Hitting the Boost Cut, Help!!
Hitting the Boost Cut, Help!!
My 05 Evo with the Xede seems to hit the boost cut off when I lug it in high gear. According to my Defi gauge it is hitting 24-25 psi on 91 pump gas. The car has TBE and drop-in K&N. I attached the boost table from my Xede 91 octane map.
Could someone please tell me how much I need to back off the numbers on the boost table? Would -5% do it across the board?
Could someone please tell me how much I need to back off the numbers on the boost table? Would -5% do it across the board?
Originally Posted by Evo23IG
Do you have an XedeFlash? You can highlight everything after 4200 or 4700 and lower it few clicks and see how that helps.
Well thats explains one thing, is that you still have the factory boost cut settings. The reason I say start at 4700 and higlight everything after it till 8000 lower by few clicks, this way it lower the boost spike and your boost level by pound. Go out test and see how it goes.
you should start lowering and run a sustained max of 20-21 (21 being really the most) and a safe short duration spike to maybe 23-24. you should be holding 24 on pump gas 91.
if you stay below 21psi you should be fine even with stock boost cut from what i heard shiv say.
if you stay below 21psi you should be fine even with stock boost cut from what i heard shiv say.
Originally Posted by Evo23IG
Well thats explains one thing, is that you still have the factory boost cut settings. The reason I say start at 4700 and higlight everything after it till 8000 lower by few clicks, this way it lower the boost spike and your boost level by pound. Go out test and see how it goes.
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Per the recommendation of Alfred at Tuning Tech, I reduced the the boost by 3% from 3500 rpm to 5500 rpm. I took the car for a test drive and it improved in that area, but I did not like the high boost at 3-3.5K. So I reduced the boost by 2% in that small power band. I did not go with 3% in this small band since it looked like a "valley" sandwidched between the 2500 rpm and the 3000 rpm peaks. That seems to have done the trick. The car now boosts to 22-23 psi at most and there was no boost cut in my short drive. I will test some more to make sure that I got it write.
This was my first time ever modifiying the maps and uploading and burning them into the Xede. BTW, XMap is so easy to use "even a cave man could do it." :-)
This was my first time ever modifiying the maps and uploading and burning them into the Xede. BTW, XMap is so easy to use "even a cave man could do it." :-)
