Installed a 14b and the same problem occurs

[boosted954g63]

So i just spent a whole day putting in a 14b turbo to get rid of some problems that i thought they being caused by a bad turbo. So i replaced the turbo and took it for a spin and still has the same problems as before. When ever i go to about 3500 RPM with any boost above 7lbs it starts bucking, stalling and feels like it is hitting a brick wall. Any thing under around 7lbs its fine in the higer rpms. this has puzzled me for almost a year and a half and i need to get it solved. All mods are updated in my profile.
Thanks Nick

 

[kenamond]

If you can get a logger, that will probably help you ALOT.

Perhaps your fuel pressure is low, and you've hit the duty cycle limit on your injectors and are getting fuel cut as a result (low fuel pressure means your injectors have to open longer to deliver the correct amount of fuel).

Hard to diagnose with so little information.

 

[Burnett03]

So i just spent a whole day putting in a 14b turbo to get rid of some problems that i thought they being caused by a bad turbo. So i replaced the turbo and took it for a spin and still has the same problems as before. When ever i go to about 3500 RPM with any boost above 7lbs it starts bucking, stalling and feels like it is hitting a brick wall. Any thing under around 7lbs its fine in the higer rpms. this has puzzled me for almost a year and a half and i need to get it solved. All mods are updated in my profile.
Thanks Nick

ever heard of a datalogger or boost leak tester?

 

[Gamble97]

Agreed, I vote boost leak. I had the same problem, fuel cut all over the place. Found a small leak, fixed it and haven't had a problem since.

 

[Eastwood95]

sounds like a boost leak to me also...........is the idle erratic?

 

[FusionTalon]

http://www.dsmtuners.com/forums/showthread.php?t=169435

http://forums.audiworld.com/a4/msgs/1659806.phtml

here are some links to boost leak testers and how tos. I know one is an audi but a turbo is a turbo. Good luck, definately sounds like a boost leak, and your getting fuel cut because of it. Im assuming you have the stock injectors correct? because if you dont, it could also be that your fuel pump is not supporting the bigger aftermarket injectors with enough fuel, and cutting out because its not powerful enough to.

 

[boosted954g63]

A boost leak test and geting a logger is definitly on my list to do. Most of my mods were put on my car to get rid of this problem. Its been happening ever since the only mod was intake. The idle is a little bit irratic but most times not too bad. I still have the stock 450 injectors in the car. Thanks for every ones help.
Thanks Nick

 

[Eastwood95]

other symptoms of a possible small boost leak are horrible gas mileage, throttle response, and extra black "soot" collecting into and shooting out of the muffler........aka fuel, let us know what you find.........

 

[CanadianTSi]

Boost Leak...Simple as that.

 

[boosted954g63]

Ok did a boost leak test and i have a feeling this is bad. Did the test with like 35lbs on a compressor and i found a 2 leaks fixed one of them and the other was coming out of the throttle body. So i was trying to find the leak and it is like my 10th time putting air into it and all the suddin i hear what sounds like a duck quack and i look down at the ground and oil is spewing out of the oil return line. The oil return line that i got with the install kit had the hose that hooks up to the fitting and it was coming out of the top and the bottom of the pipe. I was thinking did i blow a seal in the turbo? I HATE DSM's......Right now i do at least .
Thanks Nick

 

[Talesin]

Given that most people only test to 20psi, possibly 25, and only go higher if they're running mid-20 psi boost... I wouldn't be surprised if you blew one of the turbo seals out with 35psi on a cold turbo.

Supposed to just pump it to 20psi, then see how long it holds, and where it's leaking from exactly. But yeah, from your description it just sounded like you had a pretty good boost leak.

 

[boosted954g63]

Well i could not hear where it was coming from at all cause it was so faint. Thats why i turned u it up more cause i could not hear it. So you think that i blew a seal in the turbo too?
Thanks Nick

 

[bushy]

Next time take a spray bottle filled with soapy water and spray it where the air sounds like it is coming from.

The water will bubble where the air comes out.

 

[boosted954g63]

Well i hardly could hear the hiss thats why i turned it up and i had no clue where it was coming from so i could not have sprayed soapy water on it. O well time for another turbo i guess or any one else has a sugestion?
Thanks Nick

 

[kenamond]

Fix the seals in your turbo?

 

[boosted954g63]

How hard is that?
Thanks Nick

 

[kenamond]

Here is a turbo rebuild site at vfaq. It's for a different turbo, but you get the idea. About half way down are the seals you probably blew (there are only 2 rubber seals for the turbo on that page). Ask around and do your research for your 14b. Basically, I don't think the turbo is totalled, and if you were gonna buy a new one, then you can mess up trying to fix this one and be not too much worse off (you'd have spent some time trying to fix the turbo, but that's some good info to know anyway).

 

[mavisky]

Mix a little dish washing soap and water or get some Windex and spray down the entire intercooler piping system. Everything from the turbo intake to the cylinder head.

 

[Spoolin4Ever]

It could be the plugs also. Yeah pout 35 lbs in it and you will give yourself a boost leak.

Do it again with only 20 lbs.

Put in some new NGK plugs.

What all things have you replaced trying to fix this?

Is the 14B a used turbo? Does it smoke?

 

[boosted954g63]

Will it run any ways with the blown seal. I dont think that it would matter if i did the boost leak test again at 20 cause i already blew the seal unless you think that i should. The plugs are about 1.5 old and almost everything i did in my profile i replaced just to get rid of this problem. I am clueless on what this could be. Any help would be great.
Thanks for all the help.
Nick

 

[kevstyle]

ECU maybe

 

[GVR4592]

I wouldn't run the engine with a turbo seal leaking. If oil gets into the combustion chamber it can cause severe detonation and damage your engine. As for the bucking problem. It is usually caused by a lean or rich condition. Sometimes it can be ignition related, but most times it is fuel. Any boost leak can cause a rich condition under boost which sometimes causes the symptoms you described. Was the throttle body leak a large one?

 

[boosted954g63]

Thanks for all the great responces!! I could not tell how big the leak is by the throttle body it did not give me enough time to check it. I am free tommarrow so do you guys think i should do the boost leak test with 20lbs?
Thanks a bunch.
Nick