Competition Dynoed the BBD today

[BigBadDodge]

Well help me out here fellers, I don't know Jack about Dyno's other then that the Mustang is supposed to be better because you can load it. I dynoed on a local dyno-jet last Monday and pulled 421 rwhp in valet mode out of valet mode with aux fuel I got 577 rwhp. there were some obvious signs that the truck wasn't even working hard like let me see, only 54psi of boost, 910 ftlbs of torque, and only 950 on egt's. of course I wasn't satisfied so today I took it to a mustang Dyno at Ken Imlers Diesel in Sacto, nothing was done to the truck since last Monday. well any way we got 419rwhp in valet mode and out of valet with the aux fuel we got 629. 9 rwhp. I was much more satisfied with the Mustang dyno results, Ken loaded it I believe to 8,000lbs does this make sense ? what do you load the diesels too ? also I only made 60psi boost on that 629 run what gives ? when I left his place I stabbed it getting on the highway, broiled the 36" x 14. 5 tires through fourth gear and hit 67 psi. Does my 4:10 gears and 36" tires rob alot of the power ? as mentioned I am satisfied with the results but wonder what they would be if I had stock tires and different gears. I prolly won't dyno again anytime soon I was doing this for a feature article in magazine due out in December.



Educate me on the art of dyno tuning, and interpreting the results ole mighty dyno kings out there.



BBD

 

[cjohnson]

Can't give you much input on your dyno reports, but your numbers on the mustang sound strong. Nice job. I have heard people talking about the advantages and disadvantages of the two. Seems some have had trouble getting the numbers out of some of the twinned trucks on the dynojets. But then there is the issue of tire slippage on the loading dynos. Like I said, I know I'm not much help there. I'm just looking forward to seeing your truck at Tulare this weekend.



Again, nice numbers.



Craig

 

[willyslover]

big tires and low gear is a detrament to HP #'s as they do not allow turbos to spool up. . twins even worse with low gears... put on stock tires and maybe 5th gear and you might see a bunch more... ? worth looking at... but the mustang is better at loading. . so maybe not much change...



IMHO the 630 # you have is about right / in the ball parkwith 370's and large tires

 

[Sled Puller]

What model Mustang? Single roller or double?

 

[big jake 1]

Originally posted by BigBadDodge

Well help me out here fellers, I don't know Jack about Dyno's other then that the Mustang is supposed to be better because you can load it. I dynoed on a local dyno-jet last Monday and pulled 421 rwhp in valet mode out of valet mode with aux fuel I got 577 rwhp. there were some obvious signs that the truck wasn't even working hard like let me see, only 54psi of boost, 910 ftlbs of torque, and only 950 on egt's. of course I wasn't satisfied so today I took it to a mustang Dyno at Ken Imlers Diesel in Sacto, nothing was done to the truck since last Monday. well any way we got 419rwhp in valet mode and out of valet with the aux fuel we got 629. 9 rwhp. I was much more satisfied with the Mustang dyno results, Ken loaded it I believe to 8,000lbs does this make sense ? what do you load the diesels too ? also I only made 60psi boost on that 629 run what gives ? when I left his place I stabbed it getting on the highway, broiled the 36" x 14. 5 tires through fourth gear and hit 67 psi. Does my 4:10 gears and 36" tires rob alot of the power ? as mentioned I am satisfied with the results but wonder what they would be if I had stock tires and different gears. I prolly won't dyno again anytime soon I was doing this for a feature article in magazine due out in December.



Educate me on the art of dyno tuning, and interpreting the results ole mighty dyno kings out there.



BBD

I can throw a rock from my house and hit Ken Imlers's place





I have made over 800 rwhp on that dyno... ... ... ... ...





and only using the front license plate... .....





see you in Tulare









big jake



THE FORD GUY Oo. Oo. Oo.

 

[Briar Hopper]

Piers has a Dyno Dynamics, it's similiar to a Mustang dyno, it loads enough, without traction loss, to spool up the twins fairly well. Jason Burton has spent more time on that dyno than I have, it'd be interesting to see his comments on boost numbers, on & off the dyno.

