Major Power loss above 4,200rpm

sluflyer06 · 08-30-2011, 10:27 PM

Hi everyone.

2008 135i MT w/ 14K miles. Mods: DCI, JB4, Berk ******* midpipes and axleback. Map 1. Running Mobil 93oct.

Car has run great until 3 days ago when I was getting on the highway WOT in 3rd and somewhere between 4K-5K the car literally stopped accelerating completely and the rpm's hung until I let off the gas it was extremely abrupt. Ever since that incident I've noticed a huge power loss at upper RPM which is consistent at all times any all gears (above 4,500 or so).

I thought I might just be paranoid so I strapped her on the dyno today after work and confirmed what I was feeling.

Map 0:

Map 1:

You can see clearly in the Map 1 dyno the power loss I'm feeling around 4,300 where torque drops off the map and the power never makes it anywhere near it should be. I have no idea what could be going on, I have no CEL or codes. I should also note that Max cool does not do anything on my car when I select the option to enable it....is something wrong with the JB4 maybe? I should also note paying attention to my hijacked boost gauge that boost seems to be fine, its right around 13psi tapering to 10psi up top.

RnmEvo9 · 08-30-2011, 11:11 PM

Did you fill up recently? I would think bad gas might be a possibility...

Andrew@ET · 08-30-2011, 11:17 PM

Max cool mode doesn't work.. did it ever? It may take a little bit to turn on

thebigragu99 · 08-30-2011, 11:50 PM

Quote:

Originally Posted by Andrew@EMSTUNING

Max cool mode doesn't work.. did it ever? It may take a little bit to turn on

Max cool turns on right away!!I was going to say the same thing about the gas ,next I would double check every clamp to see if it's tight or something may have popped off???p.s mobil gas is not the greatest.

Andrew@ET · 08-31-2011, 12:32 AM

Quote:

Originally Posted by thebigragu99

Max cool turns on right away!!I was going to say the same thing about the gas ,next I would double check every clamp to see if it's tight or something may have popped off???p.s mobil gas is not the greatest.

Mine doesn't turn on right away usually takes 15 seconds or so. N55 here though

chachacha28 · 08-31-2011, 01:19 AM

boost leak? a small one might not trip the cel.

thebigragu99 · 08-31-2011, 01:33 AM

Quote:

Originally Posted by Andrew@EMSTUNING

Mine doesn't turn on right away usually takes 15 seconds or so. N55 here though

True that..To the op bellow,a small boost leak would maybe do it,but it Also depends where and how much..My buddy came to my house last week saying that his car felt a bit weak,so I told him to check the clamps if there were loose ..The lower charge pipe from the driver side intercooler wasn't super tight,so I put a socket it and the turned it A full turn till very tight ..He called me 1 hour later stating that his turbo spooled ,hit harder,picked up 2 psi ,and held 13.5 till redline ..Thats a difference if you ask me,so turbo cars are very temperamental ..Every little thing counts on them to have them run tip top!

masetcp · 08-31-2011, 03:32 AM

boost leak test!!!

what does your boost look like? if its falling fast up top.. boost leak

Mr. Nice · 08-31-2011, 07:17 AM

Quote:

Originally Posted by masetcp

boost leak test!!!

what does your boost look like? if its falling fast up top.. boost leak

post a log if you can, it's probably the charge pipe/ diverter valves

BrokenVert · 08-31-2011, 07:27 AM

$10 your chargepipe blew off.

xerox445 · 08-31-2011, 07:32 AM

You have JB4, and a dyno. How about a log?

IMHO....that might give you just a little bit more info then a bunch of people guessing what your problem is over the internet. Just saying.

bmwbrad22 · 08-31-2011, 07:36 AM

if its none of the above.....compression test...

sluflyer06 · 08-31-2011, 08:48 AM

From watching my hijacked fuel>boost gauge, it doesn't seem to drop off really bad, bu ti can't remember what it was like before...

I didn't have access to my usb cable yesterday, I've got it with me at work now and hte cowl is off/etc. Soon as I get done with a couple meetings I"m gonna go makes logs.

sluflyer06 · 08-31-2011, 12:18 PM

Here is a 4th gear log attached to this post.

4th gear.zip

moveswiftly · 08-31-2011, 01:54 PM

Quote:

Originally Posted by BrokenVert

$10 your chargepipe blew off.

he would barely make even stock level power if his chargepipe blew off... thats wayy to big of a leak to make 300 hp.

escobar929 · 08-31-2011, 02:36 PM

i would also think its some sort of leak, look at the AFRs, they get pretty rich around 4.7k-5k and on after. unless the jb4 went bad

sluflyer06 · 08-31-2011, 02:52 PM

11.4-11.8 doesn't seem that rich to me. What are most people seeing for AFR?

stpijb · 08-31-2011, 03:13 PM

Did you try to redue the firmware for the JB4 to make sure it wasnt something with the firmware. I cant see the log either. Get in touch with terry from burger tuning he might be able to help you also.

sluflyer06 · 08-31-2011, 03:36 PM

Terry and I are already communicating with each other on this.

