Jb4 with stock bypass on

Akopley · 01-26-2012, 12:55 AM

My car feels unsmooth (jerky is too harsh) upon acceleration in stock bypass mode. Almost like its lunging as I accelerate. map 1 and 2 are smooth as silk. I have dci and dp\'s. Anyone else experienced an almost rhythmic pulling sensation upon acceleration? I can try and get a video tomorrow. Car is 07 e92 with 70k miles. It did not do this with the jb4 out and stock air box. Going to switch out dci with air box tomorrow to see if that\'s the issue. Otherwise I suppose I have something wrong with my engine. Any advice is appreciated.

Beemw335 · 01-26-2012, 01:49 AM

Datalog.

Mike@N54Tuning.com · 01-26-2012, 10:46 AM

On map 0 the JB4 is in bypass mode, so its likely your DME complaining about the downpipes and intake. As long as its running normally on a JB4 map I doubt you have any real issue.

Mike

Akopley · 01-26-2012, 02:11 PM

Terry said my logs were ok but said my waste gates were tight. I'm getting more waste gate rattle since installing dp's. Is the rattle just an annoyance or is it something worth fixing. Could bad spark plugs cause the oscillating, lunging feeling on stock?

Beemw335 · 01-26-2012, 02:13 PM

You hear the rattle more with downpipes.
Post up yours logs and let others give you their opinions.

woodga16 · 01-26-2012, 07:50 PM

Yes, spark plugs can...same problems as you, replaced spark plugs=problem solved.

Akopley · 01-28-2012, 09:23 PM

problem solved...was the spark plugs. car feels like a new beast. how big a difference HP wise could bad plugs have taken away?

MR.Slick1029 · 01-28-2012, 09:29 PM

Quote:

Originally Posted by Akopley

problem solved...was the spark plugs. car feels like a new beast. how big a difference HP wise could bad plugs have taken away?

When the car is misfiring and running really bad, My butt dyno told me about 50hp. Once the car stopped misfiring after spark plugs. it was like i installed the tune for the first time.

335i-boy · 01-29-2012, 08:56 AM

Quote:

Originally Posted by Akopley

problem solved...was the spark plugs. car feels like a new beast. how big a difference HP wise could bad plugs have taken away?

Did you notice what the old plugs looked like? ie carbon build up, electrode degredation?

RnmEvo9 · 01-29-2012, 09:47 AM

Quote:

Originally Posted by Akopley

problem solved...was the spark plugs. car feels like a new beast. how big a difference HP wise could bad plugs have taken away?

It definitely loses about 50+ horsepower like the other guy said. At the end of last year, I went to the drag strip to do a few pulls and generally did high 12's, low 13's all trapping around 112-114mph. During the first week of this year, I went back again and I started misfiring when I did the runs. The times were around the same because I got much better 60fts, however my trap speeds suffered significantly as I misfired at the top of 3rd gear all the time. All my traps this time were around 107-108mph.

I had about 55k on the original plugs and the electrodes were degraded. New plugs transformed the car again into the way it was before.

Akopley · 01-29-2012, 02:22 PM

From bottom up 1-6.

Fred_Boosted · 01-29-2012, 05:15 PM

Quote:

Originally Posted by Akopley

From bottom up 1-6.

Check your coil.

Cylinder 6 does not look good.

Akopley · 01-29-2012, 06:17 PM

I replaced all plugs and it feels much better, but based off that picture you think i should replace coil pack 6? Other than 6 how do they look?

Adam

Akopley · 01-29-2012, 07:41 PM

Yeah there was some oil on them.

WNF_335i · 06-22-2012, 09:27 PM

Im installing the JB4 and DCI in tomorrow. I already got around 96k on the car. Within the next few days im going to change the plugs just to be on the safe side

gzim335 · 06-23-2012, 07:49 PM

Quote:

Originally Posted by Akopley

From bottom up 1-6.

number 6 looked oily too when i replaced mine at 41k due to misfire

boostaholic786 · 06-23-2012, 10:05 PM

80% of them are in pretty damn good condition for being that many miles on them...

Chrisred · 06-24-2012, 10:37 AM

Did u get any residue around hole where plug goes in?? Mine were worst than yours. I changed all coils and plugs same time.

benzy89 · 06-24-2012, 11:50 AM

Quote:

Originally Posted by Akopley

Yeah there was some oil on them.

Consider a replacement Valve Cover Gasket (#11127565286). I was getting misfires, replaced my spark plugs & my #3 plug was in similar condition: slight coating in oil, but not dripping (which would indicate a very bad leak). My mechanic recommended the replacement gasket.

I'm going to have my intake valves blasted next month & will be replacing the gasket at the same time to avoid getting hammered with additional (and unnecessary) service hours.

As for Ignition Coils, IMO it makes the most sense to replace all 6 at the same time (and the same w/ spark plugs) since after one fails, the others will follow shortly.

