S33TNS
Guest
I am having problems with my n75 valve on my 04 Leon Cupra. Instead of just replacing it, I am after a uprated one. Can anyone recommend any good ones and any good websites to get them off?
mcdatkyid
Guest
What will control the boost then? Plus you'll only be running actuator pressure about 6 psi
You are getting mistaken for the N249
Stick with OEM, you cant really uprade a valve, its controled by the ECU, this is where you could 'uprate' it, but utilising it slighty differently, but as said before get an OEM one on mate
Follow the air box then the maf then the N75 you'll need new clips as the ones on there, if from new, can't be re-used.
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The N75 is a solenoid-driven pneumatic valve and is spectacularly unlikely to get dirty internally or externally.
It is connected by narrow pipes to the air cleaner (for a supply of clean air at atmospheric pressure) and the outlet of the turbocharger impeller section (for a supply of air at high pressure). The N75 valve switches between these two supplies to generate an output pressure somewhere between the two which is fed to the wastegate actuator to control the boost pressure.
There is no electronics inside the valve, only a solenoid, a small electromagnet. I'm not sure, but I think the only difference between the three or four various N75's is spring strength.
The ECU is calibrated to work with the stock N75, so trying to fool it by putting in a different one is likely to lead to unpredictable results. A good quality remap is a much better way to go, as all the engines operating parameters can be changed to provide a properly controlled tune-up without hiccups or surprises.
It is connected by narrow pipes to the air cleaner (for a supply of clean air at atmospheric pressure) and the outlet of the turbocharger impeller section (for a supply of air at high pressure). The N75 valve switches between these two supplies to generate an output pressure somewhere between the two which is fed to the wastegate actuator to control the boost pressure.
There is no electronics inside the valve, only a solenoid, a small electromagnet. I'm not sure, but I think the only difference between the three or four various N75's is spring strength.
The ECU is calibrated to work with the stock N75, so trying to fool it by putting in a different one is likely to lead to unpredictable results. A good quality remap is a much better way to go, as all the engines operating parameters can be changed to provide a properly controlled tune-up without hiccups or surprises.
Agree with Mutley and all the other advice regarding sticking to the standard valve.
The ECU requests the required boost and the N75 controls the VNT to deliver the boost required, it cant be manipulated bypassed or changed for another, thats just going to do the same job the ECU has requested!
Glynnd: only the TDI's have VNT turbochargers, the petrol engines (and the older TDI 90's) have wastegate turbos.
I'm not quite sure why this is. The petrol engines power curves usually show fairly flat torque values from quite low rpm, so I suspect that the torque is restricted by the limits of the engine internals, and sophisticated methods to improve boost at low rpm aren't needed.
I'm not quite sure why this is. The petrol engines power curves usually show fairly flat torque values from quite low rpm, so I suspect that the torque is restricted by the limits of the engine internals, and sophisticated methods to improve boost at low rpm aren't needed.
Replace with oem one mate £45.25p get some petrol pipe clips 13-14mm because u will need to cut the manufacturer clips of if not been already changed. Where the blue circles are that is the n75 valve
Pics below
Pics below
yes mutley your right! I have been reading another post, my car has a wastegate controlled turbo! leon fr 20v t.
No mate tells your DV when to open
The Waste Gate Frequency Valve (WGFV)(n75) also known as the Waste Gate Solenoid, is located near the turbo intake boot. The ECU controls this valve to regulate the amount of boost pressure that is sent to the lower chamber in the Waste Gate.
The valve is operated by a duty cycle that can vary from approximately 0-90%, the ECU varies the duty cycle, to adjust the boost level as programmed inside the ECU via boost maps.
selby
Guest
thanks for the pics folks thought that was it its been done b4 as the clips are different and its already been remapped so will a standard one go straight on mine runnin 240bhp just with usual mods air filter exaust any knowledge is good much appreciate it am also from newark small world
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I run the ecs race valve , it peaks another 1-2 psi and returns back to stock boost levels further up the rev range, runs fine with my map. Yet I've known a couple that don't like them,
As mentioned the safest bet is to replace with the oem type, e/f iirc , a drop of 3 in one cured my previous n75 floating boost issue, it clearly was sticking at times
As mentioned the safest bet is to replace with the oem type, e/f iirc , a drop of 3 in one cured my previous n75 floating boost issue, it clearly was sticking at times
selby
Guest
anyone now the part number for the oem n75 for the app engine would the h be better or is one better than the other as mine is already mapped and not sure wats on it. anyway u can tell the difference which one should i get 
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