normal rpm on b series gearbox, when in 5th gear, 100km/h

[kerim]

ey guys,
i am curious to know what the average/normal rpm should be when doing 100km in 5th gear on a b series box. My car stays on about 3800/3900RPM, and that seems to be very high, is that normal?

Also could that mean that my gearbox was previously changed with higher ratio gears or something

thanks
kerim

[Spunkymonkey]

which b series box are you using? I'm using a b16a box, and it will be higher rpm slightly to my b18c vtir box before due to shorter ratio

[kerim]

not sure, was in the car when i bought it, how can i find out?

[90LAN]

it should be around 3200
your revs sounds like u have the 4.78 FD gearbox

[kerim]

it should be around 3200
your revs sounds like u have the 4.78 FD gearbox

what car is that off, is it lsd? or are the gears just changed?

[90LAN]

b series boxes are 4.4 FD
the 4.78 FD boxes are from the DC2R 98+ spec boxes
u can get after market FD too
is there a bar code on the box u can check the code to determine what box it is

[kerim]

heres the code on the box

http://img259.imageshack.us/img259/1285/img139ek2.jpg (http://imageshack.us)

[90LAN]

http://www.teirney.net/civic/GearboxRatioReference.htm

[kerim]

thanks for that man, so its either a
JDM 96-97 Integra R (LSD)
JDM Civic R [EK9] (LSD)
JDM Civic SiR [EK4, EG6] (optional LSD)

is there any obvious ways of telling if its LSD or not?

[flipstar]

mine sits on 4.2-4.5 on 100kms very short final drive but

[PaZzMaN-R]

your a nub

[EG30]

my dc2r aust spec with 4.785 FD and 195/55R15 tyres revs is 3450rpm at 100km/h. Mind you that's indicated 100km/h on speedo so true speed prob more like 95-96km/h. Indicated revs could vary up to 200rpm also.

my guess is you have a b series box with 0.85 5th gear and someone replaced the FD with a 4.785 or 4.9 FD.

make a bit of difference too with your tyre size.

[IEVAQ8]

my dc2r b18 gear box, in 5th at 100kms sits no more than 3400