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Post by DaveRv8 on Apr 16, 2017 11:59:18 GMT
Ok I have to own up...I think I've made a mistake with my tyres, but I'm puzzled...
I'm using Toyo T1R's (which seem ok) in 205 45 15. The trouble is I can't match times I set using my old 205 65 15 Bridgestones.
I had assumed that the better grip in the corners and off the line would make up for the reduction in gearing. So at Harewood and Curborough, where I spend quite a bit of time on the rev limiter in 2nd, I was a second or so slower than my previous best.
I have no previous experience of either sprints/hillclimbs or MGBs so had little to go on.
And we're restricted to list 1A tyres
I know its a competition but I'm pondering what to do so thought I would see if there is any wisdom out there to tap in to?
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Post by username1 on Apr 16, 2017 21:22:34 GMT
Well I'm no expert on B's but 45s seem to be very low profile for an old car. I know the RV8 has more modern suspension than the original B but generally older cars don't like ultra low profile tyres. I've heard that the Toyos are a good choice but again I'm no expert on 1b tyres.
On the subject of gearing it's always difficult to get it right and it probably never will be! I lowered the gearing on my car and it is now great pulling out of tight bends but there are a few places now where 2nd is too low and 3rd is too high!!
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Post by DaveRv8 on Apr 20, 2017 19:47:02 GMT
Hmmm..I thought it might be something like that. I guess a live axle and cart springs don't provide the best camber control for low, stiff sidewall tyres. I'm stuck with the gearing really as there was only one gearbox/axle combo on the RV8.
Oh well back to the drawing board I suppose...its a shame there isn't more opportunity to practice and experiment.
Must try harder!
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Post by username1 on Apr 20, 2017 21:51:22 GMT
At least with the RV8 you should be able to quickly shred your tyres ready to try another set! Could get expensive though!!
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Post by projectshed on Apr 25, 2017 9:56:44 GMT
Personally not a great fan of Toyos - the T1R is overrated IMO. The best 1A tyre I every used was the Bridgestone S-02, but they're long gone.
Sorry, can't recommend a better tyre as I am more familiar with the F and not sure what would work best with the RV8 suspension?
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Post by DaveRv8 on Apr 27, 2017 19:54:34 GMT
Yes I liked the SO2s when I had them on my 944, replaced them with Pirelli P zeros but they weren't as good... Then I had Toyo R888s which I really liked but they're not 1A so thought I'd try the T1Rs. I guess the RV8 is more like an MGC (15" wheels) and people seem to think they work better with 55 or 60 profile tyres so I'll have to see how I get on at Shelsley. I would really like a chance to do some testing so might try & fit in a track day.
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Post by projectshed on Apr 28, 2017 14:37:32 GMT
Sounds like a good plan! :-)
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Post by DaveRv8 on May 1, 2017 10:36:58 GMT
Going to sprint school...see if I can improve the driver!...more to go at I expect...
BTW if you think T1R's are overrated what current List 1A tyres do you think are better & why?
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