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Discussion Starter · #1 ·
I noticed that this part was offered on ECS Tuning's website, and the basic description is that it works just like stock, but its response is delayed by perhaps a half a second or so. It claims to smooth out jerky power curves and improve low-end boost. Anybody have experience with this item? Rave reviews? Horror stories? Related to an AEB engine, if possible?
 

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I've been running one on my car(ATW) for around 2 years now. no real problems except for limp mode when its cold outside and i let it go past 20psi. boost comes on harder than it used to with just a chip. the boost spike found in GIAC where it spikes at ~17 then drops to 15psi is gone. it just goes to 18-19psi and stays there until you get higher in the rpms and then it will drop off like normal. i tried it on my girl's AEB engine and it did nothing. no change in anything. and here's the link to my dyno so you can see that my a/f ratio is fine all the way up to redline.

http://www.passatworld.com/forums/showthread.php?t=206620

Oh, and its really an "H" valve found on the older S4's. ECS just tweaked the screw a little bit and filed off the part number.
 

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I have used one for about a year now, a try to even out some spiking issues, and it worked.
 

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Discussion Starter · #7 ·
I've been running one on my car(ATW) for around 2 years now. no real problems except for limp mode when its cold outside and i let it go past 20psi. boost comes on harder than it used to with just a chip. the boost spike found in GIAC where it spikes at ~17 then drops to 15psi is gone. it just goes to 18-19psi and stays there until you get higher in the rpms and then it will drop off like normal. i tried it on my girl's AEB engine and it did nothing. no change in anything. and here's the link to my dyno so you can see that my a/f ratio is fine all the way up to redline.

http://www.passatworld.com/forums/showthread.php?t=206620

Oh, and its really an "H" valve found on the older S4's. ECS just tweaked the screw a little bit and filed off the part number.
So it's just a slightly-retuned H valve. Hmm. Do you understand what turning the screw managed to accomplish well enough to explain it to me?
 

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So it's just a slightly-retuned H valve. Hmm. Do you understand what turning the screw managed to accomplish well enough to explain it to me?
It's an H valve without further modification. The part number is removed but that's history now since many people know it is an H valve.
 

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i remember people on either AW or AZ commenting about the H valve has been tweaked by turning that screw a while back. I don't know if that screw is there for adjustment purposes or for assembly though.
 

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Discussion Starter · #10 ·
i remember people on either AW or AZ commenting about the H valve has been tweaked by turning that screw a while back. I don't know if that screw is there for adjustment purposes or for assembly though.
I think the screw adjusts the N75's operation when it's unpowered (that is, when the ECU isn't directly controlling it).
 

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I have an AEB, yes I have read the warnings and so on, but I am not pushing this car much, commuting in it, and since I got it, under normal acceleration up to highway speeds, it would begin jerking, and boost fluctuating.
 

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i remember people on either AW or AZ commenting about the H valve has been tweaked by turning that screw a while back. I don't know if that screw is there for adjustment purposes or for assembly though.
The screw is there for adjustment, but the difficulty in making meaningful adjustments makes it not worthwhile. The different valves C & F, H, J & K give you enough choices if you want to try something different.

Final answer, the ECS valve is an H valve with the part number milled off. No further modification.
 

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Discussion Starter · #13 ·
I have an AEB, yes I have read the warnings and so on, but I am not pushing this car much, commuting in it, and since I got it, under normal acceleration up to highway speeds, it would begin jerking, and boost fluctuating.
This happened before or after you put the N75H valve in?
 

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I noticed that this part was offered on ECS Tuning's website, and the basic description is that it works just like stock, but its response is delayed by perhaps a half a second or so. It claims to smooth out jerky power curves and improve low-end boost. Anybody have experience with this item? Rave reviews? Horror stories? Related to an AEB engine, if possible?
About two years ago I went to ECS looking for that upgrade, and was told by Tom not to use the N75 vale on my Passat.
 
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