2002 dyno #"s
1 - 6 of 6 Posts
If the same factory test technique is used as for the 405hp ZR-1s, the new LS6 should allow chassis dyno #s more like 360 HP "nominally".
I notice people who dyno their cars tend to over estimate the driveline loss factor (DLF), some as high as 18-20%!!!
Maybe driveline losses can get that high in an automatic, but not likely with a manual transmission. Either that, or people who have dyno'd their cars assume they put out exactly factory nominal spec horsepower (SAE corrected) at the crank.
IMO, the driveline loss is actually closer to 10% for a manual tranny. No two LS6 engines will dyno exactly the same. Some will dyno lower, some higher, differences between engines are unavoidable, provided they don't fall outside the tolerance band set by the factory for an acceptable engine. The question is what is the tolerance to spec?
It would be nice to think zero, but more likely +/-5% and those on the negative side not to exceed 20% of production yield.
Hopefully none of us will get any engines from that lower group in our Z06s.
375 / 0.926 = 405 (assuming DLF is 7.4%)
370 / 0.914 = 405 (assuming DLF is 8.6%)
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above this line would be rare statistically
_________________________________________
365 / 0.90 = 405 (assuming DLF is 10%)
360 / 0.89 = 405 (assuming DLF is 11%)
355 / 0.88 = 405 (assuming DLF is 12%)
-----------------------------------------
between these lines are probably where the majority of engines will be as a result of meeting acceptable limits during production
_________________________________________
350 / 0.86 = 405 (assuming DLF is 14%)
345 / 0.852 = 405 (assuming DLF is 14.8%)
340 / 0.84 = 405 (assuming DLF is 16%)
335 / 0.827 = 405 (assuming DLF is 17.3%)
-----------------------------------------
between these lines statistically rare
Let's hope no need to go any further. /phpBB/images/smiles/icon_wink.gif
I notice people who dyno their cars tend to over estimate the driveline loss factor (DLF), some as high as 18-20%!!!
Maybe driveline losses can get that high in an automatic, but not likely with a manual transmission. Either that, or people who have dyno'd their cars assume they put out exactly factory nominal spec horsepower (SAE corrected) at the crank.
IMO, the driveline loss is actually closer to 10% for a manual tranny. No two LS6 engines will dyno exactly the same. Some will dyno lower, some higher, differences between engines are unavoidable, provided they don't fall outside the tolerance band set by the factory for an acceptable engine. The question is what is the tolerance to spec?
It would be nice to think zero, but more likely +/-5% and those on the negative side not to exceed 20% of production yield.
Hopefully none of us will get any engines from that lower group in our Z06s.
375 / 0.926 = 405 (assuming DLF is 7.4%)
370 / 0.914 = 405 (assuming DLF is 8.6%)
-----------------------------------------
above this line would be rare statistically
_________________________________________
365 / 0.90 = 405 (assuming DLF is 10%)
360 / 0.89 = 405 (assuming DLF is 11%)
355 / 0.88 = 405 (assuming DLF is 12%)
-----------------------------------------
between these lines are probably where the majority of engines will be as a result of meeting acceptable limits during production
_________________________________________
350 / 0.86 = 405 (assuming DLF is 14%)
345 / 0.852 = 405 (assuming DLF is 14.8%)
340 / 0.84 = 405 (assuming DLF is 16%)
335 / 0.827 = 405 (assuming DLF is 17.3%)
-----------------------------------------
between these lines statistically rare
Let's hope no need to go any further. /phpBB/images/smiles/icon_wink.gif
Joined
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1,300 Posts
It depends what is changing. Most '01's seem to make mid 330's to 340 stock.
Now if I see guys that put on headers, exhaust, chips, pulleys and they are at mid 350's I would guess unless the factory does something dramatic I would be surprised to see more than mid 340's to 350 max.
Maybe the 405hp rating is just finally being honest.
Now if I see guys that put on headers, exhaust, chips, pulleys and they are at mid 350's I would guess unless the factory does something dramatic I would be surprised to see more than mid 340's to 350 max.
Maybe the 405hp rating is just finally being honest.
1 - 6 of 6 Posts
