Can someone post Mmart's J-31 dyno sheet thats been floating? I cant find an alive link
08-23-2007, 01:51 PM
#2
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Here is a dyno from Alen with the J31.
<center><img src="http://www.vizualflux.com/linkedpics/jan07dynoday/alendyno.jpg"></center><p>
Here is the crank hp #'s posted by MMart.
Giac J31 software. 250hp, 344 tq - mmart6545 2004-03-09 11:59:53
Here he posts his whp #'s.
My J31 dyno has been reposted countless times...215hp/270tq - mmart6545 2006-06-05 08:29:07
Here is the crank hp #'s posted by MMart.
Giac J31 software. 250hp, 344 tq - mmart6545 2004-03-09 11:59:53
Here he posts his whp #'s.
My J31 dyno has been reposted countless times...215hp/270tq - mmart6545 2006-06-05 08:29:07
08-23-2007, 09:24 PM
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I am not sure if it was closing the throttle but I just think that the huge drop in power and
torque is from the fact that the turbo cannot spool that much more boost for the entire rpm range.
As you can see it spikes to crazy numbers so early in the powerband (and boost goes crazy) as it advances timing...
Then, since it was running on pump for that dyno, it cannot continually run on such highly advanced timing...so then the boost drops and so does the power/torque.
I'm sure if I ran race fuel that the spike would probably stay the same but the let-off would be less dramatic.
As you can see it spikes to crazy numbers so early in the powerband (and boost goes crazy) as it advances timing...
Then, since it was running on pump for that dyno, it cannot continually run on such highly advanced timing...so then the boost drops and so does the power/torque.
I'm sure if I ran race fuel that the spike would probably stay the same but the let-off would be less dramatic.
08-24-2007, 09:06 AM
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Well if it was just a boost spike
the dip would have been right after peak tq not 1k rpms later. Something else caused the big dip at 4300 rpms which caused a 50+ tq and 50 hp drop in power.
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