Richard B Posted May 22, 2012 Share Posted May 22, 2012 339 wrote:Laurencei haven't ever driven a GT6 with a triumph gearbox so I was guessing, to a degree, at the mph per 1000rpm. I stand corrected on the ratio :B :B In a Triumph box 4th is 1 to 1. with O/D adding an extra gear.Presumably in a Type 9 4th is also 1 - 1 with 5th being comparable to O/D?One for James Carruthers to add to his spreadsheet? Link to comment Share on other sites More sharing options...
Nick Jones Posted May 22, 2012 Share Posted May 22, 2012 Richard_B wrote:In a Triumph box 4th is 1 to 1. with O/D adding an extra gear.Presumably in a Type 9 4th is also 1 - 1 with 5th being comparable to O/D?One for James Carruthers to add to his spreadsheet? Yep, 4th in T9 is 1:1 and 5th is 0.82:1This compares with OD which is 0.8:1 (actually D type 0.802 and J-type 0.797) or 5th on a Toyota W58 at 0.78:1. And yes, I know there is another variant of the J-type which is taller but I can't find the number just now......Nick Link to comment Share on other sites More sharing options...
James Posted May 22, 2012 Share Posted May 22, 2012 Richard_B wrote:In a Triumph box 4th is 1 to 1. with O/D adding an extra gear.Presumably in a Type 9 4th is also 1 - 1 with 5th being comparable to O/D?One for James Carruthers to add to his spreadsheet? It's only for Triumphs :) Link to comment Share on other sites More sharing options...
TimW Posted May 22, 2012 Share Posted May 22, 2012 bobyspit wrote:My 3.63 with Type 9 gearbox was returning 70 mph at 3250-3300 rpm so Tim may of had a 3.89?Well I ordered and was charged for a 3.63 but that was from Jigsaw so it could be anything!!! Link to comment Share on other sites More sharing options...
Bradley1500 Posted May 22, 2012 Author Share Posted May 22, 2012 I'm confused.So, Tim you're running a 3.63 diff not the 3.27? This means the ratios will be fine with the 3.63 and the type 9.It's the 3.89 that doesn't work well with a type 9? and the 3.27 that blows up eventually with a type 9 and a bit of power?Bradley. Link to comment Share on other sites More sharing options...
GT6 M Posted May 22, 2012 Share Posted May 22, 2012 Ahhh, but did ye change the speedo Link to comment Share on other sites More sharing options...
Richard B Posted May 23, 2012 Share Posted May 23, 2012 jcarruthers wrote:It's only for Triumphs :)Not kit cars ;D Link to comment Share on other sites More sharing options...
TimW Posted May 23, 2012 Share Posted May 23, 2012 4992 wrote:I'm confused.So, Tim you're running a 3.63 diff not the 3.27? This means the ratios will be fine with the 3.63 and the type 9.It's the 3.89 that doesn't work well with a type 9? and the 3.27 that blows up eventually with a type 9 and a bit of power?Bradley.No Bradley I was running a 3.63 but now i run a 3.27. This is why i said not to use a 3.63 with the type 9. The 3.27 is holding on just fine after doing the Ten countries run last year and a RBRR in a spitfire the year before that and whatever AndyGT6 did with it in his 2.5l GT6 before that!! I will still have it looked at by Mike Papworth before I do the RBRR. Link to comment Share on other sites More sharing options...
Richard B Posted May 23, 2012 Share Posted May 23, 2012 Nick_Jones wrote:This compares with OD which is 0.8:1 (actually D type 0.802 and J-type 0.797) or 5th on a Toyota W58 at 0.78:1. And yes, I know there is another variant of the J-type which is taller but I can't find the number just now......D type is 22%J Type 25% or 28%Not sure what the A'Type was as used on the Slaoons and TR's Link to comment Share on other sites More sharing options...
Clive Posted May 23, 2012 Share Posted May 23, 2012 Hang on a moment.I initially ran a 3.27 in my 2.5 vitesse, but after I broke the third one i fitted a 3.63, which lasted with no issues. In fact that diff went into my Zetec spitfire, and is bolted into the chassis of the current project. The 3.27is a bit more relaxed, but not good for longevity if you have a heavy right foot 8) Link to comment Share on other sites More sharing options...
Deleted User Posted May 23, 2012 Share Posted May 23, 2012 I should have kept my diff and given it a go in the Zetec powered Spit, but I did not know last year that I was doing the conversion, so I sold the diff. It went to a bloody good home :)After doing a bit of homework I will be sticking with the 3.63 and if that gives up,Ill have to look at a seirra diff (lsd) but hey I got to finish the car yet. :P Link to comment Share on other sites More sharing options...
TimW Posted May 26, 2012 Share Posted May 26, 2012 cliftyhanger wrote:Hang on a moment.I initially ran a 3.27 in my 2.5 vitesse, but after I broke the third one i fitted a 3.63, which lasted with no issues. In fact that diff went into my Zetec spitfire, and is bolted into the chassis of the current project. The 3.27is a bit more relaxed, but not good for longevity if you have a heavy right foot 8)Only time will tell but I bet it's done 10,000 miles and is still going strong. ;) Link to comment Share on other sites More sharing options...
TimW Posted May 26, 2012 Share Posted May 26, 2012 bobyspit wrote:I should have kept my diff and given it a go in the Zetec powered Spit, but I did not know last year that I was doing the conversion, so I sold the diff. It went to a bloody good home :)After doing a bit of homework I will be sticking with the 3.63 and if that gives up,Ill have to look at a seirra diff (lsd) but hey I got to finish the car yet. :PHappy to have given it a new home. 8) You can have it back once I've broken it :) :) Link to comment Share on other sites More sharing options...
TimW Posted May 28, 2012 Share Posted May 28, 2012 OK I have made a mistake with speed-rpm ratios on my set up.With a V6 ford Type 9 and a 3.27:1 diff on 185/60-13's 60mph=2500rpm70mph=3000rpm80mph=3500rpm90mph=4000rpm100mph=4500rpm110mph=5000rpm120mph=5500rpm130mph=6000rpm (theoretical) All checked using a sat-nav and a 38 year old smiths tacho!! Checked on a private road ;) 8) Link to comment Share on other sites More sharing options...
thescrapman Posted May 28, 2012 Share Posted May 28, 2012 TimThose figures are not linear, suspect a tacho inaccuracy.:-) Link to comment Share on other sites More sharing options...
Nick Moore Posted May 28, 2012 Share Posted May 28, 2012 Tim is probably getting wheelspin at high RPM ;) Link to comment Share on other sites More sharing options...
Royboy66 Posted May 28, 2012 Share Posted May 28, 2012 Having now driven the Mad Sprout........its Quite Linear at all revs ! ;D ??) Link to comment Share on other sites More sharing options...
Hugh Posted May 28, 2012 Share Posted May 28, 2012 royboy66 wrote:Having now driven the Mad Sprout........its Quite Linear at all revs ! ;D ??)Hey when did you get to do that :( :'( Link to comment Share on other sites More sharing options...
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