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Guys im having some issues figuring out final drives...my 2000 model audm ITR at 100kms revs at 3500rpm in 5th gear where as a friend of mine who has a 2000 model audm ITR as well says his car revs at 3900rpm at 100kms, although his not sure if his gearbox was ever changed over before him owning it.... something sounds weird here.... can any1 explain?
cheers
Oem rev counters are NOT accurate.
what tyre sizes are you guys running??
Quote:
Originally Posted by DLO01
Good infoQuote:
Originally Posted by SLOBRO
also you can check out what the accurate readings are
http://www.teammfactory.com/gear-calculator
Just type your info there and have fun
My Teg vtir revs at 3500 in 5th if that helps lol.
Got 14s btw
Could it really be out by 400rpm?Quote:
Originally Posted by DLO01
it must me the jdm itr 4.7 final drive gearbox?
look to make it easy just find out exactly what tyre sizes both you and your friend are runningQuote:
Originally Posted by dc2r-man
3900 at 100km sounds like a b16 tranny with A 4.7 or 4.9 final drive
Audm gearbox is the same as jdm 98-00Quote:
Originally Posted by dc2r-man
Im running 205/50/15 and im not sure what my mates using but the tyre size wouldnt effect rpm by 400?Quote:
Originally Posted by SLOBRO
anyway to confirm this, you could be right, as it would be a direct bolt upQuote:
Originally Posted by gen2 CRX
bro tyre size does affect revs and your speedQuote:
Originally Posted by dc2r-man
if you use small diametre wheels you'll have quicker acceleration but lower top speed and if it's bigger diameter you will have slower acceleration but higher top speed
http://www.teammfactory.com/gearcalc...ission+1+%26+2
Above is a b16a tranny with 4.928 final drive vs 98 spec ITR tranny with 4.785 final. 205/50/15 tyres
Play around with the gear calculator it also helps you to understand gear ratios better.
Mate that looks right and makes the most sense, i think it may be a b16a gearboxQuote:
Originally Posted by gen2 CRX
anyway to identify a b16a box from the outside? any stampings or marks?
There are many variables to know for sure if the gearbox is not a factory ITR box.. Maybe your friends tach is really off or he is running a weird size tyre, I dont know.. does he have stock ITR wheels?
The gearbox could even be a JDM 96 spec ITR gear box which has the same ratios as a b16a box but factory LSD with the same marking as a 98 spec ITR and VTI-R (S80). The sticker on the gearbox represents the series/chassis the gearbox is made for NOT the gear ratios. For example. B16A and B16B in a EK4/EK9 body will both have gear box's marked S4C. B16B gear box has same ratios as B16A but NO LSD. Type R gearboxes should have a marking though that they are LSD on the casing of the gear box which can wear away over the years.
Your mates gearbox could even have the 5th gear swapped to a b16a 5th gear which would give you a similar result to b16a gear box with high final drive. The only way to know for sure what 5the gear/final drive without opening the gearbox is to do top speed test of both cars and I dont recommend this on the street haha
i know he said it is an lsd,and he bought it to replace his ****ed gearbox in his ITR, his car has only done 100k kms, and i think he was using stock wheels.... speedo couldnt be out that much
mine revs at 3900 at 100km/h on stock taco, yet my apexi unit says im only revving at 3500. So the taco is out. Im running 2001 dc2R Audm with 205/50/15