around 21 to 25 psi of boost. car will surge back and forth from 21 to 25.does any have any ideas why it would do this...while spiking about26 while driving

 

You need to explain it better. What does "surge back and forth" mean? Is it sputtering? Is it cutting out?

If you're running 26psi, I assume you are on alky/meth or race gas daily.

 

What mods do you have? How are you controlling boost?

 

feels like its cutting out...the only way to explain it is sugring.3inch exshuat,intake,blow off vavle,avcr controller.i only crank it up when racing on pump gas.no race gas or alkey

 

Lol You're SMART!

 

lol,proably about to blow up go get some race gas....

 

turn the boost down.

 

if you smart asses have nothing eles to say but make smart *** comments. then shut the hell up.its normal setting is about 18psi.the reason u make these comment because u have no idea

 

how are we supposed to know unless you tell us. 18psi on a evo 9 is actually less than stock boost levels. how does your car run when at 20-21 psi? what octane gas do you run? are you tuned?

 

no im not tuned stock fuel pressure. pump gas 93 or 94 depending on what station i go to.i thought stock boost was 18 psi.runs good at 20 21psi.look i dont know what else to say its new to me.

 

nope def spiking 21 and tappering down to may 16 or 17psi. DEF turn boost down. maybe boost cut?

 

do you mean,,, that when you step on it wot,,,, for example you spike 25 psi and then it levels back down to lets say 20-21,,, if this the case that normal ... oh and by the way that high boost you will only see in 4th and 5th because engine higher loads,,,, on the lower gears 1,2,3 you will se more like a 14-15-16 psi

on the other hand.... if you mean that when you go WOT youre boosts is all over the place ,,,,, like sporatic,,,, in other words not holding a consistent number,,, thats not good,,,,,
now do you feel any loss in power while this happens,,, if not check youre boost gauge.