Alright alright, so lets say that translates to a 5% larger radiator area? In other words it will delay the time it takes to hit limp mode by a few corners on a hot day on track. Compare that to what is actually needed, which is more like 50-60% additional radiator area depending on the weather, power and track. This based on what BMW did with the S55. My only point is that the performance to cost ratio is super low with that CSF radiator, and it is not the first time we hear about it leaking.
And btw, isnt Tyspeed sponsored by CSF? Do you have data that his car is no longer overheating? I know he did a lot of cool aero stuff, but when I checked around two years ago his CSF + 2x s55 aux cooler setup was still hitting above 110C on track.
It is more than 5% because every fin on the radiator has been louvered and fin density has been increased, so that + the fact that the radiator has fins all the way through its thickness surface area increase is likely in the ~20% likely greater range. Also any surface area or heat exchange area increase helps with total heat transfer effectively meaning peak temperatures will be lower at every situation, the increased volume is what "delays" limp mode for a few extra corners.
Yes tyspeed is sponsored by CSF leading to the development of their race spec radiator (a thicker radiator) which was the only thing capable of solving his over heating issue. Yes temperatures are still near limp mode, but keep in mind he is pushing 500 whp. The data is from his track videos from his youtube and instagram, he used to have alot more data before deleting alot of his videos. With the street spec it would be at limp mode temperatures of over heating, compared to the stock radiator which he used before hand there was an improvement.
But the final iteration to push temperatures even further below limp mode was water sprayers and that was so effective it helped even in super high elevations of pikes peak. Overall yes the CSF radiator helped but was still near limp mode until the water sprayers.
Now non tyspeed m2's:
1) Paradoxicalm2 (the owner of radenso radar - a super brilliant guy): His car was used to develop the CSF cooling suite, literally everything was based off of his car. His data showed on a modded m2 it would hit limp mode on a hot summer day, after the csf radiator the coolant temperatures would now be under control. And this is the street spec radiator (the race spec was designed off of tyspeed's car). he has since sold his m2 so it is no more.
2) Zm2 the current benchmark for a fast driver who is reaching the thermal limits of his m2. With his CSF radiator and new tuning techniques he is able to push 450 whp and 500 wtq for endless laps at a maximum temperature of 250F which is limp mode. He is still working on it and we believe with the new high ethanol content (keeps cylinder temps cool) tune and intercooler iats will be low enough to keep egts under controlled to the point where he will have coolant temperatures under limp mode for the entirety of the track session. So yes his CSF radiator seems to be working to keep coolant temps under control as well. Note before hand even with a dinan stage 4 tune he was over heating the stock radiator, and dinan stage 4 is only 375 whp.
Note the m2 and all F series n55's has an oil to coolant heat exchanger which means the coolant temperatures are sacrificed to cool oil temps, so this version of the n55 will always struggle with coolant temperatures while this heat exchanger remains.
That's what I see so far, and it shows the CSF radiator does work. In terms of leaks I have never seen any one on the m2 platform report that.