Competition Dumb Dyno Question.....

[Timbeaux38]

If an engine dynos say 500 hp @ 2700 rpm on any type dyno, is it making 500 only at WOT under a load, or any time the engine is at 2700? Like I said, dumb question... . I just want the "experts" to chime in.....

 

[chrleb1]

it is making 500 hp at WOT under load. If you were to do a dyno run at half throttle and hit the same rpm, you will not register 500 hp. If you were to put the truck into neutral and take it to 2700, you will not be making 500 hp. As the you increase the load on the motor, the turbo starts to kick in and you start to fuel harder and then your hp increases.

 

[Timbeaux38]

pretty much what I had figured... . I think

 

[JVolpe]

MY dumb dyno question

I ask before what is the best method to dyno a diesel with a 48re. The answer seem to be get to OD and Lockup and then WOT to red line.



That produced reasonable numbers. This was on a DynoJet dyno and it just doesnt seem like you get enough load to really spool the turbo all the way up fast enough. Would it matter if the turbo spooled quicker with a load or just change when the max HP is reached?



This was the second time I have been at a perfomance shop for a dyno day that did not have what they needed to record Torque on a diesel. They said we just double the HP for Torque estimate.



They have a Mustang that was tied up that day. Is it worth while to do some pulls on a Mustang that can be loaded some. Will I get more accurate numbers?



Well that is more than my share of dumb questions.



Thanks in advance.

 

[SRadke]

If you have a large laggy single turbocharger combined with a fueling box that doesn't add fuel until it monitors boost levels starting to climb than yes, a pull in OD or on a Mustang dyno will provide more accurate numbers as to how it performs. On a truck with a smaller quick spooling tubo or twins with a small secondary an inertia dyno will give very accuarte numbers.



-Scott

 

[JVolpe]

Thanks,



The numbers were consistent with what I have added. So if OD pull on the DynoJet is reasonably correct, then I wont worry about it.



HO600 with air intake, Banks muffler and Juice/Attitude Level 5(100hp) was 360HP, stock mine what about 270HP.