Tire height change from 26" to 28"

[tford]

With stock gearing and stock trans keeping it in D, at what point (mph wise) do most of you need to change tire height to avoid excessive rpms in the 1/4 mile? My next question is how much speed is gained on average when switching from a 26" tall tire to a 28" tall tire? I'm thinking a change to a 28" tire will gain me about 10 mph and knock half a second off my time. Am I way off on this? I know everyone has different setups so results will be slightly different but I just wanted to here from people that have went through this growing pain. Thanks.

 

[1KWIK6]

There are a lot of variables that come into play here. Generally speaking, I would switch to 28” tires when you have the power to run 115+ mph in the quarter with a stock-ish cam.

 

[Pronto]

12 flat on 235 drag radials. Went straight to pits put on a set of 275s and went 11.7. Stock engine with bolt ons and stock rear gears.

 

[grass doctor]

like 1kwik6 said many variables to consider, but typically with out changing anything but tire size only a 4-5 MPH gain overall

 

[tford]

Ok. Thanks guys. Tire height is some of my issue but I think my converter is way too loose. Thinking of dropping the stall from 3200 to 2800 and running Daves converter to wake this beast up. It is screaming for mercy @ 6000+ by the end of the 1/4 right now. Any thoughts on the possible changes?