What Tire to run

herbjr · 11-04-2008, 09:25 AM

What tire would you run on a Modified Type car running 5.80 at 3000lbs. Its a small block automatic.

Herb Jr

Dave Goob Cook · 11-04-2008, 11:08 AM

Probably a M/T 14-32 stiff sidewall.

buzzinhalfdozen · 11-04-2008, 08:35 PM

Herb I agree with Dave on this My car is 2960# and with a " normal" tire without the stiff side wall it wants to run over the tire unless we ran the pressure way up 11-12 psi. Next year I will be trying Radials for the first time however when I get new bias plys they will be with the stiff sidewall. For reference 9.75 et @ 2970lbs. 7500 rpm chip 8100 rpm stall converter. Hope this helps Joe Buchanan SS/AX SS/BX 3117

buzzinhalfdozen · 11-05-2008, 08:59 AM

Ray, My new car is an auto. trans. Joe Buchanan

herbjr · 11-05-2008, 09:26 AM

347 in motor, 5.67 gear, 8800 rpm....3 speed, oh yea its a dodge. It ran 5.90's. its a legal bore and stroke 340 for ihra production ss but will run c/m or bs. on nhra side. car is 3100lbs now in ihra trim.

Herb Jr

buzzinhalfdozen · 11-05-2008, 08:06 PM

Ray, shift 9300-9400 no air shifter yet cross finish line 9700-9800 falls back to converter obviously on shift. Only have maybe 8 runs on car mainly trying to get an idea of what converter I'll need as well as trans ratio, first gear is 2.45 I believe haven't had chance to try other trans yet. To be honest this auto trans took me e few runs to get used to shifting it, stick seemed easier, I actually used to shift my 5- speed set up at 9700-9800 however had more drop between gears. Not sure if I need to run engine higher between shifts or not as I don't really have a lot of info yet on this set up. Thanks Joe Sorry Ray just looked at my data logger shift rpm is correct but finish line is 9350 seems to be still pulling strong, 6.50 gear 101 roll tire, believe I need to go with less roll tire. Joe

buzzinhalfdozen · 11-06-2008, 06:42 PM

Ray off topic do you run an even or odd fire engine? I have the stuff to do an even fire but man looking at the even fire crank scares me. Joe

11-04-2008, 09:25 AM	#1
herbjr VIP Member Join Date: Apr 2005 Location: Greensboro NC Posts: 1,027 Likes: 1 Liked 83 Times in 32 Posts	What Tire to run What tire would you run on a Modified Type car running 5.80 at 3000lbs. Its a small block automatic. Herb Jr

11-04-2008, 11:08 AM	#2
Dave Goob Cook Member Join Date: Dec 2006 Location: Indy Posts: 422 Likes: 0 Liked 0 Times in 0 Posts	Re: What Tire to run Probably a M/T 14-32 stiff sidewall. __________________ "Despite the high cost of living, it remains popular." Dave Cook NHRA N375

11-04-2008, 08:35 PM	#3
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	Re: What Tire to run Herb I agree with Dave on this My car is 2960# and with a " normal" tire without the stiff side wall it wants to run over the tire unless we ran the pressure way up 11-12 psi. Next year I will be trying Radials for the first time however when I get new bias plys they will be with the stiff sidewall. For reference 9.75 et @ 2970lbs. 7500 rpm chip 8100 rpm stall converter. Hope this helps Joe Buchanan SS/AX SS/BX 3117

11-05-2008, 08:59 AM	#4
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	Re: What Tire to run Ray, My new car is an auto. trans. Joe Buchanan

11-05-2008, 09:26 AM	#5
herbjr VIP Member Join Date: Apr 2005 Location: Greensboro NC Posts: 1,027 Likes: 1 Liked 83 Times in 32 Posts	Re: What Tire to run 347 in motor, 5.67 gear, 8800 rpm....3 speed, oh yea its a dodge. It ran 5.90's. its a legal bore and stroke 340 for ihra production ss but will run c/m or bs. on nhra side. car is 3100lbs now in ihra trim. Herb Jr

11-05-2008, 08:06 PM	#6
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	Re: What Tire to run Ray, shift 9300-9400 no air shifter yet cross finish line 9700-9800 falls back to converter obviously on shift. Only have maybe 8 runs on car mainly trying to get an idea of what converter I'll need as well as trans ratio, first gear is 2.45 I believe haven't had chance to try other trans yet. To be honest this auto trans took me e few runs to get used to shifting it, stick seemed easier, I actually used to shift my 5- speed set up at 9700-9800 however had more drop between gears. Not sure if I need to run engine higher between shifts or not as I don't really have a lot of info yet on this set up. Thanks Joe Sorry Ray just looked at my data logger shift rpm is correct but finish line is 9350 seems to be still pulling strong, 6.50 gear 101 roll tire, believe I need to go with less roll tire. Joe Last edited by buzzinhalfdozen; 11-05-2008 at 08:20 PM.

11-06-2008, 06:42 PM	#7
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	Re: What Tire to run Ray off topic do you run an even or odd fire engine? I have the stuff to do an even fire but man looking at the even fire crank scares me. Joe