Please never use our slicks on a (DYNO) unless you have @ least 20-25 pounds of air in them. What happens is when you strap down the car in the front, you are putting pressure down on the Slicks and you will break down the Sidewall and that is the most important part of the Slick.( I recommend you do not use them on a DYNO).

Don't Bag me on this one, because I see what most racers don't see thats why I am here, is to HELP.

This is your HIGH TECH ? for the month, Thank You for listening. John@M&H-Hashim's

 

good info, thanks

 

I have always wondered if the diameter of the tire played a part in wheel hp? IE:13 steelies against my 24x9's lol sorry just some drunk ramblings.

 

or those 13" tires at 50 psi to reduce rolling resistance......

 

what about our old slicks right before we are buying new ones from you ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by littlebluecrx &raquo;</TD></TR><TR><TD CLASS="quote">what about our old slicks right before we are buying new ones from you ?</TD></TR></TABLE>

yeah ...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by littlebluecrx &raquo;</TD></TR><TR><TD CLASS="quote">what about our old slicks right before we are buying new ones from you ?</TD></TR></TABLE>

lol yeah john, you should be encouraging them to run on slick........ j/k

nick

 

Thanks for the info John!

Corey

 

 

Good info.

Higher psi in your tires would yeild better dyno numbers anyways, right?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RyanCivic2000 &raquo;</TD></TR><TR><TD CLASS="quote">Good info.

Higher psi in your tires would yeild better dyno numbers anyways, right?</TD></TR></TABLE>

we actually discussed this briefly at the East Coast tuning Seminar. Ben said that tires will NOT make any differance (or no real notable one) Dyno's generally work on the principal of how fast you can excelorate the rollers, and tires will not affect the readings by much, if at all.

perhaps Mr. EFI himself can shed some more light on the subject...

 

I use my old "throw away" slicks 22" on the dyno simply because I break the street tires loose and the slicks hold a lot better. But I do inflate them to 30 psi. Good info though.

 

Hey Guys,

What i was saying about tire size was that the tire diameter acts as a gear ratio...........taller tires = higher ratio, and shorter tires = shorter gear ratio.

When using a chassis dyno, the effect of gear ratios is cancelled out because the engine makes how ever much torque it is going to make and that is not affected by gearing or tire size.

Since horsepower is technically defined as work/time it follows that as the gearing changes, the power at the tires will remain constant {neglecting any small parasitic differences}

In other words, a shorter gear ratio {or tire diameter} will effectively produce more torque at the wheel, but at the cost of wheel speed.

In this case the torque is "work" and wheel speed is "time".

So as the amount of torque is varied by gear ratio, the wheel speed is varied in direct proportion so that the two effects cancel each other out.

This explains why a car will make nearly the same power when tested in each gear, the only difference being a slight change in parasitic loss and possibly traction.

 

like always john giving us great info.

 

On inertia type dynos, I used to run passes in 4th gear, with tall street tires, to get a longer pull, and more resolution.

Now I only dyno on DynoDynamics setups (which have load control). And on these dyno's we have no traction issues, so we just use street tires. We keep an eye on tire pressure, just to aviod any little variables.

We have a set of wheels and street tires just for when we get on the dyno. I've always avoided making dyno pulls on slicks.

Oh another reason I run on this dyno, I can make pulls from a dead stop, starting in 3rd gear!.
We've compared runs in different gears, and the graphs lay right on top of each other.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ProfessorNate &raquo;</TD></TR><TR><TD CLASS="quote">
We've compared runs in different gears, and the graphs lay right on top of each other.</TD></TR></TABLE>

Thanks for helping make my point Nate! That's what I was saying.......regardless of gear or tire size, the engine still makes the same power!

DynoDynamics RULES!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Drag R &raquo;</TD></TR><TR><TD CLASS="quote">

lol yeah john, you should be encouraging them to run on slick........ j/k

nick</TD></TR></TABLE>

I am just trying to save you guy's $ and your slicks. John@M&H-Hashim's

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SlicksMH &raquo;</TD></TR><TR><TD CLASS="quote">

I am just trying to save you guy's $ and your slicks. John@M&H-Hashim's</TD></TR></TABLE>

Maybe even save a life/car. The weaker sidewalls might fail sooner......

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mista Bone &raquo;</TD></TR><TR><TD CLASS="quote">

Maybe even save a life/car. The weaker sidewalls might fail sooner......</TD></TR></TABLE>

Yes you are right, Good Job (Mista Bone) John@M&H-Hashim's

 

and those little hot ***** of rubber also hurt as they fly off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by speedworks &raquo;</TD></TR><TR><TD CLASS="quote">and those little hot ***** of rubber also hurt as they fly off. </TD></TR></TABLE>
WOW, you would have to get the M&H's pretty hot to do that. lol John@M&H-Hashim's

 

they were mickey thompsons. they were also killed when i got finished on the dyno. slicks and a dyno=wore out slicks.

 

The only time I have seen a M&H Slick ball up is because they are spinnnnnnnnnning them. John@M&H-Hashim's

 

i was going to say, the only time i would see the need for slicks on the dyno is because your spinning your street tires

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiRkid &raquo;</TD></TR><TR><TD CLASS="quote">i was going to say, the only time i would see the need for slicks on the dyno is because your spinning your street tires </TD></TR></TABLE>

If you do, please bump the air pressure up. John@M&H-Hashim's