B-series gearbox question

[hattech-v]

it can be done. but lots to do.
lot of ef small v do this kind of conversion. normally the just need to change the middle part of the gbox housing to fit the clutch pump n the fork. the other part use back original housing.

 

[SA6YEuro]

hmm... thanx bro... makes sense..... tt means the mounts is untouched rite? as in use back the ori 1 or still hafta mod?

 

[mágnécõré]

I hav 1 question...
how about the EK B16A non-LSD gearbox convert/modify to LSD gearbox ..
is it can be done..?? wat i meant is just add a another part to make it LSD...

 

[shiroitenshi]

I hav 1 question...
how about the EK B16A non-LSD gearbox convert/modify to LSD gearbox ..
is it can be done..?? wat i meant is just add another part to make it LSD...

Kaaz makes LSD for the Y21 g/box, I think it's around RM2.8-3K.
Clutch type, and will need to be rebuilt from time to time.

The difference is at the final drive holes to mount the LSD, I believe, so there's also the option of swapping final drives and using type R LSD. Not to sure though.

 

[amran]

i actually have a LSD gearbox but recently got crack on the housing. anyway i can replace the housing only ? or is it expensive to change housing and better buy another gearbox ? how much if somebody have experience changing the gearbox housing ? Suggestion .. ?

 

[shiroitenshi]

i actually have a LSD gearbox but recently got crack on the housing. anyway i can replace the housing only ? or is it expensive to change housing and better buy another gearbox ? how much if somebody have experience changing the gearbox housing ? Suggestion .. ?

Yeah, you can change the housing.
Depending on what final drive you use, some of the gearbox housing may need modification, like the Y21housing would not fit a 4.785FD without some modifications.

If near stock FD of 4.4/4.5, I think most b-series housing should fit.

 

[hattech-v]

Y21 gbox housing only need minor mod to fit type r lsd... regardless what fd u use...
getting a gearbox housing is cheaper than getting another gearbox... only a bit difficult to get...

which part ur housing crack? i think i got spare... hehe

 

[hattech-v]

Kaaz makes LSD for the Y21 g/box, I think it's around RM2.8-3K.
Clutch type, and will need to be rebuilt from time to time.

The difference is at the final drive holes to mount the LSD, I believe, so there's also the option of swapping final drives and using type R LSD. Not to sure though.

the EG lsd different with EK lsd. yes at the fd holes to mount it to the lsd. and one more thing, most of the aftermarket final drive is available for EK lsd.. if not mistaken only 4.4 and 4.9 available for eg lsd.

 

[amran]

Y21 gbox housing only need minor mod to fit type r lsd... regardless what fd u use...
getting a gearbox housing is cheaper than getting another gearbox... only a bit difficult to get...

which part ur housing crack? i think i got spare... hehe

TQ shiroi & hattech. cracked near the front mounting. i think mine is just a standard EG6 LSD. how much is the cost of the housing ?

 

[hattech-v]

normally 5-6hundred.

 

[evoX2]

cost more than half lo.....

 

[hattech-v]

better than full... kekkekeke

 

[amios]

bro, now im using new lsd gearbox n pomen say its type r 4.4..
but in 4k rpm only 118km/h...it's 4.7 or 4.4? pening nie..

 

[sybaritic]

bro, now im using new lsd gearbox n pomen say its type r 4.4..
but in 4k rpm only 118km/h...it's 4.7 or 4.4? pening nie..

mr amios.....hehehe.....hows ur new 1.8gsr engine...?
r u satisfied its standard power?
i thought u r using s80.....standard for 1.8gsr gearbox...

 

[shiroitenshi]

Amios, there are no way to know the ratio short of stripping it down, or datalogging a run to see the rev drops after each gear. Even then that is a dubious guess due to tire sizes and tire expansion rates, and also the notoriously inaccurate speedo.

These were done by logging with the Innovate Auxbox unit,RPM and speed tapped from the ECU. tire sizes accounted for, but slight inaccuracies expected from tire expansion rates.

At 5th gear, on 205/50/15 tires

Y21 Gbox is 0.848 x 4.4 FD = 118.42 Kmh at 4K rpm
S80 Gbox is 0.747 x 4.785 FD = 117.33 kmh at 4K rpm

Obviously you can't notice the 1kmh difference on the meter.

For the S80R gbox with 4.785FD (these are not full throttle runs, to avoid wheelspin messing up the numbers), with the stock rev limit of 8K (or 7.8, if you want to be particular), It's normal for the meter to show higher/lower than actual rpm, so if 5300 is mentioned, then it's expected that the STOCK DASH meter will be close to 5,500 rpm region and 5600 rpm will be close to/at the 6000rpm region, The numbers below are rounded up, they are more like 5254rpm (e.g) in the datalog.

if you have a rev/speed/VAFC rpm readout, then it would be a lot easier.

Rev drop per gear from 1-5, S80 = 1st - 2nd 5300rpm , 2-3 = 5600, 3=4 5700, 4=5 6000

Y21, 5300, 5600, 6000, 6200. in the same order as above.

Supposedly CTR g/box with 4.4 FD has the same ratios as Y21, but I cannot confirm that one, unless someone stripped down the gearbox and counted the ratios before.

GSR gearbox with 4.4, for those wondering, the rev drops are
4800rpm, 5800, 6100, 6100.

That's assuming there's no rojak ratios like a Y21 with a 4.5FD, and you aren't using tire sizes that are way different than 205/50/15