2003 Dyno Results

[Big MAK]

I dynoed at 255hp and 470 lb/ft



I think the dyno was reading out a little low; but would be consistent with other read-outs under similar conditions. I think I would probably dyno in the low to mid 260s.



Expecting 10-20% for drivetrain loss with a stock engine those results are about right (255).



KC Dyno Day:

https://www.turbodieselregister.com/user_gallery/displayalbum.php?&albumid=499

 

[yogibear]

Mine made 249. 7hp and 459. 4lb/ft



It scales out at 9200lbs full of fuel and me in it, the spare tank was full, 130gal. and 1/2 full stock tank, so probably was weighting 9000lbs. so they were close Mark.



Larry

 

[Big MAK]

It was great meeting you Larry. See you at another get-together sometime I'm sure! Let's see who stays stock.

 

[Mark_Kendrick]

Those numbers sound about right (255-260) for an HO. A stock auto only makes about 230.



A BOMBed auto does SUBSTANTIALLY BETTER

(over double that)

Those new commonrails are gonne really be awesome when a few toys hit the market.

 

[Roger rodbolt]

Tough truck

Mark,

I regret that I didn't get the chance to meet you at KC and didn't even know which truck was yours until I checked your pics. You have a great looking truck (awesome color) and I commented just that as it was pulled from the dyno. Good luck with it, Larry

 

[Prairie Dog]

I was up at BD's Dyno day's and one of the tech's (Pat) confirmed what I had long suspected about chassis dyno's - intercooled engines cant be accurately dynoed because the charge air cooler cant do it's job when the truck is standing still. So 255 to 260 HP for a 305 HP rated truck is about right.

 

[chessie-system]

Howdy,

Isn't that why they put a HUGE fan facing the front of the truck and open the hood during testing



Jeff

 

[nickleinonen]

how about the big @ss fan blowing at the IC and a water cooling jet system setup on the truck to spray down the IC with a cold water mist. . hmm... [oh no... . i started thinking again... ]

 

[Mark_Kendrick]

The fan doesn't blow 90+mph air over the radiator.

 

[Roger rodbolt]

My intake temps were not a factor on Sunday. Even on a 1300rpm to 3500 rpm run in overdrive, my airhorn temperature stayed below interstate cruise temps. I attribute this both to their highflow fan and the short duration of the dynojet test. I am curious as to the duration of the run for the stock trucks. I would guess that some on the fast spooling trucks completed the dyno run in three seconds? Mine ran from 4 seconds on the BD injectors to 6. 64 secs. on the experimentals. Highest recorded egt was 917 on the smokers. Larry

 

[Fireman]

Mark,



Wind chill diminishes considerally above 40 mph, it isn't linear.



Fireman

 

[Mark_Kendrick]

The air being forced through the radiator on the road makes a huge difference in the cooling systems ability to shed heat.



No fan set in front of the radiator is going to equate to the air forced through the radiator by movement of the vehicle.

 

[Roger rodbolt]

Fireman and Mark, I think you are both absolutely correct in your statements. My point is that inlet temps were not a horsepower diminishing factor on Sunday. I will say that my Horton fan will make a huge difference when it is engaged but with the cool ambient temps, short duration run, low dyno loading and the Adequate airflow from the shops squirrel-cage fan there was no need for it on Sunday. . Larry

 

[Big MAK]

Roger; 1600 to 3300 in 4. 30; 4. 34; 4. 37 seconds. Didn't you get your best results with the BDs in the 4 second range? It would be interesting to reconcile power output with response time and RPMs over that time under different configurations; but then that's what you're doing huh?

 

[Roger rodbolt]

Big MAK,

Yes, several of the smaller turbo'd trucks seemed to have short runs and it's interesting to compare. Of course gear ratio, tires and transmission's have an affect too. With the experimental injectors in direct drive (5th on my 6speed), 3. 54's and 295/75-16's it went 1600 to 3300 in 3. 90. The same in overdrive took 6. 64 and 6. 37. The tach only recorded to 3300rpm on one run with the BD 8's, time was 4. 73 in overdrive. I wish I would have gotten a good reading in direct. Which gear were you quoting? Thanks, Larry



BTW: With the low hp exp. injectors I got a 1500 to 3500 run in 4. 86... ... . dropped 138hp and 220ftlbs. between 3400 and 3500rpm!!!!

 

[Big MAK]

All my runs were in 5th (6spd).