revo stage 2

[P1TT8ULL]

Hello all.

So I've been running stage 2 with bkr8eix plugs for a while now but having a few problems.

When logging with vcds ive discoverd its been misfiring like a pig in the midrange and top end but these misfires don't make any lights come up on the dash or log any codes on the ecu.

Me and my garage tested bkr7,8 and 9 plugs with both OEM and okada coil packs and have found bkr9 plugs with the okada packs to give best result. Midrange misfires have been eliminated but still for them at top end.

Looking at all other logs everything else is working properly but the afr is so far out at the top end its untrue. At some points its dropping into the 9s so even with bkr9s and okada packs there's still not a strong enough spark to ignite the large amount of fuel.

Only way it seems to be able to cure this is with a different map.

Thoughts, opinions and suggestions people??

James

 

[Hurdy]

Hello all.

So I've been running stage 2 with bkr8eix plugs for a while now but having a few problems.

When logging with vcds ive discoverd its been misfiring like a pig in the midrange and top end but these misfires don't make any lights come up on the dash or log any codes on the ecu.

Me and my garage tested bkr7,8 and 9 plugs with both OEM and okada coil packs and have found bkr9 plugs with the okada packs to give best result. Midrange misfires have been eliminated but still for them at top end.

Looking at all other logs everything else is working properly but the afr is so far out at the top end its untrue. At some points its dropping into the 9s so even with bkr9s and okada packs there's still not a strong enough spark to ignite the large amount of fuel.

Only way it seems to be able to cure this is with a different map.

Thoughts, opinions and suggestions people??

James

Have you tried adjusting the gapping on the plugs. A few others have reduced theirs with good results..

Didn't have to do it on my Polo as it wasn't suffering misfires at all.

I do find it strange that some cars suffer and others don't though.

Also have you looked at the valves as the coking is particularly bad on our cars and deposits find their way between the valve seats and the valves stopping full closure. This is part of the reason I put water meth on there to help keep the valves and inlets clean as a whistle.

 

[lucifer666]

Do you have the latest stage 2 map? Theres a new one out now with all factory updates etc included.

When I spoke to revo about their last big update about a year ago now they told me that the misfiring was down to bad design of the engine......plugs sitting in the way of injectors. This can be controlled by the software. Apparently the vw code meant that when a misfire was detected it dumped more fuel in and ended up flooding the engine.
Revo said to me that their new code(not new new code out now butthe last) had these bits of the vw code were re-written so if a soft misfire is detected (btw misfires happen all the time undetected) it would decrease boost and fueling until the threat of a larger misfire is over.


Since this map Ive had only 2 occasions of misfiring properly and that was when it was very wet and rpm was between 2.5k and 3k for over an hour, my belief is the massive heat in that band of the switchover over a period of time affected it. It went into limp mode straight after and shut off the misfiring cylinder as verified by vcds.


Over the 5k miles I have done since then, whilst still being stage 1 ive had the emissions light come on in a steady fashion indicating emmissions levels below threshold value(cat not working?). This was ALWAYS after seady economy driving for a few days at a time e.g when i drove down to paris for a holiday. Rpm was at most 3.5k during this trip as i was being tight. Seat changed the cat after this aswell as oxygen sensor but it didnt work. Came back again after every long (1000) mile economy drive.

Being paranoid by then and still convinced it was down to damage caused by misfiring etc, had the car booked in several times by different dealerships and compression tests done, all coming back fine. I found as long as i gave her a good boot once a week it would be fine.

I then went stage 2 getting a 3" decat downpipe custom made and the stage 2 map. The emmissions light came on again about a week after I had it which didnt make sense because its supposed to have a CEL delete function to make cp for the sports cat or in my case a decat by ticking the computer into thinking its still a std cat. Even said on the website it was suitable for a decat.
Also I have found that the pull from the stage 2 map works for a couple of bursts of acceleration and then almost dies, i have to then back off and then go again. It 100% dosent pull as much as it did when i first loaded the s2 map. Its not a massive difference but is noticable.

I think a combination of 2 things is happening.

1. Heat is affecting the runs and the eninge is being reigned in as heat is built up.

2. As the engine is pushed, misfires are detected and boost reduced giving a loss in performance.

Because of this "intelligent" boost control the potential output of the engine may never be achieved if misfires occur before it reaches 100% power and boost is limited. Its hit and miss on how the engine performs per run

Probably why nobody inc ibizaracebreak has beaten their 1/4 mile time since the new software has been loaded

 

[P1TT8ULL]

Reduced the gap as much as possible.

