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Post by Miniböttcher on May 27, 2009 21:55:25 GMT
right build the gearbox for the mk1 straight cut, close ratio ,cross pin diff, standard drops dave has suggested 3.1, which is what he has and its works well, lower revs at 60-70 mph, compared to a 3.44, asked ac dood, he suggest with my engine spec that using c/r sc gear and 3.1 , i would not get the best out of my engine, best to have standard gear and a 3.2 1. problem 2nd gear was gone on the original gearset, i have got another gearset but used and unknown condition, but why waste a good conditon S/C gearset 2. finding a 3.2 ratio, i have a many 3.44, 3.1 ,3.5, 3.7 but no 3.2 stephan is after one and cant find one my gearset www.minispares.com/Product.aspx?ty=pb&pid=38071&title=GEAR%20SET%204%20SYNCHRO%20ST%20RAT... tempted just to run it but not sure how less i will not get out my engine, but in a few years there will be a 1293 fast road engine going in so a 3.1 will be about right all suggestions, high tech info wanted, its needed at the moment. and please people post what you think even if it starts a dissagreement. |
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Post by paul1275s on May 28, 2009 2:03:34 GMT
At the end of the day a s/c gearset is not ideal or necessary for the use you want to put your car to, but, if that is what you want, fit it, it's your car. As long as your can put up with the noise! (or like me actually enjoy the noise..) I've got a 3.44 on my S, which suits me fine, but a 3.1 will be better at motorway speeds, although you will lose the acceleration which may show up more with your small bore engine. I think the difference between a 3.1 and a 3.2 would be very insignificant. Useful gear ratio calculator here; www.minifinity.com/distribution/viewtopic.php?f=206&t=73640 |
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Post by Simon1275mpi on May 28, 2009 11:47:04 GMT
3.1 on my 55bhp 998 on 10" is nice  Go with AC on the advice if you can afford a new one at £150..... Else its 3.1 for cruising or 3.44 for the go factor and change it one weekend in the future. Gearset of unknown condition, have a look and it will be of known condition :-P |
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Post by Stephen on May 30, 2009 13:02:32 GMT
I got fed up looking for a second hand 3.2 and ordered up a brand new one
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Post by mccarefree on May 30, 2009 16:37:10 GMT
For what it's worth: I think there can be too much navel gazing with this sort of thing. Alex has (something around) a 3.1 in his stage 1 998 and with just over 50 brake it goes very well for a littlun. I have an original 3.765 in my MkII Cooper with 60 brake and to be honest it doesn't feel a whole lot more accelerative though at around 15mph per 1000 it's a bit noisy. My Tahiti has a 3.1, and is pretty brisk through the gears but it's a tuned1275 and quite torquey. If you're going for a tuned big bore in a little while on the same box, put in the 3.1 and within a week you'll be quite happy with it. I don't reckon you'd notice the diff - erence (hehe) between 3.1 and 3.2. Cheers, M.
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Post by Stephen on May 30, 2009 17:29:58 GMT
I'll notice the difference because I've changed the gearset and first gear is taller than usual. So top end I won't notice any difference but with a 3.1 it will mean I'll be bogging down off the line
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Post by Miniböttcher on May 31, 2009 22:18:20 GMT
been chatting to ac dodd more about gearsets ratios with diffs ratios, and the best combination etc etc etc etc etc etc etc etc etc
"THANKS FOR ALL YOUR HELP", and yes i agree martin and si that a 3.1 or a standerd gearset is fine, but my s/c gearset if is close ratio and a 998 with a mild cam does not have enough torque for it to work properly and it will lug everytime i pull away from rest
this s/c c/r gearset is more for tuned 1275's with lots of torque
so the s/c gearset is NOT going in but a standard set is, i have many other gearboxes , remote, pre A plus rod , A plus, so i am going to see if or how a A plus gear set will fit into a remote pre A plus box
as a A plus gearset have a thicker 18mm main shaft and are stronger,
but dont ask if i am selling the s/c gearset as i want to keep it till i put the 1293 engine in , in a few years, unless i get a very good offer
diff wise i have have 2 options hunt for a 3.2!!!!!!
