[F87source]

Originally Posted by ZM2

F87source Agreed all this would help fix engine cooling for those of us pushing more power, especially with something like the Pure 800 (thread namesake). Altho, I’m not willing to do most of it.

Could you clarify your statement below? Are you asking me to cut off my lovely M2 bumper fangs, or remove some ducting behind the bumper? I did leave the two duct/scoops on the aux radiator and oil cooler bc I figured it helped channel/speed air across them.

“I too agree the m2c bumper will help with aux rad cooling, but you can just remove the lower side fender ducts on the og m2 and then you get gigantic openings directly to the radiator, so you can do that if you don't want to buy a new bumper.”

Yeah sorry op for thread jacking my bad. The pure 800 is pretty dope though and is an alternative to the VTT stock location and stock part style turbos.


Yes of course, let me clarify. So if you look here:
1) Bmw front bumper: https://www.realoem.com/bmw/enUS/sho...diagId=51_9906
2) image of the bumper: https://www.ecstuning.com/b-genuine-...r/51118068533/

Look how large those aux radiator holes are, they are absolutely massive.

Now bmw in their infinte wisdom decided that ///M cars for whatever reason didn't need all of this air flow and put in these ducts that clip into the bumper and as a result narrow down the inlet size down to this tiny little hole.

1) https://www.realoem.com/bmw/enUS/sho...diagId=51_9909
2) https://www.ecstuning.com/b-genuine-...t/51118067021/
3) https://www.ebay.com/itm/NEW-OUTER-B...-/283365138854

So what I suggest is to remove these clip on "ducts" which will give you a massive inlet area. Then make custom ducts that go to the radiator, you can use kydex (this was super popular for air box diy's in the subaru world) or if a mechanical engineer here could make us a 3D printable model do that. Then cover the inlet with mesh to protect it from rocks. Boom you have a super high air flow front bumper without having to buy the m2C bumper and repaint it, you also keep your OG m2 aesthetics. Leave the smaller ducts on the radiator in tact.

These are the aux rad air ducts you should leave alone:
1) https://www.ecstuning.com/b-genuine-...r/51748064145/
2) https://www.realoem.com/bmw/enUS/sho...diagId=51_8574
(item 4 on real oem).

Hope this helped, I thought I mentioned this to you earlier lol guess I forgot - sometimes I forget because I have a huge spread sheet with ideas and theorys for my m2 planned out (the scientist side of me lol) before I do anything (minimises mistakes and ensures I only have to do things once) so sometimes I forget if I shared ideas or not.

[ZM2]

To summarize, just remove #2 from both sides?: https://www.realoem.com/bmw/enUS/sho...diagId=51_9909 I think those are primarily bumper cover supports. IDK if my bumper or fangs would start to bend and crack paint at 140mph+ without them? You already remove the center bumper cover foam support for the Evo3 install.

You also remove larger radiator duct items here when the Evo3 goes on https://www.realoem.com/bmw/enUS/sho...diagId=51_8574 and the fit is so damn tight b/n the bumper mount support bar, Evo3, radiator, and CSF DCT cooler I'm not sure there's a way to make effective additional radiator airflow ducting. The CSF DCT cooler sits right on top of the Evo3 and there's less than 1/2" between the Evo3 and the radiator.

Check out some of the pics below from GerardzM Evo3 install, and he has the stock DCT cooler.

[F87source]

Originally Posted by ZM2

To summarize, just remove #2 from both sides?: https://www.realoem.com/bmw/enUS/sho...diagId=51_9909 I think those are primarily bumper cover supports. IDK if my bumper or fangs would start to bend and crack paint at 140mph+ without them? You already remove the center bumper cover foam support for the Evo3 install.

You also remove larger radiator duct items here when the Evo3 goes on https://www.realoem.com/bmw/enUS/sho...diagId=51_8574 and the fit is so damn tight b/n the bumper mount support bar, Evo3, radiator, and CSF DCT cooler I'm not sure there's a way to make effective additional radiator airflow ducting. The CSF DCT cooler sits right on top of the Evo3 and there's less than 1/2" between the Evo3 and the radiator.

Check out some of the pics below from GerardzM Evo3 install, and he has the stock DCT cooler.

It would be up to you if you wanted to try, but if you removed #2 from both sides the oil cooler and the aux radiator would get alot more air flow, it would even exceed the m2C's aux rad air flow. This would help if you were going to retrofit larger aux radiators like what cookie suggested.

