N54Tech.com - International Turbo Racing Discussion

N54Tech.com - International Turbo Racing Discussion (https://www.n54tech.com/forums/index.php)
-   N54 (https://www.n54tech.com/forums/forumdisplay.php?f=3)
-   -   335i Boost problems (https://www.n54tech.com/forums/showthread.php?t=19890)

jamesmurray 05-27-2013 06:46 AM

335i Boost problems
Hi guys, I've been a long time lurker, but have never posted until now!

Anyway I've noticed for a while now that my 335i is a little flat under part throttle, and occasionally there has been major lag when going WOT and revving it through the rpm's. I've replaced the vacuum hosing the runs from the vac pump to the vac capsules but this hasn't really improved things. It was much worse yesterday when I drove the car reasonably hard, as there was a large step in power, it was like the engine was straining, then it took off.

I decided today to follow Terry's video guide about testing the solenoids using a vac gauge a the JB4. At idle I was seeing 3-4in HG and when revved it went to about 13in HG. This was with future use D set to 99 as outlined in the video. From the results I'm thinking that I have a dead solenoid. Anybody else have any ideas?

My mods are; JB4 G4 Map 5, BMS OCC



Russell @ BMS 05-27-2013 10:23 AM

Test each solenoid separately by removing the Tee.
Does look like something is wrong.

jamesmurray 05-27-2013 12:14 PM

Thanks for the information. So would I plug the vacuum gauge into the output from the solenoid to the waste gate for each boost solenoid? What reading should I expect to see? Thanks


All times are GMT -7. The time now is 03:31 AM.

Copyright 2007 - 2020, N54tech.com