Hi,i have evo 8 GSR 2005, few days ago I have instaled 3" turbo back exhaust, after that i felet more power in car, but some time at high rpms it was fuel cuting, then i instaled boost gouge and saw huge overboost at 2nd gear about 1.65-1.7...i think its to much...and then i saw CEL light and P0234 error...why it hapened?

there is two reasons:
1) new exhaust
2)rear O2 sensor,couse i instaled i t like there https://www.evolutionm.net/forums/sh...d.php?t=114931

is it boost to high? can i fix it with remaping or with westgate actuator?

thanks, i am waiting for response...

 

Yeah I'd get an MBC to cut the boost back some. Your new exhaust is creating less restriction. Hence why you're boosting almost 25 psi. That's not safe.

 

P0243: Turbocharger Wastegate Solenoid Circuit

i got the same exact code when i disconnected my stock boost solenoid.

check the connectors on the boost solenoid. hope that helps

 

This is why even with an MBC install, people leave the factory solenoid plugged in to the ECU. Yours might have shorted or something.

 

i agree, just get an MBC.... i still get that same code once in a while but thats because i removed mine.

 

all connection is all right...hm, that ideas?

 

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somebody says that i need setup actuator...

 

I don't understand. WGA?

 

adding a TBE does not change your boost

 

It can. We see it more with VIIIs than IXs.

https://www.evolutionm.net/forums/sh...ight=TBE+boost

Post #5. Warrtalon pretty much sums it up.

 

Uhh. Yes it does.

 

its very intresting, but some friends who have vw gti and A3 1.8T instaled turboback exhaust and then boost at 1.8t changed from 0.5 to 1.0 bar without any mods just with exhaust....and same in gti....but meybe its beter to make a good ECU map?

 

actuator reguliation did not help...can this problem be from rear O2 sensor?

 

No I don't think so. The rear O2 sensor is just a check to see if the cat is working. It won't affect anything with fuel trims, timing, etc. in the ECU. The front O2 sensor could though.

How difficult would it be for you to get an MBC and/or a tune?

 

Ive instaled cat and insert rear O2 in standart place...now overboost is about 1.5 and boost in low rpms is about 1.3 in high about 1.15 is it normal?