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Old January 29th, 2012, 06:10 PM   #181
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tires are heavier, may slip on the rollers less than slicks or a smaller size tire. yes they do make a difference on the dyno. It may not be a lot but hell numbers is numbers right.
Horse power is horse power, tire size shouldn't matter spinning a calibrated drum. Dyno results are always corrected to sea level. To make a proper dyno run, specs need to be imputed into the dyno. They want to know tire size and gearing so that the dyno can compensate for each setup.

Changing gears will increase the amount of torque multiplication. Dyno results are base on torque then hp is calculated from the results. Putting in the lower gear then increasing the tire size will still give the same amount of torque but the mph should be higher because of the taller tire.

Not all dynos are the same. Getting a dyno run at one shop then getting another the next day at another dyno can give different results.
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Old January 29th, 2012, 06:18 PM   #182
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I agree but a taller heavier tire that can and may slip to being bigger and heavier will rob torque which is hp in the end. A smaller tire that hooks will hold the drum much better, that is what I was getting at. Giving a more accurate evaluation.
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Old January 29th, 2012, 07:53 PM   #183
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enough dyno talk. is this thing jumping shit yet.
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Old January 29th, 2012, 08:07 PM   #184
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It was a good weekend at the shop. We are in good shape with the week coming up. There's a few things on the list, but anybody that's been around Mike before a race knows he will always find something to work on up until you shoot him or start the race.





When I left this evening, the stuff on the have to do list was front limit straps, engine/trans/t-case breathers, window nets, passenger seat belts, two panels were done but needed final fitting, install sway bar, winch ropes, tire hold-down, fiberglass/lexan skins, install skid, and I'm sure a few other items.

As for the dyno numbers -- who cares. Sure, it'd be nice if they were higher, but the important part is the tune chased out a few gremlins from last year and the engine should not hurt itself.
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Old January 29th, 2012, 09:07 PM   #185
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I agree but a taller heavier tire that can and may slip to being bigger and heavier will rob torque which is hp in the end. A smaller tire that hooks will hold the drum much better, that is what I was getting at. Giving a more accurate evaluation.
true...but his larger/heavier tires are offset by his gear ratio
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Old January 29th, 2012, 09:38 PM   #186
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As for the dyno numbers -- who cares. Sure, it'd be nice if they were higher, but the important part is the tune chased out a few gremlins from last year and the engine should not hurt itself.
so I take it nobody won the hat huh?
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Old January 30th, 2012, 12:48 AM   #187
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. Putting in the lower gear then increasing the tire size will still give the same amount of torque but the mph should be higher because of the taller tire.

.

oh really
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Old January 30th, 2012, 04:28 AM   #188
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Old January 30th, 2012, 07:55 AM   #189
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It was a good weekend at the shop. We are in good shape with the week coming up. There's a few things on the list, but anybody that's been around Mike before a race knows he will always find something to work on up until you shoot him or start the race.





When I left this evening, the stuff on the have to do list was front limit straps, engine/trans/t-case breathers, window nets, passenger seat belts, two panels were done but needed final fitting, install sway bar, winch ropes, tire hold-down, fiberglass/lexan skins, install skid, and I'm sure a few other items.

As for the dyno numbers -- who cares. Sure, it'd be nice if they were higher, but the important part is the tune chased out a few gremlins from last year and the engine should not hurt itself.
The car is looking good, wish I could've came up and helped. That is a long 8hrs of driving if I can't put in a whole weekend or at least a whole day. See you guys on the lake bed if I survive my trip from Vegas in an RV full of Aussie's!!!
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Old January 30th, 2012, 08:37 AM   #190
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Quote:
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true...but his larger/heavier tires are offset by his gear ratio
here is an example from when I ran mud bogs. 39.5" bogger/rim combo weighing in at 145 ea. thats 290 lbs of rotating mass, when I ran comp class I ran a 36" super scoop that had 3" scoops on them making them 39" and the rim/tire weighed in at 78 lbs ea. 156 lbs rotating mass thats 134 lbs lighter in the rear for rotational mass when running the lighter tires. It lit those tires quicker with no bottle than it did the heavier combo with the same gear ratio. Free horse power because of the less rotational mass.

I guess my humor above in the first post was taken wrong I am out trying to discuss this. I have made serious horse power for years and ran all different sizes of tires. Mike has a ripping machine period and I speak to take nothing away from that!
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Old January 30th, 2012, 09:30 AM   #191
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oh really
yes lawn cutter, care to prove me wrong
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Old January 30th, 2012, 11:05 AM   #192
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So....that was a train wreck for a few pages while i was working on the car. All i know is pulling in 2nd gear spins a whole lot more crap than spinning in 3rd gear and that will change numbers...

233 HP (not corrected)

Lets call it 273HP (add 40 since it was a 2nd gear pull)....whos closest to 273? PM me your address or come by the shop for your shirt!
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Old January 30th, 2012, 11:08 AM   #193
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BBAXJ said 276 thats pretty close not sure if anyone else was closer.
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Old January 30th, 2012, 11:09 AM   #194
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yup...i think hes the weiner.
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Old January 30th, 2012, 11:12 AM   #195
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i will take his hat as trade for my fence that he ran his jeep in to
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Old January 30th, 2012, 12:00 PM   #196
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Quote:
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So....that was a train wreck for a few pages while i was working on the car. All i know is pulling in 2nd gear spins a whole lot more crap than spinning in 3rd gear and that will change numbers...

233 HP (not corrected)

Lets call it 273HP (add 40 since it was a 2nd gear pull)....whos closest to 273? PM me your address or come by the shop for your shirt!
I think you should add 50, of course. Since I said 275/305 .

Good luck at the race!!
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Old January 30th, 2012, 12:10 PM   #197
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yup...i think hes the weiner.
I've been wanting to come and see the beast anyway....should I just stop by one evening? I imagine at this point you're out there anytime you're awake and not at work.

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i will take his hat as trade for my fence that he ran his jeep in to

I didn't even do any damage!!!

....did I? The lawn on the other hand, I messed that all up pulling out the minivan

Quote:
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here is an example from when I ran mud bogs. 39.5" bogger/rim combo weighing in at 145 ea. thats 290 lbs of rotating mass, when I ran comp class I ran a 36" super scoop that had 3" scoops on them making them 39" and the rim/tire weighed in at 78 lbs ea. 156 lbs rotating mass thats 134 lbs lighter in the rear for rotational mass when running the lighter tires. It lit those tires quicker with no bottle than it did the heavier combo with the same gear ratio. Free horse power because of the less rotational mass.

I guess my humor above in the first post was taken wrong I am out trying to discuss this. I have made serious horse power for years and ran all different sizes of tires. Mike has a ripping machine period and I speak to take nothing away from that!
Even beyond the weight of the rotating parts, I've heard time and again that tread compound and air pressure can make big differences too. With sticky tires and relatively low pressures I'm sure the numbers were lower because of that too. Basically everything that makes Mike's buggy awesome offroad makes it terrible for making impressive numbers on the dyno, no matter how fast or powerful it really is.

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Old January 30th, 2012, 12:24 PM   #198
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any night after 8pm except tonight. I have a night off!!!!
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Old January 30th, 2012, 12:25 PM   #199
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I believe a wider tire will also add more rolling resistance. Hence why a bicycle rider uses skinny tires on road bikes. Pretty scientific eh?
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Old January 30th, 2012, 12:35 PM   #200
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any night after 8pm except tonight. I have a night off!!!!
Good for you!! (and probably your wife and kids)

I'll probably come by either tomorrow or Thursday....not just for free shit, I haven't seen the rig or most of you guys in quite a while
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