I had thought about going back to my 7/24 firmware to see if that clears anything up. I still can't believe how bad the stock fmic is after looking at the logs, just a 3rd gear pull and seeing a 36% rise in IAT.

1NNO_35 · 08-31-2011, 04:06 PM

I had similar problem.

Found out that my FORGE DV's we're corrupt. Back to stock and works like a train toilet.

Xtian · 08-31-2011, 04:24 PM

when was the last time you changed your points and condenser? I have this problem a lot in my Austin if there's too much carbon build up.

Oh wait, I'm on the 1 series forum.

Never mind.

sluflyer06 · 08-31-2011, 05:50 PM

Quote:

Originally Posted by 1NNO_35

I had similar problem.

Found out that my FORGE DV's we're corrupt. Back to stock and works like a train toilet.

did you have a loss of power like this but logs still showed an ability to reach boost targets?

08-30-2011, 10:27 PM	#1
sluflyer06 Private First Class 6 Rep 170 Posts Drives: 2008 135i MT Join Date: Jul 2011 Location: St. Louis, MO iTrader: (2)	Major Power loss above 4,200rpm - Dyno's Enclosed Hi everyone. 2008 135i MT w/ 14K miles. Mods: DCI, JB4, Berk ******* midpipes and axleback. Map 1. Running Mobil 93oct. Car has run great until 3 days ago when I was getting on the highway WOT in 3rd and somewhere between 4K-5K the car literally stopped accelerating completely and the rpm's hung until I let off the gas it was extremely abrupt. Ever since that incident I've noticed a huge power loss at upper RPM which is consistent at all times any all gears (above 4,500 or so). I thought I might just be paranoid so I strapped her on the dyno today after work and confirmed what I was feeling. Map 0: Map 1: You can see clearly in the Map 1 dyno the power loss I'm feeling around 4,300 where torque drops off the map and the power never makes it anywhere near it should be. I have no idea what could be going on, I have no CEL or codes. I should also note that Max cool does not do anything on my car when I select the option to enable it....is something wrong with the JB4 maybe? I should also note paying attention to my hijacked boost gauge that boost seems to be fine, its right around 13psi tapering to 10psi up top. __________________ 08' 135i MT \|\| Cobb Stage 1 'Aggressive' 4.01 Map \| BMS DCI \| Berk Mid Pipes \| Maddad Eurosport Axleback \| E93 FSB \| M-Sport Black on Black \| CDV Delete \|\|
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08-30-2011, 11:11 PM	#2
RnmEvo9 Banned 247 Rep 1,827 Posts Drives: 2007 335i Join Date: Apr 2011 Location: Pembroke Pines, FL iTrader: (2)	Did you fill up recently? I would think bad gas might be a possibility...
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08-30-2011, 11:17 PM	#3
Andrew@ET Brigadier General 181 Rep 4,038 Posts Drives: Red thing Join Date: May 2007 Location: Earth iTrader: (9)	Max cool mode doesn't work.. did it ever? It may take a little bit to turn on
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08-31-2011, 01:19 AM	#6
chachacha28 NCOIC of Kickin It 78 Rep 946 Posts Drives: 08 135i "Simona" Join Date: Feb 2011 Location: Great Falls MT iTrader: (1)	boost leak? a small one might not trip the cel.
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08-31-2011, 03:32 AM	#8
masetcp Private 4 Rep 58 Posts Drives: evo Join Date: Aug 2011 Location: las vegas iTrader: (1)	boost leak test!!! what does your boost look like? if its falling fast up top.. boost leak
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08-31-2011, 07:27 AM	#10
BrokenVert Resident Kerbalnaut 477 Rep 10,703 Posts Drives: Topless Brute/Hybrid Boogaloo Join Date: Apr 2009 Location: Fahrvergnügen/NY iTrader: (0)	$10 your chargepipe blew off. __________________
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08-31-2011, 07:32 AM	#11
xerox445 Damenslip-Tropfer 23 Rep 543 Posts Drives: 2008 SGM 135i Join Date: May 2011 Location: LBI, NJ iTrader: (1)	You have JB4, and a dyno. How about a log? IMHO....that might give you just a little bit more info then a bunch of people guessing what your problem is over the internet. Just saying.
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08-31-2011, 07:36 AM	#12
