how many people have 380 bhp or close on a classic box?
#35
To a first look, they clearly aren't the same (e.g. different ratios) but that doesn't mean they are stronger or not. I understand there aren't any obvious things that would make you stop and say, okay, those are stronger. But there are many ways to strengthen the gears that may not be obvious, changes to the tooth profile, changes to materials or hardening / treatments that don't necessarily stand out afterwards. You can call subaru up and ask them what processes they apply to different gearsets, but you won't get an answer
Probably the only way to check would be to buy some gearsets and then test them to destruction. Who wants a whip around to do that then
Last edited by Sprint Chief; 28 March 2012 at 09:15 AM. Reason: Fix badly worded text
#37
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Its not the bhp its the torque that kills them, as Sprint said, they vary, but they dont vary that much between the lot that one will do 300lbs and the other 400lbs, they will all be within a very close margin to eachother.
What dictates them breaking is what you should ask yourself, but most of those boxes have 100k miles on them, the "odd" crunch with a bad change and presto, broken, or if not, enough of a chunk off the cog to do damage over time.
The "ultimate" classic 5 speed gearset was meant to be the version 5/6 STI type RA's, it was "cryo" hardened (frozen in other words), how much better it made it is unknown, but you can only do so much with one design and similar materials.
Tony
What dictates them breaking is what you should ask yourself, but most of those boxes have 100k miles on them, the "odd" crunch with a bad change and presto, broken, or if not, enough of a chunk off the cog to do damage over time.
The "ultimate" classic 5 speed gearset was meant to be the version 5/6 STI type RA's, it was "cryo" hardened (frozen in other words), how much better it made it is unknown, but you can only do so much with one design and similar materials.
Tony
#38
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My v1 DCCD box lasted about 10k miles on 330/350 when I had a 257, quite a few trackdays, no launches. I got it rebuilt and did gentle miles whilst saving for a 6 speed.
I then sold it on and the next guy did about 60 miles at 330 Lbft and broke it
I then sold it on and the next guy did about 60 miles at 330 Lbft and broke it
#40
v1s/v2s are very weak and all of them are prone to breakage at low output. Even mild mods can lead to failure in fairly short order.
More evidence regarding the significant differences between gearsets can be found here:
http://rallispec.com/new%20catalog_gc8JDM.pdf
A complete parts catalogue from the US for all classic JDM impreza bits. Gearsets are on pg 24. Note the difference between the gearset prices.
V4 type RA - $1700
v6 STi - $1110
v6 type RA - $1500
Note that cryo treatment and "microfinishing" is an aftermarket add on offered by Rallispec not an official Subaru process (nobody outside of Subaru knows what Subaru does AFAIK).
These differences are important though because if people can happily run 400bhp-450bhp on the right 5 speed gearbox, then that offers massive cost savings to people looking to build a classic with this power output. Swapping a 5 speed is WAY easier than swapping a 6 speed in plus some competitive events require cars to retain the original castings so this information is valuable. These differences are worth having but need more research to figure out fully.
More evidence regarding the significant differences between gearsets can be found here:
http://rallispec.com/new%20catalog_gc8JDM.pdf
A complete parts catalogue from the US for all classic JDM impreza bits. Gearsets are on pg 24. Note the difference between the gearset prices.
V4 type RA - $1700
v6 STi - $1110
v6 type RA - $1500
Note that cryo treatment and "microfinishing" is an aftermarket add on offered by Rallispec not an official Subaru process (nobody outside of Subaru knows what Subaru does AFAIK).
These differences are important though because if people can happily run 400bhp-450bhp on the right 5 speed gearbox, then that offers massive cost savings to people looking to build a classic with this power output. Swapping a 5 speed is WAY easier than swapping a 6 speed in plus some competitive events require cars to retain the original castings so this information is valuable. These differences are worth having but need more research to figure out fully.
#43
STi 5 Type RA V-Ltd. Currently running a TD05-20g although may get an opportunity to bolt something a bit bigger for a short while, just to see what can be done on a budget
#46
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20g @ 384/349 on my STi 5's std c.48k old "TY754...AAA" 'box. New CC Stage 2 clutch/API lightened OEM flywheel (c.1k miles on it). No launching.
So far so good - no horrible noises/graunching gears/synchros, etc.
But re. crunching gearshifts: I accidentally did just that the other day (tw@t!)... So am hoping upon hope that isn't the start of a snowball effect....
So far so good - no horrible noises/graunching gears/synchros, etc.
But re. crunching gearshifts: I accidentally did just that the other day (tw@t!)... So am hoping upon hope that isn't the start of a snowball effect....
Last edited by joz8968; 29 March 2012 at 05:03 PM.
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