Red Beast Dyno Numbers!
10-29-2003 | 08:35 PM
#1
Thread Starter
Burning Brakes
Joined: Jan 2002
Posts: 1,099
Likes: 240
From: Michigan
Red Beast Dyno Numbers!
Okay,
After much frustration and lack of patience we have some first run numbers.
467 RWHP
480 RWTQ
This is on a Mustang 4 wheel drive dyno, SAE J1349, run in 4th gear on 91 octane fuel.
There is alot more potential here and GIAC will be running different maps over the next couple days. I am not sure what the boost level was with this run. As I get more info I will post it.
I have no idea what the real loss factor is he just said to me that a stock X50 on their dyno was less than 350 RWHP.
He also said that it was 40 more than the Stage 4GT that they ran on their dyno??
Since there is so much speculation about flywheel versus rearwheel numbers I decided to call the company that made the dyno. I talked to a guy at Mustang Dynometer and he said it is impossible to really convert rear wheel to flywheel. There are way too many variables, each car is different, conditions of the test are different, temperature is different etc... He said the only real way to get flywheel hp numbers is to yank the engine out and use an actual engine dyno and that is what the car makers do.
So converting all these numbers really doesn't make any sense. You have to compare rear wheel numbers and even then who knows! The real proof is in the pudding as in line up 2 cars and go head to head! That is all that really matters!
He did so if you want to guestimate it take the RWHP and divide by .75 this is for the Mustang 4 wheel dyno. There is more loss on a 4 wheel dyno versus a 2 wheel dyno.
So taking my 467 hp and dividing by .75 we get 623 hp and about 640 ft lb of torque. This was the base run as the car has been waiting for another project to finish to get on the dyno. We hope to be at least at 550 RWHP by the time we are done. Something over 700 at the flywheel!
After much frustration and lack of patience we have some first run numbers.
467 RWHP
480 RWTQ
This is on a Mustang 4 wheel drive dyno, SAE J1349, run in 4th gear on 91 octane fuel.
There is alot more potential here and GIAC will be running different maps over the next couple days. I am not sure what the boost level was with this run. As I get more info I will post it.
I have no idea what the real loss factor is he just said to me that a stock X50 on their dyno was less than 350 RWHP.
He also said that it was 40 more than the Stage 4GT that they ran on their dyno??
Since there is so much speculation about flywheel versus rearwheel numbers I decided to call the company that made the dyno. I talked to a guy at Mustang Dynometer and he said it is impossible to really convert rear wheel to flywheel. There are way too many variables, each car is different, conditions of the test are different, temperature is different etc... He said the only real way to get flywheel hp numbers is to yank the engine out and use an actual engine dyno and that is what the car makers do.
So converting all these numbers really doesn't make any sense. You have to compare rear wheel numbers and even then who knows! The real proof is in the pudding as in line up 2 cars and go head to head! That is all that really matters!
He did so if you want to guestimate it take the RWHP and divide by .75 this is for the Mustang 4 wheel dyno. There is more loss on a 4 wheel dyno versus a 2 wheel dyno.
So taking my 467 hp and dividing by .75 we get 623 hp and about 640 ft lb of torque. This was the base run as the car has been waiting for another project to finish to get on the dyno. We hope to be at least at 550 RWHP by the time we are done. Something over 700 at the flywheel!
