John-
I have only a hoop, but it's braced fore and aft to the center section.
In addition, I have put diagonals everywhere in the frame, including
some removable ones under the transmission. I looked and couldn't find
the figures on my frame twist; I remember it being significantly
improved. The car's handling responds to changes well, which tells me
that stiffness is acceptable. As for torque, the engine has none,
coming on in the very high end with real power from 7000 to 9500rpm.
Final drive ratio is 5.38:1 turning 22" tires, so the high rev's are
useable at autocross speeds.
Parts for BDA's come mostly from Dave Bean Engineering, Cosworth, and
secret places only my engine builder knows. I suspect contacts in
Britain.
Hmm-forward holes for the steering rack? In mine, it caused the
steering arms to be angled much too far to the rear, maybe 20 degrees!
Bump steer was minimized by moving the rack vertically, not
horizontally. Could there be differences in frames???
Best,
Skip
Dr John Upham wrote:
>
> Skip,
> How much space frame twist is there with 230bhp (although the
> torque figure is more relevant)?
>
> I'd guess most of the twist is in the middle section but a decent
> roll cage should stiffen it up properly. I assume you do have
> a roll cage rather than just a roll hoop?
>
> Whilst I''ve been rebuilding my Vixen S3 I've bought an Impreza
> WRX which is quite amusing but not as much fun as the TVR.
>
> Where do you get your BDA parts from?
>
> Regards,
>
> John Upham
>
> Skip Gurnee wrote:
> >
> > Steve-
> > Dare I quote the old adage about "speed costs money how fast, etc.? The
> > money you spend will be somewhat dependent on your plans for the car and
> > how long you intend to keep it. If it's a lifelong venture like my
> > Vixen, then do whatever you want without regard to resale value. If you
> > have thoughts of selling it someday, then I second Bob's vote about
> > changing engines. I also second Will's thoughts about other
> > modifications required. My car is running a 230hp Cosworth BD engine,
> > and EVERYTHING has been changed in the suspension and drive train to
> > support it. The total cost is several times what you're considering.
> > The TVR can handle 175hp, but the drive train will see a large
> > percentage increase in stress, with consequent increase in breakage
> > possibilities. The mods on my car didn't come all at once; they came as
> > a result of fixing the "next weakest link".
> > By the way, the money and frustration are forgotten when the car stays
> > together and you win.
> > Best,
> > Skip Gurnee
> > 1970 Vixen S2 LVX14704
> >
> > "Hill, Stephen M EDUC:EX" wrote:
> > >
> > > I have been researching what can be done to warm up my stock TR6 engined
> > > 1972 TVR, which as folks know is only 106 hp stock. I have triple webers
>on
> > > it, a header, and I am acquiring pieces and info to go the rest of the
>way.
> > > The more research I do, the more I realise how difficult and expensive it
> > > will be to get a realiable 175 hp out of it, and I am wondering if I will
>be
> > > happy with that amount of hp. Perhaps I should go the Rover aluminum V8
> > > route, or maybe a late Ford 5.0 litre mustang setup. I figure if I dump
> > > $3000 into the TR6 engine and am not happy with the results, I will be
> > > pissed off. I am also starting to realise that the car would be worth more
> > > for resale with a V8 than with with a hot TR6 engine. Comments??
> > >
> > > Stephen
> > > 1972 2500 TVR
>
>
>
> --
> Dr John Upham, The UKMotorSport Index,
> http://www.ukmotorsport.com/, webmaster@ukmotorsport.com,
> Voice: +44 (0) 976 634 053 (W), Voice: +44 (0) 125 287 2551 (H),
> Voice: +44 (0) 976 634 053 (M)
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