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-   -   325is brake upgrade? (http://www.318ti.org/forum/showthread.php?t=5134)

lkwd318ti 04-10-2005 11:24 PM

325is brake upgrade?
 
Hey everybody,
I was thinking about getting 4 rotors and calipers off a 325is.
Do you guys know if it's a bolt on upgrade, or do i need to modify a few things?
I know that 2ndBimmer has a 325i brake upgrade on his car.
Is there a difference between 325i and 325is brakes?
I assume that there isn't any, but just wanna make sure.
Finally, do you guys think that the rear brakes will fit onto our cars?
Thanks guys
-Randy

1996 328ti 04-11-2005 12:14 AM

Front will bolt up. The rears won't fit.

There is no difference between 325i/s or 328 i/s.

GDB 04-11-2005 12:43 AM

I believe the E46 32X rear rotor/caliper combo will work on the rear.

cali-ti 04-11-2005 02:00 AM

GDB, someone posted that at some point, i asked for more details and/or if anyone had done it and heard nothing. do we have proof that this works or is it only speculation at this point? because if it works, i think we'd have a good number of people who'd be willing to do it (vented rotors and all would be nice in the back). i HOPE it's true, i'd just like to know for sure :)

GDB 04-11-2005 04:32 AM

Several people have done it to regular E36s, so I see no reason that it would not work on the ti.

cali-ti 04-11-2005 04:49 AM

unfortunately, our rear is not the same as a regular e36, brakes aren't the same. if you know of someone who's done it though, i'd certainly like to hear details.

lkwd318ti 04-11-2005 06:18 AM

Okay cool, thanks guys. Do you guys think that it would be wise to put 325is brakes on the front and M roadster brakes on the rear (first of all, do they fit?)?
I need new brakes, so i figured "I might as well upgrade" haha
Thanks again guys
-Randy

cali-ti 04-11-2005 06:26 AM

M roadster or MZ3 rear brakes will not fit without the trailing arms (hub is different ... ask J!m for details as i'm going on what he has stated before). if you're getting the trailing arms, then you might as well get the whole subframe from the M donor and then you're looking at a whole lot more than a brake job :) since i'm not autocrossing or racing mine, i am planning to just do the 325/8 fronts and stock rears (calipers are at the powdercoaters now). even if you could put the M versions on the back, i would think you'd want to put the M versions on the front (need the M spindles, M calipers, M rotors, appropriate pads ...).

1996 328ti 04-11-2005 01:17 PM

Quote:

Originally Posted by lkwd318ti
Okay cool, thanks guys. Do you guys think that it would be wise to put 325is brakes on the front and M roadster brakes on the rear (first of all, do they fit?)?
I need new brakes, so i figured "I might as well upgrade" haha
Thanks again guys
-Randy

Not on a 138hp ti.
I can tell you that vented rotors up front and the stock solid rotors in the rear have performed very well at the track. I think one needs to be careful about mixing brake setups. I'd be concerned about brake bias. BMW engineers know a thing or two about brakes.

aceyx 04-11-2005 02:40 PM

i think the last thing you want is your rear tires to lock up before your fronts. i think the last thing you want is your rear tires to lock up at all.

i can superglue a chair to my arse, but just because i can, doesn't mean it's a good idea.

lkwd318ti 04-11-2005 06:35 PM

Quote:

Originally Posted by aceyx
i think the last thing you want is your rear tires to lock up before your fronts. i think the last thing you want is your rear tires to lock up at all.

i can superglue a chair to my arse, but just because i can, doesn't mean it's a good idea.

I was just thinking about that too. I wouldn't want to have the rears lock up haha.
I think I might just go and put the vented rotors on front and keep the solid ones on the rear.
Thanks again
-Randy

pdxmotorhead 04-11-2005 08:34 PM

One of the race cars I take care of (87 Nissan turbo) has VERY similar
brakes to the 318(Size and caliper arrangement.).
It goes through about 5 sets of front pads to each
set of rear pads. Its a 2600 lb car and even with 900 lb springs in front
under hard braking you can't add much bias to the rear without locking
a wheel. And yes its bad if the rear locks first.... Wheeeeee spin wheeeeee

Dave

aceyx 04-11-2005 08:46 PM

Quote:

Originally Posted by lkwd318ti
I was just thinking about that too.

trust me on this, superglue takes forever to get off. :biggrin:

Drew325ti 04-11-2005 08:53 PM

I am running cross drilled 325i/is rotors and calipers up front and stock 318ti rears. Stainless steal lines and Super Blue fluid were also added in the upgrade list... and I have plenty of brakes (even with out ABS).

lkwd318ti 04-12-2005 04:51 AM

So you guys think that it will be okay to put 325is brakes on the front and keep the stock ones on the back?
From what I've observed, I assume that that it's okay to put stronger brakes on the front and keep the regular ones on the back, or keep them equal to each other...and...it's bad to have stronger brakes on the rear. Is this right?
Also, I guess that it's hard (or impossible) to put the rear 325is rotors on...
Is that right also?
Thanks again guys,
Randy


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