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Turbosmart Blow Off #1657459
06/05/2022 21:55
06/05/2022 21:55
Joined: Jun 2021
Posts: 7
Hochheim am Main, Deutschland
B
branimir20VT Offline OP
Newbie
branimir20VT  Offline OP
Newbie
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Joined: Jun 2021
Posts: 7
Hochheim am Main, Deutschland
I bought a new blow off valve, Turbosmart BOV Race Port GenV(50mm). My car is stock (power) with stock turbo. Somebody said me that this BOV is not good for my turbo. He says that it won't make some noise on standard Turbo. It doesn't make sense to use it when I have MAF sensor. What I have to do? I paid almost 300€ for that BOV.

Re: Turbosmart Blow Off [Re: branimir20VT] #1657464
06/05/2022 23:34
06/05/2022 23:34
Joined: Feb 2006
Posts: 5,313
Essex
Trappy Offline
Club Member 1834
Trappy  Offline
Club Member 1834
Forum is my life

Joined: Feb 2006
Posts: 5,313
Essex
Stop talking to that person and just fit it thumb


F****** b****** thing...
Re: Turbosmart Blow Off [Re: branimir20VT] #1657471
07/05/2022 09:37
07/05/2022 09:37
Joined: Feb 2019
Posts: 198
Free State of Jones
clanger Offline
On a journey
clanger  Offline
On a journey

Joined: Feb 2019
Posts: 198
Free State of Jones
The Bosch 2.10.4 ECU performs the majority of its fueling management based on metered air flow data from the MAF. The standard re-circ valve feeds excess air back into the intake system after the MAF - this excess air has been accounted for by the ECU via the MAF and fueling adjustments have been made accordingly.

If you fit an atmo blow off valve you waste this air out of the intake system after the ECU has made a fueling adjustment to cater for its presence. This can result in an incorrect fuel mixture.

If you examine the fuel trims using something like Multi ECU Scan you will see that they go out of spec and likewise the lambda integrator can become erratic. It not a disaster, it simply means that the engine is not working at its most efficient. The choice is yours.


E85
Re: Turbosmart Blow Off [Re: clanger] #1657473
07/05/2022 19:34
07/05/2022 19:34
Joined: Jun 2021
Posts: 7
Hochheim am Main, Deutschland
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branimir20VT Offline OP
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branimir20VT  Offline OP
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Joined: Jun 2021
Posts: 7
Hochheim am Main, Deutschland
thx,mate for answer! He told me the same thing you did. Do i need a blow off valve at all? Which one should I buy then for standard turbo?

Re: Turbosmart Blow Off [Re: branimir20VT] #1657474
07/05/2022 20:44
07/05/2022 20:44
Joined: Mar 2019
Posts: 204
North Macedonia
386ka Offline
Club Member 1814
386ka  Offline
Club Member 1814
Making a profit

Joined: Mar 2019
Posts: 204
North Macedonia
Of course you need one, because the turbo boost will surge when you close the throttle after accelerating. That air needs to be exhausted somewhere outside the intake pipe leading to the throttle body.

I have fitted a VAG recirc valve on mine (something for Audi/VW 1.8t are really cheap and accessible), and I think it works okay.

Re: Turbosmart Blow Off [Re: branimir20VT] #1657487
09/05/2022 12:19
09/05/2022 12:19
Joined: Jun 2021
Posts: 7
Hochheim am Main, Deutschland
B
branimir20VT Offline OP
Newbie
branimir20VT  Offline OP
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Joined: Jun 2021
Posts: 7
Hochheim am Main, Deutschland
I found one on the eBay. Lot of people had suggest me this one called Forge FMDV008. I think that this one is better option for stock car. I will save my Turbosmart and use it when I upgrade my engine.

Re: Turbosmart Blow Off [Re: branimir20VT] #1657507
11/05/2022 12:40
11/05/2022 12:40
Joined: May 2018
Posts: 593
born in Italy I live in German...
carmine Offline
club member 1915
carmine  Offline
club member 1915
Enjoying the ride

Joined: May 2018
Posts: 593
born in Italy I live in German...
hi, sorry if I intrude, the question also interests me, having a valve that can discharge the air, both outside and inside the intake pipe. the question is: with gtech2 + straight intake pipe + external filter + front intercooler + manual boost valve. but with original turbo, can the air be released into the atmosphere? or do you have to map live for this?

Re: Turbosmart Blow Off [Re: branimir20VT] #1657508
11/05/2022 13:15
11/05/2022 13:15
Joined: Feb 2019
Posts: 198
Free State of Jones
clanger Offline
On a journey
clanger  Offline
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Joined: Feb 2019
Posts: 198
Free State of Jones
There is no escaping the fact that Bosch Motronic 2.10.4 uses the MAF the way it does.


E85
Re: Turbosmart Blow Off [Re: branimir20VT] #1657509
11/05/2022 13:58
11/05/2022 13:58
Joined: Sep 2006
Posts: 16,088
FCSS 01684 593187
Countrycruising Offline
Club Rep Europe, member 914
Countrycruising  Offline
Club Rep Europe, member 914
Forum veteran

Joined: Sep 2006
Posts: 16,088
FCSS 01684 593187
Above 3k rpm the lambda controls the fuelling not the MAF, fitting that BOV won't make any difference as it's still vacuum controlled on overrun via the plenum, we fit all kinds of different makes without any issues, you'll just need to know what spring rating is correct.

Re: Turbosmart Blow Off [Re: branimir20VT] #1657510
11/05/2022 14:58
11/05/2022 14:58
Joined: Feb 2019
Posts: 198
Free State of Jones
clanger Offline
On a journey
clanger  Offline
On a journey

Joined: Feb 2019
Posts: 198
Free State of Jones
Lambda controls the fueling below 3k rpm too and drops out based on engine speed and load, its range can be altered via a map. However that is besides the point Likewise the spring rate on an atmo BOV, that relates to boost levels and is nothing to do with the ECU measuring airflow !!???

The MAF is used by the ECU across the board and many calculations are made based on its signal. When the ECU ignores lambda under heavy boost, MAF values are still taken into account. See Big Maf conversion for very highly tunes engines.

As I said in my original response, its not a disaster using an atmo BOV, the engine will just not be running at its most efficient - its really easy to see on the fuel trims.


E85
Re: Turbosmart Blow Off [Re: branimir20VT] #1657511
11/05/2022 16:48
11/05/2022 16:48
Joined: Sep 2006
Posts: 16,088
FCSS 01684 593187
Countrycruising Offline
Club Rep Europe, member 914
Countrycruising  Offline
Club Rep Europe, member 914
Forum veteran

Joined: Sep 2006
Posts: 16,088
FCSS 01684 593187
Yes ok..................

Re: Turbosmart Blow Off [Re: branimir20VT] #1657515
11/05/2022 21:15
11/05/2022 21:15
Joined: May 2018
Posts: 593
born in Italy I live in German...
carmine Offline
club member 1915
carmine  Offline
club member 1915
Enjoying the ride

Joined: May 2018
Posts: 593
born in Italy I live in German...
hi, Clanger I'd like to understand what you mean by "its really easy to see on the fuel trims". can you explain it to me better? It's very interesting. what to do with badly burning gasoline and carbon buildup on the valves? thank you


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