650 hp
Tech Contributor
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:-P
Melting Slicks
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Drifting
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From: Bristol, VT
It's also a Mustang current brake dyno that requires precise setup for each vehicle, and MT acknowledged that they didn't know the final drive or gear ratios when performing the test. Their published final drive rear end ratio is still not consistent with the leaked engineer presentation, so it's not confirmed they have the correct ratios even now.
I'm happy to be proven wrong be actual facts and discussion, but right now nothing really adds up to MT dyno results being possible, because it doesn't seem possible that GM could get an LT2 to that power level while still passing for oem nvh.
Melting Slicks
Joined: Aug 2014
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Something tells me this guy is going to die on his hill that the LT2 is a hp monster well above SAE.
GM has been pretty good to sticking with SAE numbers, and while there are occasional factory freaks which do better than advertised, they don't do that much better. The acceleration to 60mph is completely explained by the mid engine design and good gearing, no rigging of engines there. The final trap speed and 1/4 mile support the acceleration rate you'd get with that power along with the weight of the car. I've had 2 camaros and 3 corvettes that all put down 1/4 mile numbers that match up to their weight and 1/4 mile trap speeds along with their SAE corrected dyno readings. I'm sure a ton of other members can and will attest to this fact.
GM has been pretty good to sticking with SAE numbers, and while there are occasional factory freaks which do better than advertised, they don't do that much better. The acceleration to 60mph is completely explained by the mid engine design and good gearing, no rigging of engines there. The final trap speed and 1/4 mile support the acceleration rate you'd get with that power along with the weight of the car. I've had 2 camaros and 3 corvettes that all put down 1/4 mile numbers that match up to their weight and 1/4 mile trap speeds along with their SAE corrected dyno readings. I'm sure a ton of other members can and will attest to this fact.
Last edited by SladeX; Oct 29, 2019 at 02:56 PM.
Melting Slicks
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What could have GM done to the car to make that much extra power and still have the engine act like an oem NA engine without crazy lope and obviously increased redline, etc? During the entire dyno operation there's no way they could have missed any sort of forced induction.
It's also a Mustang current brake dyno that requires precise setup for each vehicle, and MT acknowledged that they didn't know the final drive or gear ratios when performing the test. Their published final drive rear end ratio is still not consistent with the leaked engineer presentation, so it's not confirmed they have the correct ratios even now.
I'm happy to be proven wrong be actual facts and discussion, but right now nothing really adds up to MT dyno results being possible, because it doesn't seem possible that GM could get an LT2 to that power level while still passing for oem nvh.
It's also a Mustang current brake dyno that requires precise setup for each vehicle, and MT acknowledged that they didn't know the final drive or gear ratios when performing the test. Their published final drive rear end ratio is still not consistent with the leaked engineer presentation, so it's not confirmed they have the correct ratios even now.
I'm happy to be proven wrong be actual facts and discussion, but right now nothing really adds up to MT dyno results being possible, because it doesn't seem possible that GM could get an LT2 to that power level while still passing for oem nvh.
Melting Slicks
Joined: Jan 2013
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Last edited by Lavender; Oct 29, 2019 at 03:02 PM.
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Melting Slicks
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Burning Brakes
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From: Aurora Colorado
Let's stick a pin in this. In a few months' time when Motor Trend gets a production car and they run it down the quarter, I'll bet you one of my sizeable pay check that they get a trap speed in the low 120s again. From there, they'll take it back to their dyno shop and run it. This time, it'll come in at the appropriate rear-wheel torque number we'd expect from an SAE-measured 470 crank. Between then and now, the dyno operator in question will have realized his set-up mistake and he'll have corrected it.
The key point here will be: same trap speed, but different rear-wheel torque number. You'll be expected to explain that. Thus the pin.
The key point here will be: same trap speed, but different rear-wheel torque number. You'll be expected to explain that. Thus the pin.
Team Owner
Joined: Feb 2013
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I don't own the opinion of more HP than claimed by GM. That opinion belongs to Motor Trend. They stood behind it, said they are certain of it and I'm repeating it. I would have expected you above all the shills to know the difference at your pay grade. I do however own the narrative that supplying a ringer was Chevrolet's way of assuring a successful 1st test, so that Motor Trend could say that GM "kept its promises." If you want to pin that, go for it. I actually hope that I am wrong about it, but automakers cheating is not new.
Melting Slicks
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Last edited by PRE-Z06; Oct 29, 2019 at 07:00 PM.