08-15-2018, 08:21 AM | #1 |
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N55 Extreme Engine Cooling
Hey guys.
We all know the packaging and cooling system shortcomings of the OG M2, vs the M2 Comp and S55. Altho, these shortcomings tend to not appear until you're really pushing the car on track. I'm running the Dinan Stage 4 setup (turbo, piggyback, Dinan IC) and CSF cooling pack (radiator, DCT, oil) and experienced some pretty high temps at my last track day. Max temps: Ambient - 107F IAT - 161F Oil - 266F Coolant - 253F This was an open track day and I was running with slicks, AP racing brakes, all the Stage 4 goodies, and pushing the car hard for 40min runs, so I'd say this is an extreme case for the M2. The car starts to pull power above 242F coolant and will go into emergency cooling mode around 257F coolant. I was getting significant power pulled, so I'm searching for more engine cooling capacity. CSF said they're working on a larger radiator, but it requires an AC delete due to the M2's packaging. Do you guys have any ideas or other solutions? Thanks. Last edited by ZM2; 08-15-2018 at 10:04 PM.. |
08-15-2018, 10:13 AM | #2 |
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Here’s a few options: https://f87.bimmerpost.com/forums/sh...452618&page=11
Any other thoughts out there? Thanks. |
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08-15-2018, 11:41 AM | #3 |
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Should really try ECU tune. Make more power with less boost. Engine will run cooler as well.
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08-15-2018, 07:18 PM | #4 |
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Have you also considered the installation of a a water methanol kit? Personally I've found it's help and made a difference in my neck of the temperate woods.
I've been running a 51/49 blend from by works and the car has been great especially during hot days.
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08-15-2018, 07:33 PM | #5 | |
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It’s definitely on my list to try once my warranty expires. At least I can get some coverage from Dinan for now if my engine decided to implode on one of my hot laps. |
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08-15-2018, 07:34 PM | #6 |
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This popped in my head, but I don’t know much about it. Do you have a good link so I can do some studying? Thanks.
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08-16-2018, 04:45 PM | #13 |
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Meth injection is a very fun upgrade. I use it myself.
But it won't help oil/coolant temps. Sounds like some hardware changes will need to be made. I'm now hesitant to run my car at the track with all these overheating issues being documented.....aren't M cars suppose to be "Track Ready". |
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08-16-2018, 05:53 PM | #14 |
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I'd try in that order
1- ECU tune with logs sent to tuner from your track évents, tuner need to tailor map specific for your needs. 2- Bigger intercooler Race VRSF maybe ? 3- Meth injection will cure all your problem buts its a more complicated solution
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08-16-2018, 06:33 PM | #15 | |
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I’m going to have to figure out how to remove more btu’s from the coolant loop. |
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08-16-2018, 06:35 PM | #16 | |
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08-16-2018, 06:37 PM | #18 |
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Meth will not help at all, if anything it makes engine hotter, because octane improves and IAT decreases so engine keeps pushing.
I myself did track on similar condition a few times, bigger turbo or stock. I believe the humidity was even higher in my area and heat index (feels like) is 122+F. There was no heat soak (oil, coolant, IAT) issue whatsoever, the needle stayed dead in the middle however hard I pushed. Only thing my brake was hot like hell, you can hardly stand next to it even after a cooling lap... The key to keep engine cool is 1) Less boost 2) Less back pressure 3) Richer afr (Dinan does that) 4) Higher timing ignition (helps EGT). I also suspect Dinan intercooler can be part of the root cause. I have no doubt it cools IAT well thanks to the dual core design. But the dual core 'block' the air moving thru so the radiators behind it gets less cooling as a result.
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Last edited by SeanWRT; 08-16-2018 at 11:04 PM.. |
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08-16-2018, 06:41 PM | #19 | |
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I’m also curious if a larger auxiliary radiator would help. |
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08-16-2018, 09:35 PM | #20 | |
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I still think a custom tune that keeps Boost/timing inside parameters that are controllable by the OP's cooling setup could work.
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08-16-2018, 10:57 PM | #21 | |
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Last time of HPDE, 100+F ambient temp + 70+% humidity, IAT maxed at 125~128F, pretty stable, in every 20min section. TBH I didn't do longer than 30min as you did, so I don't know what could happen. When you have enough cooling, you start to care about the rest - pressure loss, heat recovery and weight etc, then Wagner is the clear winner, at least for me. Bigger auxiliary radiator will help for sure. CSF cooling pack is a nice upgrade, though you have to factor in the weight penalty on the front.
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08-17-2018, 12:45 AM | #22 |
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But that's what most want to do lol
I completely agree with you. Am running the JB4 on Map3 (Methanol Map) And it pulled strong in 113 degree heat. But I've since decided to run the stock map and just use the injection to recoup the power that is lost through the crap 91 octane...stuff should be illegal! |
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