or use a 3.44 and change the input gear to 28 tooth, which would give" 3.32:1 "This would give you slightly higher gearing than the 3.44 but more acceleration than a 3.21. " ( quoted by ac dodd)
i let you know how it goes and if a A plus gear set goes into a Pre A plus remote gearbox
THANKS AGAIN, its great to be able to chuck ideas back and forward and see what other people think and heard there opinions on what they have done
cheers
dean
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Post by Simon1275mpi on Jun 1, 2009 14:11:11 GMT
Input gears? Your changing the drop gears for a lower ratio?
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Post by monkeyjim on Jun 5, 2009 12:39:20 GMT
as said to you Dean I have used 3.4 and 3.1 in mk1 both with 1275 engine and 10 inch wheels .
I thought 3.4 was to much . Took advice from AC and MED , both recommended 3.1 as it would get used on dual carriageways and motorways . Basically a all round diff ratio .
You have seen how mine goes along motorways and how it goes along B roads .
I have no complaints with the 3.1 .
So with a 1275 based engine I would use a 3.1 .
What were the last of the 10inch wheeled 998s fitted with ?
Ask Si for a run in duckling on a bit of dual carriageway monday . After all he has got a 998 and a 3.1 .
Sorry to drop you in it Si .
;D
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Post by Simon1275mpi on Jun 5, 2009 13:18:06 GMT
What were the last of the 10inch wheeled 998s fitted with ? Ask Si for a run in duckling on a bit of dual carriageway monday . After all he has got a 998 and a 3.1 . Sorry to drop you in it Si . ;D The last of the 10" 998 mini's were eco diff 2.95 and high ratio drops which works out as a 2.7ish ratio. Great for the motorway but slow getting there. 3.1 is still too high for a 998 fun factor 30-50mph. I'm commuting 30miles a day & 200miles on motorways every other week at motorways speeds, pushing Bini's out of the fast lane.... all at 46mpg! AC's ratio with the extra power will give that 'acceleration thrill' |
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Post by Miniböttcher on Jun 5, 2009 20:23:49 GMT
come on come on, people are agreeing with each other to much
diff ratio's is normal a post were everyone has a differnt idea of what is best.
but anyway, thanks for all your ideas , i have a 3.1 but i think i may hunt for a 3.2 as i get the best of the 3.1 and 3.44,
its just finding a 3.2,
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Post by paul1275s on Jun 6, 2009 14:29:29 GMT
we may be able to help, just need to check something...
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Post by Stephen on Jun 6, 2009 17:26:33 GMT
if it's the turbo then I've had that apart already - its a 3.44.
If you get deperate then new 3.2s aren't too expensive in the scheme of things... although 2nd hand is obviously much better!
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Post by monkeyjim on Jun 6, 2009 17:50:40 GMT
What were the last of the 10inch wheeled 998s fitted with ? Ask Si for a run in duckling on a bit of dual carriageway monday . After all he has got a 998 and a 3.1 . Sorry to drop you in it Si . ;D The last of the 10" 998 mini's were eco diff 2.95 and high ratio drops which works out as a 2.7ish ratio. Great for the motorway but slow getting there. 3.1 is still too high for a 998 fun factor 30-50mph. I'm commuting 30miles a day & 200miles on motorways every other week at motorways speeds, pushing Bini's out of the fast lane.... all at 46mpg! AC's ratio with the extra power will give that 'acceleration thrill' scrap the borrow The Duckling idea then .  Just put the 1275 in and be done with it . Let brain rule heart ;D . |
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Post by Miniböttcher on Jun 6, 2009 20:40:57 GMT
was thinking of using the original 850 engine with the old cone gearbox, got any spare parts
ha ha ha ha ha ha ha ha ha ha ha
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