You're right in that the radiators capacity is still exceeded, but coolant table changes can have you sitting at 180-190f for 90% of your lap and only rising that 10-15f increase during your pulls on the straight away... You'll probably be able to stay under 210f in the same situation you're currently hitting 240+. Huge difference there...
Quote:
Originally Posted by fe1rx
You must be kidding. What "track" are you talking about? I am talking about 20 minutes of consecutive 3rd and 4th gear pulls on a fast road course. No possible street driving comes close to this thermal load on the cooling system.
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The statement is something trivial that isn't worth arguing over, but I don't know of any tracks here in the NE that have 3-4 back-to-back straights where you can actually go flat out in 4th for consecutive 60mph to 125+ mph (OBD/GPS speed not dash) pulls multiple times in a row. I am not talking about street driving, I am talking about doing 3-4 4th gear pulls back-to-back on a several mile long flat road.... That only happens 1-2 times a lap on most tracks with the rest of the time being spent in 3rd gear at closer to an average speed of 60-70mph (top of 3rd). Things start to heat up exponentially more at 5000+ rpms in 4th gear (100mph+).
Quote:
Originally Posted by fe1rx
I don't know any way to log coolant pump speed, but perhaps you have data to support your assertion. I seriously doubt the coolant pump is not running flat out well before the coolant approaches 117 C (243 F), which is where the ECU starts pulling power.
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I am sure you follow MHD, so I am sure you've seen the cooling tables:
Quote:
Sport Mode:
Coolant normal 95c (106c Stock)
Coolant high 90c (95c Stock)
Coolant high+kft 80c (85c / 80c Stock) (This mode is activated at full throttle)
Amb threshold for high mode 27c (37c Stock)
Amb threshold for high + kft 32c (42c Stock)
Track Mode (only for drag race application):
Coolant normal 90c(106c Stock)
Coolant high 85c(95c Stock)
Coolant high + kft 80c(85c / 80c Stock) (This mode is activated at full throttle)
Amb threshold for high mode 22c(37c Stock)
Amb threshold for high + kft 27c(42c Stock)
There is an ECO target (109°C stock) but it is not modified
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Look at the stock values... If ambient isn't over 42c (108f), or you aren't at 100% pedal angle (flat out), you will never be driving the water pump at full tilt (High + KFT mode). I am not 100% sure on the KFT mode logic, but I am guessing you need to be either flat out or ambient >42c for it to work. Either way, you can see how you'd spend very little time in KFT mode seeing as how most road-course driving is done at part throttle rather than being flat out. That ambient threshold is just ridiculous.
Even high mode requires ambient to be at 37c (99f) before it targets 95c coolant (203f). Therefore, you're water pump will be spinning at speeds designed around "normal" mode in just about all instances on a road course and only targeting 106c coolant (223f).
With the "race" settings, high and high + HKF modes are activated at lower ambient thresholds and target EVEN LOWER coolant temps than stock.
Real world results of the changes:
E30 custom tune hitting 215+ load:
4th gear pull (65f) vs 4th gear pull (94f) - both logs are of how things look after 3-4 4th gear passes have already been made back-to-back:
http://datazap.me/u/banks334/v6-65f-...=1&data=4-6-16
Just for reference, here is how my car did at two tracks even before any cooling changes (Old 93aki 200 load custom Cobb tune. Cooling tables could've been modified by COBB but I am not 100% on that):
Palmer (65-75f ambient) :
http://datazap.me/u/banks334/palmer-...data=1-5-14-18
Lime Rock (88-90f+ and very humid):
http://datazap.me/u/banks334/track-d...on-4-lime-rock
I imagine the above logs will look way cooler this season with the new MHD settings.