Feels like it hits a wall

[GSTdude06]

Just installed greddy piping along with a greddy bov (dont know which type) and its trying to boost over 15 and when it does it feels like its hitting a wall, like no fuel or somthing. Like its dead or something idk anyone got any ideas of whats the problem? Every clamp is the tightest it can be. I have a mbc hooked up I believe its the correct way cept that on the BOV theres 2 nipples, one goes to the intake manifold, the other the mbc? The a line from the wastegate to the side of the mbc?

I cant understand whats going on and I cant come close to flooring it.


Major boost leak?

Fuel Cut?




I have uncontrollable boost.




-Logan



Help is Thanked For Greatly!

 

[Justins99GSX]

The second nipple on the BOV is only used for a secondary boost source to help the BOV react quicker, as far as hooking your MBC up to that I would undo it.. Find the hose coming off the compressor housing take it off the car EBC (its the little sensor underneath your airfilter) plug the hose on to your MBC and then back to your wastegate... Turn your MBC all the way down and do 3rd or 4th gear pulls until you get the boost you want... good luck and let us know if it worked...

Justin

 

[MyBeatGSX]

Major boost leak?

Fuel Cut?




I have uncontrollable boost.

Maybe both..

Is everything hooked up correctly? You might have all your vacuum lines hooked up wrong and you're blowing all your boost out somewhere you shouldn't be, making you hit fuel cut and at the same time not sending any signal to the wastegate which gives you the run away boost....

 

[GSTdude06]

ok so no hose goes to that second nipple?

and I don thave a compressor nipple nor do I have a j pipe nipple............


14b turbo dont have a compressor nipple and the install kit j pipe doesnt have a nipple, where to tie the otehr line to now? Tape into the BOV line?

 

[Justins99GSX]

ok so no hose goes to that second nipple?

and I don thave a compressor nipple nor do I have a j pipe nipple............


14b turbo dont have a compressor nipple and the install kit j pipe doesnt have a nipple, where to tie the otehr line to now? Tape into the BOV line?

Sorry didnt know you had a 14b, you can tee the line coming from the intake to BOV to your MBC, then from your MBC to the wastegate
hope that helps

 

[alex99gst]

I had a problem similar to yours just a while ago. Turn down the boost to maybe 10psi just to test it out and see if it happens then. I had a major boost leak and I was running 14psi. I couldn't get past 4k rpm's without hitting fuel cut. Fixed the leak and turned it down to 12 and everything worked fine again. I would do a boost leak test and make sure you don't have any leaks. I was confident I didnt have anyWTF

 

[GSTdude06]

Ok ill tie it into the line, now that second nipple....what do i do about that? Leave it just sitting there?



Ill do a boost leak test tomorrow what I get home, I dont think I have any leaks unless its alot of small ones around my intake manifold. I got a small on at my BISS screw but I cant seem to get that dang thing out of there.

-Logan

 

[alex99gst]

I would plug the nipple

 

[GSTdude06]

what exactly is that nipple for??

 

[~laser_craver~]

Run a hose from the nipple on the wastegate tot he mbc, then run a hose off the second nipple on the mbc and run it to a T fitting. Have on side fo the T fitting go to the intake manifold and the other tot he bov nipple. Then do a boost leak test. Fix all leaks. Set the boost to the apporpriate level by doing a 4th gear pull and adjusting the mbc slightly each time. You do not want to turn it up to high.

 

[GSTdude06]

ok I have all that hooked up correctly, did boost leak test, ait just runs out the breather hole on the side of the mbc, bad? good?......i taped off that hole till I could check for any other leaks but I found none. I did put a new oring on my BISS tho it was leaking.


Bad MBC? Sopose to leak all the air out of there? I wouldnt think so but im just a newb.




And besides all that I got another question on here....


My 255 walbro fuel pump is REALLY LOUD......normal?

I have the rewire kit hooked up to it, seems to of made it louder......normal?


Thanks everyone

 

[4G63Boosted]

the walbro being loud is perfectly normal.

 

[GSTdude06]

ight thanks for that I thought it might of been broken.


ok now the major problem.....the results..

ok I have all that hooked up correctly, did boost leak test, ait just runs out the breather hole on the side of the mbc, bad? good?......i taped off that hole till I could check for any other leaks but I found none. I did put a new oring on my BISS tho it was leaking.


