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      06-17-2018, 04:12 AM   #1
opposer
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Does m235i have overheating issues on track?2

Posted in 1addicts first, then decided that 2 owners track more often

I'm planning to buy m135i but afaik, m135i and m235i are basically same cars. So here's question.


Heard that n55 is very "hot' - operates on high-temp coolant and oil. Does m135i survive 15-min track sessions without overheating? My BRZ holds very well, planning to switch to m135i next year.

I'm from Russia and most m135i's are with AT and AWD, so i'll have to buy AT and AWD. Planning to attend trackdays occasionally.

I'm asking about stock engine firmware - no stages etc.

Will bimmer survive rare track abuse? Oil overheat? Coolant? Transmission?

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      06-17-2018, 08:59 AM   #2
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they are very different cars tbh. Both are small and nimble, but drive each b2b.

Lets focus on the 235, car in stock form can handle track days without any problems. 244f oil all day no problem which sits right in the middle of the gauges in other series.

Tranny will be fine as long as you know how to drive and keep it under 550 whp.
Dont worry about firmware. Buy yourself a drop in filter, charge pipe kit, n20 spark plugs gap to .18, a cattless down pipe, and a intercooler. than buy yourself the BM3 dme flash.

Next would be stainless steel lines and brake pads, i reccomend ebc yellow stuff. motul 600 fluid for street, and swap pads for pfc08 for serious track days.

Your going to want some negative camber upfront, so look into your options on camber plates or bolts etc. Get some dinan springs and the handling kit ( 5 series bumpstops).

I run -2.7 up front and -2.1 back.

this alone should spend all your money and get you right around 400whp. paka
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      06-18-2018, 07:44 PM   #3
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the F20 M135i should essentially be the m235 but with a hatch, unless I've missed something?

No overheating issues with the engine, per say, but if tracking the OEM pads/fluid will show you their weaknesses very quickly. Engine heat soak is real, a FMIC will aid in keeping your IAT's down while giving the car no mercy. Aside from that, just your basic turbo car bolt ons is all you "need", track pads/tires is going to make the biggest difference to your experience, imo.
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      06-20-2018, 12:15 PM   #4
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Quote:
Originally Posted by Dylan86 View Post
Engine heat soak is real, a FMIC will aid in keeping your IAT's down while giving the car no mercy. A.
You mean that car needs additional cooler for AT liquid? What FMIC do you mean? Aftermarket?
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      06-20-2018, 03:11 PM   #5
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Quote:
Originally Posted by opposer View Post
You mean that car needs additional cooler for AT liquid? What FMIC do you mean? Aftermarket?
No, it shouldn't require an additional trans cooler. As far as I know, the 8AT's are very good with track duty. It's the same gearbox that is in the M235iR.

The FMIC would help reduce IAT's and keep them more consistent. This is to help reduce engine Air Intake Temperature.

D
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      06-21-2018, 12:54 PM   #6
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The iR actually has a front mounted radiator for added cooling. It shares this part with the m2. The regular m235i and m240i have a heat exchanger next to the trans.

And yes, I do believe there to be an issue with the trans getting too hot. It will occasionally upshift a few gears without warning if it gets a bit hot.
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      06-22-2018, 02:03 PM   #7
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Quote:
Originally Posted by capt_and View Post
The iR actually has a front mounted radiator for added cooling. It shares this part with the m2. The regular m235i and m240i have a heat exchanger next to the trans.

And yes, I do believe there to be an issue with the trans getting too hot. It will occasionally upshift a few gears without warning if it gets a bit hot.
does this radiator fit m135i plug and play?
will the awd tranny overheat during 15min track session on a stock tune (320hp)?
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      06-22-2018, 02:05 PM   #8
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Quote:
Originally Posted by bryan_f22 View Post
they are very different cars tbh. Both are small and nimble, but drive each b2b.


