? on n75 valve
10-09-2002, 10:44 AM
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? on n75 valve
after doing a search on the valve, i have an understanding on what it does. my question is, why replace it? the ecs n75 boasts around 7 hp gain and the thing is only like 80 bucks. sounds worth it to me, but what exactly is the ecs n75 doing that my stock one (probably in fine shape) isn't? anyone that has one want to chime in and say how they like it and how it is different? thanks in advance.
10-09-2002, 10:50 AM
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Based on everything I've heard, think of it as being similar to...
...having MTM do the dual-engine mod to your TT. :-P
Actually, it suposedly holds the boost much higher in the rev range than the OEM valve. Perfect for blowing your turbo up.
Actually, it suposedly holds the boost much higher in the rev range than the OEM valve. Perfect for blowing your turbo up.
10-09-2002, 10:53 AM
#3
the N75 valve is a frequency valve that regulates the
wastegate action, the Race N75 valve is reportedly from a earlier turbo Audi (possibly the Coupe quattro)
It opens the wastegate a bit sooner and longer from all that I have gathered thus producing more boost
It opens the wastegate a bit sooner and longer from all that I have gathered thus producing more boost
10-09-2002, 11:06 AM
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I can't see how the N75 valve can "make more boost"... the valve is in a closed control loop...
the duty cycle signal generated by the ECU controls the period in which this valve "vents" the intake charge. The duty cycle is generated by an algorithm than uses the command and actual pressure for data input. I have designed several controllers using this method in the past - the valve's only contribution to the equation is A) does it vent enough. and B) can it be driven at the desired duty cycle. If the valve is defective, i.e. a leaky seal or intermittent actuation, the results can be "out to lunch", but replacing once valve for another (assuming both are operational) should result is no difference between the two in actual operation. The duty cycle may be different, but again that is all compensated for by the closed loop control mechanism provided by in the ECU.
