I was being tailgated last Friday, really badly, for no apparent reason, which gave me a touch of red mist, so decided to accelerate away, quite hard (poor car).

Anyway, I'm sure there was a noise, followed by a rougher engine note. I had the radio up loud so can't be 100% sure. Eveything seems OK, no warning lights, the car starts, goes and stops but it no longer seems to have the acceleration since coming back from Jabba.

I have been thinking since Friday that it's just me and I have become used to the faster acceleration, but this morning called for some speed when joining the motorway, and it was struggling, I had to change down! This was the benefit of the remap for me, is that to go quickly, there was no longer a need to change down and drive it hard.

Its a 4x4 and has had no other mods, such as a new dump valve. Can a duff dump valve cause a drop in performance yet enabling the car to still drive OK??

Yes it can - since it would cause a boost leak if jammed open. Also check for any boost hoses popped off.

Is your engine check light on?

from what i know i'm sure a faulty dumpvalve will have an effect of some description.

if the dumpvalve isn't holding the increased pressure then "boost" will be leaking so hence reduction in power.

i'm no expert by the way,perhaps a friendly PM to a certain member might be of use????

No warning lights are on, I also can't hear any "escaping air" type noise, should I?

So a trip to the dealer may be necessary.

You'd be unlikely to hear anything from inside the car, and revving the engine by hand probably won't show anything up either, since the turbo won't be under load.

What kind of DV is it?

I suggest a call to Jabba. If you have had no mods other than the remap I agree that the DV is a likely cause. I have a bailey.

Having said that, some days my car feels like it's been un-re-mapped. I'm not too sure if its just me getting used to it or if it's a glitch in the remapping. For example, the other day on the way home from work I pulled out to overtake a van at 40mph, floored it in 3rd and it took bloody ages to get past. Another day, on my regular route I was pushing quite hard and it just diddnt seem to have the guts it usually has.

I know that I'm not the only one on here who has had such experiences, its been posted here before and the general opinion has been that you get used to the power after a while.

One day when its feeling not so fast I'll pull over, turn off then back on to see if it makes a difference.

I suggest a call to Jabba. If you have had no mods other than the remap I agree that the DV is a likely cause.

Having said that' date=' some days my car feels like it's been un-re-mapped. I'm not too sure if its just me getting used to it or if it's a glitch in the remapping. For example, the other day on the way home from work I pulled out to overtake a van at 40mph, floored it in 3rd and it took bloody ages to get past. Another day, on my regular route I was pushing quite hard and it just diddnt seem to have the guts it usually has.

I know that I'm not the only one on here who has had such experiences, its been posted here before and the general opinion has been that you get used to the power after a while.

One day when its feeling not so fast I'll pull over, turn off then back on to see if it makes a difference.[/quote']

What fuel are you using and how much was left in the tank?

Just out of interest.

You do get use to it.....I also regularly "feel" performance is reduced when I have half a tankful or less. A few people have experienced this so I'm not imagining it. It's been suggested that on a remapped car the standard fuel pump cannot keep up...have talked to Jabba about this perviously and will ask again.

Good point, Adrian.

I have used only BP Ultimate since the remap, the map was done for this octane level.

I have to say that I havent' noted the fuel level when the car is "slower". It's interesting though, I'll look in future.

I'm going to be fitting boost and oil pressure gauges in the next couple of weeks, I expect this will allow easier monitoring of the remap results.

Having said that' date=' some days my car feels like it's been un-re-mapped. I'm not too sure if its just me getting used to it or if it's a glitch in the remapping. For example, the other day on the way home from work I pulled out to overtake a van at 40mph, floored it in 3rd and it took bloody ages to get past. Another day, on my regular route I was pushing quite hard and it just diddnt seem to have the guts it usually has.

I know that I'm not the only one on here who has had such experiences, its been posted here before and the general opinion has been that you get used to the power after a while.[/quote']

This is exactly why I am undecided whether to do anything about it. Have I just got used to it now?

This forum's great for the help and advice you can get here by the way, cheers

What fuel are you using and how much was left in the tank?

Just out of interest.

You do get use to it.....I also regularly "feel" performance is reduced when I have half a tankful or less. A few people have experienced this so I'm not imagining it. It's been suggested that on a remapped car the standard fuel pump cannot keep up...have talked to Jabba about this perviously and will ask again.

Fuel pump was broke on mine, according to the Skoda dealer who supplied the new pump it's very common on the 4x4's.

I was thinking about this on the way home yesterday evening and suddenly thought of something.....

.....the ECU is adaptive and I have found that if you drive with economy in mind the car will react in this manner even when you boot it.....it expects you to drive tamely and reacts as such.

