All Things Mk5 > Performance Modifications

Seems I need some new mods to get a map

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flashp:
Stage 1 was cheap for me as I had no other hardware. I quickly realised that when I went to stage 2 the hardware requirements made it an expensive leap to do it properly and hard to do in stages to break the cost down because there are so many things that rely on each other to avoid issues. Been rock solid for a long time now.

rich83:
You dont need an RS4 valve at stage 2 level.

AJP:

--- Quote from: rich83 on August 05, 2016, 11:18:58 pm ---You dont need an RS4 valve at stage 2 level.

--- End quote ---
I always thought that too. But, if a guy that builds engines like Steve does tells me it'd be worthwhile, I'll listen.

Suppose a lot depends on the map though. It's not beyond the realms of possibility that one Stage 2 car requests more fuel than another Stage 2 car, especially if both are custom mapped.

Let's say Car A just about qualifies for 'Stage 2' with a less than favourable hardware setup, and as such gets mapped accordingly. Car B has an optimal hardware setup and also gets a 'Stage 2' map. Yet, car B's map requests more fuel than car A's, due to better flow, lower EGTs, and so on. Not all Stage 2 cars are equal. Case in point of why labelling custom maps with 'Stage' this and 'Stage' that is misleading.

I know traditionally the RS4 valve was only deemed a necessity on a 2+ k04 setup. But if you think about the mechanics of fuel delivery on the TFSI, and how R-Tech in particular are squeezing more and more torque out of these engines - at low-mid revs where it needs all the fuel it can get - there's every reason why even a k03 car on a demanding fuel map might benefit from an RS4 return valve. As well as a proper pump, which goes without saying.

rich83:
Unless the ecu is requesting more than 130bar the the rs4 valve isn't needed.

I'm stage 2 and mines doesn't request more than 130bar. OEM pump. And therefore the rs4 valve wouldnt make any difference

AJP:
In your case, on your map, then no it wouldn't.

But this is exactly my point. It's a flawed argument to state that because one particular Stage 2 car doesn't need an uprated pump or would benefit from an RS4 return valve, then no other Stage 2 car would either.

Again, this 'Stage' categorisation sometimes muddies the water.

I should have got a printout of the logging from a couple of weeks ago.

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