Competition May Madness Dyno #'s

[Bob Wagner]

Richard and Crew did a great job at at May Madness and DHRA Nationals.



Why do we always need to look for a negative?





Thanks for a great job Maddog

 

[JR2]

Well. .

I guess then it would be easier to answer this with a question to you...



IF the majority of the trucks weight is left hanging downhill where the weight load is ALL carried by the front tires and not distributed evenly,do you think the HP numbers can be elevated also?... ... . Andy

What in the world does equal weight distribution have to do with the HP an engine makes and how that is transferd to a the rear wheels. If we use your logic then my truck would make more hp/tq going down hill??

 

[Hammer]

Why do we always need to look for a negative?

Bob. .

IT is NOT,repeat,NOT a negative question. It is however,as one who runs dyno shows,a question so that we can be on the "same page" as the rest of the country. I feel this is a valid question and not a negative.

What in the world does equal weight distribution have to do with the HP an engine makes and how that is transferd to a the rear wheels. If we use your logic then my truck would make more hp/tq going down hill??

JR2...

Here is a fact plain and simple for your thoughts...

IF you take a truck and lower the front below the rear,thus taking all or most all of the weight off the rear wouldn't you think it would aid in in spoolup?. It should give you a number which would may different than one which is sitting a a even ride height level on the dyno and has the weight distributed evenly on the trucks 4 corners.



Again. .

I am not crying fowl,not sreaming wolf,nor complaining about any of the numbers made. Numbers are numbers,all I am trying to do is find out IF anyone knows an answer to a simple question and not cause anyone any heartburn... ... . Andy

 

[LaserBob]

I think that the direction of the lever in a torque application is of no consequence. If you hang a 2# weight on the end of your torque wrench, do you get a different result?

 

[Doubleclutch]

Andy, as you probably know, the "DYNO" is a stupid tool that only knows one thing... how fast does it take to spool up a given weight to a given speed. That's it. No more. The computer looks at the "Rate of change" during that speed up, and prints out a pretty graph. That's extra credit. If the truck was strapped to the dyno upside down, it's going to read out. It won't read out as much... . BECAUSE THERE WON'T BE AS MUCH FRICTION ON THE ROLLERS. And I think this is where your arguement starts to fall apart. When you tie the truck down with about 80% of it's weight on the front axel,(because you have to with this portable dyno). You handicap yourself, because you tend to have less load on the rear wheels, and potentially less friction to accelerate the rollers. At least, that's my take.

Greg

 

[KLockliear]

Greg hit it pretty close. The limiting factor by having the front not raised would only be the lack of weight on the rear axle allowing for traction. How fast the drums spin up is a factor of power only, not direction of travel or weight applied to the tires. Weight on the tires only helps the tires gain traction on the drum surface.

And yes, I HAVE tested cars and trucks in the up and down positions of mobile Dynojet dynos.

 

[MForbus]

Bgilbert, there was a sweet 1st gen there run by a 19 year-old girl from Reno, a white extra-cab. I think she dynoed at around 165, I believe it was stock.

I have the first gen you are talking about. My truck did 195hp. Its pretty much stock exept for the fuel turned up a little.

 

[MADDOG2]

Ok...

I have a question here... .



WHY was the dyno left with the nose in the downward position and not leveled off to allow the weight of the truck to be on the dyno?. Dynoing with the ramp down in the front is no different than sitting the rear of the truck on a pair of jackstands and dynoing,freewheeling city.



This is not to make a mockery of anyones power made or their numbers,but,if you desire all of us(those who participate at dyno shows across the country)then please at least give us all the same consideration Mr. Donnelly once asked us all for.



There is a advantage to dynoing like this and alot of those other members who go to outside shows use in ground dynos and can not cheat like this... . Andy

Andy, I am not going to waste much time on this post so I will tell you straight up, it dosen't make any difference in dyno numbers if the lift is up or down. I have tried it on several different trucks from low horsepower to high horsepower. Did you ever stop to realize how much downward force is applied to the axle when four big straps are cinched down tight? So quess what there is no advantage to dynoing like this. Someone always from the East coast looking for an excuse. :-{}

 

[BPonci]

Maddog, have you ever been on a superflow dyno? The ones that i have ran on seem to load the vehicle much more aggresive that others. I wonder if the #s would be the same? congrats to all the competitors for the high #s

 

[Hammer]

And yes, I HAVE tested cars and trucks in the up and down positions of mobile Dynojet dynos.

Keith. .

Thank You for answering the question which I had,I do appreciate it.

Someone always from the East coast looking for an excuse.

Richard. .

