Failed remapping

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Dan S4

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This has both the mapper and myself a bit puzzled.

I tool my S4 in to a local mapper (used them many times and always are great) yesterday for a stage 2 map, but they struggled to get a map on to it as the car wouldn't respond.
They checked the current ecu programme and it showed that it was standard, the boost was increased but the car wouln't respond, no matter what tweaks they did the car wouldn't take onboard the changes, the only error it had was a knock senor (which i will change).
The odd thing about it is the car is putting out 435bhp as 'standard' as there is no indication of a map.
Could it be possible a remap has been hidden in the ecu somewhere? Or knock sensor error won't let the ecu make any changes?
Also had a gearbox map which has made a noticeable difference, so its well worth it.

Any ideas would be great to get the map sorted extra bhp out of her.
 
Could it be a limit has been reached ?
I think certain types of EEPROM chips have limited write cycles.
 
AlS3BE said:
Could it be a limit has been reached ?
I think certain types of EEPROM chips have limited write cycles.
Click to expand...
I think the map was being uploaded ok but the car wouldn't take on board the changes. A bit like talking to my 3 year old, listens but just ignores me.
 
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Check for a plugin map box.

However, whats the stock figures?

All engine errors have to be cleared before mapping, your mapper should know better tbh, never map a car with faults imho.
 
Neither of us have noticed any plug in devices, i will have another scout around.

The stock figure should be 333bhp but my 'stock' figure is 435bhp, with the few mods i have done.
 
It was boosting fine up to 'x' but after that it wouldn't increase the boost any further.
I need to change the pcv and knock sensor so when I get round to that i will have a check of other parts too.

Just had another quic look around and can't see any plug in boxes.
 
Dan S4 said:
It was boosting fine up to 'x' but after that it wouldn't increase the boost any further.
I need to change the pcv and knock sensor so when I get round to that i will have a check of other parts too.

Just had another quic look around and can't see any plug in boxes.
Click to expand...

Don’t know if this applies to vag cars but back in the days the subarus needed an aftermarket map sensor for remap if you run too much boost as the stock map sensor could only read so much then it starts to limits boost, fuelling after certain amount of boost. Think it was 2 bar but don’t quote me on that.
Your problems sounds similar.
 
Could be a possibility; will have a look in to that. Didn't think that it was required on these but could be wrong.
 
No way you're getting 100bhp more from non mapping upgrades, it has to of been mapped already & ecu locked.

Whose your mapper?
 
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NHN said:
No way you're getting 100bhp more from non mapping upgrades, it has to of been mapped already & ecu locked.

Whose your mapper?
Click to expand...
That's what we cannot understand, the ecu shows as not mapped but the power suggests it is. Just from the mods I would expect say 30bhp but not 100bhp.

Only possible way around it, i can think of is a full ecu wipe or new (second hand ecu, with same spec) and try to map that.

I use map-tech in Brigg, always been spot on and knows his stuff.
 
Get audi to reload ecu to stock, pure stock, if they're willing, then start afresh, but it has to of been mapped & with respect, if he's that good & not a virtual mapper, basically file jockey, then he should of advised or actually done the next step already.

Maybe talk to rick @ unicorn as he is by many, an authority on mapping & builds his own maps afaik.
 
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NHN said:
Get audi to reload ecu to stock, pure stock, if they're willing, then start afresh, but it has to of been mapped & with respect, if he's that good & not a virtual mapper, basically file jockey, then he should of advised or actually done the next step already.

Maybe talk to rick @ unicorn as he is by many, an authority on mapping & builds his own maps afaik.
Click to expand...
I will give Audi a try and see if they may be willing to assist with resetting the ecu and look to possibly go to / speak with unicorn.
 
Like others have said, there is no way a ‘stock’ S4 would be running 435ps.

I would call a few mappers around as some do lock ECUs for any further ‘writes’. MRC is one such example, they lock the ECU after the remap and IIRC I am sure Rick (Unicorn) won’t be able to access it as he did come across this issue in the past with someone who wanted to go from MRC stage 2 to Dual Pulley, uprated HPFP and gutted / sports cats (I don’t remember exactly which ones) and test pipes. At the time MRC were having issues with another DP car and were simply not willing to do it for them until they had sorted out the issues on the test car.

I’d start with calling MRC first and then work you way through different options.


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V6_Man said:
Like others have said, there is no way a ‘stock’ S4 would be running 435ps.

