low boost problem

[CIVICUK]

hello, recently scaled in my factory MAF to achieve better stft and managed to get it closer to zero while also maintaining a solid .49 knock control even at WOT red line. but looking at my boost table i am trying to target 17.5 psi at 3000rpm at WOT but for some reason i was only reaching 13.9 psi. any ideas why? when i was scaling the maf the calculations of the averages were all in the - and im yet to finish 3.2v upwards as my first log didnt give me any data to go by. could this be the reason why im not hitting full boost? ive attached a photo.

cheers!

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[KTuner]

Did you adjust turbo ramp?

 

[CIVICUK]

Did you adjust turbo ramp?

i have re created the boost table curve so i peak at 21psi at 5000rpm but all adjustments are on stock ramp / spool/ etc.

 

[KTuner]

Using the factory ramp setting would explain why you're starting the ramp at a lower boost level.

 

[CIVICUK]

Using the factory ramp setting would explain why you're starting the ramp at a lower boost level.

Thznk you ktuner i changed to aggresive and that sorted the boost problem. This is a bit off topic but when i was scaling my MAF i could not get any data for after 4.2v. Is this because my system runs in closed loop when im in WOT? If this is the case do i then have to reduce these MAF targets on the difference between my AFR vs AFR cmd ?

 

[CAPTS]

stock turbo maxed out pretty much so it won't go more than that but if you upgrade your turbo then you may wanna upgrade the MAF sensor too when time comes.

 

[kytos]

but if you upgrade your turbo then you may wanna upgrade the MAF sensor

I think you mean MAF housing to the PRL race, not the sensor itself.

 

[KTuner]

Thznk you ktuner i changed to aggresive and that sorted the boost problem. This is a bit off topic but when i was scaling my MAF i could not get any data for after 4.2v. Is this because my system runs in closed loop when im in WOT? If this is the case do i then have to reduce these MAF targets on the difference between my AFR vs AFR cmd ?

If you didn't pass 4.2v you won't see any data for it.

 

[CAPTS]

I think you mean MAF housing to the PRL race, not the sensor itself.

the sensor & prolly the housing too when a larger turbo installed.

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