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glang
April 12, 2017, 7:03pm Report to Moderator

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Guess Triumph got it wrong then but they even put the 3.89 in the lighter more aerodynamic GT6 with o/d.....
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cliftyhanger
April 12, 2017, 7:44pm Report to Moderator

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Quite possibly!
And to add to that the non od GT6 had the 3.27, which works just fine even when od is added.
Especially when you se the enev lighter and less powerful/torquey 1500 spit had the 3.63

But then again people didn't do long distances or the speeds that we expect today.


Clive Senior

Location-Brighton, East Sussex
Foxy is here, 1500od tax exempt Toledo. Now has the decent engine back in Slant 4 engine bolted in, sprint box and axle.Now has fresh MoT. Needs paint though.
Spitfire Zetec project is started work progressing slooooowly on the road!
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Nick Jones
April 12, 2017, 8:13pm Report to Moderator

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Most of the pre-70s Triumphs were horribly under-geared.  Notable exceptions being the TRs, 2.5 PI and non-OD GT6.

It's true - roads were slower and opportunities to hold more than 60mph were quite limited.

Nick


Nick Jones
Somerset UK

Vitesse Mk 1.5 Convertible EFI, Survivor of RBRR 2008, HCR & 10CR 2009, HCR 2010, 10CR2011, HCR 2012, 10CR2013, 10CR2015, HCR 2016 & HCR 2017.
GT6 Mk3 Roto - project in progress
Spitfire MKIV son's project now on the road as a daily driver
2.5 PI Saloon now EFI (PIe?), Engine rebuilt and running sweet.  Diff howling...... Survivor of HCR 2013 & 2014 Gone to live in Swansea

http://www.tengaston.plus.com
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bobbster
April 12, 2017, 8:22pm Report to Moderator

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What diff was put into a mk 2 vitesse as standard with an over drive box
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glang
April 12, 2017, 8:23pm Report to Moderator

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Ha I must be stuck in the 60s then as 60mph is good for me n the Vitesse - it just feels right and I get to keep almost modern acceleration
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glang
April 12, 2017, 8:24pm Report to Moderator

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They all had 3.89 Bobbster
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bobbster
April 12, 2017, 9:58pm Report to Moderator

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Thanks for that's it gives me good idea on what I need
Cheers Nigel
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glang
April 13, 2017, 12:23pm Report to Moderator

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Nigel just remembered a couple of other things:
Im running 165/80 X 13 tyres which does make the 3.89 diff a little bit taller. This gives a small speedo error which of course would be even greater with a change of diff ratio. To correct this you need to either recalibrate the speedo or change the speedo drive gears in the gearbox....
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herald948
April 13, 2017, 4:10pm Report to Moderator


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Quoted from glang
Nigel just remembered a couple of other things:
Im running 165/80 X 13 tyres which does make the 3.89 diff a little bit taller. This gives a small speedo error which of course would be even greater with a change of diff ratio. To correct this you need to either recalibrate the speedo or change the speedo drive gears in the gearbox....
If your experience is anything like mine over the years, you just might find that your once optimistic speedometer is now a bit closer to accurate with the 165/80R13 tires, assuming that they're actually that much larger in diameter than the OE tires were.



--Andy Mace

*Mrs Irrelevant: Oh, is it a jet?
*Man: Well, no ... It's not so much of a jet, it's more your, er, Triumph Herald engine with wings.
-- Cut-price Airlines Sketch, Monty Python's Flying Circus (22)
http://triumph-herald.us
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glang
April 13, 2017, 7:05pm Report to Moderator

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According to the interweb changing from the original 155/80 X 13 tyres gives a speedo error of 2.6% while a 3.63 diff almost 7%. Ive never checked my speedo accuracy and your right as I believe their permitted tolerance was 10% so these changes might actually make an improvement....
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RobPearce
April 19, 2017, 11:10am Report to Moderator

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I've certainly had speedos that were rather more than 10% optimistic in the past. Surprisingly, my GT6's speedo appears to be spot on - which is to say it was 5% low when it had a 4.11 diff and is now about 7% high because I've fitted a 3.63


Current fleet
1967 Vitesse 2L conv "Tessa"
1970 Spitfire Mk3 (project) "Toby"
1972 GT6 Mk3
Not enough time or space
Recently sold:
1972 2.5 PI estate "Harry" (gone to russell on here)
1973 Toledo 2-door "Spike" (gone to a club official)
Used to have:
1968 Vitesse 2L saloon
1980 Dolomite 1500
1977 Dolomite 1850
1980 Dolomite Sprint
1982 TR7 DHC Sprint
1975 2500S saloon
1971 Herald 13/60 Estate (with 1500 Spit engine)
1975 Stag
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