Can't find any Audi specific n75h valves anywhere, all I see are ones for sale at like VW tuning sites. So i am wondering if I can use any n75h valve? Or If I need to just get a normal n75 valve...All reading has opposite answers, I've seen what most people have and am leaning towards getting a stock n75 valve. Only one I can find is the stock one at ecs for like 80$.

 

the n75 arent vw or audi specific. You can use them on either car

 

the h valve is more commonly known as the race valve, none of your dealers will have it, or at least none here in stl did

but you might talk to onepoint8, cause i think the h/race valve and giaccan cause limp mode, but don't qoute me on that

 

i know people use the race in b6's and it too causes an overboost/limp mode, people use a MBC to control it and hold boost slightly longer... im due for one too i think ill just stay with oem, i forget which letter it is.. F?

 

if you get an mbc, i dont think you need to have the n75 still (except to keep it connected), i could be totally wrong though.

 

you are correct.

 

thats going in the sig

 

there was a big discussion on the zine about it..... i think it spooled either too quick or not quick enough.. since the MBC just limits peak boost,,, all the b6's run the race valve in parallel with their MBC, im sure u can do it either way, it will just take some playing around

now that i think back, they parallel'ed them because the n75 regulated the boost up to peak but since they had the race valve, it would spike to high... the MBC then kept it from going into limp mode from the excessive spike.. so the end result, you were able to squeeze a few more pounds of boost out of the k03 and hold it slightly longer throughout the powerband

 

ball and spring mbc alone on a ko3(s)/4 spools way to fast for most. You either need to run that inline with a n75 or get a bleed valve or combination b&s w/ bleed mbc. I have the latter and run it by itself, no n75 and it is smooth as can be and no spiking (due to the bleed valve) and spools fast and holds boost longer (b&s)