Bugeye01WRX

Safe Horsepower Limit on stock 5 speed?

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On 16/10/2020 at 8:43 AM, madmike said:

The torque would be the biggest killer for you.. 

It's really an unknown as to it lasting or not..

 

 

Cheers

Working with the team at Wellington Automotive Gearboxes on options,

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I broke one 5spd gearbox in about 7 years of very regular absolute death (launches, helis, clutch dumps, extended 8000+ rpm, you name it). Probably running in the order of 170/180 proper kilowatts. So that's AT LEAST a safe horsepower limit on a stock 5spd =]

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Randomly found a video on the 5 speed and the guy in he USA who rebuilt 1000’s says the gear break as they are too thin for increased torque. 

the 2014 6 speed from the WRX is apparently basically a 5 speed sized gear and breaks the same. 
 

they replace the gear sets and have little to no issues. 
so stronger gear material is worth it compared to rebuilds or replacing the gearbox over and over. 

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