Recirc is there to dump boost pressure built up in the charge pipe system to prevent compressor stall (aiding performance) which puts a strain on the turbo's shaft and can cause it to snap in two especially on a small turbo like the K03/4
<tuffty/>
wow that is exactly what i said to my mate who has been banging on about the recirc valve removale will enhance the sound of the wastegte , but my argument was that it is there for a reason and removing it may make the wastegate sound louder but will harm the engine if it is not there , thanks for your responses guys that has confirmed my suspicions!
Are you talking from experience or something someone told you?
The last part of that sentance, to put it politely is errrr ******! A dump/recirc valve is more of a necessity on a larger turbo, simply because of the larger volumes of air being moved and the greater forces being applied.
Your Turbo isn't going to blow up the minute you remove a std dump valve, so don't be scared by internet rumour mongerers. However, it is there for a reason and that reason is to aid durability on the turbo and help reduce spool up times - so in escence yes it does serve a purpose and your best bet would be to remove it for an uprated one that actually works (as being std and old yours prob doesn;t).
Are you talking from experience or something someone told you?
The last part of that sentance, to put it politely is errrr ******! A dump/recirc valve is more of a necessity on a larger turbo, simply because of the larger volumes of air being moved and the greater forces being applied.
Your Turbo isn't going to blow up the minute you remove a std dump valve, so don't be scared by internet rumour mongerers. However, it is there for a reason and that reason is to aid durability on the turbo and help reduce spool up times - so in escence yes it does serve a purpose and your best bet would be to remove it for an uprated one that actually works (as being std and old yours prob doesn;t).
...I know this reading malarky is all new to you but come on, read it correctly.
My comments weren't on the basis that the dump valve does nothing, it was on the basis that you said "DON'T DO IT COS IT WILL BLOW UP"
.
right... getting bored with your pedantic non arguments... I clearly haven't a clue what I am on about and I think the OP has enough info here to make a decision...
<tuffty/>
My comments weren't on the basis that the dump valve does nothing, it was on the basis that you said "DON'T DO IT COS IT WILL BLOW UP"
The DV does do something... as explained.
Not difficult to comprehend
I dont recall anyone saying it would break immediately either, "cos it will blow up" blah blah
... and comparing T4 garret with a K04 turbo is pretty meaningless.
stick em side bby side and its quite obvious how the shafts and seals, thrust washers compare.. IE they DONT
You might know something about your previous Jap cars, but you are showing quite some knowledge gap on VAG 1.8t so far
I think you'll find I replied giving concise reason for each differenece of opinion with you -
Again read what i have writen, i've never said thatIt simply WRONG tho.
the op would do well to ignore your advise to remove the DV
The blowing up was "IMPLIED"
The T4 comparison was on the basis of a large MARAM shafted turbo against a small turbo, as the poster had said it was MORE necessary on a smaller turbo such as the K04 - that statement is wrong - it is needed more on a large turbo. However, if what you say is correct about the K04 (and to be honest i somewhat suspect otherwise as turbo failure doesn't seem to be a big issue on high mileage s3's, even those running remaps and higher boost - but i won't argue that point as i don't know from experience) needing to run a dump valve, then surely the advice that I gave - QUOTE "However, it is there for a reason and that reason is to aid durability on the turbo and help reduce spool up times - so in escence yes it does serve a purpose and your best bet would be to remove it for an uprated one that actually works (as being std and old yours prob doesn;t)" is correct, YES?.
Don't just argue on behalf of your mate, read what I have said
My experience isn't only of Jap, i've had a variety from a Turbo'd Mk11 astra (using a KKK turbo) an Escort RST (Using GArretts), a Fiesta RST, a Delta Intergrali Evo, Escort Cossie, R33 GTR (Trust) as well as the S3, which has just had a Hyrbrid K04 (damn wish i'd have known how **** they were lol)
so you are full of contradictions fellareason is to aid durability on the turbo
Again read what i have writen, i've never said that
If you read what I have posted it makes sense... the bearings and shaft will see more loads when the DV is not functional or removed.. a lot more side load applied against the thrust washer for example..
whichever way you look at it its STUPID to remove it.
You even say yourself so you are full of contradictions fella
To remove one remains very bad advise, which is what you told the Op to do is it not?
duh!
...as the poster had said it was MORE necessary on a smaller turbo such as the K04 - that statement is wrong - it is needed more on a large turbo....
Have your read anything I have written? My points were that Tufty was wrong in saying that they are needed more on a small turbo, its larger turbos that generally require them as they move larger volumes of air - fact. Ok you state the K04 is weak, i'll take your word on that, BUT the fact remains its the exception to the rule, you even mentioned yourself that its not as strong as the likes of GArrett (see I read what you write).
I said removing will not immediaitely blow up your turbo (do we agree on this point?) i said its better to replace it with a new or uprated one that actually works, as his old tired one probably doesn't.
so, DUH
The statement was in relation to the fragility of the K04 as opposed to small v large turbos in general... while I concede this may not have been clear, my statement stands... fragile turbos (small or otherwise) are more likely to suffer a failure brought on by an inadequate or non existant means of relieving charge pressure...
<tuffty/>
side by side comparison of T4 and K04 will show relative shaft sizes, compressor wheel sizes and turbines.. night and day different in many respects
I am not making, nor have made any case for smaller unit needing a DV any more than a larger one, one is smaller shaft with less inertia, one is significantly larger with more inetia, which without DV aiding the throttle shut, pressure spike/comp stall, is high wear on both units respectively.
DV's are fitted these days to aid reliability. Its fact that without, the units will not last as long for the reasons mentioned
Fitting a DV which can cope with the duty better is always a good thing. forge piston ones are popular, but functional factory ones, whilst working also do the job ok. (they're just prone to splitting their rubber diaphragm)
What K04 hybrid did you go for on your S3?
yea, just re-read it and you did'nt agreed.
mixed you up with marks eejit friend.. - lol
my bad
Which Eejit friend, i have loads. LMAO
:icon_thumright:
I have no idea what spec the hybrid is, my engine tuner sent it off for me and arranged for larger compressor
who was that?
turbo supplier that is..
did you find it made a difference?