JK's VA 200+ dyno numbers?? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 04-05-2006, 04:36 AM Thread Starter
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Question JK's VA 200+ dyno numbers??

The ride:
'01 GMC, ext cab, long bed, 4x4, ZF6 manual trans, stock size 245/75/R16 tires, stock air filter in swiss cheesed box, modded PPE boost valve, no lift pump setup, fresh fuel filter. Before any one asks, the clutch is stock and is holding at the moment. Never slipped yet...:bow:

The question at hand:
What will the JK tuned VA 200+ tune with 30 lbs of boost make on this type of setup.

The dyno will be a Superflow.

The plots on JK's site indicate it made around 475 HP and a shade over 900 ft-lb. Will the manual make more power as a result of less drive train loss?

Here is the plot from JK's site:




Since we are having tuner wars around here I might as well stir this topic up as well.:evil: Play nice please.:rules:

Justin

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post #2 of 8 (permalink) Old 04-05-2006, 01:00 PM
 
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If you have any questions on which test profile or parameters to use, just drop me an email.
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post #3 of 8 (permalink) Old 04-06-2006, 04:16 AM Thread Starter
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Email sent!

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post #4 of 8 (permalink) Old 04-06-2006, 04:40 AM
 
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I don't think your clutch will hold it. JJGMC's would slip by a mile rolling into it and it wasn't really abused otherwise...

P.S. the high position is in the middle on the switch. Without the switch or a resistor, you cannot get the high position...
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post #5 of 8 (permalink) Old 04-06-2006, 06:43 AM
 
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JK is right your clutch probly will slip. You may get lucky and have it hold for a few runs but that will be it. Now that I have my DDC in we probly could answer this ?.
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post #6 of 8 (permalink) Old 04-06-2006, 02:01 PM Thread Starter
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Yeah the clutch is stock. I haven't slipped it yet, I've found that if I shift carefully it will hold. I'm sure if I were to shift aggresively things will go to hell in no time. Unless I'm mistaken the dyno won't be more of a load on things than pulling a GN trailer around? I'm very aware of the positions on the switch, when I first installed it I was under the foolish impression that down was stock, middle was 150, and up was 200+. That was a fun first drive until I figured it out...

I still haven't decided what way to go with a clutch, so I'm going to use what I've got until then. I wish someone had a reasonably priced single disk unit that would hold some power...

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post #7 of 8 (permalink) Old 04-07-2006, 03:37 AM Thread Starter
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OK, I thought about it all day and came up with a question for JK or anyone who would know. The superflow puts a certain amount of load on the drivetrain to get it's reading correct? To relate this load into a real world comparison that I can understand, how would it equate in lbs/tons of load on a trailer? Basicly the dyno creates "X" amount of drag to simulate load on the engine under acceleration so comparing that to the drag pulling a trailer creates under acceleration should be possible correct?

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post #8 of 8 (permalink) Old 04-07-2006, 12:57 PM
 
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The Superflow can be set to control manually to a certain TQ, Load (eddy current field) percentage, or speed. There are numerous tests that test acceleration, deceleration, steady state, etc.

The test that I have suggested puts a heavy load on the truck and lets it accelerate at a linear rate. Acceleration is controlled to a time window. Data is recorded at 100 line per second and then Profilter analyzes the data and computes the results using data points (selectable by operator) every 50 RPM.

To assimilate this test in the read world, you would find a load with suficient resistance that it would take 12 seconds to sweep the gear with.
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