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Evo X Performance General discussion for performance topics that are unique to the Evo X. IF THE TOPIC IS COMMON WITH OTHER LANCERS, PLEASE POST IT IN: '08+ Lancer Common.
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Old 07-14-2019, 04:32 AM   #1
Strider327
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Inconsistent Boost

Hello EVO X Community:


I am trying to chase down an issue currently. My issue is that when I am doing datalogs my boost is all over the place. For example, 3rd from 2500 to 7500rpm roughly.


2500RPM - 1.5psi
3500RPM - 30.4psi
4500RPM - 26psi
5500RPM - 26psi
6500RPM - 21psi
7500RPM - 16psi


As far as I know, there are no boost leaks. Boost leak test was done and all the way up to 30psi. 3 port boost solenoid "seems" to be holding/working fine. FBO, stock turbo, vta bov.



15 MR



If anyone has any ideas, please share your experience.


Thanks in advance
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Old 07-14-2019, 05:20 AM   #2
Ralliartist
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Based on what you posted, that looks like a fairly typical boost curve for a stock turbo. Stock turbos usually peak around 3500 and then taper off to around 20 psi at 7K. Boost will continue to drop as you go higher in the RPMs. The stock turbo just isn't big enough to push a lot of boost up top.
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Old 07-14-2019, 05:34 AM   #3
Strider327
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Quote:
Originally Posted by Ralliartist View Post
Based on what you posted, that looks like a fairly typical boost curve for a stock turbo. Stock turbos usually peak around 3500 and then taper off to around 20 psi at 7K. Boost will continue to drop as you go higher in the RPMs. The stock turbo just isn't big enough to push a lot of boost up top.

So what I am seeing is normal for a stock turbo.
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Old 07-15-2019, 11:47 PM   #4
Metal_AF
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Quote:
Originally Posted by Strider327 View Post
So what I am seeing is normal for a stock turbo.
Yup. feel free to post up a chart to look for sudden drastic drops, but the numbers you provided are totally normal for stock turbo.
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Old 07-16-2019, 09:16 PM   #5
turismolover22
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Quote:
Originally Posted by Strider327 View Post
5500RPM - 26psi
6500RPM - 21psi
7500RPM - 16psi
This is why its about pointless to run a stock turbo past 6500. You aren't making any power, and you're just pushing yourself outside the torque curve on the upshift, slowing you down.
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