bmwbrad22 Lieutenant 249 Rep 535 Posts Drives: 18%E2%80%99 M3 Comp Pkg Join Date: Apr 2011 Location: NJ iTrader: (0) Garage List 2018 BMW F80 M3 [10.00]	if its none of the above.....compression test...
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08-31-2011, 08:48 AM	#13
sluflyer06 Private First Class 6 Rep 170 Posts Drives: 2008 135i MT Join Date: Jul 2011 Location: St. Louis, MO iTrader: (2)	From watching my hijacked fuel>boost gauge, it doesn't seem to drop off really bad, bu ti can't remember what it was like before... I didn't have access to my usb cable yesterday, I've got it with me at work now and hte cowl is off/etc. Soon as I get done with a couple meetings I"m gonna go makes logs. __________________ 08' 135i MT \|\| Cobb Stage 1 'Aggressive' 4.01 Map \| BMS DCI \| Berk Mid Pipes \| Maddad Eurosport Axleback \| E93 FSB \| M-Sport Black on Black \| CDV Delete \|\|
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08-31-2011, 12:18 PM	#14
sluflyer06 Private First Class 6 Rep 170 Posts Drives: 2008 135i MT Join Date: Jul 2011 Location: St. Louis, MO iTrader: (2)	Log Here is a 4th gear log attached to this post. 4th gear.zip __________________ 08' 135i MT \|\| Cobb Stage 1 'Aggressive' 4.01 Map \| BMS DCI \| Berk Mid Pipes \| Maddad Eurosport Axleback \| E93 FSB \| M-Sport Black on Black \| CDV Delete \|\|
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08-31-2011, 02:36 PM	#16
escobar929 Brigadier General 154 Rep 4,528 Posts Drives: M2 CS Join Date: Aug 2009 Location: Hollywood, FL iTrader: (14) Garage List 2020 M2 CS [10.00] 2020 M240i [0.00]	i would also think its some sort of leak, look at the AFRs, they get pretty rich around 4.7k-5k and on after. unless the jb4 went bad
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08-31-2011, 02:52 PM	#17
sluflyer06 Private First Class 6 Rep 170 Posts Drives: 2008 135i MT Join Date: Jul 2011 Location: St. Louis, MO iTrader: (2)	11.4-11.8 doesn't seem that rich to me. What are most people seeing for AFR? __________________ 08' 135i MT \|\| Cobb Stage 1 'Aggressive' 4.01 Map \| BMS DCI \| Berk Mid Pipes \| Maddad Eurosport Axleback \| E93 FSB \| M-Sport Black on Black \| CDV Delete \|\|
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08-31-2011, 03:13 PM	#18
stpijb Banned 3 Rep 73 Posts Drives: 135i Join Date: Aug 2011 Location: El Paso iTrader: (3)	Did you try to redue the firmware for the JB4 to make sure it wasnt something with the firmware. I cant see the log either. Get in touch with terry from burger tuning he might be able to help you also.
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08-31-2011, 03:36 PM	#19
sluflyer06 Private First Class 6 Rep 170 Posts Drives: 2008 135i MT Join Date: Jul 2011 Location: St. Louis, MO iTrader: (2)	Terry and I are already communicating with each other on this. I had thought about going back to my 7/24 firmware to see if that clears anything up. I still can't believe how bad the stock fmic is after looking at the logs, just a 3rd gear pull and seeing a 36% rise in IAT. __________________ 08' 135i MT \|\| Cobb Stage 1 'Aggressive' 4.01 Map \| BMS DCI \| Berk Mid Pipes \| Maddad Eurosport Axleback \| E93 FSB \| M-Sport Black on Black \| CDV Delete \|\|
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08-31-2011, 04:06 PM	#20
1NNO_35 Private 3 Rep 63 Posts Drives: BMW 135i Join Date: Nov 2009 Location: Helsinki, Finland iTrader: (0)	I had similar problem. Found out that my FORGE DV's we're corrupt. Back to stock and works like a train toilet. __________________ Black painted OEM Rims with 225/255 Wheels - aFe Filter - aR Catted Downpipes - Performance Axleback Exhaust - Performance Breaks - Performance Steering Wheel - Performance Shifter - Carbon Fiber Front Grills and Back Diffuser + Back Spoiler ->
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08-31-2011, 04:24 PM	#21
Xtian Illuminated 11 Rep 110 Posts Drives: 135i Join Date: Aug 2011 Location: Brooklyn, NY iTrader: (0)	when was the last time you changed your points and condenser? I have this problem a lot in my Austin if there's too much carbon build up. Oh wait, I'm on the 1 series forum. Never mind.
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