2G Boost from BOV vacuum line

[2ggst1998]

Thanks yall, ima swing by the auto shop and pick up a set of bpr6es and see uf it does anything, the turbo install should be done by tomorrow so ill fill you guys in after its done, ill also give it another boost leak test just in case.

 

[2ggst1998]

so I had the turbo installed, still nothing. what else could cause a stumble at 5500 rpm. it feels like fuel cut, like I hit a wall. no boost leaks, spark plugs replaced, and turbo replaced. anyone have any clue? ive been trying to tackle this for about a month now.

 

[97_4g63t]

Did you swap plugs? Did you gap them yourself? How high are you boost leak testing? How long does it hold air? Base fuel pressure right? Got any pictures under the hood?

 

[2ggst1998]

Yes i did, bpr6es. Im testing at around 14 psi. When i hook up the blt to the lower intercooler piping all the air goes through the throttle body and out somewhere.

I havent had a chance to take a photo yet but i will asap, its pretty normal in there, only a greddy bov, intake and ic piping

 

[rex4g63]

Is it a studder or is it fuel cut? Fuel cut as I'm sure u know is going to kill your fuel delivery and ignition to save your engine....from my experience it seemed pretty violent during accel. On past cars an ignition problem should be less severe. I would Double check "all ignition" components and connections and if u have a manual boost controller lower your boost to say 12psi and do a pull. Let me know

 

[2ggst1998]

It feels like i hit a wall, ya its pretty violent. I have checked that all, the boost should be stock as im only running on the wastegate solenoid.

And ive got no cels anymore so i dont know what to do anymore

 

[rex4g63]

If you have an upgraded turbo and other mods so your flowing more air and if it's not tuned that's your problem. Go buy a manual boost controller and lower your boost. U can drive the car just stay off the gas

 

[2ggst1998]

I did have a MBC installed at one point, but I uninstalled it because I loosened it all the way but I still had the problem, also I had the CEL for the wastegate solenoid, I believe it was P1103. So I uninstalled the MBC. Also Instead of the 16g installed I went to a wrecker and got a 14b. So would all this still be too much air from a 14b?

Also I haven't installed the 650 injectors either, all I've had installed was the 14b, so should I still install the MBC?

 

[rex4g63]

Not sure if u have a 1G or 2G. If u have a 2 gen. The 14b and 16g turbos flow more air the the stock T25 add in your mods there and u have a problem. Need to install a "new" boost controller and lower your boost until u get some fuel mods and a tune.

 

[2ggst1998]

Ive got a 2g. Ok ill reinstall the mbc when i get out of school, but its a definite fuel cut.

 

[rough]

The MBC won't lower the boost, as the WGA pressure is as low as it goes, around 12psi for the 14b. Unless it has another WGA or MBC there is no reason you should be going over 12 psi.
If you are running without a MBC, you should not be hitting fuel cut unless your pump is on its way out!

The 14b does require more fuel then the T25.
I'd look into replacing that or doing the re-wire mod.

 

[2ggst1998]

Ok but how do some 2g dsm drive totally fine with no modifications when they swap a 14b

 

[97_4g63t]

Yes i did, bpr6es. Im testing at around 14 psi. When i hook up the blt to the lower intercooler piping all the air goes through the throttle body and out somewhere.

I would try testing better first. Use the soapy water and spray every coupling, vacuum hose, injector seals, bov adjustment screw, afpr screw, brake booster line, all over throttle body and listen inside the cab. You have an aftermarket boost gauge? If so make sure your gauge is reading at least 15psi. I test to 40 psi and normally have to set my regulator to 45 or 50. Sounds to me like you have boost leaks still. How are all your vacuum lines ran? Some pictures would really help.

Not sure if u have a 1G or 2G. If u have a 2 gen. The 14b and 16g turbos flow more air the the stock T25 add in your mods there and u have a problem. Need to install a "new" boost controller and lower your boost until u get some fuel mods and a tune.

If he is already just running off vacuum, installing a boost controller is not going to help. You can't lower it more with a boost controller

 

[2ggst1998]

Where would u suggest i attach the tester, i hooked it up to the the throttle body and lower intercooler piping. Should i attach it to the turbo inlet? And wouldnt 40 psi damage something?

Also the boost gauge sits like 2cm too high at idle, it doesnt rest at the bottom if the gauge in the car, idk if this anything

 

[97_4g63t]

Where would u suggest i attach the tester, i hooked it up to the the throttle body and lower intercooler piping. Should i attach it to the turbo inlet? And wouldnt 40 psi damage something?

you don't have to test that high. I'm running over 30 psi so that's why I test that high. I would just test to like 15 or 20 if I was you. The stock boost gauge is useless.
Attaching it to the turbo tests everything. That's where I test. What kind of tester are you using? You Really need a wide band and aftermarket boost gauge.

 

[2ggst1998]

I'm using a DIY tester, it works good. But I don't believe I should need any of that for a car that has such limited mods like mine. I believe it should be easy to find I just needa keep digging

 

[rough]

Ok but how do some 2g dsm drive totally fine with no modifications when they swap a 14b

Could be something wrong with the WGA sticking, could be a modified ecu..

Could be a failing fuel pump or clogged fuel filter. Injectors could be clogged.

Just because one person slams a 14b on and has no problems, doesn't mean you will have the same results as they had!

 

[rough]

I'd take a read through this link http://www.dsmtuners.com/threads/overboosting-bad-wastegate.488041/

They talk about how to check your WGA, which is your minimum boost pressure, once it hits 12 psi it opens up. You shouldn't be hitting fuel cut till around 18ish psi on the 14b from what i've read.

 

[2ggst1998]

But this car has had this problem even with the t25 which leads me to believe its something else, also my car has just been serviced so, new fuel filter, timing belt, ive swapped identical injectors with still no luck. Checked for boost leaks and had two, i sealed those up. Maybe i should start to downgrade my car until its completely stock. Like removing the ic piping, bov and intake

 

[rough]

Ineteresting, Anyway you can get a video? Have you opened up the ecu yet?

 

[1QUICKDSM]

You should definitely address your CEL issues and go ahead and perform a BLT while your at it. Also look into maybe getting new plugs and wires.

 

[rough]

Life is grand, I'm having similar issues now that has randomly appeared. I myself will be running a BLT tonight, as I just installed new UICP and BOV thinking the OEM plastic pipe was the problem, well it was partly the problem, Wouldn't hold pressure at 19psi. Now I can make it to about 6k before it cuts. I will be BLT'n for 30 psi.

Only thing that I changed since this happened was a wally 255 and 660'cc injectors "i'm not sure they really are 660cc from how low I had to scale them" Even after these two were installed I had no problems, just happened one day when I floored it and hit what seemed to be fuel cut, I looked at the wideband and she was in the 9 range.

I thought maybe it could be my tune so I put a stock rom back on, car runs the same as my tune, which is another reason I believe the injectors I was sold are so not 660cc!

 

[enriquez2000]

If you swapped injectors right before this started check your seals. Should use new ones on every injector swap.

 

[rough]

I always use new seals I need to do the BLT, I crashed out the other night, just need to stop being lazy!

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[enriquez2000]

I always use new seals I need to do the BLT, I crashed out the other night, just need to stop being lazy!

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Hmmmm those seals failed on me immedieatly with those style injectors... may want to check. Those should require an fic seal kit