Dyno questions

[UP N MTNS]

Going to get the truck Dyno'ed next week at a shop that does alot of diesel's.



This is my first time, is there anything I should know going in? What they will do,what not to let them do... etc They want $100,is that about the going rate?



Thanks,

Adam

 

[KLockliear]

Seems a little on the high side, but not too far out there. Hopefully, if they do a lot of diesels as you say, they will have the optical rpm pickup for a tach/torque reading.



If you have a manual trans, <400rwhp, make sure they dyno in 4th gear (5-speed) or 5th gear (6-speed). If you are over 400rwhp, dyno in high gear (overdrive).



With an auto trans, make sure they dyno it in OD, with the converter locked. Pretty simple other than those basics.

 

[donnier]

Let us know how you do.

 

[RustyJC]

If it's an inertial dyno (e. g. , Dynojet 246C), keep this in mind. I made 4 pulls, 2 in 5th gear (1:1) and 2 in 6th gear (OD). The 5th gear pulls averaged 325/650. The 6th gear pulls gave 347/762. This is because running in OD tricks the engine into thinking the dyno rollers have more inertia than they really do - this loads the engine more and helps the turbo spool faster and harder.



For the above, I paid $60. 00, and the shop did have the optical engine speed pickup to calculate torque.



Rusty