Sequential or dog box is the only real fix when pushing past 500nm with wide grippy tyres.
GR Yaris I Broke my third Transmission at track 。this time GRMN close gear set
- Thread starter Diyman25
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SayonaraLicense
Devoted member
Does anyone actually have any real world experience of the cusco hubs failing? If so at what point?
I cant seem to get a direct answer or info on this.
With (500NM/E60 flex fuel with GCG turbo ) track use with ATS twin carbon clutch , Is still push limit of Cusco hub
SayonaraLicense
Devoted member
Did they actually fail? or did you change to sequential as you believed/thought they might fail?
After chatting with my gearbox specialist and examining the Cusco Hubs, they are a decent solution for the 500-600nm mark WITH a shot-peened gearset. It is likely the better option for those who still street their car as the sequential options will need higher and more regular maintenance which means overhauling it, not just an oil change every 3-5000km.
Sekred
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- Dec 18, 2021
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It might survive at those torque ratings I really doubt it though. The trouble is I think the housing will start to flex and then bang goes the gear set.
I would chat to Fensport in the UK. I think they broke their Modded H pattern at around 500hp and gave up and went sequential.
Sequential is the fix, but the cost is two fold. No change out of 23k AUD and 3k+ overhaul every 5,000km or so. The latter is what people don't talk about and what the sequential sellers don't openly disclose because it kills their sales.It might survive at those torque ratings I really doubt it though. The trouble is I think the housing will start to flex and then bang goes the gear set.
I would chat to Fensport in the UK. I think they broke their Modded H pattern at around 500hp and gave up and went sequential.
Most efficient way, yes. By service, I am assuming you mean overhaul.
Sekred
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I could get the Trans out of my Fiesta ST. Needed a transmission jack where you could adjust the angle. By the time you were ready to lowered it to the floor the angle was around 40 degrees. The clearance between the subframe and the transmission on the GR is smaller so its engine out I would say 
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.Similar to Mercedes, out from the frontI could get the Trans out of my Fiesta ST. Needed a transmission jack where you could adjust the angle. By the time you were ready to lowered it to the floor the angle was around 40 degrees. The clearance between the subframe and the transmission on the GR is smaller so its engine out I would say
It might survive at those torque ratings I really doubt it though. The trouble is I think the housing will start to flex and then bang goes the gear set.
I would chat to Fensport in the UK. I think they broke their Modded H pattern at around 500hp and gave up and went sequential.
I think we should consider that users like Fensport and Diyman are pushing 500+ hp and are competition level drivers, they are probably in the top 1% population of aggressive mechanical wear. Diyman has more aero than a F-16 lol
The Cusco hubs may be fine for most normal drivers even with increased power.
SayonaraLicense
Devoted member
I've been speaking to Charles at Lamspeed and he says that he has multiple cars running the Cusco solution at 420whp (circa 500bhp) with no problem so far. Obviously not ideal but 'should' be OK if you're not a complete noob with a manual. Tbh one of the core reasons I bought this little beastie was because it was a manual, hence why I'm not keen on a sequential.
Sekred
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- Dec 18, 2021
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Just to add to that I had the Trans in and out about 8 or 9 times. Had it out so many times I have forgotten why. Broke the trans once, installed LSD, multiply times for the clutch and single mass flywheel.I could get the Trans out of my Fiesta ST. Needed a transmission jack where you could adjust the angle. By the time you were ready to lowered it to the floor the angle was around 40 degrees. The clearance between the subframe and the transmission on the GR is smaller so its engine out I would say
Installing was more difficult than removal-aligning up the clutch was a pain. Did it get any easier?.
No,
.
Just jumping in here as we've got stock of the Cusco hubs and some brass shift fork pads coming for December, I think over time more and more track cars with 420-500nm of torque will see gearbox issues. We're about to pull apart my transmission to upgrade hubs and the shift forks. My car makes 460nm of torque on a ~12 degree day and has seen 20k miles of mostly hard use and lots of track use and I have difficulty with 2nd gear now, I'm curious when it comes apart if I've just damaged the shift forks, clutch hubs, syncros or a mix of all of them.
Be interested to hear what the diagnosis is!
SayonaraLicense
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LittleMav
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- Jul 22, 2023
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can someone repost please? Grazie 1000!
gazYar
Obsessed member
I am selling my built-up gearbox with the CUSCO synchro hubs, with revised toyota input shaft and brass forks. Anyone interested feel free to DM me.
TheManWithTheStick
Obsessed member
