Gearbox options/experiences
#383
There would have to be enough interest from other customers, but its something we're open to exploring.
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#389
Several places list the gearsets in stock from england shipped new ~$2600. I have like 8 core 5 speeds and I can build a transmission myself.
4.778 ring and pinion from mazda comp is $475 in stock.
Other issue is I am currently totaly wiped out for racing budget cash.
#392
I might. your price is too high though.
Several places list the gearsets in stock from england shipped new ~$2600. I have like 8 core 5 speeds and I can build a transmission myself.
4.778 ring and pinion from mazda comp is $475 in stock.
Other issue is I am currently totaly wiped out for racing budget cash.
Several places list the gearsets in stock from england shipped new ~$2600. I have like 8 core 5 speeds and I can build a transmission myself.
4.778 ring and pinion from mazda comp is $475 in stock.
Other issue is I am currently totaly wiped out for racing budget cash.
#393
I might. your price is too high though.
Several places list the gearsets in stock from england shipped new ~$2600. I have like 8 core 5 speeds and I can build a transmission myself.
4.778 ring and pinion from mazda comp is $475 in stock.
Other issue is I am currently totaly wiped out for racing budget cash.
Several places list the gearsets in stock from england shipped new ~$2600. I have like 8 core 5 speeds and I can build a transmission myself.
4.778 ring and pinion from mazda comp is $475 in stock.
Other issue is I am currently totaly wiped out for racing budget cash.
#395
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Also, if you do it yourself, make sure to figure out what machining you need to do on the case. You need to clearance some spots inside the housing, and I don't know what they are. Advanced Autosports might tell you what needs doing (they've done it several times), but they might not.
And David is right. You need to order several hundred dollars worth of parts from MazdaComp($860) AND you will need to have the case Machined. On mine, buy the time I bought the gears, paid for shipping, ordered everything from MazdaComp and paid someone who is experienced installing Quaife gears in Miata gear boxes to do the machine work and install($560)...the total bill was $4,393.96
The Quaife install is not a "drop in" and IMHO it would be pretty stupid to put used shift forks which wear out VERY quickly, used syncro rings which wear and crack, used syncro springs which snap and used bearings out of a gear box which suffered a catastrophic failure like most all of yours have into a transmission you are building to last for several years.
I wouldn't let mine go for what David is asking for his....supply and demand..... I would be willing to bet David's is the only complete gear box WITH verifiable records as to the quality of the install....for sale in the US right now.
#396
For those interested, here are pictures of the aftermath:
Stripped and ready to confirm the bad news:
Missing tooth:
The tooth was broken off fairly cleanly:
How does tooth wear look, in general? If the broken gear is replaced, can the box be reused, do you think?
None of the long bolts had broken in the month or so since the clutch job, but apparently one was loose. There is also a crack starting to propagate near the shifter:
I thought long and hard about replacing it with another Quaife gearset. In the end, I decided that there are no solutions in the short-term and I don't want to be stranded come next spring. I think I'll turn the boost down for track days and look at the possibility of adding a cooler. Does anybody have any thoughts about how to reinforce the case, as it's obvious that it's a flexy-flier.
#398
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IMO, if the case is flexing/cracking that much then stronger gears will not be a huge leap forward towards a solution.
I'm wondering about a few things:
1) Case to case, is the six speed case itself any more resistant to flex than the five speed case?
2) Is any of the tailhousing area cracking shown above related to forces from the differential being transmitted through the PPF? If so, would isolation of the diff contribute any benefits?
3) If case flex is a possible contributing factor to gear failure in either the five or six speeds, would a case girdle or brace help to prevent gear failures? I ask because I have seen them previously on other makes of vehicles and they are an easier solution than a custom case or certain other remedies.
I'm wondering about a few things:
1) Case to case, is the six speed case itself any more resistant to flex than the five speed case?
2) Is any of the tailhousing area cracking shown above related to forces from the differential being transmitted through the PPF? If so, would isolation of the diff contribute any benefits?
3) If case flex is a possible contributing factor to gear failure in either the five or six speeds, would a case girdle or brace help to prevent gear failures? I ask because I have seen them previously on other makes of vehicles and they are an easier solution than a custom case or certain other remedies.
#400
Most of what can be seen in your pics is the coasting side of the teeth. The arrow I've added points to the drive side, and it looks pretty rough, at least in this glimpse. If the teeth on it look like this all the way around, and across, then that gear is iffy. It's a surface roughness that is making the gear engagement grabby as opposed to slippery, which is adding to the stress on the teeth. Do all of the gears look like that on he drive side? It is possible that only 4th looks like that, which helped lead to it failing.
Look for pitting as well. It will appear near the root of the tooth, and if there's more than a spot or two it will appear as a broken line of pits/dots across the width of the tooth.
I'd probably run the gearbox even if all the gears look a little smeared like that, but replace 4th as a set, not just the single one on the layshaft. And turn the power down a little, since you've already found the limit
Edit: What does your builder think about it? He's got a better feel for it than anyone else since it's on his bench.
Look for pitting as well. It will appear near the root of the tooth, and if there's more than a spot or two it will appear as a broken line of pits/dots across the width of the tooth.
I'd probably run the gearbox even if all the gears look a little smeared like that, but replace 4th as a set, not just the single one on the layshaft. And turn the power down a little, since you've already found the limit
Edit: What does your builder think about it? He's got a better feel for it than anyone else since it's on his bench.
Last edited by matthewdesigns; 09-25-2014 at 11:41 AM.