front tire size worth in delay - Page 3

treessavoy · 07-28-2009, 12:11 PM

Quote:

Originally Posted by Ed Wright

Really?? First time I've heard or read this. The only National Dragster I have on hand right now has E-Town sportsman coverage. I averaged the Comp, SS and Stock elimination round reaction times. Comp had 8 red lights, average reaction time was .0675. (Wonder why Fletch and Biondo do so well there.) SS had 4 red, average reaction time was .0335, Stock had 3 red, average was .0448. The .90 classes, of course, killed us all. Should with all the crap they have on those cars. I can't see why foot brakers would have any advantage, from what I have seen S & SS are normally pretty close in that dept.

Yes, I forgot to add SS racers to the mix, my point is that "footbrake" racers work harder on their packages than electronics guys and most of the stockers and some SS'ers run tall tires. I run 29" moroso's and when in practice I have run O's and OO"s with them, so how does a tall tire hurt me vs a small tire?

Jim R

Ed Wright · 07-28-2009, 02:58 PM

Quote:

Originally Posted by treessavoy

Yes, I forgot to add SS racers to the mix, my point is that "footbrake" racers work harder on their packages than electronics guys and most of the stockers and some SS'ers run tall tires. I run 29" moroso's and when in practice I have run O's and OO"s with them, so how does a tall tire hurt me vs a small tire?

Jim R

I run the tallest I can get under mine. I have had several 00s, if your over .030 in SS at a div race around here your usually going home. Too many Emmons, Cumings, Helms, etc. I can't seem to get off Slate's side of the ladder. That kid kills the tree.

chevy620 · 07-29-2009, 08:16 AM

Lay a board in front of the tire and one behind it at say, 30 psi. Measure the distance between them. Lower air to 22 psi and do it again with boards. THat is change in physical roll out.
Go to the pits and ask some guys if you can measure that same thing on some different tires.

If I was looking for a solid .01 (which I was with Camaro) I would look for 1" to 1.5" wider gap in the boards. I went from tall Moroso to 26.5 M/T and it was about 1.5" at 26 psi. Haven't been red since but then again....I have been late a few times.

I still feel it is best to find a "spot" you like to leave at and you are consistent at, then work on the car to use that "spot".

A lot of guys on here have done this more than me but we are getting better every time out. I just keep running into guys who crush a .006 light and run the number...I know my day is coming, just have to keep working on it.

Good luck in your tire search.

Jok

racer913 · 08-12-2009, 01:02 PM

Quote:

Originally Posted by novanicks

In my experience, you will get exactly what you need in changing the tire. I would even suggest that it would be worth .010 and up to .020. Just make sure that if it makes you too slow that you have a way to add some reaction time back if needed.

Nick Shepherd

Thank you for your help

Jack McCarthy · 08-17-2009, 07:53 PM

careful there 442 darryl...i believe you are touching on performance enhancing drugs...

jack

dont forget the ET difference them big tires help with

Charlie Yannetti · 08-18-2009, 11:07 AM

I'm with Mark on this one.... but I am OL' SKOOL also.... drop RPM.... and/or drop tire pressure.... but as stated earlier, it will probably be a race to race thing as you get used to your changes.... I used to have a good crew guy who would make the changes without me knowing, and I would just do my normal thing.... worked great until I finally gave in to electronics.....

Everett Vassar · 08-19-2009, 11:01 AM

" still feel it is best to find a "spot" you like to leave at and you are consistent at, then work on the car to use that "spot"."

I agree wit this 100 percent L.E.D.s caused me to sell my Duster after 17yrs Used to footbrake with 13" front tires on the old bulbs.440 Dusters with fenderwell headers have major tire clearance issues and chassis headers will really slow them down and cause other issues. I had a new set of Hooker S/C,s (over $500) modified (another 300) to get a taller front tire.Still could only get 25" Still red lighting unless I sit on the bottom bulb.Then I was just terrible. I could have fixed it with a glide I guess at even more expense.I came on here and you guys helped all you could.-----heres how I addressed the problem--with a 81 Malibu wagon! Had to fix the motor and come up with some parts but its about 2-3 tenths away I look forward to the day I can slide the 28" tire on there if needed.

07-29-2009, 08:16 AM	#23
chevy620 Banned Join Date: Mar 2009 Posts: 188 Likes: 0 Liked 0 Times in 0 Posts	Re: front tire size worth in delay Lay a board in front of the tire and one behind it at say, 30 psi. Measure the distance between them. Lower air to 22 psi and do it again with boards. THat is change in physical roll out. Go to the pits and ask some guys if you can measure that same thing on some different tires. If I was looking for a solid .01 (which I was with Camaro) I would look for 1" to 1.5" wider gap in the boards. I went from tall Moroso to 26.5 M/T and it was about 1.5" at 26 psi. Haven't been red since but then again....I have been late a few times. I still feel it is best to find a "spot" you like to leave at and you are consistent at, then work on the car to use that "spot". A lot of guys on here have done this more than me but we are getting better every time out. I just keep running into guys who crush a .006 light and run the number...I know my day is coming, just have to keep working on it. Good luck in your tire search. Jok

08-17-2009, 07:53 PM	#25
Jack McCarthy VIP Member Join Date: Feb 2002 Location: lyndon ky. ... louisville area Posts: 1,322 Likes: 29 Liked 477 Times in 117 Posts	Re: front tire size worth in delay careful there 442 darryl...i believe you are touching on performance enhancing drugs... jack dont forget the ET difference them big tires help with __________________ Jack McCarthy 3609 STK "the Captain"

08-18-2009, 11:07 AM	#26
Charlie Yannetti Senior Member Join Date: Jan 2005 Location: Alpine, NJ Posts: 568 Likes: 188 Liked 192 Times in 83 Posts	Re: front tire size worth in delay I'm with Mark on this one.... but I am OL' SKOOL also.... drop RPM.... and/or drop tire pressure.... but as stated earlier, it will probably be a race to race thing as you get used to your changes.... I used to have a good crew guy who would make the changes without me knowing, and I would just do my normal thing.... worked great until I finally gave in to electronics.....

08-19-2009, 11:01 AM	#27
Everett Vassar Member Join Date: Jun 2004 Location: Kennedale,Tx Posts: 227 Likes: 0 Liked 2 Times in 2 Posts	Re: front tire size worth in delay " still feel it is best to find a "spot" you like to leave at and you are consistent at, then work on the car to use that "spot"." I agree wit this 100 percent L.E.D.s caused me to sell my Duster after 17yrs Used to footbrake with 13" front tires on the old bulbs.440 Dusters with fenderwell headers have major tire clearance issues and chassis headers will really slow them down and cause other issues. I had a new set of Hooker S/C,s (over $500) modified (another 300) to get a taller front tire.Still could only get 25" Still red lighting unless I sit on the bottom bulb.Then I was just terrible. I could have fixed it with a glide I guess at even more expense.I came on here and you guys helped all you could.-----heres how I addressed the problem--with a 81 Malibu wagon! Had to fix the motor and come up with some parts but its about 2-3 tenths away I look forward to the day I can slide the 28" tire on there if needed.