By the way, that's the same kind of dyno we'll have at our pull this weekend, Oct. 11.

I'm no expert on the dyno's, but I doubt any of them will load enough to hit max boost. Correct me if I'm wrong.

DavidTD has a trailer-mounted dynojet, I really like the numbers on his machine, they are very, very close to my numbers on Scheid's Mustang dyno, and on the Dyno Dynamics.

And Scott, congrats on the high numbers, looking forward to the magazine article!

 

[BigBadDodge]

Thanks guy's



Gene, Double rollers



BBD

 

[Idaho CTD]

BBD,



Double rollers per tire? If so that is pretty impressive. Typically double roller mustangs have a hard time holding traction over about 450-500hp. How low were you "launching" at rpm's wise? What gear were you using? I agree with Gary that your tires and gears are hurting you for hp numbers on a dyno. About a 255/285 size tire will be better for numbers due to lower rotational mass but still some load due to the 33" height. You also lose some load with the 4. 10's. Good numbers though.



Nathan

 

[DavidTD]

The debate goes on...



I would be surprised if you didn't get a higher number loading the truck but I would expect the torque number to differ more than the HP. As I told Briar this weekend, a couple of weekends ago we had a two day event with a Mustang and Dyno Jet side by side. On Saturday the Mustang was putting out lower numbers than the Dyno Jet, on Sunday it was putting out higher numbers. We put one of our trucks on the Mustang dyno Saturday which has a ton of runs on my dynojet @ 420 - 435 hp. His best run was 380 on the Mustang. They said they changed some settings for Sunday to make it more accurate??? I don't like that. I can't change settings on the dynojet. You get what you get, period. If you can change settings that change the output, then who really knows what is accurate?



It is true the dyno Jet is tougher to spool on, but for me, this is a good indication of how well your set-up is working. I see many sets of twins pass 80 PSI on my dyno. I also see some struggle to get 50 psi. I can pre-load the turbo's with the brakes and in some trucks I see a little better number, others I don't, but mostly the torque is what changes.



This past weekend I had a few folks that did not see what they expected, most others did. In this game though, most want the big number, whether it is correct or not.



Briar hit 499. 6 on my dyno and 501 on the Dyno Dynamic's. (Correct me Tom if I am wrong here on the Dyno Dynamic's number) and his truck felt good and strong on the dyno.



So there is my opinion, not worth much, but there it is.

 

[Sled Puller]

Originally posted by DavidTD

In this game though, most want the big number, whether it is correct or not.

LOL! Yep, you are right, it is a BIG game!



David, How many times have you heard someone grumble as they walk away from your dyno, "That dyno is reading low. "



But I bet you have NEVER heard, "That dyno is reading high. "





When I get on a dyno, I want to know excatly what my engine is making that day. Don't care about correction factors, or anything else, I want the truth.



But until I find one that I can take it to 4000 rpm, and let the dyno pull it down, I will never know!



Anyway, it doesn't really matter, becuase dynos are just another excuse for us to get together, and exchange insults.

Right, Jetpilot?

 

[Jetpilot]

From what I have tried if you are using a double roller mustang you can help with the tire slippage by strapping the rear axle both forward and back wards to get a good bind on the tires against the rollers.



Dyno's are nothing more than tuning tools..... They are good indicator as to how a modification is working. But in order for this to be accurate one needs to make the testing as constant as possible. Jumping between dynos brands/models really doesn't do this. For me I use the same dyno for all my testing. The dyno guys and I have talked and they feel that if a vehicle is making within 5% of what has been peak HP then nothing is wrong with the motor. So what does this mean, well I try and dyno prior to a mod and get the HP reading. Make the change at the dyno shop and re-dyno. This way I know for sure the truck is running correct and what #'s to use for the comparison.



