10-30-2018, 09:20 AM | #46 |
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11-04-2018, 04:25 PM | #48 |
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Street driving : not so much difference to be honest. Real test will be track but worse case scenario it will not be before May next year for me.
So, to what I found so far. My usual trip from home to the exit of the highway almost made me reach the temperature of 100°C where I felt safe to go in Sport+. Now I feel I've reached it slower but it can be because of weather getting cooler. First time I drove it on the highway in Sport+, I was surprised because after reaching temperature of around 110°C, coolant temp then quickly dropped, even under 90°C (I've reached 89°C actually). Driving like usual the following days in the city, nothing much changed BUT spirited driving on the highway today, it dropped to 90°C. So my conclusion is yes, a bigger radiator is of course helping getting coller but in this case it helps getting cooler FASTER. BUT ! Now I think I may have an issue and maybe you guys can help me get around it. Since installation, I have an intermittent though rather periodically often motor noise (at first it sounded to me like a phone call from an other car, no kidding !) Opening engine bay I can hear distinctly this noise in the vicinity of the coolant tank. Could it be cooling pump OVERWORKING because of of the mucho extra coolant ? I believe my shop but the right amount, I even told them it was more than 17 liters but I will book with them an other just in case to have a look. Do you think it could damage the pump or reduce it's work life ? Is there a way to replace it with a stronger model ? Cheers. |
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11-05-2018, 12:35 PM | #49 |
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Why are you measuring engine coolant temps when you've upgraded the capacity of the water-to-air cooling circuit?
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11-05-2018, 05:43 PM | #50 |
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I read water temperature on the M Performance steering wheel with screen, you make me doubt but are you sure it is only engine water temperature I'm reading ?
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11-05-2018, 08:08 PM | #51 |
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Isn't it one radiator that does double duty, Engine and Water to Air Intercooler?
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11-06-2018, 02:04 AM | #52 | |
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Maybe I was reading engine temp all the while, silly me ! By the way, if you look at realoem, you can see that there is 3 different variations of cooling system, one without, one with 1 (my car I suppose) and one with 2 small auxiliary radiators. I still feel that oem water pump for charge air cooling circuit is now too small for the task and it's overworking with twice the amount of liquid to pump. |
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11-06-2018, 05:24 PM | #53 |
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Amount of coolant will not labour pump more.
Wow, what a ridiculously large cooler, the intercooler now has more coolant in it than the engine radiator? Pointless mod right there. |
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11-07-2018, 01:40 AM | #54 |
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Pretty harsh comment there.
It is the same as putting a bigger air-air intercooler but in the case of B58, charge air intercooler is integrated in the intake manifold so the only way to actually do something was to but a bigger water radiator. Will check my issue with the shop when I come back from business trip. |
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11-10-2018, 02:26 PM | #55 | ||
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As stated above the pump will not suffer with more volume. I'm inclined to agree and disagree. The radiator portion of the water-air system has been increased in terms of raw surface area and should lend itself to a degree of improved heat transfer capabilities. The additional volume however I suspect will make very little difference once the water-air circuit is up to temperature. The time it takes to reach that temp will likely increase marginally. |
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11-10-2018, 03:29 PM | #56 |
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I think the main thing to consider is that you'd definitely want your intake air temps to be less than that of your engine. Granted, you have a lot less load on the intake cooler. But there's a reason why you see racers put ice in their intercooler tanks. Cool intake charge is the most critical thing for engine performance and health, especially in turbo applications.\
However, I don't feel like I've seen anything that indicates this mod is needed for 99% of the forum members. |
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11-10-2018, 09:52 PM | #57 | |
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11-11-2018, 03:41 AM | #58 | |
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It seems many look at an intercooler the same way they do an engine cooling radiator circuit. It's not, you want it to work completely differently. In an intercooler you want a very fast responding, efficient cooling system. Bigger is not automatically better. That is why air-air systems are hard to beat, they have an in-line cooler that gets busy when a big boost event occurs, then quickly settles after. You want the system to have as little capacity in it as possible otherwise your intercooler spends a long time being an interheater. A bad thing. Comparing to air-air systems, the N55 has a frontal area probably only 20-25% of the standard water-air B58 unit. The air -air unit is also probably 4 times deeper to compensate. However in cooler design, the second half of the depth is only about 25-30 percent of additional cooling, a function of lower delta t, and capacity of already heated air to carry heat. When you consider all the above, you realise that the B58 is fitted with a massive upgrade on the N55, stock. But with conscious consideration to keep the whole mass of coolant down for fast cycling response. Looks to me to be an optimal design. I honestly can't see how adding 15kg of coolant and radiator to the very nose of the car is a good performance mod. : |
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11-11-2018, 12:11 PM | #59 | |
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11-19-2018, 02:53 AM | #60 |
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Wouldnt the larger amount of water allow for a more constant temp for a drag race?
Actually i was hoping that the DME, when hacked, would allow us to control the low pressure coolant pump duty cycle as well as the rad fan so that i have more cooling.... |
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11-19-2018, 11:32 PM | #61 | |
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11-21-2018, 06:21 AM | #62 |
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11-21-2018, 08:35 AM | #63 |
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Sorry for being obtuse - is this giant radiator JUST for the air/water intercooler? If so - my god, thats large. I would probably have just considered putting a large reservoir in to add capacity.
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11-28-2018, 12:24 PM | #64 |
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12-08-2018, 11:06 AM | #65 | |
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01-22-2019, 03:43 PM | #66 |
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GUYS, PROBLEM IS FINALLY SOLVED !
Long story short, my garage found that the culprit was a faulty ground in the electrical system. Took him 2 days to figure it out. This ground problem lead to the pump noise problem, plus it happened to also trigger the front fan abnormally AND I had a loss in power past 4500RPM too. Truth be told, I did a dyno run before Christmas and I was too ashamed to report it here... Ground problem also screwed up engine map apparently. Now it's sorted, I need to find time to test the car more deeply before transmission flash and engine tuning, I have a new tuner in my area who has a franchise of BR-Performance, a well known tuner in Europe. Stay tuned but I'm so relieved for now ! |
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