Max boost pressure on stock turbo

Bmwuk · 07-14-2017, 10:18 AM

Hi All

Just in process of doing some custom remapping plus installing water meth and wondered what a stock recon turbo from a 3.0d m57n2 engine can safely handle in terms of boost pressure in either bar/p.s.i. I believe they range from 1.2-1.5bar / 17-22 p.s.i but correct me if im wrong?

Thanks

WreckerX5d · 07-14-2017, 12:07 PM

Stock PSI is 26, and increased I believe is around 35 to 38 or so.

Bmwuk · 07-14-2017, 01:52 PM

Thanks for info... wow that a lot more than i expected... anybody remapped to that level on here? Figures in bhp?

Hoooper · 07-14-2017, 03:54 PM

Check out the threads on BPC and JRTuning. Both of them have "maxed out" stock turbo tunes.

Miko226 · 07-14-2017, 05:07 PM

Quote:

Originally Posted by Bmwuk

Thanks for info... wow that a lot more than i expected... anybody remapped to that level on here? Figures in bhp?

Tons of threads on here but like he said stock is around 26psi and depending on the tune / mods it varies

Torqu3 · 07-15-2017, 01:33 PM

JR 2.8 is "maxed out" for stock turbos, and I was pushing right at 37psi at the drag strip last night.

Mrdeezy · 07-15-2017, 07:58 PM

Gosh mine hits 40 sometimes with jr 2.8 ��

335dsleeper · 07-15-2017, 08:12 PM

With my EWG, I could make 42-44psi on stock turbos. The problem is the stock turbos are way out of their efficiency range and excessive EMPs. Emps were well above the max recorded value of 58.xx psi. I believe 37-38psi has been proven optimum with the stock turbos.

Goboro100 · 08-27-2019, 09:16 AM

38psi the car will make plenty of power. And 45psi or more can blow end tanks off the stock intercooler.... spike 40 hold 38psi is perfect ��

ranthum · 08-28-2019, 12:34 PM

In my opinion about 35 psi at the intake manifold is optimal for stock turbos. More boost means more heat which means less dense air. Also, to get 35 psi at the intake, pre intercooler boost will be higher.

robnitro · 08-28-2019, 02:46 PM

Yes and to make more boost the exhaust pressure will be higher, limited by the flow of the stock wheels.
There's also a point where too much emp can cause exhaust valves to stay open (acting like egr, forcing exhaust gasses back into cylinders)

07-14-2017, 10:18 AM	#1
Bmwuk BMW GTS 52 Rep 202 Posts Drives: BMW M90 GTS Join Date: Mar 2016 Location: UK iTrader: (0)	Max boost pressure on stock turbo Hi All Just in process of doing some custom remapping plus installing water meth and wondered what a stock recon turbo from a 3.0d m57n2 engine can safely handle in terms of boost pressure in either bar/p.s.i. I believe they range from 1.2-1.5bar / 17-22 p.s.i but correct me if im wrong? Thanks __________________ BMW M90 GTS STAGE 3 -- HYBRID TURBO -- WAGNER FMIC -- PROGRESSIVE METH KIT -- 6HP28 w/uprated TC -- DPF / EGR DELETE -- CUSTOM CAT BACK STAINLESS TWIN EXIT EXHAUST WITH REMUS M3 CF TIPS -- M135i FRONT 4 POTS -- 19" BBS CSLs -- RAPTOR XENON HEADLIGHTS -- CIC iDRIVE -- COMBOX -- LEMON DAKOTA INTERIOR --
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07-14-2017, 12:07 PM	#2
WreckerX5d Warrant Officer 375 Rep 1,341 Posts Drives: Deezul Join Date: Oct 2010 Location: Long Island, NY iTrader: (4)	Stock PSI is 26, and increased I believe is around 35 to 38 or so. __________________ Deleted, ATM I/C and tuned by B.R.R.
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07-14-2017, 01:52 PM	#3
Bmwuk BMW GTS 52 Rep 202 Posts Drives: BMW M90 GTS Join Date: Mar 2016 Location: UK iTrader: (0)	Thanks for info... wow that a lot more than i expected... anybody remapped to that level on here? Figures in bhp?
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07-14-2017, 03:54 PM	#4
Hoooper Colonel 213 Rep 2,210 Posts Drives: 335D Join Date: Jun 2013 Location: Petaluma, CA iTrader: (0)	Check out the threads on BPC and JRTuning. Both of them have "maxed out" stock turbo tunes.
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07-15-2017, 01:33 PM	#6
Torqu3 Major 321 Rep 1,157 Posts Drives: 2011 335d Join Date: Sep 2016 Location: Centralish Texas iTrader: (0)	JR 2.8 is "maxed out" for stock turbos, and I was pushing right at 37psi at the drag strip last night.
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07-15-2017, 07:58 PM	#7
Mrdeezy Second Lieutenant 55 Rep 218 Posts Drives: 335d m-sport Join Date: Aug 2015 Location: San diego iTrader: (0)	Gosh mine hits 40 sometimes with jr 2.8 ��
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07-15-2017, 08:12 PM	#8
335dsleeper Banned 389 Rep 1,623 Posts Drives: 09' 335d 10'35D Join Date: Dec 2015 Location: Suffolk, va iTrader: (0)	With my EWG, I could make 42-44psi on stock turbos. The problem is the stock turbos are way out of their efficiency range and excessive EMPs. Emps were well above the max recorded value of 58.xx psi. I believe 37-38psi has been proven optimum with the stock turbos. Last edited by 335dsleeper; 07-15-2017 at 09:06 PM..
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08-27-2019, 09:16 AM	#9
Goboro100 Private 11 Rep 73 Posts Drives: 335d Join Date: Mar 2019 Location: Upstate NY iTrader: (0)	38psi the car will make plenty of power. And 45psi or more can blow end tanks off the stock intercooler.... spike 40 hold 38psi is perfect ��
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08-28-2019, 12:34 PM	#10
ranthum Private First Class 23 Rep 133 Posts Drives: Looking to Buy Join Date: Jan 2015 Location: United States iTrader: (0)	In my opinion about 35 psi at the intake manifold is optimal for stock turbos. More boost means more heat which means less dense air. Also, to get 35 psi at the intake, pre intercooler boost will be higher.
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08-28-2019, 02:46 PM	#11
robnitro Captain 160 Rep 803 Posts Drives: x5 35d e70 2011 Join Date: Sep 2016 Location: NYC area iTrader: (0)	Yes and to make more boost the exhaust pressure will be higher, limited by the flow of the stock wheels. There's also a point where too much emp can cause exhaust valves to stay open (acting like egr, forcing exhaust gasses back into cylinders)
	Appreciate 0 Quote