Drag Racing Discussions > Front Engine Dragsters

Rear Tire selection

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up in smoke:
great feedback for us rookies just listening in. I am also a newbie with 6 passes and I am also saddled with the question of what tire, what launch rpm, tranny brake or no-tranny brake,,,ready to hear as much input as possible thanks

codysisson:
Jon, Thank you for the great feedback! The 7800 Stall converter was a 7", I now have a 9.25" converter that was recommended to me. The fellow who does the converters is in Texas, I am trying to get the name from my transmission guy.

What compound do you recommend for the Good Years? I also want o get another set of rims. I have a set of 10" Sander rims now but I want to have another set of mounted tires for back up. Where do you recommend I buy a set?

Oh I forgot to mention like you pointed out Jon, The MT's are very heavy compared to my Hoosiers!!

George:
Compare the weights of the tires and it's clear. The 2585 is designed as a light weight grow tire .

dreracecar:
FYI---Tires that come in a group that includes .5 numbers for tread are mostly door car super classes and do not grow whereas solid numbers are comp tires and do grow, plus they tend to GET-UP on the tire quicker

JrFuel Hayden:
Cody, I think you should try your friends 12" GY, and if they work better call me, 805-444-4489 I'll put you on the list for D2585, & I recommend starting with your 10" rims at 6 lbs of pressure, and go down on pressure [ 5.75 - 5.5] if you are hooking up too much, and want more tire speed, and up if you want more traction [6.25-6.5].
I wonder if your 9.5" converter is too big, the only FED car I know that is using a 9.5 is a blown alky late Hemi A/FD, and he's making at least double the HP you are. My guess is your 9.5 will pull your motor down below your HP range. A good idea is ask your engine and/ or cam guy to find out your RPM range, and get your converter to work in that range. As an example, if your motor starts making power at 5000, but your converter stalls at 4000, your combo will struggle for 1000 rpm. The biggest increase in our JrFueler came when we changed converters. When you change to a bigger cam and/or more compression, you may have to change your converter stall [ flash point]. Which means you may not have to get another converter, just have a converter guy change the stator. I have changed at least 4 stators, after changing my motor combo's ie cam, heads, compression. 

Jon

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