But yes it would weaken the front bumper, hence why you would have to make ducts to help support the front bumper. Another option would be to modify that duct to enlarge it, then the side supports for the "aero curtain" that vents into the wheel well would still be intact helping to reinforce the fangs. My personal plan was to delete all of this and use 3D printing in conjunction with kydex to make a surround that supports the bumper and having air duct through to the radiators. Not an easy task but yeah...


For the main radiator with an intercooler that large you don't have an option for ducting, it would just be for the side aux radiator and oil cooler where you would be concerned with making ducts for if you choose to delete those surrounds.

[cookiesowns]

F87source don't forget the M2C has 2 beefy AUX radiators, not 1! the OG N55 only has one smaller Aux.

You can really tell the OG M2 taking the N55 was really a cost saving measure now that I think about it. It shares most if not the same cooling components as the M235i.

I bet with just both Aux rads in place we'll get a good amount of BTU's worth of cooling back.

Time to get searching for a salvage 6MT M2..

[ZM2]

Happy to get my shop to open up the aux radiator airflow section and mount up a custom larger aux radiator if we can figure out a good cooler for the job.

Getting a larger radiator in the car is going to be a huge PITA, but if we maximize airflow as F87source mentioned and get a larger aux cooler than aftermarket up there, maybe that’s a good enough solution.

[F87source]

Originally Posted by cookiesowns

F87source don't forget the M2C has 2 beefy AUX radiators, not 1! the OG N55 only has one smaller Aux.

You can really tell the OG M2 taking the N55 was really a cost saving measure now that I think about it. It shares most if not the same cooling components as the M235i.

I bet with just both Aux rads in place we'll get a good amount of BTU's worth of cooling back.

Time to get searching for a salvage 6MT M2..

Yes I know that, but 1 of the aux rads on the S55 is for the intercooler so not really 2 aux rads.


Yeah I kind of wish the m2 came with the S55 from the beginning, not really too disappointed since it is a really good package. In terms of factory cooling, I don't fault bmw on that either because it is sufficent for stock power. You can't really expect bmw to engineer it for more cooling than what it requires for the factory power levels.


But yes I also wanted to go dual aux rads - likely the m2c ones will be bolt ons, and then a larger oil cooler where a dct cooler would be.


Haha hopefully you can get an m2 and help us on this mission.

[F87source]

Originally Posted by ZM2

Happy to get my shop to open up the aux radiator airflow section and mount up a custom larger aux radiator if we can figure out a good cooler for the job.

Getting a larger radiator in the car is going to be a huge PITA, but if we maximize airflow as F87source mentioned and get a larger aux cooler than aftermarket up there, maybe that’s a good enough solution.

I was thinking about either retrofitting an S55 aux rad, or mishimoto's camaro ss aux rad upgrade because dimensions are really close to the upgraded s55 aux rads that cr racing sells.

But imo I do not think a larger aux rad is gonna be enough on its own.

[F87source]

Originally Posted by ZM2

Happy to get my shop to open up the aux radiator airflow section and mount up a custom larger aux radiator if we can figure out a good cooler for the job.

Getting a larger radiator in the car is going to be a huge PITA, but if we maximize airflow as F87source mentioned and get a larger aux cooler than aftermarket up there, maybe that’s a good enough solution.

One more thing, the aux rad flows through the best exchanger to help cool oil temps, so imo the largest gains is disconnecting that heat exchanger. But be aware oil temps can spike if you do that.

[cookiesowns]

Originally Posted by F87source

Yes I know that, but 1 of the aux rads on the S55 is for the intercooler so not really 2 aux rads.


Yeah I kind of wish the m2 came with the S55 from the beginning, not really too disappointed since it is a really good package. In terms of factory cooling, I don't fault bmw on that either because it is sufficent for stock power. You can't really expect bmw to engineer it for more cooling than what it requires for the factory power levels.


But yes I also wanted to go dual aux rads - likely the m2c ones will be bolt ons, and then a larger oil cooler where a dct cooler would be.


Haha hopefully you can get an m2 and help us on this mission.

bleh i need to just stop blindly looking at realoem and instead defer to technical docs and ista, or going by memory.

You are correct.

I still think getting two aux rads, even with just 1 passing in front of the oil hx will probably be good.

[TACP]

Has there been any new news on this turbo for the N55?

[Wheats1]

It's a nogo until they get their casting issues sorted out. Probably another 6 months.

[TACP]

Originally Posted by Wheats1

It's a nogo until they get their casting issues sorted out. Probably another 6 months.

Please forgive my stupidity, but can you go into more detail on what this means? What issues are they having, what is casting?

[M Fifty]

Originally Posted by TACP

Please forgive my stupidity, but can you go into more detail on what this means? What issues are they having, what is casting?