Boost and fuel question with xfi

434nova

Active Member
Sep 30, 2013
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28
I have a couple of questions for you xfi guys. Let’s say I’m tuned for 30 #s of boost and I end up spiking to 32 pounds will the xfi correct the fuel for the added boost or not?

Second scenario let’s say im tuned to run to 6000 rpm and somehow I end up turning to say 7000 rpm will the xfi adjust fuel and timing for this instance or not?

Thanks
 

HighPSI

Moderator
Staff member
May 24, 2001
5,380
311
83
Melbourne, FL
HartlinePerformance.com
If you're exceeding the MAP sensor limit, the computer won't "see" the extra boost. It will just run in the top rows of your Fuel, Timing, and Target A/F maps. This isn't terrible but, depending on how efficient your turbo is up there, you could get an increase in O2 correction. If you normally run a little above the Map Sensor limit, I would adjust the top rows in those tables to be correct for the higher boost. If you're running a lot higher, I would swap to a higher boost Map Sensor.

As for the rpm, the computer does see that and will run whatever Timing, Fuel, and Target A/F is in the highest rpm on the appropriate table.

Sent from my SM-N960U1 using Tapatalk
 

norbs

doing more with less
May 25, 2001
5,975
59
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canada
A bit off topic, but instead of increasing the boost and rpm can you increase the exhaust housing size instead?
 
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