New turbos replaced under warranty- car feels slow? - BMW 3-Series (E90 E92) Forum

KaiserN54 · 09-27-2012, 02:58 PM

Well, I just got my car back with new turbos installed (under warranty) and new vacuum solenoids. Expecting it to feel like new, I was happy to get on the highway....but something feels off. Like I am not making full boost consistently. No way to log, car is stock for now. One weird observance- in third gear, WOT, the rpms would climb non-linerally ( fast-slow-fast-slow-fast-slow), but this phenomenom ceased after driving for a while. Yet, no CEL's or SES's So:

1) Is this just getting used to a stock car?
2) Is there some sort of break-in for the turbos before they will operate fully?
3) Could this be a boost leak somewhere, or what else could it be?

pinky_and_me · 09-27-2012, 03:00 PM

Most likely the ECU was reset so it has to relearn everything.

King mode · 09-27-2012, 03:23 PM

If it continues, I would bring it right back to the dealer and take them for a drive and show the issue...

uniter · 09-27-2012, 03:29 PM

Ecu is usually good about throwing codes. That said I'd have driven the car right back.

ken1137 · 09-27-2012, 07:41 PM

Sounds like the dealer made a stupid mistake by blocking your waste-gate actuator arm with the v-clamp on the DP's. Check yourself or go back to the dealer...it is an easy fix if that's it. GL

enrita · 09-28-2012, 04:25 AM

you would throw underboost or overboost codes. maybe your car had a flash tune on and now they reflashed to stock.

Mangler · 09-28-2012, 06:42 AM

Quote:

Originally Posted by pinky_and_me

Most likely the ECU was reset so it has to relearn everything.

This gets thrown around too much. The ECU does not have to 'relearn' enough to make enough of a difference to feel it. The only thing it makes permanent adjustments to are the PID files for the WGDC control. Its not like its changing timing advance or vanos angles or anything. I could be totally out in left field here, but I just don't see it.

T

bigdaddycane · 09-28-2012, 06:52 AM

OP,

Did your car have a tune prior to the turbo replacement?

The dealer could have updated the factory software to the latest version, which a lot of folks do not like.

the combination of no aftermarket tune and the new factory software version could make the car feel slow.

KaiserN54 · 09-28-2012, 09:56 AM

Quote:

Originally Posted by bigdaddycane

OP,

Did your car have a tune prior to the turbo replacement?

The dealer could have updated the factory software to the latest version, which a lot of folks do not like.

the combination of no aftermarket tune and the new factory software version could make the car feel slow.

I think this is it. I have tried, tried, tried to get it to throw a code. No dice. Went back to the dealer, and the foreman and I went for a ride. Car definitely feels faster from the passenger seat. I think it's all in my head. I was sooo used to 400+ whp that yeah, the car feels muted. On the plus side, I've never heard an N54 that didn't rattle, so it is really weird to just hear the engine now, even on decel. Time to put everything on + flex fuel.

themyst · 09-28-2012, 11:01 AM

Dyno the car if you need confirmation of the power you're making. Butt dynos are about as accurate as weathermen.

BobVader · 09-28-2012, 11:41 AM

Samething for me 2 years ago. After changing turbo car feel slower...only 12-13psi on my gauge boost...after 2 days all come back normal. Probably ecu adapting...

Bakeme521 · 09-28-2012, 11:55 AM

Quote:

Originally Posted by Mangler

This gets thrown around too much. The ECU does not have to 'relearn' enough to make enough of a difference to feel it. The only thing it makes permanent adjustments to are the PID files for the WGDC control. Its not like its changing timing advance or vanos angles or anything. I could be totally out in left field here, but I just don't see it.

