Boost leak? fuel cut? compressor surge?

Does it cut out completely or does stumble? When i say stumble i mean like bog up and down?

 

check your bov for vaccum leaks all your pipes for any holes. Is your fuel pump stock are your injectors bigger and do you have an AEM wideband gauge to check if you are way too rich and then that could be why your hitting fuel cut, and as you already know that is very harmfull to your engine.

 

No, the MAF determines that.

In what gear(s)?

Sounds like fuel cut. Since you have mods that increase airflow, it's likely because of the mods, but still test for boost leaks.

No, that's not the correct term. The MAF is fine. It's the computer that determines when to hit fuel cut. The MAF can measure a hell of a lot more than stock airflow, so it's not being overrun.

 

It's fuel cut, the maf is being over runed. What you need is dsmlink or some way to trick the ecu in to thinking there is less air coming in the intake like a safc. You would need to tune your car with eather one an it would be wise to get a wide band o2 setup. Are you still on stock injectors?

 

believe me when i say that what i'm about to say is not being said in a **** kind of way:

First, it's 93.7% fuel cut that you're experiencing when you hit that brick wall at high boost. this is simply self-explanatory but if you're still like " uhhh, ?! ", you're MAF is telling you to " cut the ####ing boost down before i detonate on your ass ". i'm not sure how this kid was was spraying nitrous at 16+ lbs. and not blowing shit everywhere but touche to him.

i'm no dsm genius at all but if you want an opinion/advice, i think you should rip it apart and sorta start fresh. i'm not saying take the motor completely out & build it; but take all the things out that this dude put in because in reality, you have no idea what the hell this guy's done to this car & if not taken seriously, it could backfire in your face mate.

btw, turn your boost down to fix that problem & keep it down ( like below 12lbs ). it'll fix the " brick wall " feeling but may not fix any other problems you might be having.

 

The MAF isn't saying anything about boost. It reads airflow. You could throw on a large turbo, run stock boost, and definitely hit fuel cut. People can even start hitting fuel cut by just putting on a 16g, exhaust, and intake without ever modifying boost pressure. You could have a boost leak and the MAF will still read the air despite it not getting to the engine and hit fuel cut that way. The air could be cold enough outside to go over the fuel cut tipping point but be fine when it's warm outside. It's protection against going lean, not against detonation, which has to do more with timing. Why should he tear the entire engine down and build it?

 

i didn't tell him to tear the entire engine down and build it ....

i said, " i'm NOT saying take the motor completely out & build it ".


and are you telling me you CANNOT detonate from leaning out ?

 

I didn't say that. Running lean more melts things than creates detonations.

No. The ECU is blind to that.

 

amen.

but personally, i think it be better & easier to get some free time and connect the dots on everything the previous owner put on the car. and take the bottle off.

 

Sounds like your ECU has a bad/damaged ground wire. It's how the maf reads airflow. I was experiencing very similar issues, I bet its your ecu. Send it out to be checked.

 

No shit, Sherlock. All you said was "upgrade the fuel system," which could mean something as simple as rewiring the pump. The ECU is blind to what's going on in the fuel system. It just happily pulses the injectors while receiving no input back from the fuel system. I don't get why you posted hexadecimal. You obviously didn't understand the point I was trying to make about the ECU being blind to fuel system upgrades.

 

i wanna meet the person who rewires their fuel pump to upgrade the fuel system ...

 

By that logic you should be able to just throw in whatever injectors you want and the ECU should be able to compensate just fine in closed loop. The ECU is blind to anything done to the fuel system. The behavior you describe is meant to make small adjustments because conditions are varaible, not to correct stupidity. He's hitting fuel cut because he has a larger turbo, an exhaust and intake, and maybe cams. He should get something like DSMLink and just go with bigger injectors...but still test for boost leaks first.