New turbo

Boltz said:
“I’ve come on here for a bit of help , not to be told I’ve made a mistake ..... I bloody know that !”

You will get help on here but you are not very forthcoming with the details such as is your car a 18, 20 or a 28i....what map did you have done stage 1?, was the car dyno’d giving you before and after results? What BHP and torque values were you told you would have when the map was done? What is the service history?, how long have you owned the car ?, any other modifications? What if any warranties did the mapping company give you. What did the car drive like after the map etc
There are many owners of remapped E89s on here including myself that have not had any issues.
There are excellent mapping companies and individuals out there but also there are some cowboys
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Ok :)

Car is 20i , stage 1 remap , no Dyno, it was a mobile remap company . Bhp 189-260 torque 270 - 420 .
Full service history but due one this month , bought car June 2020 , no mods , company gave 30 day money back guarantee and take off the map . The car was rapid after the map but the siren came just ten days after it was done . :x
 
R60BBA said:
xenomorph1 said:
R60BBA said:
Who remapped the car?
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I’m still trying to get them to cough up for it so I can’t really say yet :poke:
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They won’t accept liability mate.

You might as-well name the company so that other forum members know to avoid them.
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I’m still in conversation with them atm and they haven’t said they wont help me yet so I’m reluctant just yet to name them but if they don’t come through I will go to town on them lol 😂
 
22 psi is an acceptable boost level for an N20 engine

Most people caution going above 23 for non turbo related reasons..

Most re-maps at the ‘sane’ end run about that..stock PSI boost is 17 psi so it’s not a big increase..

If it’s 22 psi above 14.7 psi reference then that’s an awful lot of boost and not sure the MHI turbo could do that anyway...

Could have been just an ailing turbo that was ‘accelerated’ to its demise..
 
Well you are where you are now with your car and time to get that turbo sorted for at least a third of the price of what BMW want 👍.If your car still had the map in place you could have took it and had it scrutinised by an independent expert to see if indeed the remap did cause the turbo to fail but that is obviously not an option now. Hopefully the remap company or franchise you used will assist you in putting things right. Let this be a lesson to us all that if you are going to map a car then one that includes a before and after dyno is a must and I initially was guilty of not taking this option but fortunately my first map by a man in a van remap was okay. Hope you get this sorted OP in your favour. The good tuners will spot any issues before they apply their maps.
 
Boltz said:
The good tuners will spot any issues before they apply their maps.
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Genuine questions here because I’m interested, what would have shown up as to a possible turbo failure before the map was installed? Would it have been down on power or have flagged something up on the computer. Also the fact that the issue never arose for 10 days after would it possibly have been detected earlier if dyno’d after the map?
 
Boltz said:
Let this be a lesson to us all that if you are going to map a car then one that includes a before and after dyno is a must and I initially was guilty of not taking this option but fortunately my first map by a man in a van remap was okay.
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I think the lesson to be learned here is that if you do remap your car, be prepared to pay for anything which goes wrong thereafter out of your own pocket.
 
Definitely many questions Argyll Andy, hopefully we get a well respected tuner reading this post who could possibly shed some light on what could have caused the turbo to overboost.
 
I’m curious as to how the turbo has actually failed. Has it bent a vane, broken a piece off, have the impeller shaft seals failed, did BMW give you the reason it failed...?

Doesn’t help at all but personally I don’t like these mobile tuning outfits, it’s a bolt on and run scenario. :(
 
Whining turbo typically means a worn and failing turbo bearing. They usually fail because not enough engine oil is getting to the bearing to cool and lubricate it, and the reason for that is usually that the turbo bearing oil feed and oil return pipes are blocked with carbon from switching the engine off when the turbo is too hot.

In terms of a remap, the turbo will obviously have to spin quicker to generate the extra boost but considering they run around 200,000rpm as std, I think it's fairly unlikely that 22psi would cause catastrophic overspeed. A lot will depend on the condition and quality of the oil though - a good fully synthetic is highly recommended for boosted engines.

