k my turbo spools up nice but when i go wot around 3000rpm and 4500 rpm it will bog and backfire. but i can go to redline if i accelerate slowwwwwwly. just when i give gas it bogs and will backfire if i try to make it. check all the rubber boots for cuts and found none. i have had it boost nicely but only twice and try again hr later and it bogs again. why what is the problem. im getting nothing but bad luck lol someone brighten my day with a solution.

 

k so now my tank is almost empty and my turbo was spooling ful with no problems and felt good! so why when my tank is full is it bogging and on empty it boosts nice and hard?? im using 91. is it picky on where i get my fuel from? it was from a mac's gas station? anyone have any info or suggestions?

 

so you filled the tank back up and it started bogging again?? if thats the case it sounds like a tuning problem. possibly like your to rich??? this may not be relavent, but i had a two stroke engine that ran more lean at the end of the tank, it could be that yours is doing the same?? just a thought...

 

well i left the house again on empty tank and same thing back to bogging so it bogs full tank or empty tank and boosts only if im lucky once a week

 

check fuel lines for blockages?

 

^check lines, check fuel filter,
if u can try fill above 91ron ...

 

It is probably the stock ecu going crazy when you don't floor it and it is reading a lot of air going into the engine...

floor it and see if it keeps "bogging"

if is the stock ecu it won't back fire at WOT

 

what ecu are you using if any?

 

gravity fed fuel system?

 

wot throttle it bogs and if i go easy its ok. im using the rrm's piggy back the split second. but im gonna tune it cause i think thats the prob

 

the fuel filter is non servicable to my understanding but are you on a return system or just rrm kit?

 

Check spark plugs. They might be bad. My evo had the same problem you're describing when the plugs went bad. GL.

 

check the fuel return line or maybe even the vent hose for the fuel fill.....do u have a fuel pressure regulator or gauge to know what fuel pressure u are running?

 

check the fuel return line or maybe even the vent hose for the fuel fill.....do u have a fuel pressure regulator or gauge to know what fuel pressure u are running?

 

I'm having the same problem, slow boost to about 10PSI then spikes to 22, stutters, and backfires/small explosion feeling

Could this be cause of spark plugs?