dave dumbar's dyno

[Don Tanklage]

curious what you all think about DAVID DUNBAR'S dyno



this is the dyno that goes to most of the diesel 'shows' and folks across the country use this dyno for comparison



what do you know about this dyno?



don tanklage

 

[TravisG]

I do not know David Dumbar, but I do know David Dunbar! Those guys are class acts. David will run your truck and get the best number possible out of it. He really knows his stuff.

 

[Don Tanklage]

David will run your truck and get the best number possible out of it.

do you think a turbo-charged engine will produce its best numbers on a enertia dyno?



what about a low rpm turbo diesel engine?



dt

 

[TravisG]

Oh Don you have just stirred up a whole mess of trouble with that question. I bet this is two pages long by the time I get home this evening. An inertia dyno is probably not the best way to get an accurate number but it does give you some sort of idea. Happy reading brother.

 

[2broke2smoke]

Those guys are class acts. David will run your truck and get the best number possible out of it. He really knows his stuff.

amen brother ...

seen dynos all over and his is the one i prefer ...

i've dyno'd with him three times and have two trucks waiting for him right now ... :-laf

 

[cerberusiam]

do you think a turbo-charged engine will produce its best numbers on a enertia dyno?



what about a low rpm turbo diesel engine?



dt

One word answer, NO. :-laf





The correction factors are incorrect most of the time also.

 

[bgilbert]

I prefer his dyno, the only 'official' dyno.

 

[Don Tanklage]

how much does he charge per hour?

 

[bgilbert]

At the dyno events it's usually $75 for three pulls, not by the hour. If you want dyno time, I suggest finding a local dyno to where you can tune. Then get it to where you think it makes the most HP, then bring it to a big diesel event for an 'official' HP number.

 

[Don Tanklage]

*



if you are going to use one dyno to measure and record 'official' numbers - shouldnt it be the most accurate type of dyno avail?





don tanklage

 

[Don Tanklage]

another dinosaur

nice... ... ... .

 

[Don Tanklage]

electric brake -

check this one out...

 

[cerberusiam]

then bring it to a big diesel event for an 'official' HP number.

(heavy sigh)











:-laf

 

[TWorline]

(heavy sigh)











Yeap, here we go.

 

[bgilbert]

he could buy a dynojet dyno for 2 weekends worth of work



i think it is way past time that he does...

I don't know what you're getting at, but his is a very nice dynojet dyno. 246 maybe? I've seen much 'wimpier' dynojets and this ain't it.



Besides if you're worried about the most precise hp measurements, pull your motor and take it to Scheid Diesel and have it dynoed on their engine dyno.

 

[Don Tanklage]

nothin wrong with a chassis dyno,



if it can load the motor effectively...





i watched the videos, dont think that is happening



don

 

[dpuckett]

Remember what MMiller says about the Cats when they dyno the semis? (says the bull wagons sound like airplanes) They run them up to the governed speed, then increase the load and keep loading it til the engine bogs, then load it some more, til they're down to almost idle speed. He also said that most of our engines would melt before the end of the run.



I have never dynoed any vehicle, except for CO emissions several years ago, but I think a load type would give accurate results for a low RPM engine- gas, diesel, or LP. I just dont see how you can load up the engine for a good torque number when the rollers are almost free-wheeling. I've read about guys who make 300hp with 31psi boost, but can hit 38psi empty on the street, and 42 towing heavy, telling me there is more power than is used on the dyno run. The inertia dynos would be easier on the tires, from what I have read.



Daniel

 

[2broke2smoke]

dyno'd 489 at fall brawl on an inertia dyno ...



then dyno'd 505-503-493 (three consecutive runs with the motor and transmission getting hotter and hotter) a month later on a load dyno ...



just dyno on both and post your results

 

[Don Tanklage]

tire slip will definately be an issue - it is on our 320 hp bikes (one 10" slick)



guess the price just went up for req equip



(forklift and a crate full of scrap iron?)

 

[MMiller]

I think the best method for bombed trucks is this. Find a dyno that has heavy enough rollers to get full boost, and then keep going back to that dyno to track changes.



I like load type dynos for diesels, but 99% of the trucks here would blow up long before a torque curve was made.



Michael