Another thing to take into account is correction factors..... Correction factors for altitude really are pretty useless for our trucks. By using turbo's we create the atmosphere within the engine unlike a normally aspirated engine. This is the same concept used by airplanes, by turbo charging the engine they are able to maintain sea level atmosphere to a much higher altitude. Therefore HP is constant to a given altitude, now at some altitude the turbo's are unable to maintain this rating and HP drops off but this is usually at least 8000-10000 feet MSL.



Gene is right with his statement of "But I bet you have NEVER heard, "That dyno is reading high. " Most guys feel that a dyno # can manipulated and the operator didn't run it good enough to spool their turbos. I can tell ya that it doesn't make much if any difference riding the brakes. But what it does do by riding them is to take out a constant from the equation. Can the operator release the brakes at exactly the same point/load every run?



Also as Gene said without dynos when would he and I get together to grumble insults back and forth from under our hoods and have to peek around to see if the other one heard! :-laf



BBD



The 4. 10 gears really don't hurt the HP readings but they do seem to hurt the TQ readings..... As for the tires it has been my experience that the taller tires usually hurt HP about 5-10 HP but help TQ by an equal amount.



Doug

 

[gitchesum]

Originally posted by Sled Puller

But I bet you have NEVER heard, "That dyno is reading high. "

I've never made that statement, but I was happy one time when the dyno was supposedly reading low. Everyone was talking about how low the dyno was reading, I was quite pleased with my measly little 405 HP. Who know what it would have been if the dyno would have been "reading right"



Of course, we were dynoing with the Ford guys and they only had one truck over 400HP. The Dodge guys only had one truck under 400HP. :-laf

 

[Diesel Freak]

Originally posted by Sled Puller



David, How many times have you heard someone grumble as they walk away from your dyno.



But I bet you have NEVER heard, "That dyno is reading high. "

LMAO, I have said this, and heard people grumble in the background after I get off the dyno!



:-laf

 

[Briar Hopper]

David, you got the numbers right . No biggie, I'm more concerned about where the truck is on the track than on paper, but your dyno has proven more than once to be a big tuning help to me... Many thanks for that, and your valuable input !

Had a great time last weekend, as always, with you and Penny.

Doug is correct, it's most valuable as a tuning tool, but dyno events are fun anyway. Some people are always new to diesel performance, and watching them go is pretty funny.....

 

[DavidTD]

I think there is one thing we all can agree on. Nothing is more impressive and fun than to see a diesel truck puke black smoke as the tires wrinkle on the rollers. I look forward to every diesel event I do especially after running those imports over and over...

 

[HVAC]

Biggly Baddly Dodge

I still got ya Scott!



Hey, if you don't want to dyno at RPM let me know. I'm investigating a dyno facility in San Ramon. Need to do lots of testing, so I'm hoping it will serve the purpose cause it's so much closer to me.



Scott, what's up with Adam?



Opps, possibly most importantly, are you going to be at Tulare???

I'd really like to see your rig on the pulling track

 

[cjohnson]

Hey HVAC, does this mean you are going to Tulare? I thought you were planning to go to Phoenix. Would be cool to see you if you are planning to make it now. Hope to see you in a few. From what I have read, BBD is planning on making it.





Craig

 

[BigBadDodge]

Oh yeah, wouldn't miss it, the dodge boyz will be laying the "smack down" on the Furds and Chebys



Nowell, I haven't talked to Adam since the Ukia pull, I believe he was headed for the Clements pull and had some problems then had to turn around. Hope he gets her figured out soon.



I will be in Tulare Friday evening.



See ya all then.



BBD

 

[Brandon]

tulare... ... .....

 

[HVAC]

Tulare

Craig, I'm still unsure of my schedule. I was supposed to be in Phoenix racing but my granny is expected to be released from the convalescent hospital on Sunday. I'll need to be there, so no Phoenix:{ %#@$& Not positive I'll be able to do the Tulare thing Would be cool



Biggest Baddest Dodge, hope I get to watch ya pull Saturday. I'm just hope all the fame and world wide recognition hasn't changed ya too much