this alone should spend all your money and get you right around 400whp. paka
how reliable is that config? What mileage do 400whp cars have on this forum?
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      06-23-2018, 09:11 AM   #9
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what about oil starvation in turns? Does it need upgraded oil pan, oil pump etc?
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      06-23-2018, 11:14 AM   #10
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"Need" for any of this seems like a strong term for 15min track sessions - you could probably get away w/ all stock for a long time. Search will be your friend - http://www.2addicts.com/forums/showthread.php?t=1474653 and http://www.2addicts.com/forums/showthread.php?t=1499692 these have other considerations for tracking.
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      06-23-2018, 12:52 PM   #11
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does anybody track mx35 xdrive? how does the tranny hold up"?
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      06-23-2018, 05:45 PM   #12
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Quote:
Originally Posted by opposer View Post
how reliable is that config? What mileage do 400whp cars have on this forum?
100% reliable, 40k miles.
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      06-23-2018, 05:46 PM   #13
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Quote:
Originally Posted by opposer View Post
does anybody track mx35 xdrive? how does the tranny hold up"?
fantastic other than the understeer, front tire rolling.
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      06-24-2018, 07:51 AM   #14
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Quote:
Originally Posted by bryan_f22 View Post
fantastic other than the understeer, front tire rolling.
no overheating problems then?
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      06-25-2018, 08:40 AM   #15
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i have not experienced any overheating even during 98f track days.
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      06-25-2018, 12:38 PM   #16
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Quote:
Originally Posted by opposer View Post
does this radiator fit m135i plug and play?
will the awd tranny overheat during 15min track session on a stock tune (320hp)?
I have no idea when it comes to the m135i. You'll need to look through all of the parts available through realoem. I also can't say if the tranny will overheat since I have no experience with your configuration. With all that being said, if you are a beginner, the odds of you overheating anything is relatively low. If you do overheat, the car has several measures to warn you or stop the overheating before damage occurs. And finally, if you are really concerned, I would go buy a data logging system like the AIM Solo DL and connect it to your CAN. Using that, you will have access to all of your vitals.
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      07-10-2018, 09:12 PM   #17
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No overheating here on a really hot day last sunday, M235i Xdrive with RE71r not babied at all.

Gulf R1000 fluid + OEM brakes (had to relax a couple of times) held up great but near end of there life discs+pads.

OEM Suspension with hotter exterior side of tires because not enaugh camber but these tires held up nice and will be good for a couple more events with a re-mount on the other side.

Transmission no problems at all, always Shifted great.

Only complaint is power did not seem consistant, like sometimes it pulled timing some times it was Ok, I did not log but will try to do it next time, and maybe even try better fuel.

Debating between keeping it simple with dinan springs or going KW V3 for a nice compromise
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      09-05-2018, 10:55 AM   #18
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Just did a track day. 90F and oil temps went no higher than 246F and it was a blip. Rock steady at 240F.
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      09-08-2018, 02:16 PM   #19
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2014 BMW M235i  [0.00]
BMW solved the overheating problem with the N55 engine. I used to have the problem in my E90 335i with the N54 engine. No overheating issues in my old N55 E90 335i, or my old 235i both with the N55 engine. Also no issues in my M2.
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      09-09-2018, 06:39 AM   #20
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I'd say either car is a great car but my preference would be the N55 over the N54. BMW seemed to learn a lot from N54 mistakes. The good news on the N54/135i? Most of what can go wrong with it is easily found using Google.

Some items to look for on the N54. Bad high pressure fuel pumps and issues with wastegate control solenoids for the car's turbos along with the wastegate itself. Replacing solenoids is a relatively easy fix. If the wastegate fails, that's a much, much bigger problem as the entire turbo will need to be replaced. Some opt just to use a different turbo at that point since it's going to take two solid days of work to swap out turbos. As labour will exceed part costs by a significant margin, might as well put in better turbos.

If you really want that 135, there are lots of N54 owners out there and some really love the engine as a tuner engine but I'd do a lot of research on it to get a realistic idea of how much money you'll need to fix any issues.
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      09-09-2018, 01:16 PM   #21
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N54 was developed in a hurry to compete with Japanese's 300hp+ NA engines.
That's why it has major issues.

N55 was lesson learned version of N54. So it is much more reliable.

B58 is a different animal. Clean sheet design with a lot of development time(and money). Architecture is meant to be shared with other engines to lower the development cost. Which means, they could put way more R&D effort.

I kinda suspect that B series engine could be the last of IC engine BMW develops.
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