SPC Gearbox

The SPC box is a cracker, I`ve driven Tim`s old car which had one.
I`ll be ordering one with the same ratios as Vinnie for the new duratec powered Birkin. From what I`ve seen the quality of the boxes are superb too.

Vinnie did you get any extras like alloy case, cover or uprated internal bits and pieces?

Simon

>  from:    Nigel Marston <[email protected]>
>  date:    Tue, 28 Oct 2003 13:07:51
>  to:      [email protected]
>  subject: RE: [Sevens] 7 or 8 inches sir? (Or madam) :-)
> 
> > From: [email protected]
> > 
> > >Got an LSD yet?
> 
> > No, but thanks for your help. The one I tracked down (with
> > your help ta) looked a tad overpriced and I decided to hold
> > my horses. I'm not in a rush, I have all winter and to be
> > honest I'd rather spend 500 quid on a new Quaife ATB plus
> > fitting than the same (500)on a used Suretrac, which is
> > what was offered. I made a counter offer for the suretrac
> > btw which was rejected.
> 
> Oh well. If you get into a similar situation again, a used gear-type
> probably has negligible wear. They're supposed to run forever. That
> said, if the differential (pun intended) between a new and used one is
> less than 25% then you're probably right to withdraw.
>  
> > >Anxious to hear what you think of it as I recommended it.
> 
> > Yeah, I know and I am pretty sure its going to be a total
> > disaster. I have my litigation lawyer on stand by. BTW, thanks
> > for putting your confession in writing, we really needed that
> > for our case :-)))))))))
> 
> Someone's been spoofing my email addy again. Damn them.
>  
> > >Did you ever get the ratios? I'd like to run them through the
> > >gearing calc.
> 
> > Gear Ratio's SPC Semi helical box, 2.39, 1.54, 1.21, 1.00,
> > 0.87: I've run it through the calc prog a few times, (3.92
> > diff, 7750 red line) it all looks quite exciting with me
> > reaching squiglymillion miles an hour in first gear and then
> > up to severallyzillion in second.....:-)))Ooooh and did I
> > mention my new semi transparent flywheel :-)))
> 
> No. got a pic of the new flywheel? Have you resolved what clutch to fit?
> 
> Just thought I'd post the differences between the standard type-9 (2
> litre Sierra box) against your new one. "Interesting" doesn't cover it.
> "Superb" might. Hope Se7ens.net doesn't bugger up the formatting.
> 
> I've put 22 inch driven wheels in and then at the bottom (3rd chart) my
> own setup. Ignore the max power column. I'm interested by the
> similarities and differences like we both will hit 52mph in 1st at (our
> own) max revs and that we're within a hair of each others "potential"
> top speed.
> 
> This shows (to me) that you have an intelligently spaced set of ratios.
> You only have to compare it with the original box (chart 1) to see how
> silly the normal 5-speeder is in a Se7en.
> 
> Chart 1 - Original type-9 Sierra 2 litre
> Gear   Mph per 1000 RPM   Mph @7500 RPM   Mph @7750 RPM
> --------------------------------------------------------
>   1         4.57                34              35
>   2         8.48                64              66
>   3        12.19                91              94
>   4        16.70               125             129
>   5        20.36               153             158
> 
> 
> Chart 2 - Vinnie's new box
> Gear   Mph per 1000 RPM   Mph @7500 RPM   Mph @7750 RPM
> --------------------------------------------------------
>   1         6.99                52              54
>   2        10.84                81              84
>   3        13.80               103             107
>   4        16.70               125             129
>   5        19.19               144             149
> 
> Chart 3 - Caterham 6-speed with 3.62 diff/8000rpm rev limit
> Gear   Mph per 1000 RPM   Mph @7750 RPM   Mph @8000 RPM
> --------------------------------------------------------
>   1         6.72                52              54
>   2         9.00                70              72
>   3        11.37                88              91
>   4        13.70               106             110
>   5        16.00               124             128
>   6        18.08               140             145
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