Y1 Transmission rebuilding

[Dylanamus]

Researching while I still have a few synchros left...

I'm looking into getting my gearbox rebuilt and adding an LSD.

I don't really want to just get all the exact same parts from Honda, because more than half the expense is labour and I figure I should use that investment to make a BETTER transmission.

If I'm getting custom parts, I want a closer ratio gearset with a higher final drive. I plan on using the car for low top speed events, such as tarmac rally/hill climb etc

I don't want a dog box and I don't plan on throwing any more than 130kwatw at it. Budget $2500ish for transmission.

Questions...

Who is well reputed for doing this kind of work in Melbourne, ie custom rebuild (involving custom parts)?

Straight or helical gears? Why?

Could I still use OEM synchros taking this custom path? Would I be better off getting custom synchros too?

Any other constructive advice or suggestions?


Thanks

[Kawasaki]

as far as i know there are no off the shelf FD's for cable boxes

[Dylanamus]

Seems to be bugger all aftermarket support for cable boxes! Including clutches and flywheels! The conversion to hydro seems a blind spot for most mechanics once you start talking seriously and stop just hypothesising..

What would happen if I left the final drive the same and just changed the size of gears etc?

[fatboyz39]

Whats wrong with your current gearbox?

[Dylanamus]

Most of the synchros are buggered. I COULD rebuild it with new OEM parts and it would be fine... but like I said in the first post, doing that would cost up to $2k anyway, so I figure I might as well pay a bit more and walk away with something that will allow faster shifting and closer gear ratios.

[kyle]

Can you get a type R Gearbox and just bolt it up to the y1 bellhousing? So it's cable operated, but uses type R gearset, 4.7 Final Drive and LSD?

[Dylanamus]

kyle: I wish! Apparently it's possible to use the ITR box, but not maintaining the cable operation. THere are hasport hydro/cable conversion kits that aren't specifically designed for my model and aren't a sure gaurantee to solve the specific scenario I am faced with. But a new ITR box is like $2800 anyway

[TODA AU]

Seems to be bugger all aftermarket support for cable boxes! Including clutches and flywheels!

So you know, the B16A cable & B16A hydro use same flywheel & clutch cover.
The difference is the clutch disc.
Cable is 220 x 25 x 24
Hydro is 220 x 26 x 24
Measurements are Disc OD, Spnine OD & No. of teeth.
So a TODA flywheel for B16A~B18C can be used,
Further, in the Exedy range the following clutches are available:
Sports Tuff - Heavy duty
Sports Tuff - Heavy duty cushion button
Sports Tuff - Heavy duty button
Sports Single - Sports Orgainc
Sports Single - Race Ceramic
Hyper Single (Clutch & flywheel)
Hyper Twin (Clutch & flywheel)
Hyper Comp R (Clutch & flywheel)
Exedy also manufacture a lightweight flywheel to suit the sports tuff & sports single clutches.

[pornstar]

Dylan, we rebuild our cable boxes using oe parts from other d series gearboxes to get the right ratios, its an easy job for us, and you'll get a heap of change from the 2,500

[Dxs]

intriguing andy, care to expand?

what about synchros? are those from the d series?

[Dylanamus]

Thanks Adrian, I shall keep that in mind. So if I wanted Sports Organic, what flywheel do you guys offer to then suit that clutch with my gearbox?

Andy... looking forward to the reply, as is fellow EF8 owner, DXS.

[Dxs]

so the clutch is only different because of the spline size?

in theory you could bolt a y1 to any b series, using the stock flywheel to that b series?