Replaced torn dv with new and not blown away with performance increase

[ReflexRob]

Swapped out the original torn rev c dv with a rev g today. The Boost increase is better but not night and day.

Is there anything else I should check?

I've changed the pcv unit but not the rear metal pipe yet. Also my thermostat is sticking.

[ReflexRob]

Ok, might have been a bit premature in my assessment. Not sure if it took more than 1 journey for the car to reset any errors it had but it seemed a fair bit quicker this morning. I know it was damp but I was spinning the wheels in THIRD! Made me chuckle....

[AJP]

Ok, might have been a bit premature in my assessment. Not sure if it took more than 1 journey for the car to reset any errors it had but it seemed a fair bit quicker this morning. I know it was damp but I was spinning the wheels in THIRD! Made me chuckle....

3rd?! What tyres are you on? k03 or k04? Remapped?

Anyway, I had a new Rev G fitted a couple of months ago, and it did seem to 'adapt' after a few days of driving.

Fwiw.. mine is a k03, Stage 1 R-Tech, with Michelin Supersports, and it sometimes spins up in 2nd. That's in a straight line, on a good surface. I'm sure it'd spin up in 3rd if I gave it the beans round a bend, but I try not to

Sounds like you're getting healthy boost now.

Edit: Just saw you said DAMP. That explains it!

[ReflexRob]

Yeah I'm not at all saying the car is any more powerful than standard, i'm just happy that it seems to pull harder now. Having only ever driven the 1 GTI and coming from a BMW 325 with identical 0-60 it felt relatively comparable although never that I had gone from an N/A to Turbo car.

Tyres are amazing - Kenda Kaiser!!! Sadly they are brand new put on before I bought it. I am trying to kill them asap although to be fair in the dry they are pretty grippy, they just make a hell of a noise and are a bit loose in the wet. Not the worst in the world but I want Eagle F1's again which I loved on the 325.

Turbo is a standard K03. Before I fitted the dv replacement I didn't used to get wheel spin, even in the damp.

[Nickd57]

Why do people not put the piston type dv in? I need to replace mine but not sure what to replace it with? I have a 2006(56) gti k03?

[ReflexRob]

Because they don't often seal well. The D doesn't fail but you will lose boost which is as bad as failing. On the flip side the rev G might tear in the future, especially if mapped in which case a D is the better option.

There appears to be no solution that works with each setup.

[Nickd57]

Ok, so my car is mapped, my current dv has failed, how often does the rev d lose boost? So if i dont mind replacing it every 3-6months i should get rev g?

[AJP]

Loads of threads on this guys.

Consensus of respected tuners and forum members is Rev G, treated as a consumable, and replaced at service time or at least every couple of years.

It's not a big job or an expensive part.

You shouldn't really look at it as 'fit and forget', especially on a remapped car.

[ReflexRob]

That's as far as my knowledge goes. From what I've heard the rev D leaf is intermittent but the mappers all recommend it as the rev G can tear straight after a remap. You won't need to replace the rev D as it won't break.

[AJP]

Pretty sure the guys at R-Tech recommend the G. There's a big thread somewhere with quite a bit of input from tuners and the likes of Hurdy, and as much as it is a bit 'swings and roundabouts' between the rev G and the rev D, it seems the G was preferred overall.

At least if you've got a rev G it'll be obvious it's split. And you know you'll be getting full boost with a new one.

With a rev D, I'd personally always have that nagging doubt that I was losing a few PSI, as much as it was 'working'.

[ReflexRob]

Ah ok, must have just remembered someone saying the D was preferred for mapping. I agree that at least the G will let you know there are issues. I guess a boost gauge and a D would also work.

Seems nuts to me that people are accepting that a 12 month service should also include £35 of cam follower and £45 of dv every year?! That makes the Golf GTI hot hatch very expensive to maintain in my opinion considering it is only 200bhp and not an absolute premium brand....

[AJP]

Yeah, fair points.

Although I don't think the follower would need replacing that often. Maybe if you have an uprated pump.

Someone probably did say the D is preferred for mapping. And they're as right or wrong as someone saying the G is preferred!

I chose the G after reading up as much as I could and trying to make an informed decision, and so far in my case it's been fine.

I'm sure there are plenty running the rev D without issue too.

They're two different designs built to achieve the same function. So I guess opinion will always be somewhat split.

[Nickd57]

Hmmmm, suppose the rev g would be the easiest option, as yous say, you know when its faulty and obvious when it is, where as the rev d could be 'intermittant' in its function am i correct? Sorry for all questions etc kinda new to the modifying vag scene.

[GTIEagles]

I have a D on mine and I have considered replacing it with a G due to hearing all these stories about loosing boost but mine is standard at the moment and I figured it's less likely to loose boost compared to when it's been mapped. So I will be staying put for the moment but when I do eventually get a map I will whip a G on it 

[MPS]

Never understood why someone doesn't just sell the replacement diaphragm on its own as changing the solenoid is a massive waste, especially when there's nothing wrong with it.