Bad MBC? Sopose to leak all the air out of there? I wouldnt think so but im just a newb.

 

[MyBeatGSX]

I believe it is supposed to leak out there, if its the bleed valve style MBC. That's how it controls boost by venting (bleeding off, hence the name) pressure instead of sending it all to the wastegate.

 

[~laser_craver~]

And after doing all that your car still hits fuel cut?

 

[GSTdude06]

Im not sure if its fuel cut or what it is.

But it seems to want to try and boost over 15 and when it does and seems like its just getting no fuel or something, It wont go and like bogges down.

I dont know the problem and my mbc doesnt seem to work for controled boost.

No matter the setting it still tries to go over 15.



I thought it was the pump so I got a 255, still have to problem. Maybe change the settings on my SAFC??

 

[alex99gst]

Im not sure if its fuel cut or what it is.

But it seems to want to try and boost over 15 and when it does and seems like its just getting no fuel or something, It wont go and like bogges down.

I dont know the problem and my mbc doesnt seem to work for controled boost.

No matter the setting it still tries to go over 15.



I thought it was the pump so I got a 255, still have to problem. Maybe change the settings on my SAFC??

Read this: http://www.dsmtuners.com/forums/showthread.php?p=1169130#post1169130

 

[GSTdude06]

ok, I did, so I should test my waste gate? Bad wastegate maybe

Port Polish the hole and get a bigger flap

something along those lines I saved it so I can look whenever.



Thanks

 

[alex99gst]

It sounds like you either don't have the boost controller hooked up right or it is boost creep. The correct way to cure boost creep is with proper porting.

 

[GSTdude06]

well would it be cause of a crap mbc??


cause I can bet anything that mine is probly crap

 

[GSTdude06]

ok update.....


Just took it for a drive...


Went to a long street I no, no cops just open


Tried to go........got it to around 35% trottle

Car bogged down and went exactly like this with no boost blah blah boo blah bo blah BOOM! and right when it went BOOM a little fire came out my exhaust tip.


I still think my mbc is crap but what do yall think of about that

 

[MyBeatGSX]

Still sounds like a HUGE boost leak. All your metered air is getting blown out somewhere, but all that extra fuel isn't. That = waaay rich, no power, lots of booms.

 

[GSTdude06]

I do leak test and I cant hear anything at all........it all leaks out the mbc breather hole thingy so i taped it off for the test n couldnt hear nothing


where are some ideas where they can be?

 

[MyBeatGSX]

Well first off, tape isn't going to hold ANYTHING.

Second, take that tape off right away. Plugging the bleed hole makes the MBC useless.

Let's get a baseline and do things in logical order. Take the MBC out completely. Just hook the wastegate directly to manifold vacuum. Did that fix your problems? How is it boosting now?

You just went from uncontrolled boost to no boost. How did that happen?

When you say its going "over 15", is that 16psi....17psi....30psi?? If its 16-18psi that's probably just creep. If its hitting 20psi+ then you have a problem.

Is the wastegate opening? If you're boosting past spool rpm at WOT and only making at or under your set boost and the wastegate isn't opening then you have a massive boost leak.

You also need to determine if you're actually hitting fuel cut or if the car is just bogging because of a lean/rich condition. If you hit fuel cut then you'll know it. Take your buddy's civic (or other low speed limiter car) out on the highway and drive it until you hit the speed limiter. THAT is fuel cut, its violent and you'll know if you hit it, its not just a "bog".

What does your high throttle AFC map look like? What are your high/low change over points at? Do you have the sensor type set correctly?

How does the car drive under normal conditions, light boost, low throttle, etc? Is this only a WOT problem?

Did you remember to plug the MAF back in? Did you somehow damage the wiring to it or another sensor during your piping install?

From now on, every test you do should be without the MBC on the car, until you can narrow down what is causing your problem, it takes out a big variable.

The possible causes are endless, just remember, details are your friend

 

[alex99gst]

where are some ideas where they can be?

I had a huge leak at the turbo outlet elbow and I didn't even know it. It turns out that I was able to hand tighten the bolts down, thats how loose they were. I would check there and any other connections where you could tighten the clamps down.