Strength of RS gearboxes

[funkytown]

fellow CS'er might buy my 1990 RS gearbox

They want to know if they are any stronger or weaker than factory BG (TT) 94-96 gearbox's

I suspect they are weaker but they asked me to post as they cant check CS during the day.

Someone who "knows" can you please comment, i can complete my sale or otherwise if i know.

Cheers

[Munkvy]

Ive broken a BC5 box or three from launching, and I always slip the clutch to some degree when launching so as to reduce shock loading. And I know of people who have broken them just changing through gears under boost (not flat shifting or anything).

I also have a BG5 and I have been raping that for over 3 years and not managed to break the box. Admittedly the cars only putting out 160wkw but I have drag raced it at Masterton and run it round Manfield, abused it at Targa as a safety vehicle, and competed at various sealed and unsealed autocrosses in Wellington. Yet to pop after 60,000km or so of me using it.

So from my experience I would say the BC5 boxes do seem weaker. However you should check the code on the box to make sure its actually a BC5 box, as given what else is on that car it may well have something else in it... Also I think alot of it comes down to how you treat it. If you flat shift or launch alot I would suggest not using an RS box, but then I would suggest if your doing that you want a dog box....

Im not sure what technically is different inside the boxes between BC5 and BG5 boxes, I assume Boostin, Ichi Ban or Koom could probably answer that?

[dubbedup]

i have chwed thru several bc5 boxes also and altho i cant comment on later model legacys i have a V1 wrx box with 200,000kms which has been abused and its still holding in there, (not by much atm tho - very noisy)

[funkytown]

thanks guys.

Its been offered out for $200 to the OP. They can make the decision on what to do.

[Munkvy]

 funkytown said:

thanks guys.

Its been offered out for $200 to the OP. They can make the decision on what to do.

Thats a very reasonable price, given WRX boxes are generally $400+

[funkytown]

 Munkvy']

[quote name='funkytown said:

thanks guys.

Its been offered out for $200 to the OP. They can make the decision on what to do.

/quote]

Thats a very reasonable price, given WRX boxes are generally $400+

yup its reasonably untested (feels ok for the short blat it got). It selects all the gears nicely enough and well i didnt get car for much..

Hence it can go as is and some one wins a gb for 200. Has a 4.111 rear end as well. i can sort a deal for all the bits.

[dubbedup]

yea $200 is a sweet price

[Guest]

same gearbox internals ( same teeth widths) minor variations in individual gear drive ratios , slightly differnet transfer drive

BC boxes are just older

[Guest keltik]

 Ichi Ban said:

same gearbox internals ( same teeth widths) minor variations in individual gear drive ratios , slightly differnet transfer drive

BC boxes are just older

Exactly what i wanted to know. Legend.

[Guest]

Is this topic about you finally sorting out your whiny gearbox keltik?

[Munkvy]

 Ichi Ban said:

same gearbox internals ( same teeth widths) minor variations in individual gear drive ratios , slightly differnet transfer drive

BC boxes are just older

Awesome, thanks for that much appreciated!

Any idea when the internals actually went to something stronger? As my V3 box for example seems much stronger given it gets alot more abuse and has yet to explode.

[Guest keltik]

Yes. However there has been a slight change of plan. Will be running the current g/b untill it literally explodes THEN changing to whatever ive got by that point.

[Munkvy]

 keltik said:

Yes. However there has been a slight change of plan. Will be running the current g/b untill it literally explodes THEN changing to whatever ive got by that point.

So time for some limiter side steps off the clutch at MM then? I will bring the video camera and help you swap boxes in the pits....

[Guest keltik]

Sounds like a plan my friend If MM doesnt kill it, ill see how it likes to handle my small power upgrade in a couple months time