PURVENOM Posted July 16, 2008 Report Share Posted July 16, 2008 http://jalopnik.com/398666/2008-shelby-gt5...han-ford-claims Link to comment Share on other sites More sharing options...
gc12 Posted July 17, 2008 Report Share Posted July 17, 2008 http://jalopnik.com/398666/2008-shelby-gt5...han-ford-claims Simply amazing Link to comment Share on other sites More sharing options...
ntsck Posted July 17, 2008 Report Share Posted July 17, 2008 "15%" driveline loss BS goes away at these power levels. People are gullible. Link to comment Share on other sites More sharing options...
Aussie67 Posted July 18, 2008 Report Share Posted July 18, 2008 "15%" driveline loss BS goes away at these power levels. People are gullible. ????? I don't understand your comment. 15% is the rule of thumb used by most for manual transmission. Link to comment Share on other sites More sharing options...
ntsck Posted July 18, 2008 Report Share Posted July 18, 2008 ????? I don't understand your comment. 15% is the rule of thumb used by most for manual transmission. They used a Dyna-pack dyno. Driveline loss does not scale in a linear fasion. A 1000 HP GT500 engine wouldn't automatically measure 850 RWHP. There are a TON of variables. STD v SAE rating, type of dyno used ( Mustang, Dynapack, Dyno Dynamics, Dynojet, etc ). A C6 vette only shows a 9% driveline loss ( when stock ), actually verified. 509 on a Dyna-pack, I'd guess that KR would show 545HP SAE at the crank. Still, it's more than 540! Dyna-Pack dynos connect straight to the hub with the wheels off, DynoJets are inertia type roller dynos. A Dynapack is one of the highest reading dynos there is. Stock GT500's can hit 485 RWHP off the showroom flow on those dynos, then 440 RWHP on a Dynojet, and then 395 RWHP on a Mustang Dyno. You wouldn't believe all the different numbers you'd get testing the SAME CAR on the different dynos. The Dyna-pack will almost always result in numbers about 10-15% higher than what you'll see on the Dynojet. Dyna-Pack Removes the wheels and measure directly from the hub. Removing 40-52lb in unsprung and rotational weight is very significant. This dyno is also a load/brake dyno which means the operator can vary the load (brake) therefore influencing the numbers. Brake dynos are great for tuning purposes since you can vary load and tune for real world driving situations. DynoJet- This is an inertia dyno. You simply roll the drive wheels onto a set of ~2000lb drums. You put the car in a 1:1 gear and measure the time it takes to spin the drums in relation to engine rpm. From there, torque is read and HP is calculated. Words of wisdom: 1) A dyno is a tuning tool...that's all. You use it to measure gains and losses from mods. 2) All dynos read a little differently 3) Only be concerned about what your car gets and not what Joe Blow's car did 5 states away. It's apples to oranges. 4) A 440rwhp GT500 run on a Dynojet will most likely run the same ET/MPH as a 485rwhp GT500 run on a Dyna-Pack. 5) You can make any dyno show power that's not really there (ie adjusting load, correction factors, atmospheric conditions). Dyno's are for tuning, not determining crank horsepower by applying bogus math. Link to comment Share on other sites More sharing options...
Aussie67 Posted July 18, 2008 Report Share Posted July 18, 2008 They used a Dyna-pack dyno. Driveline loss does not scale in a linear fasion. A 1000 HP GT500 engine wouldn't automatically measure 850 RWHP. There are a TON of variables. STD v SAE rating, type of dyno used ( Mustang, Dynapack, Dyno Dynamics, Dynojet, etc ). A C6 vette only shows a 9% driveline loss ( when stock ), actually verified. 509 on a Dyna-pack, I'd guess that KR would show 545HP SAE at the crank. Still, it's more than 540! Dyna-Pack dynos connect straight to the hub with the wheels off, DynoJets are inertia type roller dynos. A Dynapack is one of the highest reading dynos there is. Stock GT500's can hit 485 RWHP off the showroom flow on those dynos, then 440 RWHP on a Dynojet, and then 395 RWHP on a Mustang Dyno. You wouldn't believe all the different numbers you'd get testing the SAME CAR on the different dynos. The Dyna-pack will almost always result in numbers about 10-15% higher than what you'll see on the Dynojet. Dyna-Pack Removes the wheels and measure directly from the hub. Removing 40-52lb in unsprung and rotational weight is very significant. This dyno is also a load/brake dyno which means the operator can vary the load (brake) therefore influencing the numbers. Brake dynos are great for tuning purposes since you can vary load and tune for real world driving situations. DynoJet- This is an inertia dyno. You simply roll the drive wheels onto a set of ~2000lb drums. You put the car in a 1:1 gear and measure the time it takes to spin the drums in relation to engine rpm. From there, torque is read and HP is calculated. Words of wisdom: 1) A dyno is a tuning tool...that's all. You use it to measure gains and losses from mods. 2) All dynos read a little differently 3) Only be concerned about what your car gets and not what Joe Blow's car did 5 states away. It's apples to oranges. 4) A 440rwhp GT500 run on a Dynojet will most likely run the same ET/MPH as a 485rwhp GT500 run on a Dyna-Pack. 5) You can make any dyno show power that's not really there (ie adjusting load, correction factors, atmospheric conditions). Dyno's are for tuning, not determining crank horsepower by applying bogus math. Thanks much for the explanation. I appreciate the effort you have given to explain this. Link to comment Share on other sites More sharing options...
gc12 Posted July 18, 2008 Report Share Posted July 18, 2008 Same for me. Thank you. I didn't know half of it. Now I will die a little more clever than before I red your explainations Link to comment Share on other sites More sharing options...
1sweetazzgt500 Posted August 17, 2008 Report Share Posted August 17, 2008 That kinda burns me up that these Mustang Mag's are making thr KR look more powerful than it really is by using a "Dyna Pack" dyno which many of us don't know about (myself included). Personally for 80K there's no-way I"m buying one. JMHO. Link to comment Share on other sites More sharing options...
ingram4868 Posted August 17, 2008 Report Share Posted August 17, 2008 Wow. That is good info to know Link to comment Share on other sites More sharing options...
carnut Posted August 18, 2008 Report Share Posted August 18, 2008 I'm sure mine will have a gazillion horsepower. Link to comment Share on other sites More sharing options...
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