Max Width of wheel on Grantura mk 2a?
Discussion
To try and answer you question regarding racing - "what are the regs" that all depends upon what series or championship you intend to race in.
For FiA racing to Appendix K the wheel rims are specified within the homologation papers. If you are racing in a club series or championship then you would have to refer to their specific rules. If a wheel rim width is allowed within the series regs but physically won't fit in the wheelarch you would then have to refer to the regs concerning bodywork to see if you are allowed to flare the arches.
Sorry but your question is really too open to answer directly. Fundamentally you can run whatever is allowed by regulations and you can fit within those regulations.
For FiA racing to Appendix K the wheel rims are specified within the homologation papers. If you are racing in a club series or championship then you would have to refer to their specific rules. If a wheel rim width is allowed within the series regs but physically won't fit in the wheelarch you would then have to refer to the regs concerning bodywork to see if you are allowed to flare the arches.
Sorry but your question is really too open to answer directly. Fundamentally you can run whatever is allowed by regulations and you can fit within those regulations.
The MkIII was homologated with 5J and 6J - 5.5J therefore not legal for FIA. I think the car in question though is a MkIIa and I don't have access to the FIA papers so can't comment on what is legal for FIA on that marque. Basically you need to do some research into what you want to do first. I agree with Jelly that 6J will fit a MkIII wheel arch (just and with some very careful offset calculations). However the MKIIa is a Beetle sspension car isn't it so take all this with a pinch of salt!
Yes Beetle Suspension, sounds better if you say 'suspension similar to the Porsche 356 don't you know'. I am used to double wishbone susp, with other cars I have had, which handled well, so I think it might be a case for brown trousers with bicycle clips with this one.
Where would I find out what is FIA homolgamated on a mk2a?
Where would I find out what is FIA homolgamated on a mk2a?
Granny Fan said:
Yes Beetle Suspension, sounds better if you say 'suspension similar to the Porsche 356 don't you know'. I am used to double wishbone susp, with other cars I have had, which handled well, so I think it might be a case for brown trousers with bicycle clips with this one.
Where would I find out what is FIA homolgamated on a mk2a?
Maybe Ian Massey Cross? PM me and I'll give you his email.Where would I find out what is FIA homolgamated on a mk2a?
My first car was a Beetle - ok but hardly cutting edge suspension (maybe when Adolf was about). 3000M next
Do you mean the back is those long blade type things? If so how is that in corporated into a TVR spaceframe? Or are you meaning the front?
Pic's?
Those "long blade type things" are called torsion bars. The front and rear suspension of all pre Grantura Mk3 cars was based on VW torsion bar suspension. Crude but effective in good condition but obviously has its limitations since the trailing arms are only "supported" in one place. Given the limitations imposed by this layout the maximum width of tyre is irrelevant, more what width will work with the suspension. The torsion bars in themelves are not a problem, after all a coil spring is also a torsion bar, just wound into a coil rather than a collection of laminates clamped in the middle.
Remember by going wider on wheel and tyre you are considerably increasing the weight acting on the trailing arm bush and the faster you go the more the effect. In poor condition or over stressed the car will effectively steer from both ends. Sometimes less grip is more.
Remember by going wider on wheel and tyre you are considerably increasing the weight acting on the trailing arm bush and the faster you go the more the effect. In poor condition or over stressed the car will effectively steer from both ends. Sometimes less grip is more.
My first car was a Beetle also, 6V rust bucket, but fond memories, bought for the sum of 25 quid.
I digress, http://tvrgrantura.blogspot.com/ has pic's of torsion bar susp.
Will pm you for that email address jellison, thanks.
In your experience, What dampers do you recommend for road/race?
I digress, http://tvrgrantura.blogspot.com/ has pic's of torsion bar susp.
Will pm you for that email address jellison, thanks.
In your experience, What dampers do you recommend for road/race?
thegamekeeper said:
Those "long blade type things" are called torsion bars. The front and rear suspension of all pre Grantura Mk3 cars was based on VW torsion bar suspension. Crude but effective in good condition but obviously has its limitations since the trailing arms are only "supported" in one place. Given the limitations imposed by this layout the maximum width of tyre is irrelevant, more what width will work with the suspension. The torsion bars in themelves are not a problem, after all a coil spring is also a torsion bar, just wound into a coil rather than a collection of laminates clamped in the middle.
Oooh Please for give me! 
I'll pass on recommending spings.
I was thinking of the hideous rear trailing arms on a Beetles rear (Eek).
I see the Granny 2 has Beetle front setup on the front and rear. NICE Pic BTW
davegt6 said:
That suspension just looks scary to me! I guess it is fine in good condition on a road car though.
Jelly - not sure where I'll be racing this season but testing at Goodwood next Friday and will be at Spa SC and 6Hr events then fill in the dots inbetween!
Reading an old MSport last knight BRM V16 had much the same front suspension as the Granny Mk2!Jelly - not sure where I'll be racing this season but testing at Goodwood next Friday and will be at Spa SC and 6Hr events then fill in the dots inbetween!
Is this a proper test or an invite track day - went along to one there last year about this time (passenger though) great day out - Enjoy.
See you at SPA.
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