01-26-2012, 12:55 AM	#1
Akopley Second Lieutenant 13 Rep 210 Posts Drives: 335i coupe Join Date: May 2011 Location: Atlanta iTrader: (3)	Jb4 with stock bypass on My car feels unsmooth (jerky is too harsh) upon acceleration in stock bypass mode. Almost like its lunging as I accelerate. map 1 and 2 are smooth as silk. I have dci and dp\'s. Anyone else experienced an almost rhythmic pulling sensation upon acceleration? I can try and get a video tomorrow. Car is 07 e92 with 70k miles. It did not do this with the jb4 out and stock air box. Going to switch out dci with air box tomorrow to see if that\'s the issue. Otherwise I suppose I have something wrong with my engine. Any advice is appreciated.
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01-26-2012, 01:49 AM	#2
Beemw335 Colonel 62 Rep 2,013 Posts Drives: 335i Join Date: Mar 2011 Location: My car is my home iTrader: (2)	Datalog.
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01-26-2012, 10:46 AM	#3
Mike@N54Tuning.com Joint Chiefs of Staff 4918 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	On map 0 the JB4 is in bypass mode, so its likely your DME complaining about the downpipes and intake. As long as its running normally on a JB4 map I doubt you have any real issue. Mike Last edited by Mike@N54Tuning.com; 01-26-2012 at 10:55 AM..
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01-26-2012, 02:11 PM	#4
Akopley Second Lieutenant 13 Rep 210 Posts Drives: 335i coupe Join Date: May 2011 Location: Atlanta iTrader: (3)	Terry said my logs were ok but said my waste gates were tight. I'm getting more waste gate rattle since installing dp's. Is the rattle just an annoyance or is it something worth fixing. Could bad spark plugs cause the oscillating, lunging feeling on stock?
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01-26-2012, 02:13 PM	#5
Beemw335 Colonel 62 Rep 2,013 Posts Drives: 335i Join Date: Mar 2011 Location: My car is my home iTrader: (2)	You hear the rattle more with downpipes. Post up yours logs and let others give you their opinions.
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01-26-2012, 07:50 PM	#6
woodga16 First Lieutenant 16 Rep 378 Posts Drives: BMW 335i Join Date: Mar 2011 Location: US iTrader: (0)	Yes, spark plugs can...same problems as you, replaced spark plugs=problem solved.
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01-28-2012, 09:23 PM	#7
Akopley Second Lieutenant 13 Rep 210 Posts Drives: 335i coupe Join Date: May 2011 Location: Atlanta iTrader: (3)	problem solved...was the spark plugs. car feels like a new beast. how big a difference HP wise could bad plugs have taken away?
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01-29-2012, 02:22 PM	#11
Akopley Second Lieutenant 13 Rep 210 Posts Drives: 335i coupe Join Date: May 2011 Location: Atlanta iTrader: (3)	From bottom up 1-6.
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01-29-2012, 06:17 PM	#13
Akopley Second Lieutenant 13 Rep 210 Posts Drives: 335i coupe Join Date: May 2011 Location: Atlanta iTrader: (3)	I replaced all plugs and it feels much better, but based off that picture you think i should replace coil pack 6? Other than 6 how do they look? Adam
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01-29-2012, 07:41 PM	#14
Akopley Second Lieutenant 13 Rep 210 Posts Drives: 335i coupe Join Date: May 2011 Location: Atlanta iTrader: (3)	Yeah there was some oil on them.
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06-22-2012, 09:27 PM	#15
WNF_335i Private First Class 6 Rep 120 Posts Drives: E90 335i 6MT Join Date: Mar 2012 Location: Brampton/Toronto iTrader: (1)	Im installing the JB4 and DCI in tomorrow. I already got around 96k on the car. Within the next few days im going to change the plugs just to be on the safe side
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06-23-2012, 10:05 PM	#17
boostaholic786 Captain 40 Rep 623 Posts Drives: E92 N54 with MHD Custom flash Join Date: Dec 2011 Location: Plano TX iTrader: (0)	80% of them are in pretty damn good condition for being that many miles on them... __________________ [SIZE="2"]Crimson Red E92 335i M-sport 6-speed with MHD custom stage 2+ flash only , 40% E85/93 mix,+ HRE P40S wheels, KW Clubsport, M3 sways,+BMW performance CF Mirrors, BMW Performance CF deck lid spoiler,+ CF interior trim, p3 vent boost gauge,+ LUX angel eyes (11.73@124mph on street tires)
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06-24-2012, 10:37 AM	#18
Chrisred Captain 63 Rep 788 Posts Drives: BMW 335xi coupe Join Date: Jan 2010 Location: Montreal, Canada iTrader: (0)	Did u get any residue around hole where plug goes in?? Mine were worst than yours. I changed all coils and plugs same time. __________________ JB4 Trebila tuned cp-e IC AMS exhaust BMS DCI AR DP's METH RB TURBO 19" VMR VB3 Stoptech BBK TC KLINE VORSHLAG SPEC STG 3 OSS design
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