Hi all,

I've just fitted a boost gauge to my Vrs - now I know they're supposed to be approx 8psi standard boost, and I would guess thats at WOT

However, I'm only seeing 4-5psi at WOT. I've got no engine warning light, the car still feels like its running as it always has done. Unfortunately not got VAG-COM so I can't scan for errors.

I've checked all the hoses in the engine bay, and all seem to be on securely.

I was going to try with a different boost gauge to see if its the gauge thats at fault, but other than this can anyone recommend any checks, or have any ideas what might be causing a problem? If my turbo wasn't boosting correctly, would the engine warning light come on?

Thanks

Andy

check the FRP line for leaks and see if its leaking there.

if that fails undo the MAF and go for a quick spin to see if that makes any difference

Forgot to add, the gauge shows that the boost holds well at WOT, just at 4-5psi not 8. Doesn't seem to spike or get to 5 then drop off at all?

Have a look at your dump valve mate.

Brother had the exact same problem and turned out to be his DV

I was starting to think it might be the DV, will have to contact Forge and see if they can service it and find a temporary replacement!

give them a call first thing like my brother did.

they couldnt be bothered to take his card details so sent him one out FOC

Right, bit of an update;

Didn't get round to servicing the valve yet, mainly as the valve I've got is one of the old 006 with allen bolts holding the halves together which have seized.

Anyway, I began noticing that the car would accelerate quite nicely but then seemed like it was losing boost pressure and would 'stall' momentarily, normally around 3-4psi, before holding this pressure.

I thought that this could be down to the DV still, but then after checking hoses found that the vacuum hose that goes onto the top nipple of the DV doesn't seem to be on tight. I remember now that I changed the vacuum hose after fitting my Forge TIP as the standard one wouldn't reach any more - the new hose had an internal diameter of 8mm to fit on the solid metal hose down by the engine, whereas the original pipe had an internal diameter that reduced to 5/6mm at the DV end.

On a long drive today, the CEL came on and I seemed to lose a load more power - could this all be down to a combination of the DV needing a service and the vacuum hose having an internal diameter too large that is causing a leak?

Doubt it tbh.

The DV yea but as long as the hose is secured on properly each end i cant see it making that much difference really