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The Final drive differential crown wheel/pinion gearing on your AYR gearbox is 71/18 which gives a ratio of 3.9444 to 1
which will give 2744 rpm at 100 kph or 36kph per 1000 revsYour 5th gear ratio is 34/45 which = 0.7555
which is the same as the 02A AYN 2wd gearboxThe AYN gearbox has 70/19 which is 3.684 to 1 –
which will give 2560 rpm at 100kph or 39 kph per 1000 revsYou can work out your speed & revolutions from these figures here,
http://www.scirocco.org/gears/
Tyre diameter & circumference here
http://www.miata.net/garage/tirecalc.html
what would be the calcucated rpm vs. speed if i get that .658 gearset?
http://shopping.boraparts.com/product_info.php?cPath=21_26_59_61&products_id=68
1000 rpm = 41kph
100 kph = 2387 rpmbtw all calculations have been made assuming you have 195/50-15 tyres fitted.
Specification – Sidewall – Radius – Diameter – Circumference – Revs/km – Difference
195/50-15 — 98mm — 288mm – 576mm — 1810mm
553
0.0%
195/45-16 — 88mm — 291mm – 582mm — 1828mm
547
1.0%
185/55-15 — 102mm — 292mm – 584mm — 1836mm
545
1.5%The rolling radius difference of 1% to 1.5% is not really worth worrying about, as it would only give a speed of 101 or 101.5 kph at same 2387 revs
Before someone misunderstands me,(not you Dan) all 4 tyres must be the same size front & rear!
i’m not dead
car isn’t dead, and some more paperwork are coming my way as we speakthe abs > non abs conversion paperwork
so. i’m getting there now. hopefully within this month
final inspection on monday btw
had the rear brake valve adjusted today
which i needed to get the car through inspectionbecame WAY better to brake with, now i actually have normal brakes and not only on the front end.
and. i’ve got way too much noise from the drivetrain. not sure if its the diff or the wheelbearings, gonna start with the easiest (bearings)
just need to get a hold of 2 new bearings
Thats a good question, they could be either 68 or 72mm, VW seem to have fitted whichever swing arm (& Bearing) that they had in their hand, I am afraid ETKA is no help here so you wont know till you take them apart, btw have you checked the (Adjustable) play in your diff bearings?
well. then i’ve got to disassemble it and check before i buy bearings
and no, how do you adjust the play?
On the left hand side of the diff there is an adjuster ring where the drive shaft goes in, so you can set the play in the internal diff bearings
Have a look here
ETKA – Gosy – 1990 – 5 – 25 – 106-40 part nr 11 adjuster ring – 13 locking ring
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