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 2011 R56 S Boost Pressure

 Created by: DuncaChunk
Orig. Posting Date User Name Edit Date
Jul 20, 2022 08:26AM DuncaChunk  
Jul 11, 2022 06:41AM kenatminimania Edited: Jul 12, 2022 03:17AM 
Jul 7, 2022 01:41PM DuncaChunk  
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 Posted: Jul 20, 2022 08:26AM
Total posts: 15
Last post: Jul 20, 2022
Member since:May 2, 2020
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Hey thanks for all the info, I'll give JMTurbos a shout

 Posted: Jul 11, 2022 06:41AM
 Edited:  Jul 12, 2022 03:17AM
Total posts: 2205
Last post: Aug 15, 2022
Member since:Dec 29, 2004
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From our turbo supplier:

The stock motor can handle 20 to 24psi however over 23psi the in coming air is to hot and causes pre-ignition and can cause engine failure.  If you are going to make 23 to 24psi you will need to spray meth and you have to have a full 3" exhaust.

1. Does 18psi sound correct? no. or am I going to blow up my engine again? yes absolutely if you don't resolve the problems. What kind of boost are people running on their R56 S's? we have not found the limit when the setup is correct but tactically it is 20 to 23 without meth and 23 to 24 with meth.

2. How does one actually dial back the boost? you adjust the wastegate as you stated below.  https://jmtcperformance.com/tech-info-and-help/turbocharger-tuning-and-setup/ however if you adjusted the wastegate and the boost didn't change then you likely didn't see or read the instructions that show you how to install the turbo.  The wastegate can interfere with the waterline and it will cause over boost. I've tried loosening the two lock nuts around the waste gate actuator and dialing that way back, but nothing seems to have changed.  Is this something that is gonna have be mapped on a Dyno? No it is not related to tuning - the factory tuning should keep it around 10 to 11psi with the GTD.

3. If the car needs to be tuned on a dyno, does anyone know of a good place to go in the Philadelphia area? No, you don't really need dyno tuning you can get the ECU tuning from us (or here) but the install and setup has to be correct or you will continue to have issues like this.  Please re-read the requirements for the GT and the installation guides and contact us if you have any questions.  Ph: 480-559-5401 Email


 Posted: Jul 7, 2022 01:41PM
Total posts: 15
Last post: Jul 20, 2022
Member since:May 2, 2020
Cars in Garage: 0
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Hey all.  Complete n00b to boost.  I have a 2011 Mini Cooper S.  Over the years, I've put some easy plug and play mods on the car, (Intercooler, stiff rear sway bar, piggy back chip, etc.)  After a while, I REALLY wanted to go fast, and so I swapped the stock turbo for a
K04 GT Dominator.  I didn't really see anything in that article that warned that this thing would make too much boost out of the box. 

Well lesson learned. 
I think within 100 miles the number 1 cylinder absolutely disintegrated and blew out 2 holes on either end of the crank case.

1 short block and almost a year later, I put a new engine in the car, same turbo and all.  This time around, I would like to make it so that this turbo does not completely blow up my engine hahaha.  I've installed a boost gauge, and did a couple runs in 3rd gear and saw that at ~5000rpm, the car is making about 25psi of boost with no signs of it being limited whatsoever.  From what I've read, some stock JCW could handle about 21psi or 22psi of boost.  The consensus around various online forums seems to be that stock Cooper S's can handle 18psi safely.

So 3 questions:

1. Does 18psi sound correct? or am I going to blow up my engine again? What kind of boost are people running on their R56 S's? 

2. How does one actually dial back the boost? I've tried loosening the two lock nuts around the waste gate actuator and dialing that way back, but nothing seems to have changed.  Is this something that is gonna have be mapped on a Dyno?

3. If the car needs to be tuned on a dyno, does anyone know of a good place to go in the Philadelphia area?

Thanks in advance for any and all advice.