[BeeMuh]

I have a 2007 335i with the following mods:

VRSF 7" FMIC
ER CP with TIAL BOV
AR DPs
JB4 G5 (diodes cut)
Running map 1 (91 Octane)

Last month, after I got my VRSF FMIC installed my car was really fast. Whenever I floor it, turbo kicks in and WHAM! I'm hauling ass. After two weeks, it seems like my turbo 335i is now turbo less. I had my main mechanic double check the entire turbo system and found nothing wrong. I did a factory reset on my JB4 G5, updated to the latest HEX file, changed my spark plugs since I'm at 63k and I have no codes at all on my dash.

As of now, whenever I floor it, my car just makes this sound of air releasing underneath the hood. It's like the harder I floor it, the more air just escapes into the atmosphere. I'm so puzzled on why this is happening. Luckily I do have warranty and will have my SA check it out even with all my mods. My guess is my turbos have failed internally.

[evoix]

Check intercooler connections and couplers. Sounds like huge boost leak

[TrAcK TRaP]

Did you check your intercooler pipe? I dont know if you suppose to loose that much power even if your pipe popped..

[m_fife]

Set your gauge hijacking to display boost and see if it is still building when you are WOT. If not you have a boost leak somewhere.

[buster84]

Originally Posted by BeeMuh

I have a 2007 335i with the following mods:

VRSF 7" FMIC
ER CP with TIAL BOV
AR DPs
JB4 G5 (diodes cut)
Running map 1 (91 Octane)

Last month, after I got my VRSF FMIC installed my car was really fast. Whenever I floor it, turbo kicks in and WHAM! I'm hauling ass. After two weeks, it seems like my turbo 335i is now turbo less. I had my main mechanic double check the entire turbo system and found nothing wrong. I did a factory reset on my JB4 G5, updated to the latest HEX file, changed my spark plugs since I'm at 63k and I have no codes at all on my dash.

As of now, whenever I floor it, my car just makes this sound of air releasing underneath the hood. It's like the harder I floor it, the more air just escapes into the atmosphere. I'm so puzzled on why this is happening. Luckily I do have warranty and will have my SA check it out even with all my mods. My guess is my turbos have failed internally.

Its possible the turbo's are malfunctioning and the wastegates don't close. Do you have wastegate rattle? Another possibility could be your fuel pump. If its getting weak the car won't have enough fuel so the car dumbs down the boost till it works.

1) Check intercooler connections and check to make sure your intake isn't loose. Also check your vacuum lines around the turbo charger.

2) Do a log and post it up on the forums. If your fuel trims are maxed its possibly a fuel issue. If their not and your lpfp doenst dip then its a boost leak, intake leak, or possibly a wastegate issue.

Once you post a log we can help you further.

[GetSomeE92]

Double check your charge pipe to make sure it didn't break. A friend of mine broke his on his 335i and it looked fine when just looking at it (checked at night and the lighting wasn't that great), but was clearly broken if you went to move it around or looked at it while the engine was revved.

[dlbrooks18]

Yes sounds like boost leak somewhere or maybe turbo's have indeed gone. Keep us posted.

[BeeMuh]

Thank you everyone for the input. This car has been a love/hate relationship. I checked the charge pipe and it's not broken. All intercooler connections and couplers have been triple checked. I think my last resort is definitely turbo/waste gate related.

[BeeMuh]

Alright, I just got back from hijacking my fuel guage as boost.

I'm only putting on 5 psi! Every WOT is exactly at 5 psi.

[Dmacc]

Originally Posted by BeeMuh

Alright, I just got back from hijacking my fuel guage as boost.

I'm only putting on 5 psi! Every WOT is exactly at 5 psi.

Major boost leak!

[buster84]

Originally Posted by BeeMuh

Alright, I just got back from hijacking my fuel guage as boost.

I'm only putting on 5 psi! Every WOT is exactly at 5 psi.

Major boost leak or a bad fuel pump. This can happen with a bad fuel pump when my stock one was going bad my car dumbed the psi down to 8 and wouldn't go above. Did logs and noticed the fuel trims maxed, then i also checked for leaks then replaced the pump and it was back to normal.

What tune are you running? with the fuel hijack it sounds like the open flash or the jb4/procede setup.

You really should log the car's fuel trims, boost, LPFP, and and air/fuel ratio and even the waste gate duty cycle (although that i don't know someone else will). A log will help the diagnosis go from questionable to a precise area that we can point you to.

[BeeMuh]

Originally Posted by buster84

Major boost leak or a bad fuel pump. This can happen with a bad fuel pump when my stock one was going bad my car dumbed the psi down to 8 and wouldn't go above. Did logs and noticed the fuel trims maxed, then i also checked for leaks then replaced the pump and it was back to normal.

