Has anyone dynoed their G35 yet?
#2
08-21-2002, 08:18 PM
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Re: Has anyone dynoed their G35 yet?
My G35 dyno'd at 214 peak rear-wheel hp in 3rd gear at 6400 rpm. Several others have posted their dyno results on freshalloy.com, and they were all about 212-215. That's about right -- an 18-20% driveline loss is typical for an automatic.
My peak torque was 211 ft-lbs at 4600rpm. Others reported about 216.
However acceleration involves much more than peak hp or torque. Area under the hp and torque curves (how rapidly they ramp up from low rpm) is critical. A sag or dropoff anywhere in the rev band will hurt performance, even if the engine ultimately achieves expected peak hp and torque.
It would be interesting if everybody could post scans of their dyno charts to some location. But even then, comparing them isn't always simple. If everybody used a Dynojet (a common brand of dyno), and tested in (say) 3rd gear, and started the full-throttle test from (say) 3500 rpm, it would be easier. Ideally the interested parties should agree on the test conditions before the dyno run, so comparing the results are easier.
Peak hp doesn't always produce the desired acceleration. which is usually the ultimate goal. Considering that, it would probably be easier (and cheaper) if people just posted their 0-60 times, with the conditions and technique. Although the 0-60 results would vary with conditions (unlike Dyno runs that are SAE corrected for temp, altitude, etc) at least we'd know what those conditions were. Since 0-60 runs are a lot cheaper than dyno runs, we'd have a lot more data.
-- Joe
My peak torque was 211 ft-lbs at 4600rpm. Others reported about 216.
However acceleration involves much more than peak hp or torque. Area under the hp and torque curves (how rapidly they ramp up from low rpm) is critical. A sag or dropoff anywhere in the rev band will hurt performance, even if the engine ultimately achieves expected peak hp and torque.
It would be interesting if everybody could post scans of their dyno charts to some location. But even then, comparing them isn't always simple. If everybody used a Dynojet (a common brand of dyno), and tested in (say) 3rd gear, and started the full-throttle test from (say) 3500 rpm, it would be easier. Ideally the interested parties should agree on the test conditions before the dyno run, so comparing the results are easier.
Peak hp doesn't always produce the desired acceleration. which is usually the ultimate goal. Considering that, it would probably be easier (and cheaper) if people just posted their 0-60 times, with the conditions and technique. Although the 0-60 results would vary with conditions (unlike Dyno runs that are SAE corrected for temp, altitude, etc) at least we'd know what those conditions were. Since 0-60 runs are a lot cheaper than dyno runs, we'd have a lot more data.
-- Joe
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