shift points ?
Thread Starter
Instructor
Joined: Jun 2014
Posts: 134
Likes: 1
My 6al is set to 6600 which is where it falls on its face (tho the graph shows its 6200(blue line) but guess this is due to the dyno operator not hitting the stop run button as it cuts instead of after (this mustang dyno didn't use a tac wire )...
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
Based on THAT graph, I'd shift at 6200. By 6300, power has plummeted by at least 50hp depending on the run. I don't think that graph is useful for calc'ing ideal shift point as the run was cut off too soon.
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Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
As already mentioned above, I don't think that you can make a concise determination from that graph; dyno operator ended the run @~6000 RPM...so that "Drop dramatically" is a result of the throttle closing...not a natural taper of the tq curve. His ideal shift point would be higher than 6000, but hard to tell and impossible to calculate w/o the proper data there.
Thread Starter
Instructor
Joined: Jun 2014
Posts: 134
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Where the graph begins to decline is where the 6al is cutting spark. So my thinking is the dyno operator didn't cut the dyno off till a sec or 2 later . guessing since he had the graph in the system set from 2500-6500 it based the run on the time between the start and stop functions . thus making it look as if my power falls off quickly based on acceleration cause once the ignition is cut it no longer increases rpm ... Wish I felt comefortable to extend the limiter to 7000 but without a a/f gauge on the dyno I didn't feel comfortable doing that
Race Director
Joined: Apr 2003
Posts: 17,698
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From: moraga ca
Where the graph begins to decline is where the 6al is cutting spark. So my thinking is the dyno operator didn't cut the dyno off till a sec or 2 later . guessing since he had the graph in the system set from 2500-6500 it based the run on the time between the start and stop functions . thus making it look as if my power falls off quickly based on acceleration cause once the ignition is cut it no longer increases rpm ... Wish I felt comefortable to extend the limiter to 7000 but without a a/f gauge on the dyno I didn't feel comfortable doing that
Thread Starter
Instructor
Joined: Jun 2014
Posts: 134
Likes: 1
It had one but he couldn't get it to work.... They mostly do diesel tuning ... But yea I wasn't happy about that ... I have a gauge installed but always like to confirm that's it right with a proven one ....
Race Director
Joined: Jan 2005
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From: Slidell Louisiana
Go to a dynoshop that will do pulls while logging the A/F you may be surprised at the result.
Le Mans Master
Joined: Sep 2013
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From: near the thumb in the mitten
Between 5250 and 6000 depending on competition and type of event. To stretch over 6k, because it would not happen just once, I would have to know engine will take it. A broken valve spring for example would make for a bad day.