Would this be from experience?? 
Dyno this weekend, quick question
Thread Starter
Safety Car
Joined: May 2004
Posts: 4,811
Likes: 2
From: Simpsonville SC
Dyno this weekend, quick question
Im going to a dyno this Sat and going to see what she has to the ground. My question is what gear should I be in? I heard 4th. But want to make sure. Thanks for the help!
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
A couple other suggestions:
(1) Wear stock rear wheels/tires with the pressure at 30 psi cold
(2) When you start the pull make sure your coolant temp is 185-194. Higher than that and your PCM will pull power.
(3) Once you arrive at the facility cool the car down. If its hot when you dyno, hot cats will cause the Air/Fuel ratio quite rich as fuel is dumped to cool the cat. After the car is cool, then manage the coolant temp to the target in (3).
(4) Ensure the dyno operator gives you the graphs in SAE and with smoothing turned on.
(5) Ask the operator for the Excel version of the dyno graphs too; this produces rpm/rwhp/rwtq values in numerical form, which are handy for doing shift point conversions.
Ranger
(1) Wear stock rear wheels/tires with the pressure at 30 psi cold
(2) When you start the pull make sure your coolant temp is 185-194. Higher than that and your PCM will pull power.
(3) Once you arrive at the facility cool the car down. If its hot when you dyno, hot cats will cause the Air/Fuel ratio quite rich as fuel is dumped to cool the cat. After the car is cool, then manage the coolant temp to the target in (3).
(4) Ensure the dyno operator gives you the graphs in SAE and with smoothing turned on.
(5) Ask the operator for the Excel version of the dyno graphs too; this produces rpm/rwhp/rwtq values in numerical form, which are handy for doing shift point conversions.
Ranger
Last edited by Ranger; May 12, 2006 at 02:45 PM.
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