|
|
|
|
|
|
BMW Garage | BMW Meets | Register | Search | Today's Posts | Mark Forums Read |
|
BMW 3-Series (E90 E92) Forum
>
taking n55 335xi in to dealer - car seems slow
|
|
03-30-2013, 02:17 PM | #1 |
Enlisted Member
3
Rep 39
Posts |
taking n55 335xi in to dealer - car seems slow
I don't know where to begin, but my '12 335xi coupe just seems to not be building the boost it should. My car is bone stock with 10k on the clock, and I don't have the time/expertise to run a boost pressure test. I want to take the car into the dealer and have them check it out, but my issues are just so vague. I'm not sure if they will actually test things out or turn me away because nothing is actually 'wrong' with the car.
It definitely feels noticeably slower than even 5k miles ago. Here are my observations: -When the motor is cold, the car is ungodly slow. -The BOV hiss sound seems to kick in at odd times even under full throttle -At over 5k rpms under load the power band seems to die Do you think it's worth a trip to the dealer? |
03-30-2013, 02:50 PM | #2 |
Lieutenant
34
Rep 493
Posts |
1) You shouldn't be putting more than a feather's touch on the motor when it's cold - keep it under 3k rpm's until the motor warms up. Wait until temps have risen to 200 degrees or higher.
3) the max hp/tq in the 335 N55 comes very early. Max Torque is at 1200rpms for example.
__________________
'13 E92 335is
|
Appreciate
0
|
03-30-2013, 11:17 PM | #4 |
Banned
17
Rep 493
Posts |
Can't say anything helpful other than on number 3. You can thank the small single twinscroll turbo for that one. The turbo's efficiency basically dies past 5k Rpms, and you're actually losing boost pressure at that point.
|
Appreciate
0
|
04-01-2013, 08:55 AM | #5 | |
Lieutenant Colonel
99
Rep 1,597
Posts |
Quote:
Did you guys ever think about the concept of the N55? BMW mounted a small turbo because they wanted a lag-free response of the engine! They have a max torque curve starting at 1200 RPM and ending past 5000 RPM. That is the RPM you would normally use in a daily drive base... They did NOT design the engine to be tuned past 400 hp and they did NOT design it for people driving it like bogus... They really did an excellent job on the engine and they need respect for this!!!
__________________
BEFORE: 130i N52 (2006-2011)
NOW: 335xi N55 (2011- ) |
|
Appreciate
0
|
04-01-2013, 04:11 PM | #6 |
Private First Class
10
Rep 163
Posts |
|
Appreciate
0
|
04-01-2013, 04:58 PM | #7 |
Lieutenant
16
Rep 459
Posts |
|
Appreciate
0
|
04-09-2013, 04:40 PM | #8 |
member
43
Rep 187
Posts
Drives: 2012 335i XDrive E92
Join Date: Jul 2010
Location: USA
iTrader: (0)
Garage List 2014 Porsche Cayman [0.00]
2016 Volvo XC70 (sp ... [0.00] 2012 BMW 335i xDriv ... [0.00] 2006 Volvo XC70 (sp ... [0.00] 1993 Pathfinder [0.00] |
Definitely NOT slow...
__________________
2012 335i X Drive Coupe - BSM/Black, 6MT, M Sport, Premium, Navigation, Apps, Black Grille, 313 Wheels, and more...
|
Appreciate
0
|
07-03-2013, 01:18 PM | #9 |
Captain
269
Rep 607
Posts |
LOL so defensive... my car felt really slow stock but that's compared to my previous Evo 9. With JB4 it's better but there's no violent acceleration like the Evo has.
|
Appreciate
0
|
07-03-2013, 03:39 PM | #10 | |
Came to the N55 Darkside
1107
Rep 12,740
Posts |
Quote:
|
|
Appreciate
0
|
07-03-2013, 04:30 PM | #11 | |
tuned n dropped 335xi
12
Rep 332
Posts |
To the OP... if you can feel a difference from your butt dyno, than I would take it in. The mechanic should know what the car feels like accelerating and can run logs to make sure the boost is hanging in there and pushing the power it should. its a $55k car, its definitely worth it to make sure your 335 runs like a 335 and not a 328!!
If you get a tune (JB4 FTW!!), its only 300 or so bucks now a days, and you can easily tell if there are issues using that software. You can even make one of your gauges a faux boost gague! The XI should make zero difference in speed. Maybe handling... but definitely not speed. Quote:
the n55 is a bigger turbo than the twin turbos on the n54. the n54 definitely spools up faster and IMO is a better engine... however!!... the "twin scroll" of the bigger n55 turbo helps eliminate some turbo lag that bigger turbos usually have by restricting the airflow and pressure thus getting higer boost quicker, which leads to great torque at ~1500 rpms. no bashing for sure! N55 is a great engine! but bigger turbos have their positives and their negatives regardless of the nameplate on the car.
