Re: FV-QR (ndifadvokit)
Quote, originally posted by ndifadvokit » |
Every time i think i'm getting through to you, you turn around and surprise me so a little repetition to clarify the facts seems appropriate. |
Wait...What ??
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See, this is what you are not getting. My stock valve (supposedly rated to 130bar as you mentioned) was NOT, i repeat NOT, making it to 130bar even though 130bar was being requested. Rail pressure was instead getting dumped at 127bar. This is where your best guesses on what is *supposed* to happen are trumped by my real world experience. Call it a defective valve or an acceptable tolerance level or whatever you want. Fact is it wasn't making it to the requested 130bar value. If your stock valve consistently is, i'm thrilled for you. Mine however was not. But with the RS4 valve it is now consistently, 100% of the time meeting or exeeding the requested 130bar value at the top end. |
Aahhh ok...Now i get it...You simply do not understand how the system works, and what this valve you changed ACTUALLY DOES...It is understandable then why you keep trying to convince me of something that is WRONG, simply because you understand it wrongly, and that
doesn't make it right..That's where the problem lies...
Here it goes then, this is what you are confusing, and the reason why i already said above that people that have no knowledge of how the system works should not be installing parts in their car simply because they were TOLD TO, or encouraged to do so...
The valve that is present in the fuel rail in both the GTI and the RS4 is called a PRESSURE LIMITING VALVE (as i have already mentioned above) for a reason.It is NOT making or raising the pressure by ITSELF.And this is what you keep confusing, and the reason you have everything mixed up in your head.
According to the pressure the valve is RATED AT, it ALLOWS fuel to BLEED OFF the system/rail to avoid excessive pressure.BUT once again, it is not the one MAKING THAT PRESSURE.
To make it even more understandable to you (and others you have possibly confused) i'll give you an analogy.
Say you have a faucet and a hose that is attached to it, and that hose is capped at the other end (in our case non spraying injectors).If you turn on the faucet and leave it on (this represents the HPFP) pressure starts to build up in the hose.Now in this hose you have a pressure sensor (the sensor on the rail) that monitors the pressure in that hose.You want to keep the pressure stable in that hose (for many reasons, i won't get into this now) so you have a)the sensor for checking and b)A PRESSURE LIMITING VALVE (yes this is what we are talking about) acting as a "hole" in the hose, a hole that opens at 130 bar "HOSE PRESSURE".So when that sensor sees 130+ bar..pssssss fuel leaks out and pressure returns to sub 130 bar levels.Is that clear so far ?Do you get the DIFFERENCE with what you as saying and is in your mind ?
Now...what IF...you had a "bad" faucet (or a bad HPFP/cam/follower) which COULD NOT EVER MAKE 130 bar (in your case as you say 127).WHAT GOOD WOULD A 136 bar (RS4) or even 130 bar (GTI) make ??ZERO...NADA...And that is because due to the fault in the system PRESSURE WOULD NEVER HAVE TO BE RELEASED!!Does that make sense now ?Do you get it ?
Of course all of the above is a rather simplified analogy, simply because of the fact this is a dynamic system, with constant variations in fuel demand and delivery, but it serves well for you to get the big picture.I hope now you'll see where you were wrong and think the whole thing over....
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I have literally personally taken apart almost every (reasonable) part of my car over the time i have owned it. I'm starting to think you have a superiority complex going here on or are just accustomed to dealing with really incompetent people. The answer is yes. I'm very aware of what requesting more rail pressure means to other components. |
I'm not even gonna address the personal comments, i think i've answered those by taking the time to explain to you what you have understood wrong, and that is enough....
I am hoping others will benefit from it too.