I used to look upon you and what you did with respect and after a answer to me like that I will not make that mistake again. It was a honest question,with no excuses given,stated or implied. Since most of us in other parts of the country have to roll on stationary jets where the load(what little one gains by that)is on the rear tires I just wanted to know IF there was any noted difference.



As one who trys to run our clubs shows and goes to shows outside the realm of this site,I try to make sure we all are on the same page so numbers can be compared across the board. I implied no East vs West confrontation,all I wanted was a answer to a very easy question,one which you could have answered with better taste since you do own a jet like this.



Personally,

I could care less what you think of anyones numbers or where they are made or what reason they had for making what they did. What you should care about is trying to help those who want to keep abreast of whats going on to try and better their shows... ... ... ... . Andy

 

[bgilbert]

As much as I'd like to take a shot at west coast numbers, I have to agree with Greg and Keith. If anything, it seems with less weight on the rear, would just mean less load on the rear, less HP. How many times have you seen a couple 300 pound guys sitting in the back of someone's truck on a dyno trying to get it to load a little more.

 

[Allnew2Me]

Hey Melissa, sorry about stealing 30 HP from you! I enjoyed talking with you about your truck and your dogs. Hope to see you again sometime, have fun.

 

[KLockliear]

As much as I'd like to take a shot at west coast numbers, I have to agree with Greg and Keith. If anything, it seems with less weight on the rear, would just mean less load on the rear, less HP. How many times have you seen a couple 300 pound guys sitting in the back of someone's truck on a dyno trying to get it to load a little more.

The guys sitting in the back are to add weight to the tires where they contact the drum for better traction. Has nothing to do with the rotational inertia of the dyno or the load the truck is under.



You typically see these feats when running a Mustang or similar twin-roller dyno, since they can't hold the power as well as the large single roller dyno like a Dynojet.

 

[MADDOG2]

Ok...

I have a question here... .



WHY was the dyno left with the nose in the downward position and not leveled off to allow the weight of the truck to be on the dyno?. Dynoing with the ramp down in the front is no different than sitting the rear of the truck on a pair of jackstands and dynoing,freewheeling city.



This is not to make a mockery of anyones power made or their numbers,but,if you desire all of us(those who participate at dyno shows across the country)then please at least give us all the same consideration Mr. Donnelly once asked us all for.



There is a advantage to dynoing like this and alot of those other members who go to outside shows use in ground dynos and can not cheat like this... . Andy

Keith. .

Thank You for answering the question which I had,I do appreciate it.







Richard. .

I used to look upon you and what you did with respect and after a answer to me like that I will not make that mistake again. It was a honest question,with no excuses given,stated or implied. Since most of us in other parts of the country have to roll on stationary jets where the load(what little one gains by that)is on the rear tires I just wanted to know IF there was any noted difference.



As one who trys to run our clubs shows and goes to shows outside the realm of this site,I try to make sure we all are on the same page so numbers can be compared across the board. I implied no East vs West confrontation,all I wanted was a answer to a very easy question,one which you could have answered with better taste since you do own a jet like this.



Personally,

I could care less what you think of anyones numbers or where they are made or what reason they had for making what they did. What you should care about is trying to help those who want to keep abreast of whats going on to try and better their shows... ... ... ... . Andy

Andy, Talk about the pot calling the Kettle black. Your first question was fine, but then you made these statments as if you already knew the answer.



"Dynoing with the ramp down in the front is no different than sitting the rear of the truck on a pair of jackstands and dynoing,freewheeling city. "



You are not asking a question there but stating your opinion as if you know what is going on.



And this one is a real beauty.



"There is a advantage to dynoing like this and alot of those other members who go to outside shows use in ground dynos and can not cheat like this"



Once again you are not asking a question, but plainly stating your opinion as to what you think has taken place. So in a nut shell you said we cheated right????



I don't think I will lose much sleep over this.



"Richard. .

I used to look upon you and what you did with respect and after a answer to me like that I will not make that mistake again. "



Oh and this one is a real winner.



"It was a honest question,with no excuses given,stated or implied. "



Yes your first and only question was an honest one, but after that you kind of let your opinions get in the way wouldn't you say?



Have a great day Andy.

 

[JR2]

My truck does go faster when going downhill... ... ... .

 

[Joseph Donnelly]

You don't change "load" with the truck on an uphill or downhill, or with people/weight in the bed. You can improve traction on the roller with more weight on the roller. The way Richard strapped the trucks, there was most likely no advantage or disadvantage. The ramp was left down for convenience only. If there was any negative effect, the 1200 hp trucks could have had trouble getting full traction. They spun up the roller very fast, sounded like under a second. Don't bring a butter knife to that gun fight Three trucks over 1100 hp, a first for any dyno event I know about.