> any Vintage racing. I don't have an old GCR, but tell me were
Transmissions
> "OPEN" or weren't they restricted to stock boxes with C/R gears?
FWIW, and for comments: I pulled the following from my 1967 and 1972 GCR and
PCS books. If I'm reading this correctly, Close Ratio transmissions on the
TR series were not allowed in 1972 except on the TR6 range. My organization,
CVAR uses the 1972 books for all groups except the historic production
class, Group 4, which must follow 1967 rules. I AM NOT suggesting that
anyone should change what they are doing. You late Spitfire guys have some
nice choices!
1967 and 1972 GCR: The following modifications are authorized on all
Production Category cars, the ratios of the gear bos and rear axle when
listed by the SCCA (in the PCS). O/D allowed in all cars.
1967 AND 1972 PCS TR4-TR4A inc IRS
1 - 3.14
2 - 2.01
3 - 1.33
4 - 1.00
Final drives: 3.7, 4.1, 4.3, 4.55 IN 1972 THEY ADDED 4.875
1967 AND 1972 TR2-TR3B
Std.
1 - 3.38
2 - 2.00
3 - 1.32
4 - 1.00
Alternate
1 - 3.14
2 - 2.01
3 - 1.33
4 - 1.00
Final drives: 3.7, 4.1, 4.3, 4.55
1967 AND 1972 PCS Spitfire thru Mk2, ADDED Mk3 IN 1972 (same specs)
1 - 3.75
2 - 2.16
3 - 1.39
4 - 1.00
Alternate
1 - 2.93
2 - 1.78
3 - 1.25
4 - 1.00
Final drives: 4.11, 4.55, 4.88 (4.87 FOR MK3)
1972 PCS Spitfire Mk4
1 - 2.65
2 - 1.78
3 - 1.25
4 - 1.00
Alternate
1 - 2.93
2 - 1.78
3 - 1.25
4 - 1.00
Alternate
1 - 3.75
2 - 2.16
3 - 1.39
4 - 1.00
Final drives: 3.89, 3.20, 4.10, 4.55, 4.87
1972 PCS GT6 , GT6+, GT6 MK3
1 - 2.65
2 - 1.78
3 - 1.25
4 - 1.00
Alternate
1 - 1.80
2 - 1.49
3 - 1.20
4 - 1.00
Final drives: 3.27, 3.89, 4.10, 4.55, MK3: 3.2 INSTEAD OF 3.27
1972 PCS TR250 AND TR5
1 - 3.14
2 - 2.01
3 - 1.33
4 - 1.00
Final drives: 3.45, 3.7, 4.1, 4.3, 4.55, 4.87
1972 PCS TR6 (TWIN 1.75"), TR6 (FI)
Std.
1 - 3.14
2 - 2.01
3 - 1.33
4 - 1.00
Alternate
1 - 1.88
2 - 1.42
3 - 1.24
4 - 1.00
Final drives: 3.45, 3.7, 4.1, 4.3, 4.55, 4.87
Bob Kramer
TR4, TR4A, TR6, 2.5 Saloon
rgk@flash.net
----- Original Message -----
From: David & Krystal Wingett <elkhorn@megsinet.net>
To: Friend of Triumph <fot@autox.team.net>
Sent: Tuesday, December 05, 2000 4:15 PM
Subject: C/R Gear Boxes
> Gee, I've seen this thread before in the last year. For those
that
> have traveled the web you've probably already checked out the Close Ratio
> Dog Gear set on the Racetorations web page.
> I have been racing this type of gears for the past season and can
> only compare them with the Hewland MK9 trans in a F/C I once owned. I had
> originally inquired at Quaife about there C/R set and they turned me to
> Dennis. I had the TR6 Box built by Dennis Vessy in North Lincolnshire,
> England ( dennis.vessey@virgin.net ). Shipped to my door steep for around
> $3K.
> It has held up extremely well. The only mishap was when I used a
> badly worn shifter and it popped out of the socket on a down shift at Road
> America and locked between gears. That was the fourth race of a 10 race
> National season and the Runoffs. These are built proof and well suited
for
> any Vintage racing. I don't have an old GCR, but tell me were
Transmissions
> "OPEN" or weren't they restricted to stock boxes with C/R gears?
> In the next 4 year evolutionary cycle of my car I will have to
> decide between Ted's comp. Nissan, Jamie Houseman's Toyota , a Jerico or
> Dave Taylor's Sierra Quaife. BTW Taylor already has a complete set up for
a
> GT6 in his catalog.
> David W.
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