Feels like a brick wall..

[t56speed]

OK guys I really need to get a logger bc something is up with the car. I boost leak tested the car today and found none!! Now that i put the silencer in the muffler an killed the boost creep problem the car really feels like a turd under boost and runs a 10.0 afr at wot at any rpm. I mean it feels like as soon as I go wide open it just goes into saftey mode. I mean seriously I can make the car accelerate faster with boost creep an partial throttle boost at like 10psi. wtf. Idk what the deal is bc cruising the car does great and gets good mileage but as soon as I hit boost it goes omega rich and just black smokes like a diesel ....
Would appreciate any help. Btw even put the mbc back on it and tried to up the boost a lil to help lean it out and it still just runs like crap... Makes me wonder if the knock sensor is going bad or something..... Idk what to do... Im gonna pull the silencer back out tomm so the turbo can breathe again...

 

[Cdc1221]

Try turning your fuel pressure down a couple psi

 

[4g63t]

What condition are your 02 sensors in? When you put your wb in what did you do with the one that was there? Or did you weld a bung on and put it in that one?
How do you know the engine is knocking?

 

[genegoesfast]

You throwing any codes?

 

[Marceldsm]

are you on stock injectors ???


verify fuel pressure

check fuel pressure regulator


is there any codes ( o2 signal, tps ect )

 

[snowborder714]

Using the MBC to try and control AFR's is not a good idea.

How much boost are you running?
Where is your AEM wideband placed in the exhaust?
Have you checked for exhaust leaks before it (i.e. if it's placed after the flex section, that might be leaking)?
Do you have a 1g CAS? If so, does your car happen to go into limp mode at any point? This is common with a 1g CAS in a 2g car.

 

[jpmxrider489]

Using the MBC to try and control AFR's is not a good idea.

How much boost are you running?
Where is your AEM wideband placed in the exhaust?
Have you checked for exhaust leaks before it (i.e. if it's placed after the flex section, that might be leaking)?
Do you have a 1g CAS? If so, does your car happen to go into limp mode at any point? This is common with a 1g CAS in a 2g car.

These are great points.

If you have no logger, you should have 2 factory o2 sensors plus your wideband? If the wideband is one of your 2 factory ones, I dont think theres a way to simulate it.

 

[4g63t]

The rear o2 shouldn't cause your issues but will throw a code. It just monitors the catalyst efficiency. We need some info from the op to help.

 

[t56speed]

ok guys both o2s are in good condition. Fuel pressure is at 43psi. I put the wideband at the bottom of the downpipe right after the bend. I had it running at 13psi. Im not dumb enough to turn it way up. I just wanted to see. An Im new to dsms so what is the CAS and where is it located. It is a six bolt swap so what should i be looking for?????? Its not throwing any codes. It doesnt seem like its knocking. Just goes super rich under wot and runs like extreme dog crap. It didnt start doing this till I put the silencer in... Had the car at the exhaust shop yesterday and we checked for exhaust leaks from the turbo back and found none..

never mind found the CAS idk if its a 1g or 2g though. hmmm... wonder if its working. How do you test one?

 

[Cody Nelson]

CAS wont cause any of your symptoms? and its most likely a 1g sensor if it is a six bolt swap. the car will most likely not start if the sensor has failed due to no relation of cams on engine cycle. it tells the ecu when to fire and if it doesn't get any signal back it wont start.

 

[t56speed]

OK forgot to answer yes the car is on the stock Injectors the real ? is are they the 450cc injectors or the 390cc injectors. I pulled the silencer back out. Boost creep is back and so is fuel cut but when boosting the car seems alot better until well it creeps up to 20psi and hits fuel cut. Blah... Im in between a rock and a hard spot I really need dsm link and dont have the money...

 

[snowborder714]

Manual 1g = 450cc
Auto 1g = 390cc

Boost creep is common with a ported 16g and the size exhaust you currently have. You should research this and figure out what others have done to cure/get rid of the boost creep.

 

[t56speed]

Yeah I finally got a hold of the prev owner an it does have the 450s. And Ive been researching everywhere. Only thing I can think of is to put a t25 back on there or something of that nature. I know for a fact adding back presure will get rid of the boost creep I just dont get why it runs like dog crap when i add the back pressure back to it.