T

Yes, but those 2 things you just mentioned make a difference in how the car "feels" even though it may not make any more/less power, just feels like it is.

dicostal · 09-28-2012, 12:35 PM

Quote:

Originally Posted by BobVader

Samething for me 2 years ago. After changing turbo car feel slower...only 12-13psi on my gauge boost...after 2 days all come back normal. Probably ecu adapting...

it is more likely that the driver was adapting :-)

BlueLion · 09-28-2012, 01:06 PM

i had mine replaced....and the car drives like new

JamesM3M5 · 09-28-2012, 03:25 PM

Quote:

Originally Posted by themyst

Butt dynos are about as accurate as weathermen.

Nice, I'm going to use that quote from now on.

A stock 335 is slow, anyway.

sickem · 09-28-2012, 03:41 PM

Quote:

Originally Posted by JamesM3M5

A stock 335 is slow, anyway.

I get annoyed when I'm going to get E85 and have to run map 0 to the gas station!

themyst · 09-28-2012, 05:53 PM

Quote:

Originally Posted by sickem

I get annoyed when I'm going to get E85 and have to run map 0 to the gas station!

Just don't go full WOT on your trip to the gas station.

sickem · 09-28-2012, 07:30 PM

Quote:

Originally Posted by themyst

Just don't go full WOT on your trip to the gas station.

On rt 22 in union? Impossible!

King mode · 09-28-2012, 08:54 PM

Quote:

Originally Posted by BobVader

Samething for me 2 years ago. After changing turbo car feel slower...only 12-13psi on my gauge boost...after 2 days all come back normal. Probably ecu adapting...

Curious, is your 1/4 time in your sig actual from a track or vbox?

Thumperx · 09-29-2012, 08:39 AM

Quote:

Originally Posted by atomos319

I think this is it. I have tried, tried, tried to get it to throw a code. No dice. Went back to the dealer, and the foreman and I went for a ride. Car definitely feels faster from the passenger seat. I think it's all in my head. I was sooo used to 400+ whp that yeah, the car feels muted. On the plus side, I've never heard an N54 that didn't rattle, so it is really weird to just hear the engine now, even on decel. Time to put everything on + flex fuel.

I can confirm this. I too had turbo actuators, all injectors, and coils replaced at the same time, under warranty (work done 37K). This work required upgrading the car's software which made the car lethargic. Placed the Vishnu V5 back in, proof, back to normal plus more.

09-27-2012, 02:58 PM	#1
KaiserN54 Second Lieutenant Drives: 2007 335I Join Date: Mar 2012 Location: Turbotown Posts: 218 iTrader: (0)	Well, I just got my car back with new turbos installed (under warranty) and new vacuum solenoids. Expecting it to feel like new, I was happy to get on the highway....but something feels off. Like I am not making full boost consistently. No way to log, car is stock for now. One weird observance- in third gear, WOT, the rpms would climb non-linerally ( fast-slow-fast-slow-fast-slow), but this phenomenom ceased after driving for a while. Yet, no CEL's or SES's So: 1) Is this just getting used to a stock car? 2) Is there some sort of break-in for the turbos before they will operate fully? 3) Could this be a boost leak somewhere, or what else could it be? Last edited by KaiserN54; 09-27-2012 at 03:08 PM.
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09-27-2012, 03:23 PM	#3
King mode First Lieutenant Drives: 335xi Join Date: May 2012 Location: Denver Posts: 300 iTrader: (0)	If it continues, I would bring it right back to the dealer and take them for a drive and show the issue... __________________ 2008 335xi AT Cobb AP stage 1, drop in filter, the rest stock 13.10@106.01 w/ 1.86 60' (5,800' altitude)

09-27-2012, 03:29 PM	#4
uniter Black on Black on Black. Drives: 335i/6mt Sport,Nav,Prem. Join Date: Feb 2010 Location: New Hope, PA Posts: 362 iTrader: (1)	Ecu is usually good about throwing codes. That said I'd have driven the car right back. __________________ LEMANS BLUE M-TECH E92->PROCEDE REV3::ETS 7" FMIC::RACELAND DPS::WAVETRAC DIFF::DEFIV DIFF LOCKDOWN::DEFIV OCC::DEFIV INTAKE::RB PCV

