasons which THANKS FOR THE IDEA!

and some serious drag wheels/ lighter brakes / sticky tires.

 

3 huge mistakes. 1) his car weighs much less than 3400lbs from what I understand and two, the Buschur dyno reads very low. He would be around 480-500whp on a Dynojet. 3)horsepower calculators are retarded and dont factor in aerodynamics, track conditions, etc.

 

Dude:

I ran a software development firm for 10 years. You just got had by a variable. Dynos are not uniform, never will be unless there is only one left in the world. (fat chance)

The only thing that counts is the ET speeds. I saw a VW 132 that the guy was screaming at NOPI had 700 wheel horse power. The Best ET with slicks he got out of it was mid eleven. Great horsepower but no stickem.

I had my car dyno'd on a Mustang that said 290 whp, a day later the shop guy called me and asked me to come back because while they replaced a broken torque sensor they found a bad board.

I went back the following weekend and was pulling 392 whp. OOPS same fuel and all what this tells you is the only truth is in the 1320 time slips.

Read em and cheer or you can do what I did and say I just do not give a hoot any more. I broke too many drive line parts over the years. So just drive your car and enjoy it or become a slave to this kind of or stuff

-P-

 

see if this helps ya at all.

I believe the weight of my car with me in it is about 3180lbs and the peak whp was 425. I think it comes out to about 516 crank hp. Correct me if im wrong.

As for me being a Buschur sponsored car....I am not in anyway. I just use products that are well built and proven. Now would I like to be? Hell ya. who wouldnt?

 

^^^I have to agree with the whole dyno thing. None of them will read the same. As far as which one you use, to me it's always a lot more fun to be dynoed on a Mustang or Dyno Dynamics that reads a good bit lower. Then when you smoke a Dynojet tuned 450whp car with your Mustang Dyno tuned 360whp car, it makes you look that much better!

 

With that weight I get HP of 499 or 520. So say avg is 510. Which sounds about right for how low Buschur's dyno reads. In this case I would say that the dyno, track results, and online HP calculators actually all match up.

 

crcain, the car IS a blast to drive on the street! Whenever I want to take it for a spirited logging session on a closed course area, I tell OKIX I've got a new map I want to test. So far, he's bought it every time. The goal for the car was high street torque with the least amount of street to strip type changing. Previous to the last 3track sessions (Noble, Tulsa and Norwalk) we would just nearly fill it with 101 at the service station and I would change the boost and maps at the track. It only took about 20 minutes to have it ready for the staging lanes. Now, we keep the import fuel in the trailer, so we add a couple of gallons, load the race maps, and check tire pressures, oil, etc. Sometimes, after the races, I'll just lower boost, put a 'street' version of the race map in it, give the tires some air and OKIX would go cruising with his friends. The car is incredibly street driveable. You would NEVER know that it's a 10 sec car. I'm sure after the coming cam comparisons, it might be a little more lumpy, depending on the cams we stay with, but I don't expect to lose much streetability. Our main 2 goals are fast as hell at the strip(hopefully 10.5's), with ton's of torque for the spirited street driving. I'm anxious to start on the cam comparison and we'll know more about which cams will help us with our next level of performance. We're trying for 10.5s at 132. Don't know if we'll make it, but I calculate that if we can get the car to 3080 lbs and add 33 whp through the cams, porting and a little more tuning, we'll be very close. The weight is fairly easy, since we're at 3180 with full seats and crash bars. The removal of the front seats, rear seats and replacing the drivers seat with an NRG Carbon Fiber Seat we have, we'll be very close to the 3080 goal. The 4100 RPM 481 lb/ft torque helps the launching and street driving fun. The 425 whp is fairly flat throughout the mid-high rpm range, so when OKIX shifts, the rpms are still at 400+ whp. Since it's an RS, the weight is already fairly low when compared to the MR. Thanks for the comments. It's nice to see that someone recognizes how difficult it is to reach the 10 sec club on a Green.
I've been making notes as to our changes and resulting whp/wtq on the Mustang Dyno. Each part or tune has been fairly well documented as to the ET/MPH results, or the WHP/WTQ on the dyno. Sometime, I intend to make the 'OUR PATH TO OUR RESULTS' type post, giving parts and tuning changes along the way.