Hya,

I have a 1994 wrx import could anybody tell me what the maximum bhp I can go for before braking the gearbox and diff.

Thankyou mark

 

Life sort of depends upon mileage so far and previous use and service history.

As a general rule of thumb 350 hp would be a safe maximum But it is torque that kills boxes, not power. Probably safer to say 330 ft lbs at that car age.

David APi

 

Mine has just gone, twice and car is 332lbft, what can i do to get it reliable as want to take it to the ring next year and enjoy trackdays without worrying about it.

 

hi ive got the same prob with my 94 sti it eats gearboxes and i think its only got about 300bhp ish so if you find a reliable result let me know please as im sick of fitting new boxes. 4 in 2years

 

A PPG box is what you need. Run 700bhp on the drag strip all year

Gearset........................................... ............Price

Subaru WRX 5sp 4 gear str-cut (syncro)...........£2,372.37
Subaru WRX 5sp 4 gear helical (syncro)............£2,372.37
Subaru WRX 1st & 2nd str-cut (syncro)............£1,392.89
Subaru WRX 1st & 2nd helical (syncro).............£1,392.89
Subaru WRX 3rd & 4th str-cut (syncro)............£1,101.69
Subaru WRX 3rd & 4th helical (syncro) .............£1,101.69

Subaru WRX 6sp Dog Group N.........................£5,946.17
Subaru WRX 6sp Dog Group N (5gear set).........£5,416.72
Subaru WRX 6sp, 4 gear DRAG (dog box)..........£3,722.47
Subaru WRX 5sp Dog Group N.........................£4,807.85
Subaru WRX 5sp 4 Gear str-cut (dog box).........£2,954.77
Subaru WRX 5sp 4 Gear helical (dog box)..........£3,060.66
Subaru WRX 1/2 str-cut (dog box)...................£1,710.56
Subaru WRX 1/2 helical (dog box)....................£1,710.56
Subaru WRX 3/4 str-cut (dog box)...................£1,366.41
Subaru WRX 3/4 helical (dog box)....................£1,472.30

Subaru WRX 1/2 Billet Selector fork (5sp).........£307.51
Subaru WRX 3/4 Billet Selector fork (5sp).........£307.51
Subaru WRX 5/R Billet Selector fork (5sp).........£386.93
Subaru WRX Interlocker (5sp).........................£439.87
Subaru WRX LSD (front) (5sp)........................£863.43
Subaru WRX LSD (centre) (5sp) (99 on)...........£1,075.21
Subaru WRX 1/2 Billet Selector fork (6sp)..........£333.98
Subaru WRX 3/4 Billet Selector fork (6sp)..........£333.98
Subaru WRX 5 spd RWD Conversion Spools (99 on).£402.81
Subaru WRX 6 spd RWD Conversion Spools.........£402.81
Subaru WRX Bronze Speedo Gear......................£185.73
Subaru WRX 3rd/4th & 5th/Rev Billet Syncro Hubs..£254.56


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