Hi, i have a 1994 wrx, with a TY752VB3AA just wondered if a TY752VB4AA would be ok to take 380bhp. Hoping for a reply as all the posts i have put up i haven't had one reply.

Cheers

 

No chance What torque ?

 

The engine wont take that power and the gearbox has no chance!

Tony

 

The gearbox will almost definitely break.

 

well the engine has been rebuilt and is fully forged. Whats the most i could get out of TY752VB4AA box.

 

about 310 bhp as this is weaker than the ty754. But even then its just a matter of time until it breaks.

 

Lol for how long anything c.300/300 and you're running into borrowed time IMHO

 

what standard 5 speed box do you recommend

 

get a late 5speed gear box that ends in AAA they will take a lot more power iv heard cars running upto 500bhp and they take the pain with good oil in

 

And ive seen standard 215bhp cars strip the gears on these too!

The only safe way is 6 speed or go for a PPG (though its not as strong as a 6 speed) or try scooby clinic as they do a hardened gearset/box but these are not cheap, your looking at 3.5+k, a 6 speed is 2.5 inc the rear diff.

Tony

 

so is a TY752VB4AA better than a TY752VB3AA?

 

The ratios in the B4AA are shorter than WRX of the same year, although not as short as the RA boxes. Mine was 4k+ at 80mph. With 380bhp, and assuming 1.4bar+, you wont have enough gearing to last a week !

 

oh right, i will have to sell the B4AA and get myself a later 5 speed. Cheers for the info

 

Where are you based I might be interested in a spare B4AA

 

The later 5 speeds (even the 2.5 wrx's) are not going to take silly ammounts of torque, it will just shred the cogs

Tony

 

What Tony says is right, if you are going for power, and ESPECIALLY if you intend to have more torque, budget for a 6-speed box.

The 5-speeds WILL break if you put a lot of torque through them, it's a matter of when, not if.