__________________
335xi - BMS DCI - VRSF DP's - JB4 Tune - KW v1 -
|
|
Appreciate
0
|
07-03-2013, 06:36 PM | #12 |
Major
76
Rep 1,035
Posts |
This might be stupid, but have you ever looked at your chargepipe? Even with a stock engine, they are still known for cracking.
__________________
2011 Alpine White E92 335i M-Sport N55 Engine
|
Appreciate
0
|
07-04-2013, 07:42 AM | #13 |
Second Lieutenant
21
Rep 253
Posts |
good point....I had a similar issue with my ER charge pipe not being installed properly...car felt 10 times better once that was fixed.
|
Appreciate
0
|
07-07-2013, 09:41 PM | #14 |
First Lieutenant
32
Rep 373
Posts |
This idea is entirely wrong, as are all the naysayers in this thread spreading misinformation. The XI's are significantly slower than the RWD versions. AWD saps a good amount more power due to additional parasitic loss, the figures are 10-18% drivetrain loss for RWD cars and 17-28% for AWD. FWD cars have much shorter drivetrains and lose 10-15%.
Additionally, auto cars lose 2-5% more than manual cars. You'll never see an X-drive car put down as much power mod for mod as a RWD model, and they're also a bit heavier. On the bright side you can launch the hell out of them and they do extremely well in adverse road conditions.
__________________
2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk
|
Appreciate
0
|
07-07-2013, 09:59 PM | #15 | |
Lieutenant
16
Rep 459
Posts |
Quote:
|
|
Appreciate
0
|
07-07-2013, 10:11 PM | #16 | |
First Lieutenant
32
Rep 373
Posts |
Quote:
That's the context, his thoughts couldn't be clearer- he thinks that the XI option only affects handling, and not speed. He, and anyone else who believes that is flat out wrong, XI cars are significantly slower in a straight line than RWD cars. Sure is a lot of butthurt going around, maybe you ought to read better
__________________
2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk
Last edited by hetzle; 07-07-2013 at 10:20 PM.. |
|
Appreciate
0
|
07-08-2013, 09:56 PM | #17 | |
Lieutenant Colonel
245
Rep 1,595
Posts
Drives: 2011 335i xDrive Msport
Join Date: Apr 2013
Location: Orlando
|
Quote:
|
|
Appreciate
0
|
07-08-2013, 10:57 PM | #18 | |
First Lieutenant
32
Rep 373
Posts |
Quote:
__________________
2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk
|
|
Appreciate
0
|
07-11-2013, 04:12 PM | #19 |
tuned n dropped 335xi
12
Rep 332
Posts |
XI is slower, but dont tell me they are 20% slower. I run high 12's with a JB4 and DCI only, trapping about 106-107 mph which is only about .5 or less seconds off a similarly tuned rwd. Slower car yes, due to some loss of power through the AWD system, but they are not significantly slower. I also have auto trans, which loses even more power, and still am right along side manual 335i's
__________________
335xi - BMS DCI - VRSF DP's - JB4 Tune - KW v1 -
|
Appreciate
0
|
07-11-2013, 06:58 PM | #20 |
Private First Class
10
Rep 163
Posts |
At what distance does the loss of power become noticeable? I know the rwd is quicker in the 1/4 mile but which one is quicker 0-60 and by how much?
|
Appreciate
0
|
07-11-2013, 09:46 PM | #21 | |
Lieutenant Colonel
245
Rep 1,595
Posts
Drives: 2011 335i xDrive Msport
Join Date: Apr 2013
Location: Orlando
|
Quote:
|
|
Appreciate
0
|
07-11-2013, 11:31 PM | #22 | |||
First Lieutenant
32
Rep 373
Posts |
Quote:
On the 1/4 mile stuff- Your ET is lower because you can launch better, but you'll be trapping 2-3 MPH lower than RWD cars (assuming equal drivers/mods). That's the difference between a stock 335i and a tuned one. 2-3 MPH is roughly a car length, which is a significant, every-day measurable amount. Maybe you and I have different definitions of "significant" Quote:
Quote:
__________________
2011 335i sedan 6MT, 515whp/530wtq. Pure Turbo Stage 2, Motiv SST TwinDisk Clutch/FW, Motiv Flash, AA 4" DP, ER FMIC, AA turbo-back exhaust, Quaife LSD, ST Coilovers, BMS Intake, UUC DSSR+SSK, ER CP, BMS CDV, BMS OCC, Arkym CF trunk
|
|||
Appreciate
0
|
Bookmarks |
Thread Tools | Search this Thread |
|
|