n55 JB4 Stage 2 vibration?

135iMike · 04-07-2013, 10:03 PM

Hey guys,

My friend had JB Stage 1 in my car for about 5 months, just upgraded to Stage 2 the other day. The car is completely stock other than the Stage 2 box. After installing it, if he put the car in what only seems to be 5th or 6th gear, and floor it at low rpms, let's say around 40mph and 1500-2000 rpms, right as boost builds, it feels like his driveshaft gets a vibration. That's the best I can describe it. Almost sounds like a very mild version of driving over the wake-up strips if you veer out of your lane.

Either way it has raised some concerns of course. If he runs the stock map, it doesn't do it. Is this a slight 'miss' or something perhaps? Any one else encounter this?

Fresh Face · 04-07-2013, 11:08 PM

i get the same thing, in for details.

BEAR-AvHistory · 04-07-2013, 11:15 PM

Expect you should not be lugging the engine in 5th or 6th @ 1500rpm. Look up "lugging the engine" if you don't understand.

135iMike · 04-07-2013, 11:28 PM

Quote:

Originally Posted by BEAR-AvHistory

Expect you should not be lugging the engine in 5th or 6th @ 1500rpm. Look up "lugging the engine" if you don't understand.

I'm aware of what lugging is. I just wouldn't have considered 1500-2000rpms 'lugging' especially in these low-rpm ft/lb cars; as it pulls just fine. Either way, why does it cause a vibration? And why is it only doing it with the tune active? Doesn't seem to add up.

Wibbles · 04-08-2013, 04:12 AM

my N54 did does the same thing, its the extra torque on the drive train causing the vibration. Just change down or apply less throttle till you get past 2000rpms.

Wibbles · 04-08-2013, 04:12 AM

my N54 does the same thing, its the extra torque on the drive train causing the vibration. Just change down or apply less throttle till you get past 2000rpms.

ShocknAwe · 04-08-2013, 06:43 PM

These guys covered it, assuming you're driving a manual of course. Too much torque at too low revs is a bad thing for your drive train.

135iMike · 04-08-2013, 08:33 PM

Quote:

Originally Posted by ShocknAwe

These guys covered it, assuming you're driving a manual of course. Too much torque at too low revs is a bad thing for your drive train.

Word. I happened to change back to my summer tires the day I did the tune (thought I could have knocked something out of balance) so I just wanted to make sure this was 'normal'... Thanks guys.

04-07-2013, 10:03 PM	#1
135iMike Lieutenant 40 Rep 398 Posts Drives: 2012 White 135i Join Date: Apr 2012 Location: United States iTrader: (1)	n55 JB4 Stage 2 vibration? Hey guys, My friend had JB Stage 1 in my car for about 5 months, just upgraded to Stage 2 the other day. The car is completely stock other than the Stage 2 box. After installing it, if he put the car in what only seems to be 5th or 6th gear, and floor it at low rpms, let's say around 40mph and 1500-2000 rpms, right as boost builds, it feels like his driveshaft gets a vibration. That's the best I can describe it. Almost sounds like a very mild version of driving over the wake-up strips if you veer out of your lane. Either way it has raised some concerns of course. If he runs the stock map, it doesn't do it. Is this a slight 'miss' or something perhaps? Any one else encounter this? Last edited by 135iMike; 06-18-2013 at 08:38 AM..
	Appreciate 0 Tweet Quote

04-07-2013, 11:08 PM	#2
Fresh Face Enlisted Member 4 Rep 48 Posts Drives: 2011 Alpine White 135i Join Date: Oct 2012 Location: Chicago iTrader: (1)	i get the same thing, in for details.
	Appreciate 0 Quote

04-07-2013, 11:15 PM	#3
BEAR-AvHistory 2020 Z4 M40i - 2022 M4C Convt 3124 Rep 5,264 Posts Drives: 2020 Z4 M40i - 2022 M4C Convrt Join Date: Jun 2011 Location: Raleigh, NC - OIB, NC iTrader: (0) Garage List 1965 COBRA (FFR rep ... [8.57] 2023 Jeep Wrangler ... [9.50] 2009 Yamaha V-Star [0.00] Cars 2-BMW, 2-FORD, ... [0.00] 2023 Ford Expeditio ... [0.00] 2020 Z4 M40i [10.00] 2022 BMW M4C [7.25] 1998 FORD Ranger 4X4 [0.00]	Expect you should not be lugging the engine in 5th or 6th @ 1500rpm. Look up "lugging the engine" if you don't understand. __________________ Kevin Dravit Gray, Black Leather, Moonlight Roof, Red Calipers 2022 M4C - 2020 Z4 M40i - 2023 FORD Expedition XLT Max 4X4 400BHP - 2009 V-Star - 1998 Ranger 4X4 5MT - 1965 Cobra (R) 5MT - 2023 Jeep Wrangler Sport S 6MT
	Appreciate 0 Quote

04-08-2013, 04:12 AM	#5
Wibbles Coding ECU's remotely 445 Rep 1,171 Posts Drives: M3LR Join Date: May 2012 Location: UK iTrader: (0)	my N54 did does the same thing, its the extra torque on the drive train causing the vibration. Just change down or apply less throttle till you get past 2000rpms. __________________ Author of Car Connector - remote ICOM & ENET tool - Built in VPN for easy coding and remote diagnostics Car Connector on YouTube
	Appreciate 0 Quote

04-08-2013, 04:12 AM	#6
Wibbles Coding ECU's remotely 445 Rep 1,171 Posts Drives: M3LR Join Date: May 2012 Location: UK iTrader: (0)	my N54 does the same thing, its the extra torque on the drive train causing the vibration. Just change down or apply less throttle till you get past 2000rpms. __________________ Author of Car Connector - remote ICOM & ENET tool - Built in VPN for easy coding and remote diagnostics Car Connector on YouTube
	Appreciate 0 Quote

04-08-2013, 06:43 PM	#7
ShocknAwe 1Addict 3228 Rep 7,889 Posts Drives: E82 Mutt, M57 Truck Join Date: Jul 2012 Location: Charleston iTrader: (22)	These guys covered it, assuming you're driving a manual of course. Too much torque at too low revs is a bad thing for your drive train. __________________ 2010 135i 6MT Jet Black N54/3 FE82 Mutt \| BUILD THREAD \| GARAGE SALE
	Appreciate 0 Quote

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search