wat is going wrong with my drive train??

[joecoolmk2]

yer i was planning on geting a proper speedo test done on the dyno or beside my moms car(01 camry). i just counted the revolutions with only one wheel jacked up, 20 tail shaft 10 wheel, so thats 2:1, now that sounds really rong. i dont know what is going on. i will just leave it how it is and get it tuned and hope for the best.

thanks for all the help

laterdays

like i said, you have to mark and count both wheels together, otherwise the other wheel might turn slightly as well, or it could stay stationary and accelerate the revs of the wheel your counting. it's completely variable and completely inaccurate.

[crowncustom]

Ok the speedo head should be fine.Now is the gearbox itself the Supra style box or steelcase?If you do have 4:1 ratio diff and the speeds you have indicated it should be doing more speed but if the speedo cog in the box does not match to the diff gears then yes your speed readings will be up the stuff.
cheers Brett.

[lilcrash]

its an alloy case supra box and im pretty sure the diff ratio comes in at 3.9:1. i will get a speed test done next week so i know whats going on when i get my licence back.

laterdays

[lilcrash]

how would a w55 go?? would it be better or worse??

thank you

[lilcrash]

ok i have bought a t312 diff centre from a ra60 and a w57. will this be a big improvement or should i just give up??

[SpleenieMcSpleen]

i dont know if this will help but i found this a while ago,

http://www.carbibles.com/tyre_bible.html

if you are uncertain about the tyres it is also a good read for interests sake, if you scroll down about 3/5 of the page there is this really handy tyre calculator for determining the odometer change with tyre change, problem is it is in mph so you kinda need to convert that, either this is helpful or im wasting time, if so sry