2011 35i to 2011 35is non-obvious mechanical differences?

[nicknaz]

Originally Posted by army_men

im looking to retro fit and upgrade to 35is rear and bmw performance fronts for my 35i since i track the car more often now. trouble now is to find a good deal for them. this is in my opinion a budget upgrade to the 35i without going full ap or brembo bbks

What's your thought on the engine cooling? Interested on whether you are planning upgrades there.

[Hoa]

Originally Posted by army_men

im looking to retro fit and upgrade to 35is rear and bmw performance fronts for my 35i since i track the car more often now. trouble now is to find a good deal for them. this is in my opinion a budget upgrade to the 35i without going full ap or brembo bbks

bmw performance is smaller than 35is brakes so you might want to reconsider unless you just want the looks then thats different

[army_men]

Originally Posted by nicknaz

What's your thought on the engine cooling? Interested on whether you are planning upgrades there.

not high on the list for me yet. I haven't ran into over heating problems or limp modes. and track sessions at mosport are kept short enough for the car to have a consistent oil temp under 120 degree Celsius. and enough time to cool down between sessions.

I'm not sure if 35is has a better oil cooler or not. anyone can jump in on that? 35i does have a decent oil cooler off to the passenger side front vent.

[army_men]

Originally Posted by Hoa

bmw performance is smaller than 35is brakes so you might want to reconsider unless you just want the looks then thats different

Yea it is smaller. and people have made comparison that it's about the same stopping power. I'm debating at this point because I haven't seen anyone retrofit the 35is brakes for the 35i yet. but i have seen the performance brakes done for the 35i. My understanding is that I can upgrade the pad on the performance brakes to ferodo pads, and perhaps get better brake lines and slotted rotors.

But so far my research haven't been conclusive. I'm not 100% sure I can even find pads and rotors for the performance brakes. or if its a better idea to just retrofit 35is brakes. and later do pads and rotor upgrade on that.

lots of questions here.

[nicknaz]

[QUOTE=army_men;13983559]

realoem.com suggests 35is has same cooling as 35i (600W radiator and no auxiliary radiator)

[Hoa]

our cooling system sucks. one time i drove the car at 120mph for 12 miles then back to normal. when the oil cools down, the car was telling me to add in 1qt of oil. i guess it burnt all that oil in a 6-7mins :/

the brakes, just use better pads, ss lines and vavoline oil to increase boiling point. after that, real bbk in needed for you

[z4z4z4]

http://brakeperformance.com/brake-ro...ake-Rotors.php

my 35i will get the 30i option soon. one member here likes his rear slotted option he bought from this vendor to compliment his BBK fronts.

[SgtGigglebox]

Originally Posted by z4z4z4

http://brakeperformance.com/brake-ro...ake-Rotors.php

my 35i will get the 30i option soon. one member here likes his rear slotted option he bought from this vendor to compliment his BBK fronts.

The link wasn't working, so I poked around a bit and I think I found the intended page:

[nicknaz]

pretty sketchy marketing claim that the grooves enhance stopping power.

More like, grooves let you remove mud and crud and allow you to stop. Good stuff for rally prepped STi/EVO but pretty irrelevant for Z4

[z4z4z4]

Originally Posted by nicknaz

pretty sketchy marketing claim that the grooves enhance stopping power.

More like, grooves let you remove mud and crud and allow you to stop. Good stuff for rally prepped STi/EVO but pretty irrelevant for Z4

Your brake pads offgas during braking. This establishes a cushion between the pads and rotors to effect the equivalent of aqua planing. Grooves/slots provide a path for the boundary layer of gas to escape. You can read more description, I'm paraphrasing, on Tirerack.com.

[nicknaz]

Yea I'm not convinced. I don't think modern pads "out gas" and the quality control of oem tends to be far superior.

Check out this thread. http://www.e90post.com/forums/showthread.php?t=447998

[Stupenal]

doesnt the iS also have an external oil cooler plus the sport exhaust?