Driving briskly I have also found that performance is as I expect is to be.

Hope this makes sense.....perhaps this is what you guys are experiencing.

.....the ECU is adaptive and I have found that if you drive with economy in mind the car will react in this manner even when you boot it.....it expects you to drive tamely and reacts as such.

Driving briskly I have also found that performance is as I expect is to be.

I recall some members who went to the track day at Bruntingthorpe later commenting that their cars were noticeably livelier subsequently - which backs up what you say about adapting' date=' Adrian.

Fuel pump was broke on mine, according to the Skoda dealer who supplied the new pump it's very common on the 4x4's.

I've just had a look at ETKA. The 4X4 has a different 3.0BAR fuel pump to FWD Octavias. :(

i have notice also my car does feel faster when i have a full fuel tank, opposite to what it should be i guess with the added weight of the fuel but maybe the fuel pump isnt good enough :confused:

Right, heres an update.

Yesterday morning I drove the mother in law to the station and hence, slowly/economically. Once I'd done so I drove straight down to Oxford, went to pull away and it was hopeless. I found a quiet stretch of road, cruised at 30 in second and floored it, the turbo hardly whistled and acceleration was lame.

I stopped, turned off the engine/ignition and restarted straight away. did the same test and the turbo whistled as the car pulled really hard once again.

I had half a tank of BP Ultimate in the car at the time.

I wonder if the ECU adaptiveness is exagerated by the re-map?

I've just had a look at ETKA. The 4X4 has a different 3.0BAR fuel pump to FWD Octavias. :(

Is the FWD FP a 3.0bar also?

all octys are 3.0 bar fpr as std.. revo can map to 4bar

all octys are 3.0 bar fpr as std.. revo can map to 4bar

Yep, in stock mode the faulty pump wasn't apparent, but in performance mode with the 4bar FPR the problem was very noticeable.

Same problem replicated this morning. It seems that if I drive below 3k rpm for 3-4 miles then put my foot down, its like the turbo itn't doing anything. Switch off then on again and it solves the problem.

It seems to only do this when the car has been sat for a long time overnight or at work etc.

If I get in the car and drive briskly as soon as it's warm then I have no problem.

Going to check this each day next week to see if the problem is consistently repeatable the I can see a call to Jabba coming up :(

Is the FWD FP a 3.0bar also?

3.0bar fuel pump too - yes.

Goochie, I am beginning to believe this when I consider my driving style.

When I drive to work in the mornings I drive very sedately because I am driving through a residential area, past a school etc. Also the car is stone cold. When I reach the motorway and want some speed, this is when I have found the lack of power.

Driving home, my work is right next to the motorway slip road (it's more like a short stretch of dual carriagway), and the car will pull much more than it does in the mornings. Maybe due to the fact I haven't driven it slowly since starting it?

I'll be interested to see how your experiment goes.

Drove to Homebase at the weekend, cold morning, cold start I drove below 2500rpm and 30mph for about 4 miles. Put my foot down on the ring road in second and there was no turbo noise and a distinct lack of power.

Pulled into a side road, turned ignition/engine off then straight back on again. Back onto the ring road and the car returned to its usual torque steer, full boost antics.

This was with a full tank of BP Ultimate.

I emailed Jabba about this and here is the very helpful reply

Hope this information helps, it's come from Michael who does the mapping.

This is a common problem with VVT 150 & 180 bhp engines 30% of cars over

30,000 miles coming in for re - maps will have the fault code logged boost

pressure loss between turbo & throttle when in reality there is no leak,

once triggered the turbo will run actuator pressure until you turn the

ignition off then on again. To alleviate the problem remove the boost pipe

to the throttle body, push the throttle flap open & wipe round with a cloth,

remove any accumulated sludge wetting the cloth with petrol or carb cleaner,

do not use tissue as it can break up & get left in the inlet manifold. Re

fit the boost pipe then turn on the ignition, but do not start engine leave

for 2 - 3 minutes before starting the engine. As mentioned earlier, it's a

common problem on standard cars, but less noticeable as the boost difference

between the standard 0.6 bar & 0.35 actuator pressure.

I emailed Jabba about this and here is the very helpful reply

so did it work?

It was a little too cold to be outside after work last night. I'll try it later in the week (weather permitting)

Its funny about the ECU being adaptive because i find that sensible driving and then wanting to go brisk - the car is definitely slower. When driving quick - the pick up is considerably increased. I have also found that when on the motorway driving at ( hyperthetically ) 100mph plus with regular slow downs because of beamers lol, that acceleration upwards to 140 is very impressive. I also notice a difference when using shell optimax compared to tesco's own. :eek: