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Rear VRSF 2” Inlet leaking at 1.75” Adapter *HELP*
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03-13-2024, 09:24 PM | #1 |
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Rear VRSF 2” Inlet leaking at 1.75” Adapter *HELP*
Hi Guys, I recently purchased a 2008 335xi awd 6speed manual. Did a boost leak test today and found a large boost leak at the turbo rear inlet adapter. The owner installed an VRSF 2” rear inlet and used a 1.75” adapter to connect to the turbo. I tried tightening the clamp that connects to the adapter with 4 extensions and a 7mm socket but it’s as tight as I can get it. Still leaking just as bad. Seems like a nightmare to get to.. I think I would have to remove the VRSF downpipes to get to this rear inlet adapter.. this thing is leaking and I can hear it with only 5 psi.. what’s weird is the adapter seems to be installed very securely and the previous owner said he is surprised the adapter could be leaking with how solid it was attached to the turbo.
See the attached video. Let me know any thoughts.. can I still drive the car like this? Should I stay out of boost? Any insight would be great. If it were me I would have just installed the 1.75 inlets from vrsf so I wouldn’t have to worry about this adapter situation. https://youtube.com/shorts/C70brEu6N...jLRM6AJaPpFjEd |
03-14-2024, 02:00 AM | #2 | |
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03-14-2024, 04:54 AM | #3 | |
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If you can log it would be good to see how it's running. Last edited by TiAgAu; 03-14-2024 at 05:02 AM.. |
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03-14-2024, 08:59 AM | #4 | |
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03-14-2024, 07:53 PM | #5 | |
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https://datazap.me/u/beasters/log-17...=0&data=3-4-20 I’m new to all this so let me know if there is something else I should be showing in these logs. If you could like me know how this looks. I’m thinking about replacing my boost solenoids to see if that helps hold the boost bettter but overall the car feels good. It’s tuned on mhd stage 2+ bigger FMIC, intake cones, front and rear inlets, charge pipe and box Any input on how the cars running would be great. I hoping to understand what’s right and wrong from lookin at these logs over time. Thanks! |
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03-15-2024, 12:27 PM | #7 |
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Log looks Ok-ish. I personally do not like V10. You can see it requests the same boost target flat to redline. Your Oem turbos cannot keep up with this. You can see the boost dropping halfway through the logs and your waste gate duty slowly going up trying to work the turbos harder to meet the target. You either have a small boost leak or just the oem turbos running out of steam and over working them in the higher rpm’s.
I personally like v7 (my favourite) or v9 is good too. Their boost target tapers towards redline which keeps the small oem turbos happy.
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03-15-2024, 12:38 PM | #8 |
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Your boost solenoids are also fine since you are able to meet target. Holding target boost has nothing to do with the solenoids.
Also keep in mind none of these tunes take upgraded inlets into count. Once you have upgrades inlets a custom tune is always best. Some people overshoot target with these inlets and may trip a code but I don’t think you have that issue.
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03-16-2024, 06:07 PM | #9 | |
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Also I noticed some timing corrections happening on different cylinders in this log. Any big deal? I’ve read adding a couple gallons of e85 to a full tank of 93 octane can help reduce timing corrections? Also any opinions about running e30 tune on stock turbos/ stock fuel pumps? Again I’m a newb, but I used to own an Evo 8 for a few years so I do understand good amount. Just purchased this car a week ago. It’s an 08 335xi at 99k miles.. I’m assuming the turbos are factory. Thanks again for all your help my bimmer brother! |
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03-16-2024, 10:19 PM | #10 | |
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It is taking a little longer than it should to reach peak boost (target) and obviously not able to maintain it either. I would definitely double check for boost leaks. Most common places are the connections to the intercooler , charge pipe to throttle body and check the map sensor on the charge pipe. Those can cause a boost leak if the rubber ring is pinched or cracked. I would avoid any ethonal on factory fuel pumps, it will drag them down too much. If you have upgraded fuel pumps then you could run one of the ethonal maps. You do have timing corrections but they are nothing crazy. An off the shelf tune is not going to be perfect for every car. -Hunt down some boost leaks -Give version 9 or 7 a try they are both good and a little easier on oem turbos. 9 makes slightly more power than 7 but I enjoy the boost curve of 7 more. It’s a kick in the pants. After that do another 3rd gear log. Make sure tc is off as it will prevent throttle closures in the log.
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03-17-2024, 12:07 AM | #11 | |
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03-17-2024, 02:00 AM | #12 | |
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You wont hold boost any better than that up top with stock turbos even though the target calls for 18.6psi. 15psi @ 6000rpm is usually the norm/max for stage 2+ over that they are out there efficiency zone anyway. No boost leaks looks healthy to me. |
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03-17-2024, 07:44 AM | #13 | |
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03-18-2024, 11:34 AM | #14 | |
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I did a hard 2nd gear WOT pull when I wasn’t logging of course and the car built boost and took off no problem but shortly after maybe around 5k rpm fell flat on it face. I had no power at all but had no check engine light pop up on the dash or anything. Car was running really rough at idle. Got to a stop light and turned the car off and back on and everything went back to normal. I checked the codes with MHD and I had 3 new codes 29DC - DME: Cylinder injection cutout. 2C77 - DME: Oxygen sensor after catalytic converter: Signal. 2C78 - DME: Oxygen sensor 2 after catalytic converter: Signal. I reset these codes and restarted the car and all adaptations and everything seems back to normal. I did a very short 3rd gear pull and let off pretty early just to be careful. Here the short log. I’ve read that these codes could mean that the HPFP is going out? Please let me know your thoughts guys. Thanks! https://datazap.me/u/beasters/log-17...og=0&data=3-21 |
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03-18-2024, 01:46 PM | #15 | |
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You over boosted in 2nd gear. This is the issue of having bigger turbo inlets but using an OTS map. Car basically threw itself into a fail safe mode to prevent damage. You will most likely need a custom tune. I suggest going to version 9 or 7. Since they are a little less aggressive it will help you in the mean time.
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03-18-2024, 04:28 PM | #16 | |
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Please see the log on datazap https://datazap.me/u/beasters/log-17...44-45-46-47-49 |
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03-18-2024, 05:53 PM | #17 | |
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I think you are on the right map. It doesn’t usually say the “+”. This is the same map and fuel version I run. The only thing I can see is the low pressure fuel pump is starting to get a little tired. Dipping into low 50s. It’s ok for now but once it start dropping into the 40s you may want to replace. 65-85psi is ideal. This should work for you for now. Keep on mind that hard second gear pulls with your inlets may trigger limp mode. I would plan for a custom tune in the future.
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03-18-2024, 06:57 PM | #18 | |
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03-18-2024, 07:47 PM | #19 | |
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There are tons of great tuners online, I’m not sure off the top of my head tho. I have always been fine with the off the shelf maps. You may have no issues now but if it keeps happening it’s because of your inlets. So see how it goes for a while. V7 is great. No problem at all, glad I could help
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03-18-2024, 09:12 PM | #20 | |
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03-19-2024, 08:43 AM | #21 | |
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Are you manual or auto btw?
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03-19-2024, 12:25 PM | #22 |
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