What tune are you running? with the fuel hijack it sounds like the open flash or the jb4/procede setup.

You really should log the car's fuel trims, boost, LPFP, and and air/fuel ratio and even the waste gate duty cycle (although that i don't know someone else will). A log will help the diagnosis go from questionable to a precise area that we can point you to.

http://www.datazap.me/u/beemuh/jb4-g5

Let me know if that works!

Buster, I'm on Map 1 of the JB4.

[buster84]

Originally Posted by BeeMuh

http://www.datazap.me/u/beemuh/jb4-g5

Let me know if that works!

Buster, I'm on Map 1 of the JB4.

All your fuel trims, air fuel ratio looks good. So its not a fuel related issue. Im not familiar with JB4 logs, but if the waste gate duty cycle is on their someone can chime in on that.

From what i can see it looks like a big leak, or bad waste gates. Do you hear any rattle? I'd also check to make sure your wategate vacuum lines are intact and didn't break off or come off. That might cause a boost issue too.

Btw, have you checked for codes with the JB4?

If not check to see if their are any.

[BeeMuh]

Originally Posted by buster84

All your fuel trims, air fuel ratio looks good. So its not a fuel related issue. Im not familiar with JB4 logs, but if the waste gate duty cycle is on their someone can chime in on that.

From what i can see it looks like a big leak, or bad waste gates. Do you hear any rattle? I'd also check to make sure your wategate vacuum lines are intact and didn't break off or come off. That might cause a boost issue too.

Thanks buster..

As far as waste gate, I do hear a little rattle but not enough to convince me that it is that. I did see the vacuum lines that plug into a black canister but I didn't following it back towards the engine.

[buster84]

Originally Posted by BeeMuh

Thanks buster..

As far as waste gate, I do hear a little rattle but not enough to convince me that it is that. I did see the vacuum lines that plug into a black canister but I didn't following it back towards the engine.

Check for codes and do this test. Its nice of JB4 to have created the ability to do this test.

[C.Pop]

Check your bpv and vacuum lines. 5 psi sounds about right for a broken vac line. When my forge diverter valves would stick open, also 5psi was the magic number (sometimes 8, always too little).

[BeeMuh]

Originally Posted by C.Pop

Check your bpv and vacuum lines. 5 psi sounds about right for a broken vac line. When my forge diverter valves would stick open, also 5psi was the magic number (sometimes 8, always too little).

BPV = bypass valve?

Thank you C pop

[C.Pop]

Yep. By pass valves. There is a vacuum line running from each of the bpv's to a "y", which then feeds to a nipple of the intake manifold. There are a lot of threads about replacing vacuum lines, but that's the first place I'd look. The second place is under the engine cover, but there are a billion walk throughs for that one. Hit me up if you don't have luck and need help finding a good one.

Hearing the air is exactly what my forge bpv's would do when I first got them and they would stick.

[Sean335i]

My car is doing the exact same. Logs pulled show flat boost but level @ 5.

Checking vacuum lines, fmic lines and bypass. Let me know if you find something as well

[Dmacc]

Originally Posted by C.Pop

Yep. By pass valves. There is a vacuum line running from each of the bpv's to a "y", which then feeds to a nipple of the intake manifold. There are a lot of threads about replacing vacuum lines, but that's the first place I'd look. The second place is under the engine cover, but there are a billion walk throughs for that one. Hit me up if you don't have luck and need help finding a good one.

Hearing the air is exactly what my forge bpv's would do when I first got them and they would stick.

Can you describe the noise you were hearing in a bit more detail? I'm trying to diagnose a potential boost leak, with the tune in I see about 4-5psi in closed loop, then when it kicks into open loop my psi is fine. I have a rough transition from closed loop boost to open loop.

[chili36]

I had the same happen to me..it was a Vac line.
Remove engine cover and check all lines.

[C.Pop]

Originally Posted by Dmacc

Can you describe the noise you were hearing in a bit more detail? I'm trying to diagnose a potential boost leak, with the tune in I see about 4-5psi in closed loop, then when it kicks into open loop my psi is fine. I have a rough transition from closed loop boost to open loop.

It sounded like an awful lot of air was rushing through a small tube. Like, 2 small turbo's worth of air through 1 or maybe 2 forge dv outlet tubes, lol. It was clearly different, and not an intake sound like going DCI nets you. Plus, once they sealed, the air rushing sound stopped. I have the ECS vent boost gauge, sounds and a lack of boost coincided perfectly.

I opened/inspected/rebuilt/replaced and all was well for a couple of weeks. The problem then re-appeared. I re-did my rebuilt. Problem went away for a couple more weeks. Talked to Forge, they sent me rebuild kit with new pistons and it's been good for 6+ months, although just recently I've been missing quite a lot of boost at the top of my rpm range, so it's time for me to re-check.