dyno "how to question"

[fearsno1]

how do you guys dyno your trucks? i am big into cars as i own a 07 shelby and have unlimited access to a dynojet dyno. i have been wanting to dyno my truck but i was told that the dyno needs to be loaded, we have load control on our dyno but it is not working right now due to a bad load cell, we haven't really ever used it as most of the cars we dyno don't really need it. i have always thought that the dyno would need to be loaded in order to really get the turbo spooled and something to "fight" against to get the right numbers. let me know how others have done it so i know what i need to do to dyno my truck.

also do you "have" to have a dyno tune or can you just run it in 5th (which i thought was the dyno gear anyway)

thanks
brandon

[08stroker250]

You don't have to run a "dyno" tune, but if you have one then I would run that. You want the converter locked up when you dyno. The dynojet I have always had my truck dynoed on gives about 40% load with the big drums that it uses. I don't think that is enough for these trucks though. I only make 35-39 lbs of boost, which hurts peak power on tunes where I make 45-50 on the street.

[08spartan250]

Originally Posted by 08stroker250

You don't have to run a "dyno" tune, but if you have one then I would run that. You want the converter locked up when you dyno. The dynojet I have always had my truck dynoed on gives about 40% load with the big drums that it uses. I don't think that is enough for these trucks though. I only make 35-39 lbs of boost, which hurts peak power on tunes where I make 45-50 on the street.

how do you know you are hitting 45-50 psi on the streets? is there a way to monitor boost on the spartan? i've just never found it. i just always see my boost gauge on the truck peg out..

[08stroker250]

Originally Posted by 08spartan250

how do you know you are hitting 45-50 psi on the streets? is there a way to monitor boost on the spartan? i've just never found it. i just always see my boost gauge on the truck peg out..

Manifold Gauge Pressure = Boost

[Snappy]

I hope to run my truck this month on a dyno with the 310, would I run that in drive or a lower gear? I know with the 310 my converter locks about 45 mph on the street would that be the same on a dyno? I would think it would be the same. They say the dyno im going to run on is pretty conservative and hard to get big numbers so it will be interesting.

[kuntryquesttsi]

Couldn't you brake boost to build some PSI?

[08stroker250]

Originally Posted by Snappy

I hope to run my truck this month on a dyno with the 310, would I run that in drive or a lower gear? I know with the 310 my converter locks about 45 mph on the street would that be the same on a dyno? I would think it would be the same. They say the dyno im going to run on is pretty conservative and hard to get big numbers so it will be interesting.

The truck needs to be at least around 65 mph so it doesn't downshift.

Originally Posted by kuntryquesttsi

Couldn't you brake boost to build some PSI?

It doesn't work on these trucks. We tried it this weekend. The horsepower numbers actually went down. Typically that works for trucks running a big single or a nice big set of twins.

[Snappy]

Cool thanks I'm anxious to see what it will run

[08spartan250]

awesome. thanks man. i knew it had to be on there. sometimes i'm just a

[fearsno1]

thanks for the help guys, i guess we will just have to have the load control function fixed to get accurate numbers, has anyone done a loaded then unloaded dyno to see the difference?