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IS Gearbox
Posted: Mon Mar 09, 2009 7:52 pm
by MarkT
Probably been asked before but the search function isn't the best on here...
How much torque/power will the IS gearbox take? Is it simmilar in design/construction to the 325 boxes?
Re: IS Gearbox
Posted: Mon Mar 09, 2009 8:43 pm
by Bob_S
239bhp
Re: IS Gearbox
Posted: Tue Mar 10, 2009 9:05 am
by MarkT
Cheers bob, is that the point at which you've broken one or what your currently running through it?
Re: IS Gearbox
Posted: Wed Mar 11, 2009 8:40 am
by Bob_S
It's going off hearsay that the rule of thumb is that the size of the box is relative to the power you can push through it
Re: IS Gearbox
Posted: Wed Mar 11, 2009 9:27 am
by Theo
That is nonsense though.
Re: IS Gearbox
Posted: Wed Mar 11, 2009 10:06 am
by Bob_S
seems ok on my b28 though so to a certain extent there is truth in it
Re: IS Gearbox
Posted: Wed Mar 11, 2009 10:12 am
by Theo
I think torque is a more important factor than power here mate.
Does this mean that an M3 gearbox (getrag 265) can only take 265 ft/lbs? Even though there are countless people running huge torque through them?
It's internet bollocks!
Re: IS Gearbox
Posted: Wed Mar 11, 2009 10:15 am
by Bob_S
M3 box is built to cope with it though.. were talking about an ordinary box which wasn't built with the same standards as an M box...
Re: IS Gearbox
Posted: Wed Mar 11, 2009 10:20 am
by Theo
Oh dear, never mind.
Re: IS Gearbox
Posted: Wed Mar 11, 2009 10:22 am
by Bob_S
Theo325 wrote:Oh dear, never mind.
lol
Re: IS Gearbox
Posted: Wed Mar 11, 2009 10:29 am
by jaistanley
LOL
Re: IS Gearbox
Posted: Wed Mar 11, 2009 3:23 pm
by mr_dink
Bob_S wrote:M3 box is built to cope with it though.. were talking about an ordinary box which wasn't built with the same standards as an M box...
Both Getrag boxes, a 240 on the IS and a 265 on the m3.
Look a similar size to me.
Are we saying that Getrag make the IS box out of cheese, or are we saying it should be able to handle nearly as much torque as an m3 one?
Re: IS Gearbox
Posted: Wed Mar 11, 2009 9:56 pm
by MarkT
well thats as clear as mud lol.
Any other takers on this one?
Re: IS Gearbox
Posted: Wed Mar 11, 2009 10:12 pm
by richard-the-nutter
what engine are you planning on fitting to it, and how much abuse are you planning on giving and do you expect reliability!
Re: IS Gearbox
Posted: Wed Mar 11, 2009 10:26 pm
by HarvyS
Only 1 way to find out!
Re: IS Gearbox
Posted: Thu Mar 12, 2009 8:18 pm
by MarkT
Basically thinking of putting something not BMW based in to an E30 and i'm debating what to use as a base car. I'd like to use a BM gearbox so I don't have to modify box mounts, transmision tunnel and prop shaft. I'd like to use a coupe for the styling, however the IS and the 325 have the larger struts and rear discs. I didn't really want to have to start swapping too much over and buy other parts.
The engine that i'll be using will be V8, have 350-400 ftlb of torque and an 8k rev limit on stock internals!
