[SnapCoupe]

I have searched around for this answer but unfortunately I cannot find the answer I am looking for. WITH supporting mods (Intake, charge pipe, cat-less DP, 7" intercooler) what is the peak boost that the stock turbo can handle? As in, not how much peak boost it can create, but at what PSI level does the peak boost put an overly excessive wear on the stock turbo?

Thanks!

[weehe126]

I ran 21-22psi tapering to 13psi for 50k miles+. Stock turbo is very reliable.

[xxMike61]

Originally Posted by weehe126

I ran 21-22psi tapering to 13psi for 50k miles+. Stock turbo is very reliable.

Are there any weakpoints aside from stock CP? I got a upgraded cp and fmic. but the fmic intercooler I have has the OEM style c clip mounts. Perhaps those are the week points for my particular setup? Also I still have the plastic "j' pipe between CP and fmic on driver side.

[SnapCoupe]

Originally Posted by weehe126

I ran 21-22psi tapering to 13psi for 50k miles+. Stock turbo is very reliable.

Thats good to hear. I am running just over 21 psi peak that tapers to 11.5 on 92 octane. This car is my daily and while a PS2 upgrade is in the future, I want to work on chassis/suspension mods before then. Just want to make sure the stock turbo wont go out on me anytime soon under that kind of peak boost.

[weehe126]

Originally Posted by SnapCoupe

Thats good to hear. I am running just over 21 psi peak that tapers to 11.5 on 92 octane. This car is my daily and while a PS2 upgrade is in the future, I want to work on chassis/suspension mods before then. Just want to make sure the stock turbo wont go out on me anytime soon under that kind of peak boost.

Wow, hope you are running meth or 0 timing. I had to do E40 to run 22psi.

[weehe126]

Originally Posted by xxMike61

Are there any weakpoints aside from stock CP? I got a upgraded cp and fmic. but the fmic intercooler I have has the OEM style c clip mounts. Perhaps those are the week points for my particular setup? Also I still have the plastic "j' pipe between CP and fmic on driver side.

Stock IC connections leak pressure, so basically a boost leak.

[Turbod]

I have only ever seen 23 psi but that is only for 500 - 1,000 rpms. Boost at redline is usually 11 - 13 psi.

[SnapCoupe]

Originally Posted by Turbod

I have only ever seen 23 psi but that is only for 500 - 1,000 rpms. Boost at redline is usually 11 - 13 psi.

21.8 psi for about 500 rpm, then drops quickly to 18, then continues to taper till redline.

[Turbod]

Originally Posted by SnapCoupe

21.8 psi for about 500 rpm, then drops quickly to 18, then continues to taper till redline.

Get a N20 TMAP sensor. I have seen 23 on more than one setup.

[SnapCoupe]

Originally Posted by Turbod

Get a N20 TMAP sensor. I have seen 23 on more than one setup.

Figured those were only used on aftermarket turbo setups. What will I achieve having one on my current setup?

[Turbod]

Originally Posted by SnapCoupe

Figured those were only used on aftermarket turbo setups. What will I achieve having one on my current setup?

Your sensor is limited to 21 psi so it cannot effectively see boost higher than 21psi. For people that truly want to max out the stock turbo you should get this sensor. Most people are fine targeting 20 psi.

[SnapCoupe]

Originally Posted by Turbod

Your sensor is limited to 21 psi so it cannot effectively see boost higher than 21psi. For people that truly want to max out the stock turbo you should get this sensor. Most people are fine targeting 20 psi.

Ah, I see. My target boost is around 18psi.

[Austin_2019_X5_50i]

Originally Posted by Turbod

Your sensor is limited to 21 psi so it cannot effectively see boost higher than 21psi. For people that truly want to max out the stock turbo you should get this sensor. Most people are fine targeting 20 psi.

I have a 2019 X5 50i that I believe they increased the boost from 15 to 20psi. Dyno said 545awhp so about 150 awhp gain. My question is can I turn up the boost more? To what level? Will I need anything i.e. special fuel or other mods? Lastly, could this tune just have increased my boost and charged me $3k??

Thanks a lot!

[weehe126]

Originally Posted by Austin_2019_X5_50i

I have a 2019 X5 50i that I believe they increased the boost from 15 to 20psi. Dyno said 545awhp so about 150 awhp gain. My question is can I turn up the boost more? To what level? Will I need anything i.e. special fuel or other mods? Lastly, could this tune just have increased my boost and charged me $3k??

Thanks a lot!

You realize you have a N63tu, not a N55. They came with the same MAP sensor, so you are also limited to 21psi on stock sensor.

[Kevin39]

Originally Posted by weehe126

Wow, hope you are running meth or 0 timing. I had to do E40 to run 22psi.

That's what I was thinking, 21psi on 92 octane doesn't sound right.

[Pladi]

Originally Posted by weehe126

Wow, hope you are running meth or 0 timing. I had to do E40 to run 22psi.

this is so true.

[The Silver Slammer]

Re-pinning stock map sensor type "A" harness.

https://www.e90post.com/forums/showthread.php?t=1368216

[philgli]

Are these high numbers targets or actual boost?

How in the world are you getting such high numbers?

I run MHD stage 2 and thought i would hit at least 14 but i target 14 and hit like 11

[Schmidty335i]

Originally Posted by philgli

Are these high numbers targets or actual boost?

How in the world are you getting such high numbers?

I run MHD stage 2 and thought i would hit at least 14 but i target 14 and hit like 11

I would think you must have a boost leak somwhere, if you cant even hit 14psi. do you have any logs? is your PWM maxed out when making 11psi?

[Pladi]

Originally Posted by philgli

Are these high numbers targets or actual boost?

How in the world are you getting such high numbers?

I run MHD stage 2 and thought i would hit at least 14 but i target 14 and hit like 11

Thats because the car looks at load targets not boost. You can be making the load target with less boost based on how much timing advance can be used.. based on temp and other factors.


People keep talking about boost.. old news guys

[Turbod]

Originally Posted by philgli

Are these high numbers targets or actual boost?

How in the world are you getting such high numbers?

I run MHD stage 2 and thought i would hit at least 14 but i target 14 and hit like 11

Originally Posted by Pladi

Thats because the car looks at load targets not boost. You can be making the load target with less boost based on how much timing advance can be used.. based on temp and other factors.


People keep talking about boost.. old news guys

Pladi is correct that the MHD OTS maps are load targets. I believe Wedge (Ken) is using commanded WGDC. The JB4 targets boost pressure.

[bbnks2]

Originally Posted by philgli

Are these high numbers targets or actual boost?

How in the world are you getting such high numbers?

I run MHD stage 2 and thought i would hit at least 14 but i target 14 and hit like 11

It completely depends on what rpm range you're talking about. For a while, I ran a map making 23psi+ but it was at 3200rpm and only lasted for about 500 rpm. I was peaking over 500wtq at 2700rpm. There was still more WGDC left to run the turbo even harder down low. There was an overboost revision that had me hitting 26-27psi even...

That doesn't mean much though when you can only do it for 500rpm lol.