Put My Truck on Dyno

[BIGGPIGG4x4]

Well, back in May I said if I didn't blow it up by Indy 4x4 Jamboree I would dyno it.

So, put it on the dyno as it sits with whats in sig. And it made 373 hp and 671 ft lbs.

I thought that was a little low, considering Ive seen truck with similar mods hit 450-470 hp. I was hoping for 400 hp and 700 torque on 38s.

A diesel shop guy came and told me that the dyno sucks, it really only gets you within 50 hp. Idk what to believe.

Want the experts opinion.

[YoungMT Hick]

i put mine on a dyno and i got 424/805 but thats with putting 31's on the truck and having the dyno have a hard time haveing our fords do a pull with the automatic. had trouble trying to stay in fourth

[Bad Night]

Dyno #s don't mean much . They should be looked at as tuning instruments only . That being said in an auto vehicle you should be in 3rd gear (in a 3 speed with o/d ) . If your vehicle is anything other than that it needs to be in whichever gear is 1 to 1 . In a 6 speed that is 4th . Dyno's are usually very accurate . The operate on very simple principles . It took x amount of time to turn x amount of weight to x speed . Torque is a calculated # . Gearing , tire size , and torque converters among other things can cause vehicles to have different readings . Usually more to do with torque numbers though .

[BIGGPIGG4x4]

I see. I was just thinking what I got was really low... My buddies truck with bulldog and exhaust hit 367 on 36s

[RescueF250]

In a 6.0 4th gear is not used. Shifts pattern is 1-2 2-3 3-5 -5-6, only time 4th is really actually used is when its really really cold. As for Dyno a 6.0 you need to pull in 5th. Right when you get under the turbo. There was a discussion on mine when I dynoed it. I believe Dockboy ( Dunbar's dyno ) dyno's 6.0 5R trans in 5th gear you should be hit the pedal at like 55 or 65 Im pretty sure thats how its suppose to be, once I buy another truck mine will go back on with a HOT file and hit the rollers the tranny will probably give at that point.

[RescueF250]

Here listen carefully to Shawn's run on the dyno you hear the turbo spool in 5th and the rest of the pull.

http://www.youtube.com/watch?v=u69EgznNdWo&feature=related

http://www.youtube.com/watch?v=u69EgznNdWo&feature=related

[BIGGPIGG4x4]

WOW... that truck is sick. So, basically my truck was dynoed in a gear that wasn't 1:1 so I lost a fraction of the power? Not only that it was dynoed in a gear that the truck rarely uses.

[BIGGPIGG4x4]

With that being said, what can I estimate my numbers to be? Since he did it in wrong gear? Higher/lower? 400-420hp? 700-720ft lbs? What's a more realistic number?

[Dave]

What tune did you dyno in?

[BIGGPIGG4x4]

SRL file from Gearhead Auto