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Old 11-20-2004, 04:18 PM   #1
scooterforever
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Member#: 55011
Join Date: Feb 2004
Location: New England
Vehicle:
2002

Default Dyno tuning a 4EAT

Ok, so I am running a VF-34 setup (and supporting mods + EcuTek). My tuner is extremely accomplished, but my car was the first 4EAT he had worked on. The problem he was running into with my car on the dyno is that when he would put any amount of load on, the transmission would downshift and the car would try to leap off the dyno (or at least strain against the restraints). As a result, my dyno maps are crap, even though I know I am making the power one expects out of a VF-34, etc. So what is the solution?

Should he be locking it in 2nd gear for dyno and custom tuning? Am I limited to road dynoing? What are other 4EAT owners' experiences here? When the next group dyno day comes up I would like to put down some decent numbers on the graph (again, I know I am actually making the correct amount of power, so this is just a dyno vs. power-making question). Thanks,
-- scooterforever
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Old 11-21-2004, 12:31 AM   #2
Russ77
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yes. get it rolling up to speed in first, then do the testing in second. BUT, it must be shifted into neutral immediately at the end of the run. otherwise, it will buck on the dyno and try to come off due to the inability to upshift causing insane engine braking. it's a somewhat tricky procedure, but due to the way the shifter is gated, you just slap it forward into N. my tuner usually does it right around 6800rpm (on the downward slope of the hp curve anyway).
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Old 11-21-2004, 02:24 AM   #3
scooterforever
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Thanks, Russ77 -
scooter
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Old 11-21-2004, 02:23 PM   #4
Dyno Flash
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03 Evo 8 9.5 @ 149

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Tune it on the road ! IMHO road tuning is better for subys on the ecutek b/c you can get a more accutrate ign advance
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