Look what arrived today... No more 4th gear issues!

[continuecrushing]

In before people start asking for a GB to make it "affordable"

[boredom.is.me]

In before the in before posts.

On a serious note, has this been tested? Are there at least any theoretical numbers?

[STV3]

Originally Posted by brianhj

Forgive my ignorance, can these handle more torque?

Yes

[zc06_kisstherain]

how much? subscribed as well

[STV3]

Originally Posted by zc06_kisstherain

how much? subscribed as well

My Guess would be 5-6k range

[zc06_kisstherain]

Originally Posted by STV3

My Guess would be 5-6k range

Holy Moly!

[Chad_W]

I thought straight cut and synchromesh were exclusive, how does that work?

[RockySDS]

Originally Posted by Chad_W

I thought straight cut and synchromesh were exclusive, how does that work?

They're straight-cut gears with syncros. So it's not technically a dogbox as it still has the synchros but has the strength of the straight cut.

[crazyfrenchbiker]

Well that was quick! When are you installing it?

[jdp530]

We all want a sequential trans.

[burdickjp]

Originally Posted by Porcupint

http://www.ft86club.com/forums/showthread.php?t=60841

I went to the thread. It talks about the symptoms, but doesn't say what actually broke in the transmission. For all we know, it could have been a shift collar, which this gear set wouldn't fix.

[themadscientist]

Gear cuts are straight or helical
Engagement is synchomesh or dog

A quick primer on these things.
http://www.superstreetonline.com/how...sh-vs-dog-box/

Now on to the music! The PARs aren't super loud, but he does have a an open wastegate drowning them out.

[ame="https://www.youtube.com/watch?v=rpzzHuaPLnc"]2011 WRX - PAR Straight Cut Gears - Cusco and Kartboy Mounts - Video 2 - YouTube[/ame]


So, about this gearbox, second AND fourth break? Cripes, man. I am so relieved I never had any intention of cranking up the power more than 25%. New cars are so fragile with the manufacturer building them "just" strong enough to try and save costs. Step one is re-engineer a hand grenade transmission? I already have a hand grenade oil pump on the GT-R, I don't need another EOD mission on my daily driver.

Can't wait to see your results. If you don't post video, though, the kitten gets it. Think of the kitten!

[lamawithonel]

Originally Posted by brianhj

Forgive my ignorance, can these handle more torque?

It depends...

All else being equal, straight-cut teeth are "weaker" than helical teeth. In a helical gear (diagonal-cut) the teeth gradually come together at the sides, rotating through and gradually lifting at the opposite side. With straight-cut gears the teeth smack into each other all at once. This creates the characteristic whine, but also a lot of shock stress on the teeth. Helical gears also distribute the forces through more material. All else is probably not equal here, though. I'm guessing the alloy and manufacturing process for these are far better than the stock gears.

There's also a trade-off with helical gears as they transmit forces axially (red arrows), putting stress on the bearings and transmission case. Lower angled gears reduce these forces, and straight-cut gears nearly eliminate them. With our boxes, though, AFAIK this hasn't been been an issue. But if the teeth can hold, it's one less thing to worry about down the line.

Anyway, I'm interested to see how these perform. Keep us updated.

[Streetthrowback]

subbed