With a Clutch Tamer your clutch should be tunable enough that it will work.
Tire diameter only plays a part in starting line ratio in that a taller tire with the same trap RPM then you can run a lower rear axle ratio (higher numerically) which increases the SLR.
If you can’t drop the rear axle ratio (higher numerically) the you need to find a 2.66 or better yet a 3.09 box. That the best improvement you can make to your SLR.
If you can’t find a complete 3.09 box, you can call Brewers and buy the gears and cluster gears. It’s easy working on 4 speeds.
To make a 4 (or 5) speed car move you need the correct SLR and you NEED to be able to tune the clutch.
A 9 or 10 or even an 11:1 SLR is pretty low. I’m at 15:1 and for my car that’s a bit low, but like you I can’t tolerate any more gear.
In fact, I went to a 28 inch tire so I could take out the 4.56’s and use 4.88’s.
I needed the SLR and in my opinion, a 4.56 is the last of the street/strip gears for cars that can’t get a 28 inch tall tire in there.
That allowed me to go from a 14:1 SLR to 15:1 and being the freak I am, I wanted that point of SLR. Because it matters.
If it sounds like I’m a bit fired up it’s because when I started doing this in 1979 and back then no one would open their mouths to help.
Back then, the clutch people I was using were morons. Now I use Advanced Clutches or Black Magic clutches.
I don’t dick with anyone else any more. Tim Hyatt was a clutch guru but he died and I think at some point his son took over. If that is the case I’d assume he’s as good as his dad was.
If you are talking to anyone, and I don’t give a jack screw if it’s Bob Glidden or Warren Johnson and they say “you have to SLIP the clutch turn and RUN AWAY.
They don’t have a clue as to what they are talking about. I know BG and WJ would NEVER make such an ignorant statement, but I wanted to make a point.
Listening to rail birds and converter guys is just wasting your time.
That’s the fact. The controlled APLICATION of the clutch is the deal. You have to do it.
Dealing with my dad today but later I’ll post the video I referenced earlier as a lesson in how to do it exactly wrong.
What you will learn in that video will change the way you think about clutches and how they actually work when trying to go fast. Or at least have fun.