Cars getting a custom map this week so will see the results and report back.

 

[lucifer666]

make sure you do. Im convinced that the car is being overfuled and the "intelligent boost" system is making it worse.

Do you ever get the cat light on? I.e stedy engine management light. I know vrsy had it on with his decat, meaning its the sports cat and not the software which is responsible for the light not being triggered.

I know when the light comes on it operates something called fuel vapour recirculation or something along those lines. Let us know how it goes

 

[P1TT8ULL]

No never had a cat issue. Well never had the light or any fault codes but that means sod all with these cars.

However the plot thickens. My guys have been trying to map the car most of the week however it appears Revo have put something into the software which stops any map being accepted by the car.

This now means I've either got to get Revo to put my original software on not just the Revo map that emulates stock, pay 250 quid for the software from Skoda or try get it in a dealership and let them upload the latest software so that my guys can put there map on it.

 

[vRSy]

at Lucifer, i had the light on temporarily, however that was because the software hadn't turned off all the cat sensors. Essentially loads of the built in tests utilise the lambda sensors and they hadn't managed to re-write them all. A quick revision of the map identified the final one that had been missed and it never reappeared.

@Pitt8ull

This is a frequent problem with guys moving on from REVO. The bigger companies have the equipment which means they can write straight over the top of the map, but alot of the smaller ones dont have that capability and need the stock version installing first. Ive seen this on Briskoda and the GTI forum on many occasions. tjis used to be a regular occurrence after people had tried the trial REVO map.

Does your company have the decryption software for the ECU or were they planning on mapping via the OBD after the REVO software bypassed it? Just thinking that if you reload the OEM software, it will remove the REVO bypass as well and reinstall the OEM encryption, so they will have to open the ecu and load it in boot mode.

 

[P1TT8ULL]

They're doing it by opening it up. They have put there map on but had to install certain other files to make it work. So he's asked if I can get the stock software put back so that he's 100% sure there's nothing else in the background that will cause problems later down the line. He could have quite easily given me the car back as is and taken me money but its not what there about. Considering there normal stuff is Ferraris, Bentley's and an 800+bhp cayenne he's quite interested in the Skoda.

 

[lucifer666]

Any update on your mapping etc?

Got a log of my AFR measured and requested. Seem to always match under full throttle apart from a couple of points where the measured is higher, not lower like you have found.
There were 170 points plotted on this graph which is under full load over the course of a 200mile journey.

There are a few random points creating the spikes in this graph, when I looked at the data, there were about 9 points that didnt follow the trend.
Are these misfires? Or ecu reducing fueling?.....because its a deliberate act by the ecu as it follows the commanded AFR so it wasnt something that wasnt meant to happen, it was requested.......why

 

[Big-Pete]

Sorry to Necro, I'm having mid range splutter, pretty sure it's a misfire, but my bkr7s have only done 2K,
I'm on a custom map with 230bhp, and was wondering if it's worth me going to 8s? I'm going to change coil packs to a set of Bosch ones aswell as I don't have hurdys pockets for okadas

 

[queen]

Pete you should log to see what exactly happens. No need for the 8's just go for the better beru coils if you don't have them, part number: ZSE030, but better log and see what cylinder misfires, change that specific cylinder's plug&coil and flip them with another cylinder and see if the misfires follow.

 

[Big-Pete]

Pete you should log to see what exactly happens. No need for the 8's just go for the better beru coils if you don't have them, part number: ZSE030, but better log and see what cylinder misfires, change that specific cylinder's plug&coil and flip them with another cylinder and see if the misfires follow.

cheers nassia, are the beru coils better than bosch?!

cant really log atm, weather is ****, and im working, just want it running perfect for next time im out in it. (trax/25/9)

 

[queen]

cheers nassia, are the beru coils better than bosch?!

cant really log atm, weather is ****, and im working, just want it running perfect for next time im out in it. (trax/25/9)

Supposedly yes, if you can give me the part number I can check.
BERU is a Registered Trademark of BorgWarner BERU Systems GmbH, German brand, BorgWarner is the main manufacturer of VAG turbos.
Oh ok, maybe you can log it on the dyno for a fee (you or your tuner)? At least that's what we do here if we can't log it on the road.