09-27-2012, 07:41 PM	#5
ken1137 Colonel Drives: a slow 2009 e90 335i Join Date: Jun 2011 Location: Chicago Posts: 2,348 iTrader: (6) Garage List 2009 335i (e90) [2.17]	Sounds like the dealer made a stupid mistake by blocking your waste-gate actuator arm with the v-clamp on the DP's. Check yourself or go back to the dealer...it is an easy fix if that's it. GL __________________ BMWCCA member

09-28-2012, 04:25 AM	#6
enrita Major General Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden Posts: 6,806 iTrader: (0)	you would throw underboost or overboost codes. maybe your car had a flash tune on and now they reflashed to stock. __________________ 07 335i AT - TD St.2 Turbos - COBB (Custom Cobb mapping by http://www.protuningfreaks.com/) - JB4G5 ISO - Okada Coils - NGK 5992 Plugs - E85 Walbro - Injen Intake - Helix IC - Snow Stg. 3 - Stett CP - AR DPs - midpipes 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - Level 10 AT upgrade - Alpina AT Flash

09-27-2012, 03:00 PM	#2
pinky_and_me Second Lieutenant Drives: N54 335xi Join Date: Feb 2011 Location: Cleveland, OH Posts: 231 iTrader: (0)	Most likely the ECU was reset so it has to relearn everything.

09-28-2012, 06:52 AM	#8
bigdaddycane "Her vajine hang like sleeve of wizard..." Drives: 2007 335i Sedan Join Date: Aug 2009 Location: Northern Va Posts: 1,812 iTrader: (29) Garage List 2007 BMW 335 [0.00]	OP, Did your car have a tune prior to the turbo replacement? The dealer could have updated the factory software to the latest version, which a lot of folks do not like. the combination of no aftermarket tune and the new factory software version could make the car feel slow. __________________ JB4\|CP-e\|ITG\|ER\|Forge DVs\|KW V1\|M3 Sways\|BBS CH\|BMS\|

09-28-2012, 11:01 AM	#10
themyst Major General Drives: E90 335i LCI Join Date: Feb 2009 Location: NYC Posts: 6,323 iTrader: (8)	Dyno the car if you need confirmation of the power you're making. Butt dynos are about as accurate as weathermen. __________________ E90 LCI N54 6AT

09-28-2012, 11:41 AM	#11
BobVader First Lieutenant Drives: 335xi sedan 2008 Join Date: Mar 2008 Location: Montreal, Canada Posts: 395 iTrader: (0)	Samething for me 2 years ago. After changing turbo car feel slower...only 12-13psi on my gauge boost...after 2 days all come back normal. Probably ecu adapting... __________________ '08 BMW 335xi // Sedan // Black Sapphire // Sports Package//Mods: JB3 2.0\|Unlocked 18ohm Board\|BMS Meth Kit\|AA Speed Delimiter\|BMS tuning gauge\|UR CL DP \|BMS DCI\|AA Exhaust\|Helix fmic\|CDV\|H&R coilover\| 10mm Spacers H&R on 4 wheels\|Record for XI's on dragtimes.com, 11.768s@118.70Top speed 186,4 mph GPS, vbox 60-130mph at 10.18

09-28-2012, 01:06 PM	#14
BlueLion she likes the flavor...... Drives: A51-E92 Join Date: Nov 2006 Location: Bradenton - FL Posts: 1,601 iTrader: (4) Garage List 2007 BMW 335 [0.50]	i had mine replaced....and the car drives like new __________________ E92 Montego Blue silfa718 ..::STETT CAI\|ADVAN RS\|HPF FMIC\|MS DP\|VANGUARD\|PROCEDE\|FORGE DV\|BMS OCC\|KWV2\|MICHELIN PSS\|OOS::..

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