Drag Racing Discussions > Front Engine Dragsters

Change gears or tyres?

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retroboy:
Howdy
Long story short version I ran a basic small block Ford FED 35 years ago with 4.11's 28.5 tyre leaving at 3000 (clutch auto) about 6300 through the lights (1/4 mile) I went to a 30.5 tyre and it was a dog slow thing to drive. Now I have a basic 400ish HP small block Chrysler with 4.3's 31 tyre and a converter leaving with foot brake. I've only run it once 1/8 mile and hurt the motor and had no second gear so have no info. I've been thinking of going back to a 30" tyre  to help it off the line. Today I woke up thinking it would be cheaper to change to a 4.88 or so diff centre and leave the existing tyres and rim. Anyone changed gears rather than wheels and tyres?  This is an 1/8 mile car with a three speed trans (2.45:1 first gear) and 6500 it will be all out of breath. I haven't done the maths on the gears so don't shoot me down over that.
Cheers
Retro

masracingtd1167:
At 6500 rpm would put you around 123 mph .

retroboy:
Yep at about a mid 5 which should put me into the fun at these regional tracks. Just need to get a bit of help at the first half of the trackhence the question
.

digster:
Are you running an 8 3/4 Chrysler gear?

jeff/21:
 i prefer a low gear and tall  narrow tires we run 4.88 with 33x10.5 it all depends on the track conditions

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