05-11-2020, 08:03 AM | #23 | ||
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The stock cooling system is designed for daily driving in mind, not racing. More specifically, the pump doesn't even turn on until it's needed. During normal driving, the coolant is just a giant heat sink. When you start a pull, you see the IATs drop initially. That's because the pump turns on and sends a surge of cold coolant through the IC. However, when doing a multiple gear pull, you'll see IATs begin to rise again. After the pull, the pump will only run until the IATs are within a range set by the DME (I believe no more than 20F over ambient). Also keep in mind that I'm in a unique situation on a custom tune that is pushing the stock turbo. So I see IATS drop briefly, then a 20+F rise in temps over a 40-140mph pull. It'll recover a bit after the pull, but temps are still elevated over ambient. So my 2nd pull starts at a higher temp, and ends at a higher temp. I didn't experience those characteristics on OTS maps. My goals/expectation with the bigger radiator are: 1. Increase the length of time that cool coolant is pushed through the IC during a pull 2. Decrease the peak IAT gain after a 100mph+ pull 3. Improve the system recovery after a pull I do get some timing pull. The way my tune is setup, it doesn't show as cylinder-specific timing corrections so I can't show that in my logs, but it does show overall adjustment. I'll also show curves that illustrate the rise in IATs when doing back to back pulls, and the IAT recovery when cruising/stopped. That being said, if you're hoping for any other gains or concerned about any other issues it could bring, let me know now so I can log before and after data. The cooler is arriving today so it should be installed by this weekend. |
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05-11-2020, 09:42 AM | #25 | |
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The only thing you can measure to evaluate IC performance is intake temps before and after the intercooler. |
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OzBMR574.50 |
05-11-2020, 10:36 PM | #26 |
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I updated my earlier post to clarify that the Coolant Temps are Engine Coolant, not intercooler coolant temps. I can delete the reference to the Engine Coolant Temps if you think they don't add any value.
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Tesla Model 3 Performance 0 - 60mph 3.1s
M140i LCI Mineral Grey Dorch Stage 2 HPFP, CG Precision DS-1, XHP, MHD Stage 2 HPFP E30 @ E42 100 - 200 6.96s Quarter mile 10.93@127mph |
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05-11-2020, 11:43 PM | #27 |
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https://datazap.me/sites/default/fil...oct_102ron.csv
I have CSF. ATI 22-28C at an outdoor temperature of 10-14C
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OzBMR574.50 |
05-12-2020, 01:05 AM | #28 | |
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In my higher boost run IAT increased from 38C to 44C at 5092RPM in 6th, 17.2 PSI (also about 20 PSI steady in 5th prior to changing to 6th), a change of 6C Is this a valid method of determining cooling performance of the CSF cooler, the change in IAT from cruising to 3rd/4th/5th/6th gear WOT run peak? This example indicates 16% - 17% improvement in IAT compared to the stock system. IAT's still increase, just less than they would with stock system. The CSF example indicates IAT's don't increase at all, 34C at the beginning of the run and 34C at 5900 RPM. This would be very boost/turbo efficiency dependent. Stock boost, as in alyabiev example on page 1 the IAT remained the same, or actually decreased from 29C to 27C during a 4th gear run. Pushing 20PSI at 6000RPM in 5th and 6th gears charge air temps get a lot hotter and IAT's will increase.
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Tesla Model 3 Performance 0 - 60mph 3.1s
M140i LCI Mineral Grey Dorch Stage 2 HPFP, CG Precision DS-1, XHP, MHD Stage 2 HPFP E30 @ E42 100 - 200 6.96s Quarter mile 10.93@127mph Last edited by OzBMR; 05-12-2020 at 02:53 AM.. |
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kern4174522.00 |
05-12-2020, 07:04 AM | #29 | |
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I was fine until I got my custom tune. 19psi creates exponentially more heat than 16-17. So the only way you can really tell is by doing logs to see if it's worth it in your situation. I don't think it will stay steady in my tune, but it should definitely help reduce the increase in temps over a multiple-gear pull. |
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05-12-2020, 08:56 AM | #30 |
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Kern are you going to make an install video as well or are we asking for too much?
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kern4174522.00 |
05-12-2020, 01:04 PM | #31 |
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Yes I'll be doing an install vid. the BMW repair instructions actually recommend doing it from the back, so my video will be different from the others. i'll be by myself so I don't want to remove the whole bumper/crash bar and worry about disconnecting all the sensors, cameras, lights, etc. I think it'll be faster than removing the whole front end too.
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05-12-2020, 02:07 PM | #32 |
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Also do you guys want to see anything specific with the heat exchanger before I install it? Dimensions, side by side comparison, etc. I don't think I'll be able to see the inside of the core since the inlet and outlet are so small and I don't have a scope.
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05-12-2020, 03:09 PM | #33 | |
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05-12-2020, 08:30 PM | #34 |
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I would definitely like to see some side by side comparisons from the factory unit. Very interesting log btw,following along and thanks for this.
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05-13-2020, 08:12 AM | #35 |
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Yes, fill them with water and put them on a scale. As I'm a circuit rat, I am reluctant to add weight to the nose unless it really changes the game.
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05-13-2020, 12:43 PM | #36 | |
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Maybe just measure the difference in radiator weight, then extrapolate total increase based on the additional fluid volume? |
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05-13-2020, 12:46 PM | #37 | ||
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05-18-2020, 06:55 AM | #38 |
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Installed this weekend. I'm thinking about just uploading the DIY now and then capturing the data and adding a review later. Some people have been asking me for more info on how I did it without removing the bumper. But the process is pretty simple.
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05-18-2020, 12:44 PM | #39 |
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Looks great, congrats!
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kern4174522.00 |
05-18-2020, 06:06 PM | #41 |
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Curious from looking at your OEM radiator. Do you have the rock guard installed? It looks like the bottom (especially) and a bit up top where the radiator is exposed got pelted by debris. I'm worried about a punctured radiator.
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05-19-2020, 05:53 AM | #42 | |
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The CSF was installed with the rock guard. But since it's black, I'm still kind of worried that it will be peppered from stuff hitting it over time. That would look pretty bad but we'll see. |
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05-19-2020, 07:30 AM | #43 | |
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With CSF Exchanger = 6.2L/1.6Gal Stock Heat Exchanger = 6.6lbs CSF Heat Exchanger = 10.6lbs I also diluted the coolant, so now it's closer to ~35/65 coolant to water ratio. With fluid you'd be around a total of 9-10lbs increase in weight. |
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