I would call a few mappers around as some do lock ECUs for any further ‘writes’. MRC is one such example, they lock the ECU after the remap and IIRC I am sure Rick (Unicorn) won’t be able to access it as he did come across this issue in the past with someone who wanted to go from MRC stage 2 to Dual Pulley, uprated HPFP and gutted / sports cats (I don’t remember exactly which ones) and test pipes. At the time MRC were having issues with another DP car and were simply not willing to do it for them until they had sorted out the issues on the test car.

I’d start with calling MRC first and then work you way through different options.


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Click to expand...
cheers, it is looking like that is the way forward.

The mapper did have the ecu out trying all different things, but to no avail :(

As it is now and the TCU tune, I am fairly happy, just chasing the extra say 50bhp.

I need to do some work to the engine anyway so will get that done then look to chase the additional.
 
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Dan S4 said:
cheers, it is looking like that is the way forward.

The mapper did have the ecu out trying all different things, but to no avail :(

As it is now and the TCU tune, I am fairly happy, just chasing the extra say 50bhp.

I need to do some work to the engine anyway so will get that done then look to chase the additional.
Click to expand...

All the best and for the money involved to get the extra 50ps, I don’t think it is worth it .

These numbers can be all subjective depending on the dyno used, the conditions on the day and different variables set by the tuner / dyno tech. I have ran 405ps, 445ps, 475ps, 491ps and 530ps on 3 different dynos on a stage 2 car. There are too many variables involved and one should always take these numbers with a pinch of salt .

Imho, a good test would be a either a butt dyno or a couple of draggy runs.


Sent from my iPhone using Tapatalk
 
Dan S4 said:
It was boosting fine up to 'x' but after that it wouldn't increase the boost any further.
I need to change the pcv and knock sensor so when I get round to that i will have a check of other parts too.

Just had another quic look around and can't see any plug in boxes.
Click to expand...
What was X?
It would have been limited by the bypass valve.
If the 435bhp was measured on a dyno then it has to be mapped already - no way to get to that power no matter what the mods are without the ECU holding the bypass valve closed and that can only be achieved with a remap.
If you can access VCDS or a similar tool then you can check the ECU flash status.
 
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If the previous mapper locked the file you most probably be able to read the file off the ecu. But you can always write a new file to it replacing the old one, if not the previous mapper has done something really stupid.
How do you know the previous file is the stock file? If the car puts out 435 bhp it is for shure remapped, but if you can read the file that it is currently running and comparing the tables with a stock file you could easily figure out if it is remapped or not.
I'd say swap the faulty knock sensor and then take the car to someone who knows their way around this ecu.
 
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audi upgrades
V6_Man said:
All the best and for the money involved to get the extra 50ps, I don’t think it is worth it .

These numbers can be all subjective depending on the dyno used, the conditions on the day and different variables set by the tuner / dyno tech. I have ran 405ps, 445ps, 475ps, 491ps and 530ps on 3 different dynos on a stage 2 car. There are too many variables involved and one should always take these numbers with a pinch of salt .

Imho, a good test would be a either a butt dyno or a couple of draggy runs.


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Click to expand...
I agree; you have, in effect, already got an extra 100BHP free of charge. Chasing an extra 50BHP might prove illusory and very expensive; a classic example of the law of diminishing returns. Enjoy what you have and put the money you haven't spent into enhancing the car in other ways. :)
 
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LarsE said:
If the previous mapper locked the file you most probably be able to read the file off the ecu. But you can always write a new file to it replacing the old one, if not the previous mapper has done something really stupid.
How do you know the previous file is the stock file? If the car puts out 435 bhp it is for shure remapped, but if you can read the file that it is currently running and comparing the tables with a stock file you could easily figure out if it is remapped or not.
I'd say swap the faulty knock sensor and then take the car to someone who knows their way around this ecu.
Click to expand...
The mapper compared the current 'table' on the ecu to a standard table; they were both very similar and little had changed, which makes the car look stock.

will change the knock sensor and pcv etc all in one go (burning oil and minor water loss) so want to check a few things out including the supercharger coolers; will do all the bits and take it somewhere else as suggested.
 
jdp1962 said:
I agree; you have, in effect, already got an extra 100BHP free of charge. Chasing an extra 50BHP might prove illusory and very expensive; a classic example of the law of diminishing returns. Enjoy what you have and put the money you haven't spent into enhancing the car in other ways. :)
Click to expand...
I know what you saying dude, but I really want that extra 50 BHP :D just because I know it's there to be had.
 
The primary change on a stage 1 map is the point at which the bypass valve opens, there is little at the low end that is different which is why I expect it looks "stock"
 
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