hey guys,,i had my 2003 vrs octavia remapped recently by a local mapper,,a gut with a fairly good rep when it comes to remappin,,well so i thought, anyways since he done the remap the car is acting a bit odd when i plant the shoe and accelerate hard,,,,its almost as if its jumping up through the rev range or kangarooing ?? if that makes sense,,,its like the acc pedal is being pumped ,,but its not,,its on te floor,,, im pleased with he power and mpg seems to have got better,,, im just wondering could this be an n75 valve(boost control valve) failure,or mabye clutch, dmf?, or mabye the map itself >? what do yous think? ps the car is totally standard aprt from the remap,,thanks

Have you uprated the DV at all?

Have you checked for any split hoses?

When I first had mine, still does it a bit now, as the turbo dies off it seems to be a relay race. The Turbo dies off then there is a slight pause as the power is handed back over to the engine then the power starts again. This was really noticeable when I first got the car but now you barely notice it. I think maps take time to bed on some occasions.

ya ive heard this too DBP,,, some one said to me that it takes a few hundred mile for the map to adjust properly,,, i checked for split hoses,,all is ok,,bu i still have the standard dv installed,,,mabye i should upgrade due to the map

I read over on ukmkiv's theres a problem with the stock software that becomes more apparent with a remap

This can be mapped out, r-tech were calling in gen6 or something, totally above my head tbh, who mapped it?

a local mapper,,,here in ireland.,, he has a fairly professioanl set up and claimed he is at it years,,,iv read reports also about him on various forums and all is good with him

Call back to the mapper, explain the problem and he might be able help you troubleshoot at the very least he should be able to scan it for error codes and point you in the right direction.

MIne does this also through the rev range as you say it feels like the boost is on and off, is it called boost surge?

This is a common problem when re mapping the 1.8t. Search on here for boost surge. There are many threads on the subject. Mine suffered this after being mapped. It was the map exaggerating the boost surge issue. However my mapper spent time solving the problem and now it's perfect.

worth getting the car scanned, mapping can damage the coilpacks too

Could be the wrong software for your ECU. I had similar problem on a mkiv Anniversary which kandaroo'd horribly after being remapped, & turned out to be the map had the wrong software. If your OEM DV seal is ok then it's absolutely fine with stage 1 remap. If the seal is goosed you normally hear a chattering sound under boost.

Shark have fixed this issue on their vRS map. They spent a lot of time and effort fixing it, so maybe ring them if you want some advice on the topic.

My car took 6 months to develop the boost surge, and it got progressively worse from there. I now have the latest map from Shark and it's completely surge-less. It's flawless.

I'm no expert on the issue, but it can happen with any car and any remap. Only a few tuners have put in the effort to investigate and fix it (Mikko from Shark Performance being the main one).

You don't need an aftermarket DV for a Stage 1 remap. You don't need to change anything actually, that's why it's a Stage 1. I'm planning to put my standard Bosch DV back on the car.

P.S. Don't be tempted to randomly start replacing sensors and valves. Wait until it can be properly diagnosed. So many people waste money on new N75's and MAF's when they're not needed.

R-tech discovered the problem in 2006 and i beleive they worked on it for 7 months to irradicate it completely!

The problem is that the description of the issue can actually relate to a number of problems. There is certainly the factor that some versions of the stock ECU software does cause bad boost fluctuation, which is then hugely more noticeable after a remap. (and as has been said, some good remappers like Shark can 'flash' this problem out as part of the process of getting a remap).

But also worth saying that whilst Bodge is right, it's a bad idea to start changing random parts, the fact is that the N75 controller can cause the problem you are describing, as can a faulty / dirty MAF, and as can a dirty Throttle Body.

I got my VRS remapped 2 weeks ago, and immediately had bad stutters and hesitation under engine load. I was sure it was map related, but in the end it proved to be completely and utterly resolved by a new MAF, a thorough clean of the Throttle Body, and a high quality fuel injector cleaning treatment. Absolutely smooth boost and power delivery with no stutters, with a remap.

One good test would be to unplug your MAF plug and drive your car........ when I done this, the surging completely disappeared so I knew I had a MAF failure of sorts. The throttle body clean and injector cleaning was more just to make sure all bases were covered. Good luck mate.

Edited 22 May, 201214 yr by Longyear

The problem is that the description of the issue can actually relate to a number of problems. There is certainly the factor that some versions of the stock ECU software does cause bad boost fluctuation, which is then hugely more noticeable after a remap. (and as has been said, some good remappers like Shark can 'flash' this problem out as part of the process of getting a remap).

But also worth saying that whilst Bodge is right, it's a bad idea to start changing random parts, the fact is that the N75 controller can cause the problem you are describing, as can a faulty / dirty MAF, and as can a dirty Throttle Body.

I got my VRS remapped 2 weeks ago, and immediately had bad stutters and hesitation under engine load. I was sure it was map related, but in the end it proved to be completely and utterly resolved by a new MAF, a thorough clean of the Throttle Body, and a high quality fuel injector cleaning treatment. Absolutely smooth boost and power delivery with no stutters, with a remap.

One good test would be to unplug your MAF plug and drive your car........ when I done this, the surging completely disappeared so I knew I had a MAF failure of sorts. The throttle body clean and injector cleaning was more just to make sure all bases were covered. Good luck mate.

i acutally unplugged the maf as soon as it started happening and still no joy... i cleaned the throttle body ,,it was really clean anyways,,and my car only got a new set of sparks a couple of thousand miles ago.... i havent inspected the vacum pipes yet,, and i doubt its coil pack related,, its really annoying as when i first got the remap done it ran very good for 2 days then it started its kangarooing

Well with the MAF, Throttle Body and spark plugs ruled out, I would be looking to borrow a N75 valve from another VRS owner and trying it on your car. (it's a 15 min job max to change them, even if the hose fasteners can be a pain!)..... The N75 can control the wastegate and release all of the boost from your turbo, (particularly if it suspects an overboost, which sometimes happens after a remap). Thus if the N75 keeps 'kicking out your turbo' you'll get the 'power kangarooing'.

You can get a new N75 for £35 but I wouldn't do that personally until I had tested one first. If it is not the N75, and not the previous suspects, I would guess you have the dodgy stock ECU software that contains the fundamental 'boost intermittancy' for reasons unknown. Someone like Shark or R-Tech can flash/map that out, as part of a remap package.

Edited 23 May, 201214 yr by Longyear