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On my 1.9TDI engine (with pd) on a polo 9n, the ecu reduces the power, if intake air temp. will go over 60 degrees.
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My 1.9 TDI BXE 105 cv intake warmed to 40ºC with full power with upper grill block of my Seat León II. This car runs cold, I checked my thermostat warming water and with a thermometer, it opens at 87ºC as it is rated, but vag-com obdii reading give me 80ºC, and only goes to 90ºC when city driving after road driving. Other funny thing is that fuel temp. gets stabilizadez aroun 70ºC and when using full power, or returning city it gets even hotter than coolant. It has FMIC as stnadard.
But 1.9 TD
I AHF 110 cv air intake warmed over 60ºC and maintained maximum power constant so, cold air intake is necessary if driving Autobahn at full throttle
on that Skoda Octavia. Highest Fuel temps I measured are about 40ºC or less, and Coolant in 10 min gets 90ºC, less than 100ºC even full load, full power or city driving. It has SMIC, with custom selfmade ventilation to wheel.
Some interesting Boat Tail alternative or improvement could be that System Drag Reduction (invented 10 km from my home, world patented)
- System Drag Reduction | www.sdr-sys.com/ing -