Had performance logs done by Revo (Surrey) this morning to check whether there was a problem with my MAF. This was working fine as was engine request for boost etc. However, about three weeks ago performance mode (high octane setting 3 on Select switch) started feeeling like stock mode, and still is.

Simon at Wheelbase is sending logs to experts at Revo for their analysis. We were/are both of the opinion that there is an air leak somewhere. Next step is to try Forge (recirc.) DV, as there have been at least two mods to std DV since purchase of car (March '06, currently 7700 miles). Are there any Michaels Caines out there with 'another idea' (ref Italian Job)? Cheers:confused:

Souns like you may have a DV with a split diaphragm. That being the case a Forge device won't help you as it's in addition to and not instead of.

The valve comes in the latest variant with a 'C' as the last digit of the part number.

Do you have the logs?? I'm assuming you mean rqstd vs actual.

I do have more info if you like it.

This has been an issue with the Golf GTi MkV and like Stu says it's probably the DV valve splitting (some guys have replaced the DV several times!!!). The REVO map will also reset the timing to '0' if you disconnect power from the battery but as you have a Select Plus device this would return it back to your settings. Just out of interest what Boost and Timing are you currently running and what RR figures did you get?.

There are a couple of aftermarket solutions for this (see this thread) but most are waiting for Forge to come up with their solution but I understand that it's at least 6 weeks away (see this thread to keep abreast of the latest).

Very interested in what information you get back from REVO with regard to your data logs and please post what you can on here.

Hope you get this problem solved soon

What does the 'MP' stand for in your car description? :confused:

Thanks Guys. Seems you've more than confirmed my suspicions, and wonder whether getting a DV with revision 'c' will resolve the issue. Not quite sure how I will get dealer to change this under warranty as there are no fault codes 'til it fails completely. Any suggestions?

Haven't got the logs, unfortunately, they're on Simon's pc, although I could probably obtain a copy, if not 'top secret'

Running Boost 6 and Timing 5 on Stage 1 and 98/99 RON ie when boost is not lost.

Cheers again:thumbup:

The DV is only around £26 so you'd be as well to change it yourself.

As far as I've seen with regard to revo logs, requested is always slightly more than actual but obviously the differance might be greater if your DV were split.

Looking at the date of your car, if that's near the build date, I would say you already have the C revision. They do still split though.

This has been an issue with the Golf GTi MkV and like Stu says it's probably the DV valve splitting (some guys have replaced the DV several times!!!). The REVO map will also reset the timing to '0' if you disconnect power from the battery but as you have a Select Plus device this would return it back to your settings. Just out of interest what Boost and Timing are you currently running and what RR figures did you get?.

There are a couple of aftermarket solutions for this (see this thread) but most are waiting for Forge to come up with their solution but I understand that it's at least 6 weeks away (see this thread to keep abreast of the latest).

Very interested in what information you get back from REVO with regard to your data logs and please post what you can on here.

Hope you get this problem solved soon

Steve

whats the score on this battery mullarkey then? because there are plenty of people that will recently have fitted MFD2's for example and had the battery disconnected whilst doing it.

Steve

whats the score on this battery mullarkey then? because there are plenty of people that will recently have fitted MFD2's for example and had the battery disconnected whilst doing it.

Not sure if it affects ALL derivatives of the 2.0T FSI, but if you remove battery power the ECU reset's the timing to 'Zero'. I noticed it after installing my MFD2, not straight away mind you as it's only when you give it the beans do you notice that something ain't quite right. It's a known problem with REVO and one that apparantly cannot be sorted with their software.

The only way to check is to take it to your car to a REVO dealer or buy a Select Plus device, a poor solution but I'm affraid it's the only way to check for certain what your settings are!.

Removing power for a period of time sets timing back to 0.

You then need a dealer or Select to set it back.

Edit - Beat me to it Mr Fish

Hmmm, maybe this is the mysterious loss of power at the top end being experienced instead of a boost leak, as the DV is fine (I had it orf today whilst messing with me flaps)

Hmmm, maybe this is the mysterious loss of power at the top end being experienced instead of a boost leak, as the DV is fine (I had it orf today whilst messing with me flaps)

You can get it checked out at the RR day on Saturday

Sounds like it's easier to buy and fit new (rev 'c') dv and reset timing etc with my Select. If this works all well and good. If not it's back to head scratching! May get friend of Simon (Revo techy) to fit it at the same time as Koni FSD shocks. He has Mk II vRS with all the mods. Cheers! :airjock:

PS MP is simply Magic Pearl (escent).

On the subject of the FSD's make sure you get the right size. The Octy is/was fitted with 2 sizes of strut 50 and 55mm IIRC. One of those sizes was out of stock when a person who shall remain nameless checked a few days back.

On the subject of the FSD's make sure you get the right size. The Octy is/was fitted with 2 sizes of strut 50 and 55mm IIRC. One of those sizes was out of stock when a person who shall remain nameless checked a few days back.

Who was that then? :confused:

I couldn't even begin to imagine to be honest.

I have the same problem with mine Revo'd september last year. Worked ok for a while but does seem down on power compared to my brothers car of the same spec.

Had a new air mass sensor fitted under warranty november didnt help much , went back to Revo some settings had changed got them reset but still no real improvement, I thought it was better but when compared with Bruvs and still down on power, 110 mph compared to 120 over same distance.

Going back to revo on Monday to see if t hey know what it is, I will mention split DV and see what they say.

Gaz

The split DV isn't really an issue with REVO but I assume you mean you are going back to your REVO dealer in their capacity as a motor engineer.

I think if your DV was split you would have more indication than just 10mph at the top end.

Do you know what your boost and timing settings are? Are they the same as your brothers?

I have the same problem with mine Revo'd september last year. Worked ok for a while but does seem down on power compared to my brothers car of the same spec.

Had a new air mass sensor fitted under warranty november didnt help much , went back to Revo some settings had changed got them reset but still no real improvement, I thought it was better but when compared with Bruvs and still down on power, 110 mph compared to 120 over same distance.

Going back to revo on Monday to see if t hey know what it is, I will mention split DV and see what they say.

Gaz

If it is a split DV then REVO won't really be able to help you. You can quite easily find out for yourself if you have axle stands and and an hour or so to kill tomorrow and dont mind getting your hands dirty or if you're like me get a mate to do it for you

Went into revo guys today and found that the dv was split did it for free so went into skoda dealers on way back and got them to order a new one . hope to have it fitted by weekend so will let you know if that was the problem.

The setting are the same as my brothers !!!

Gaz

Went into revo guys today and found that the dv was split did it for free so went into skoda dealers on way back and got them to order a new one . hope to have it fitted by weekend so will let you know if that was the problem.

The setting are the same as my brothers !!!

Gaz

Looks like you have the first known split DV on an OctyII vRS even though there seems to be loads on the Golf V GTi.

Hope this solves your loss of power

Oh well at least you know. Probably worth ordering a spare.

Oh well at least you know. Probably worth ordering a spare.

Why do I need to do that, you've got one kicking around in the garage I could have :confused:

Why do I need to do that, you've got one kicking around in the garage I could have :confused:

Just remember that the price is directly linked to your need.