dynoing...change tires or not?
 

i know we had a thread that discussed that there IS a difference with stock vs 35" tall tires on the dyno due to weight and diameter...

i am dynoing next saturday and im debating whether i should throw some stockers in the truck to put on when i get there or if i should just do it on the 35's...i want to see exactly what the truck is making, but i dont wanna be a ricer and "cheat" using the smaller tires to get a bigger number.

i already know my torque is gonna be way low with a decent hp number due to lack of boost before 2000rpms, but i wanna know exactly what the truck is making.

If you drive with 35s then test it that way. That is what it "REALLY" makes with those tires.

IMHO

hum, if you want an accurate reading, i would change them. or make 2 runs.

well its one or the other...because we have 40 trucks to dyno in one day and you get 3 runs and off the dyno for the next guy...

do it with the 35's. That way you know what you're really putting down.

Do the 35's so maybe I can match your #'s =P
I don't care how much hp my truck puts out if its more than GB's =P
Let me shut up before GB rolls in with 4 of those spare tire donuts on his truck [tapdshut] :o [laugh] [laugh]

Seriously though, I'd think the larger tires would help load the engine better and produce more boost- just a theory and not speaking from experience here [tapdshut]

sadly i can guarantee you will have more hp...hrvp and mach 4's with a much quicker spooling turbo...lucky SOB...i need to sell the 55 for a smaller turbo

You have a comp though. I have no wire tap. It'll be close I think.

i am trying to get a catcher ECM by saturday too...better watch out if i can get the 55 to light quicker :D

I say run the 35's. Your numbers will be lower, but they will be what you are really putting down...

Just as long as the pistons don't light too with double stacked timing =P

thats what im worried about...see my other thread...if its that risky i wont buy it

Dunno from experience- just having fun

I'd base the decision on what you are hoping to accomplish with the dyno session. Are you wanting to do better than someone else? Then the smaller rubber is the way to go.

If you want a more accurate measure of how you use the truck daily, use the 35s.

I'd personally do that latter, as I want to know what I *have*, not would I *could* have.

Heck, I *could* have more power with twins or nitrous or whatever, but that's not what I have now, is it...

does anybody know how much hp the 35's lose?