Pro Boost FSI remap

A2Steve

A2OC Donor
They do and have for quite some time Steve. Given that they know their stuff when it comes to A2s, it would be useful for you to have a chat with Vince at Stealth and compare the two remapping protocols...


Sent from my iPhone using Tapatalk
That would be a little difficult as I have no skills in relation to remapping at all. I can barely work my way around most computer programmes :)

My aim in this process is simply to be the middle man to give the U.K. based club access to the remap at a lower cost than sending your ecu to Germany yourself and with no downtime for your car being usable and on the road.
 

PlasticMac

Member
The two approaches seem to be different. The ProBoost map addresses the manifold issues, sticky flaps etc, while the purpose of the Stealth map, based on the sketchy feedback I've read here, is to increase power/performance. Given that the "target audience" now (compared to the mid noughties), are high mileage cars, the well proven ProBoost map makes more sense to me. I'm very happy with the performance of my standard FSI, and certainly don't feel the need to tune it. If I did, I'd only consider a map with a proven, satisfied, user base, which ProBoost has.
Mac.
 

Jellybean

Admin Team
The two approaches seem to be different. The ProBoost map addresses the manifold issues, sticky flaps etc, while the purpose of the Stealth map, based on the sketchy feedback I've read here, is to increase power/performance. Given that the "target audience" now (compared to the mid noughties), are high mileage cars, the well proven ProBoost map makes more sense to me. I'm very happy with the performance of my standard FSI, and certainly don't feel the need to tune it. If I did, I'd only consider a map with a proven, satisfied, user base, which ProBoost has.
Mac.
As I recall the ProBoost map does give a slight increase in performance as ignition is optimised to the cam timing.

Sent from my SM-N960F using Tapatalk
 

PlasticMac

Member
As I recall the ProBoost map does give a slight increase in performance as ignition is optimised to the cam timing.

Sent from my SM-N960F using Tapatalk
You may be right, all I'm saying is that performance enhancement is not the primary aim of the ProBoost map (whereas the Stealth map, I think, was).
Any gain over an FSI, in good fettle, on 98 octane and OEM map will be marginal at best. In my opinion.
Mac.
 

Ian Bigg

Member
By rule of thumb a N/A remap will give a 10% gain so APPROX 10-11bhp and a similar gain in torque, obviously that is on a good engine .
 

A2Steve

A2OC Donor
The first batch of ECU's arrived yesterday, one will be on its way to @Spen tomorrow, the other will be collected by @Jellybean in the next few days. Hopefully if I can get my high pressure fuel pump back up and running tomorrow i'll start testing the 3rd one in my car from tomorrow.

Adrian has purchased another 5 ECU's in anticipation of any further requests, so please let me know if you wish to purchase one and i'll ask for the next batch to be sent.
 

steaman

A2OC Donor
Pro Boost FSI remap, first impression.

My ECU is back from remap so I took it for a short drive.

The reason for my remap was to cure a faulty NOX sensor. Beside that my engine worked flawlessly, as good as a 17 year old 1.6 Fsi can be.

After starting the engine the engine management light goes out, fine! During the drive I could not notice any difference compared to before the remap. I would suspect that any difference in behaviour would be in the range where the engine in the past where running stratified combustion, low to moderate load below 3000 rpm.
I will take a longer test drive tomorrow and also see what happens when I disconnect the NOx control module.
I also scanned the ECU for errors, but it was clean.

So far I am compleately satisfied.
 

A2Steve

A2OC Donor
Pro Boost FSI remap, first impression.

My ECU is back from remap so I took it for a short drive.

The reason for my remap was to cure a faulty NOX sensor. Beside that my engine worked flawlessly, as good as a 17 year old 1.6 Fsi can be.

After starting the engine the engine management light goes out, fine! During the drive I could not notice any difference compared to before the remap. I would suspect that any difference in behaviour would be in the range where the engine in the past where running stratified combustion, low to moderate load below 3000 rpm.
I will take a longer test drive tomorrow and also see what happens when I disconnect the NOx control module.
I also scanned the ECU for errors, but it was clean.

So far I am compleately satisfied.
And hopefully this is what we wanted to achieve. A car that otherwise drives exactly as an FSI should but without the risks of stuck flaps or blown coolant hoses.

Looking forward to trying mine out now.
 

Robin_Cox

Member
I'm not an FSI afficionado, but if this proves to be the fix to the FSi 'problem', it could well be a saviour to a significant number of cars otherwise ending up on Ebay / Autotrader / Gumtree for £500 or less on low mileage - or £1500 with a piece of tape in the dashboard - due to "irreparable engine warning lights", as well as lack of proper maintenance / servicing and 98-99 octane fuel. Fantastic effort @A2Steve.
 

