The not-so-offical EVO 9 ECU tuning thread
Originally Posted by Terry S
From the looks of it, that blue run was on its way to about ~315whp...
Terry S
Terry S
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From: Danville/Blackhawk, California
Originally Posted by Doogie Howser
If thats the case than it is very scary on a dd dyno. This thread gets better and better.
Shiv
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From: Europe
Originally Posted by shiv@vishnu
Yep... that was a 93oct map
Shiv
Shiv
Thanks and keep up the great work.
p.s. If i ever own an evo ix, i want to be mapped by shiv@vishnu
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From: Davis, California
Originally Posted by RyanM
The car slipped on the dyno
Originally Posted by shiv@vishnu
nope
Originally Posted by shiv@vishnu
What happened was a temporary loss of *rear* roller contact.
-shiv
-shiv
And why would it slip well after reaching peak torque and receeding? Oh well. Nice numbers, Shiv.
Last edited by SaabTuner; Nov 28, 2005 at 04:13 PM.
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Originally Posted by SaabTuner
Hmmm ...
And why would it slip well after reaching peak torque and receeding? Oh well. Nice numbers, Shiv.
And why would it slip well after reaching peak torque and receeding? Oh well. Nice numbers, Shiv.
The rear tires were no longer in contact with the rear roller during peak torque. But that liftoff was not the cause of the power drop on the dyno sheet.
When the rear tires regained contact with the roller (once torque dropped enough to allow the car to settle back onto the rear roller), what you are seeing as a sharp power rolloff in the dyno plot is actually the power required to accelerate the rear roller back up to speed.
So it wasn't wheelspin on the rollers that caused the apparent power drop, it was the touchdown of the rear tires.
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From: Davis, California
Originally Posted by Ron
I'll take a stab at that one.
The rear tires were no longer in contact with the rear roller during peak torque. But that liftoff was not the cause of the power drop on the dyno sheet.
When the rear tires regained contact with the roller (once torque dropped enough to allow the car to settle back onto the rear roller), what you are seeing as a sharp power rolloff in the dyno plot is actually the power required to accelerate the rear roller back up to speed.
So it wasn't wheelspin on the rollers that caused the apparent power drop, it was the touchdown of the rear tires.
The rear tires were no longer in contact with the rear roller during peak torque. But that liftoff was not the cause of the power drop on the dyno sheet.
When the rear tires regained contact with the roller (once torque dropped enough to allow the car to settle back onto the rear roller), what you are seeing as a sharp power rolloff in the dyno plot is actually the power required to accelerate the rear roller back up to speed.
So it wasn't wheelspin on the rollers that caused the apparent power drop, it was the touchdown of the rear tires.
But consider this: if the tires slip they will start to move quite a bit faster than the roller itself. So when they touchdown, the momentum of the now faster-spinning wheels/brakes/tires will create a sudden rise in the accelleration of the rear roller. Actually, you can see that rise in the blue graph juuuuuust before it ends. That was probably touchdown. Though it still seems weird for them to slip well after the torque peak.
-Adrian
edit: Does anyone know for sure if the Dyno Dynamics dynos lock the front and rear wheels at the same rotational speed? Just want to rule out that center-diff being related to this at all. (Besides, if they aren't it could be bad for the diff.)
Originally Posted by EVIL_EVO_VIII
Damn those IX''s are making the same numbers 05s would make with the addition of cams!!!!!!!! Im curious to see an 05 with a IX turbo on it with same mods to compare.