You are where you are, but I'd defo be getting your turbo reconditioned rather than replaced along with a full oil service. It shouldn't really cost you more than £500 at a garage (£200 if you take it off and refit yourself) and forget all the litigation stuff. It's critical that the oil feed and return pipes are checked and cleaned before fitting a new turbo. I've seen new turbos destroyed so many times because of this.
 
ph001 said:
Whining turbo typically means a worn and failing turbo bearing. They usually fail because not enough engine oil is getting to the bearing to cool and lubricate it, and the reason for that is usually that the turbo bearing oil feed and oil return pipes are blocked with carbon from switching the engine off when the turbo is too hot.

In terms of a remap, the turbo will obviously have to spin quicker to generate the extra boost but considering they run around 200,000rpm as std, I think it's fairly unlikely that 22psi would cause catastrophic overspeed. A lot will depend on the condition and quality of the oil though - a good fully synthetic is highly recommended for boosted engines.

You are where you are, but I'd defo be getting your turbo reconditioned rather than replaced along with a full oil service. It shouldn't really cost you more than £500 at a garage (£200 if you take it off and refit yourself) and forget all the litigation stuff. It's critical that the oil feed and return pipes are checked and cleaned before fitting a new turbo. I've seen new turbos destroyed so many times because of this.
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I’d thrown that one out due to the very low mileage but you’re probably right. Does the 2.0 have the thermostatic water cooling that the 35i/s have after switch off...?
 
Pbondar said:
22 psi is an acceptable boost level for an N20 engine

Most people caution going above 23 for non turbo related reasons..

Most re-maps at the ‘sane’ end run about that..stock PSI boost is 17 psi so it’s not a big increase..

If it’s 22 psi above 14.7 psi reference then that’s an awful lot of boost and not sure the MHI turbo could do that anyway...

Could have been just an ailing turbo that was ‘accelerated’ to its demise..
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I think that measurement will be gauge. I can only speak for the N54 with certainty but the stock 35i runs at 8PSI above atmospheric and a conservative remap would be about 16PSI above atmospheric. I imagine the N20 runs higher boost levels to get those power figures so he was actually at 36PSI above atmospheric.

Takes a fair amount of abuse to kill a turbo at 10,000 miles though. Naming and shaming the tuner should be classed as a public service announcement.
 
I’m sure someone else has blown a N20 turbo but through my various research I never stumbled on anyone who had publicised it...

Given that a lot of the re-maps are copies of each other it would seem strange that one was ‘rogue’...

But as I found out the hard way for unexplained reasons my ‘quality supplier re-map’ performed by a ‘quality garage’ was duff...

So maybe it was finger trouble with the installer and he pressed a ‘wrong button’ somewhere..

The N20 has the run on coolant flow to help obviate oil cooking/ coking by shutting off a hot turbo without an idle time..not sure if someone could have inadvertently deleted that function when re-mapped..

10,000 miles seems premature for oil flow inspired bearing failure...many N20s have gone past 100k miles with no recorded turbo issues..

Those that comment strongly suggest 5k mile oil changes and using premium grade oils like the Redline product range rather than the mass marketed oils...
 
Boltz said:
Definitely many questions Argyll Andy, hopefully we get a well respected tuner reading this post who could possibly shed some light on what could have caused the turbo to overboost.
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Faulty wastegate possibly, all guesses without knowing all the information-the boost pressure alone shouldn’t have caused it.
Rob
 
Pbondar said:
I’m sure someone else has blown a N20 turbo but through my various research I never stumbled on anyone who had publicised it...

Given that a lot of the re-maps are copies of each other it would seem strange that one was ‘rogue’...

But as I found out the hard way for unexplained reasons my ‘quality supplier re-map’ performed by a ‘quality garage’ was duff...

So maybe it was finger trouble with the installer and he pressed a ‘wrong button’ somewhere..

The N20 has the run on coolant flow to help obviate oil cooking/ coking by shutting off a hot turbo without an idle time..not sure if someone could have inadvertently deleted that function when re-mapped..

10,000 miles seems premature for oil flow inspired bearing failure...many N20s have gone past 100k miles with no recorded turbo issues..

Those that comment strongly suggest 5k mile oil changes and using premium grade oils like the Redline product range rather than the mass marketed oils...
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So do you think it was the remap that caused it mate ?
10 days after I had it done and I only drove it 3 times in that time :headbang:
 
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