I would never have a dog box, but this synchro straight cut sounds like a blast. Also anoother kettle of fish is the strengthened angled cut that has physically large profile teeth and possibly less angle
<div class='quotetop'>QUOTE (Sam_Q @ Nov 9 2007, 10:45 PM) </div>PPG do, Albins do...PAR maybe sam.
ive seen alot more straight cut synchro boxes (mainly coz they are cheaper, and not such a bastard to drive like a dogbox -for road cars-)
for wrx,evo etc.
as for the noise...i love it...especially if its on over run...you get there reeew reeew reeeeeeeeow as the input shaft slows down...
drive a dogbox and you'll see they have being coasted, its either under load or it just slops around
I would never have a dog box, but this synchro straight cut sounds like a blast. Also anoother kettle of fish is the strengthened angled cut that has physically large profile teeth and possibly less angle
30kw club
ok lets take a t-50 just for reference,
how many peope here have cracked/knocked teeth off a standard box with out any other damage to the box?
probably none! most will disinto register teeth or engagement teeth (usually by releasing the clutch too early before the next gear is engaged).
others would legitimatly have too much power for a t-50, but they don't just fail gears. the either destroy bearings leading to shaft movement, or they just bend/flex the main shaft, both of which lead to gear failure, not cos the gears arn't strong enough, but because the mesh angle and depth have changed.
so why pay 5g to get striaght cut gears? for the sound!
there are plenty of other ways to strenghthen a gearbox, and the cheapest way is usually just a swap
yeah thats an interesting point, what actually breaks on a T50? anyone got pics?
30kw club
i was under the impression the input shaft on t50's would snap/twist if put under too luch load...
probably does, thus my point is, why pay for straight cut gears? if your input shafts is going to twist in half anyway.
that's for a t-50, but i'm sure even w-58's have a weakness and i doubt that the gears would just crack
A good point.
I asked the same question of PPG when we ordered a replacement gearset for a customer who had destroyed 5 standard 180SX (SR20DET) boxes. Three of the failures were due to the end of output shaft twisting off where the splines started. The other two were 2nd gear failures. The teeth simply striped off the gears when the engine came on boost :blink:
PPG told us quite simply that they supplied upgraded shafts as part of there gearsets and the strength of the new componets far exceeded the strength of the new gears. That sold me. We ordered a set of 1st, 2nd, 3rd, 4th straight cut dog gears, and 5th as a syncromeshed heilical cut gear.
The customer is extremely happy with the final result. The standard boxes were breaking rolling on second gear (no clutch dumps, the owner was not stupid) with 280kw ish at the wheels. Now with 360kw at the wheels it has survived over 12 months of abuse on the street, and a handful of drag meets. Its now possible to launch at 7500 with 275/50/17 micky tompson ET streets and not brake any thing. Well thats not intirely true, it chewed through a couple of crown and pinion sets before the owner upgraded to a R32 GTR rear cradle and diff. (they just bolt in, bless nissan and thier interchagability of parts :2thumbs: )
But i digress, what I'm getting at is this, Quaif, TRD, PPG, whoever, are not going to sell a replacement performance gearset, unless it can handle a substantial hp increase. The issue of wearing out bearings will be aleviated by upgrading the shafts as they will no longer flex and stuff the bearings. If a good quality and correct grade of oil is used, the standard T50 bearings should have little trouble dealing with a lot of extra HP.
J.
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