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Dyno in 5th or 6th gear ?

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Old Dec 10, 2006 | 04:34 PM
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Dyno in 5th or 6th gear ?
Getting ready to dyno my 2001.5 HO
Should I use 5th direct or 6th overdrive ?
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Old Dec 10, 2006 | 04:43 PM
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Before I got rid of my 6-speed I dyno'd it using 6th gear. You'll load the engine more and get more boost IMO.
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Old Dec 10, 2006 | 04:57 PM
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Post your numbers when you do it. I had the same combo for a while and have always been curious where I was.
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Old Dec 10, 2006 | 05:09 PM
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i dynoed in 5th. Because its direct. The dyno operator told me do run in whichever gear was direct. so i did. I never ran it in 6th to see what that would do, wasnt worth the 25 bucks to find out....
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Old Dec 10, 2006 | 05:16 PM
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your dyno operator is obviously from the gasser world...

you need to run these trucks in the highest gear possible to get the best numbers.
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Old Dec 10, 2006 | 05:32 PM
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Originally Posted by Forrest Nearing
your dyno operator is obviously from the gasser world...
uhh no not really. Him and his dad own a very popular diesel performance shop

now im not sayin that i would have seen more hp in 6th over 5th, all im sayin is that he should know
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Old Dec 10, 2006 | 05:51 PM
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Seems like 6th (or your highest final drive ratio) would give you the most time under max boost.

I bet a bone stock truck wouldn't care much if it was direct or overdrive, though.
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Old Dec 10, 2006 | 06:35 PM
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You should also pull on the dyno in your direct gear. Which ever is a 1:1 ratio.
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Old Dec 10, 2006 | 06:46 PM
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Originally Posted by Forrest Nearing
your dyno operator is obviously from the gasser world...

you need to run these trucks in the highest gear possible to get the best numbers.
Not on a load dyno.
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Old Dec 10, 2006 | 07:54 PM
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fair enough, I was under the impression that your HP would be slightly higher in direct, but torque would be much higher in OD
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Old Dec 11, 2006 | 12:51 AM
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HP wont be much higher in OD, maybe ~10HP. The TQ will be much higher, 100+. This is from my observations though. Maybe someone else's are diff.
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Old Dec 11, 2006 | 01:14 AM
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On a load dyno (Mustang, Dyno Dynamics) you want direct 1:1 like in a 6 speed that would be 5th gear.

An inertia dyno (Dyno Jet) you want to use OD...ie 6th gear on a 6 speed or 5th on a 5 speed.
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Old Dec 11, 2006 | 09:35 AM
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Originally Posted by PourinDiesel
On a load dyno (Mustang, Dyno Dynamics) you want direct 1:1 like in a 6 speed that would be 5th gear.

An inertia dyno (Dyno Jet) you want to use OD...ie 6th gear on a 6 speed or 5th on a 5 speed.
From a new one at the dyno... Why is this?? Just curious...
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Old Dec 11, 2006 | 12:50 PM
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Based on software...
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Old Dec 11, 2006 | 12:52 PM
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at bd, a load dyno, they had us 6speeders dyno in 5th.
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