strange stutter at low rpm w/ crazy boost

[coop795]

I am not new to the dsm world ( this is my second with the first topping out at 480whp out of a Galant VR4). So please no stupib newbie comments.

I am now building a 90 tsi with a completely fresh motor that i have about 3k on. Last week I started having a strange problem with how the car runs. I let the clutch out and get to about 1800 and I get a bad hesitation, the boost gage goes to max(stock). It kicks and bucks then when the real boost comes it take off like a raped ape. Once I get into real boost it seems ok. I do not have a logger on this car as of yet and I check the caps on the ecm and they are new. I did a tune up on it about 1k ago.
Thanks for taking the time to read this and look forward to some possible solutions.

 

[Achelea]

Top three responses will be
Have you done a Boost Leak Test?
Checked the hoses for cracks?
is your BISS adjusted correctly?

Another thing is, did you use NGK plugs? Some have noticed that their cars go to crap when using a different plug.

 

[coop795]

ngk plugs, just pulled one and smell like gas. got a suggestion for plugs?

 

[RayBan GST]

check your injectors and again do a boost leak test.

check your plugs and wires and again your injectros .

good luck

 

[RayBan GST]

I am not new to the dsm world ( this is my second with the first topping out at 480whp out of a Galant VR4). So please no stupib newbie comments.


are you kidding us you dont know what plugs to put to your car ???????? search for half minute here and you will get all the answers. what happen to that 480 whp dsm
good luck

 

[coop795]

its been three years and a diesel build in the middle, no plugs. gvmabrk

 

[coop795]

bump

 

[brassc2007]

do not bump your own thread

 

[brassc2007]

and think about it if your boost gauge is spiking the boost is getting trapped causing it to studder, then when you hit high boost it may have the pressure to go somewhere, what kind of blow off valve are you running.

 

[coop795]

stock BOV and turbo, I checked the IC piping and it is connected. THanks for the help

 

[brassc2007]

have you checked the waste gate at all, do you have upgraded injectors, what are you tuning with there are alot of things here

 

[coop795]

upgraded injectors, I am going to pull the turbo on thursday.

 

[knochgoon24]

Step 1:
Get a real boost gauge

Step 2:
Boost leak test

Your stock gauge is just a measure of what the ECU thinks it's seeing. High airflow measured by the MAS, like one caused by a boost leak, makes the ecu think you're flowing a low of air when you really aren't. This causes you to run rich. That's why your injectors smell like gas.

 

[DeadsEvolution1]

Agreed check to see if you have boost leaks that is the first thing I would have done before asking. It's kinda standard on all boosted cars that are being tuned especially because boost leaks cause issues like yours. My question is are you still recirculating the air from the BOV? Or did you do remove vaccum lines. Spiking happens usually when you have your BOV and waste gate tapped into the same vacuum line. Thats a big no no even when your not running high boost it still causes issues. Let us know