Robin_Cox

Member
Would never have guessed that ... !
Mac.
I like A2s, pure and simple. In my research buying one to begin with I edged towards the Tdi75 based on everything I read here, and elsewhere suggesting that it was the proverbial cockroach in the nuclear holocaust (ie, bombproof), whereas the suggestion at large (if you aren't a competent mechanic) was that the Fsi (of which there were loads in various degrees of tempting affordability on Autotrader etc. at the same time) was a ticking time-bomb to avoid at all costs, largely due to poor maintenance or economising on premium fuel by early owners (FSis seem to be on ~3-5 owners at least by now), and the manifold flaps issue. It is of huge significance (especially from a sustainability perspective in this day and age) that the model that has been most crippled by one particular problem - can now be resolved by a software update to resolve aspects of this issue without invalidating the other plus points of the car - and if I was in a position to look for another car now, I would be substantially less hesitant in picking up a bargain FSi (and getting @A2Steve to provide an updated ECU) than I would have been otherwise a few months ago. Brilliant development.
 

steaman

A2OC Donor
Pro Boost FSI remap, first impression.

My ECU is back from remap so I took it for a short drive.

The reason for my remap was to cure a faulty NOX sensor. Beside that my engine worked flawlessly, as good as a 17 year old 1.6 Fsi can be.

After starting the engine the engine management light goes out, fine! During the drive I could not notice any difference compared to before the remap. I would suspect that any difference in behaviour would be in the range where the engine in the past where running stratified combustion, low to moderate load below 3000 rpm.
I will take a longer test drive tomorrow and also see what happens when I disconnect the NOx control module.
I also scanned the ECU for errors, but it was clean.

So far I am compleately satisfied.
Yesterday I had more time to test the engine and I made two observations:
  • At speeds below 3000 rpm the torque seems to have improved slightly.
  • It feels like the threshold at 3000 rpm is still there
 

A2Steve

A2OC Donor
Yesterday I had more time to test the engine and I made two observations:
  • At speeds below 3000 rpm the torque seems to have improved slightly.
  • It feels like the threshold at 3000 rpm is still there
Have you played about with disconnecting the Nox sensor yet?
 

ajsellors

A2OC Donor
Have you played about with disconnecting the Nox sensor yet?
The NOX sensor also combines the post-cat lambda sensor in one unit so disconnecting it completely will throw a lambda sensor engine management fault. As it is not connected directly to the engine ECU but has its own ECU, I'm not sure how easy it would be to replace with a "standard" lambda only sensor.

The wiring from the NOX ECU in the schematics suggests separate connections for the lambda and NOX parts of the sensor but all the FSI sensors I have seen have less wires than in the schematic suggesting that the connections are combined in some way. I haven't looked into it in more detail though.

Assuming that the connections will work are as the schematic and the ECU remap will ignore the NOX sensor open circuit error, it may be possible to rewire a 4 wire lambda sensor to the old NOX sensor plug and use a much cheaper sensor as a replacement. The lambda/NOX sensor is unique to the A2 FSI and not used on any other VAG cars!

regards

Andrew
 

tch

Member
The NOX sensor also combines the post-cat lambda sensor in one unit so disconnecting it completely will throw a lambda sensor engine management fault. As it is not connected directly to the engine ECU but has its own ECU, I'm not sure how easy it would be to replace with a "standard" lambda only sensor.

The wiring from the NOX ECU in the schematics suggests separate connections for the lambda and NOX parts of the sensor but all the FSI sensors I have seen have less wires than in the schematic suggesting that the connections are combined in some way. I haven't looked into it in more detail though.

Assuming that the connections will work are as the schematic and the ECU remap will ignore the NOX sensor open circuit error, it may be possible to rewire a 4 wire lambda sensor to the old NOX sensor plug and use a much cheaper sensor as a replacement. The lambda/NOX sensor is unique to the A2 FSI and not used on any other VAG cars!

regards

Andrew
 

Edwrai

Member
It’s quite easy, I have done this on my avy build, if I remember it’s just 2 wires from that go to the nox controller and power and earth.

Why would you want to however?


Sent from my iPhone using Tapatalk
 

tch

Member
Hi, the statement that 'The lambda/NOX sensor is unique to the A2 FSI and not used on any other VAG cars!' is incorrect, this type of NTK sensor is used on some variants of the VW Golf 1.6 FSI under NTK part number NZA04-V1. In fact the only difference in the sensors fitted on Golf & A2 FSI is the length of cable that plugs into NOX controller (the A2 one is longer & has a rubber sealing boot on it- the electrical wire colouring & end plug is the same). I fitted a VW Golf NOX sensor to my A2 FSI around two years ago by splicing the electrical cable from original sensor onto the Golf sensor & it has been fine ever since. If you're patient & keep a look out on ebay a new Golf NOX sensor can be bought for under £100.
 

steaman

A2OC Donor
Have you played about with disconnecting the Nox sensor yet?
Yes!

  • I disconnected the NOx/Lambda Sensor from the NOx Controller and started the engine, no error code!
  • I then disconnected the NOx Controller and started the engine, no error code!
  • A 5 minute test run did not trigger any error codes either. Otherwise I did not notice any different in the engine behavior.
 
Last edited:
Top