Cobb V3 turbo spikes at?

jk315 · 02-22-2015, 06:05 PM

Hey guys quick ?....I've had my 335i tuned on the Cobb v3 aggressive for about 6 months now. Question is I used to spike at like 14 or 15 psi when looking at the turbo gauge now seems like I can't get it over 13 or so ....any reasoning behind this just curiosity. ..I'm all stock motor wise...car still is fast just wondering if needed to reprogram it again . Thanks !

galahad05 · 02-22-2015, 06:06 PM

Maybe you have a boost leak? Take a close look at your charge pipe--connectors loose or completely off, or cracked pipe.

What kind of boost gauge you running?

jk315 · 02-22-2015, 06:17 PM

Guess I'll have to search and find out where the charge pipe is even located lol....I'm just reading it off the cobb v3 Accessport where it has the gauges .

galahad05 · 02-22-2015, 06:18 PM

Heh, let me see if I can dig up a picture. Too lazy to go out to the garage and take a pic of my car's engine bay....

galahad05 · 02-22-2015, 06:26 PM

Okay, I can't believe it's so difficult to find a (good) pic online for this.

Try this youtube vid.

55 seconds in, the metal plate at the bottom of the item he's taking out of the engine bay is the throttle plate--the charge pipe connects to that.

Call it.... about 1/3rd down the engine on the drivers side.

jk315 · 02-22-2015, 06:36 PM

Thanks man....yeah I mean if it cracked or the stock one went bad wouldn't the boost go really down....? Is that why everyone upgrades before the stock one breaks if their tuned....?

galahad05 · 02-22-2015, 06:54 PM

Usually yes. In fact often you'll see a boost pressure error.

Maybe you have some misfiring?

mike5809 · 02-22-2015, 07:40 PM

Take a log and post.

If its just 1 or so PSI lower I doubt a leak. It could be due to many things, even the cold weather.

weehe126 · 02-22-2015, 08:46 PM

Cobb targets load, not psi like the JB4. This means you will hit less psi in colder conditions and more in hotter conditions.

galahad05 · 02-23-2015, 12:02 AM

Quote:

Originally Posted by weehe126

Cobb targets load, not psi like the JB4. This means you will hit less psi in colder conditions and more in hotter conditions.

That is interesting! Thanks for that..

kevinbahnz · 02-23-2015, 11:21 AM

that's funny, i have an older AP and mine spikes at 19psi. FBO minus exhaust.

mike5809 · 02-23-2015, 11:22 AM

Quote:

Originally Posted by kevinbahnz

that's funny, i have an older AP and mine spikes at 19psi. FBO minus exhaust.

OP is probably running Stage 1 as he is stock whereas you are probably running Stage 2 being FBO.

Antoniogaj · 02-23-2015, 12:22 PM

Same is happening to me. Maybe it's the -20° windchill lol

jk315 · 02-24-2015, 01:21 PM

Yeah im in south Carolina tho and it's been like 30-50 here everyday not that cold....just wanted to chime in and see why there is like a 2lb loss in psi it used to get red on the boost meter and kinda sparkle and blink when it got to boost max I think highest I saw it was 15.9 or 16.0 now I can't get it over 13.7 or so

02-22-2015, 06:05 PM	#1
jk315 Second Lieutenant 41 Rep 232 Posts Drives: 2008 335i Crimson Red MT Join Date: Aug 2014 Location: Charleston,SC iTrader: (3)	Cobb V3 turbo spikes at? Hey guys quick ?....I've had my 335i tuned on the Cobb v3 aggressive for about 6 months now. Question is I used to spike at like 14 or 15 psi when looking at the turbo gauge now seems like I can't get it over 13 or so ....any reasoning behind this just curiosity. ..I'm all stock motor wise...car still is fast just wondering if needed to reprogram it again . Thanks !
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02-22-2015, 06:06 PM	#2
galahad05 Brigadier General 158 Rep 3,158 Posts Drives: '07 335i e90 Join Date: Mar 2008 Location: Long Island NY iTrader: (0)	Maybe you have a boost leak? Take a close look at your charge pipe--connectors loose or completely off, or cracked pipe. What kind of boost gauge you running? __________________ Always do right. This will gratify some people and astonish the rest. --Mark Twain
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02-22-2015, 06:17 PM	#3
jk315 Second Lieutenant 41 Rep 232 Posts Drives: 2008 335i Crimson Red MT Join Date: Aug 2014 Location: Charleston,SC iTrader: (3)	Guess I'll have to search and find out where the charge pipe is even located lol....I'm just reading it off the cobb v3 Accessport where it has the gauges .
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02-22-2015, 06:18 PM	#4
galahad05 Brigadier General 158 Rep 3,158 Posts Drives: '07 335i e90 Join Date: Mar 2008 Location: Long Island NY iTrader: (0)	Heh, let me see if I can dig up a picture. Too lazy to go out to the garage and take a pic of my car's engine bay.... __________________ Always do right. This will gratify some people and astonish the rest. --Mark Twain
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02-22-2015, 06:26 PM	#5
galahad05 Brigadier General 158 Rep 3,158 Posts Drives: '07 335i e90 Join Date: Mar 2008 Location: Long Island NY iTrader: (0)	Okay, I can't believe it's so difficult to find a (good) pic online for this. Try this youtube vid. 55 seconds in, the metal plate at the bottom of the item he's taking out of the engine bay is the throttle plate--the charge pipe connects to that. Call it.... about 1/3rd down the engine on the drivers side. __________________ Always do right. This will gratify some people and astonish the rest. --Mark Twain
	Appreciate 0 Quote

02-22-2015, 06:36 PM	#6
jk315 Second Lieutenant 41 Rep 232 Posts Drives: 2008 335i Crimson Red MT Join Date: Aug 2014 Location: Charleston,SC iTrader: (3)	Thanks man....yeah I mean if it cracked or the stock one went bad wouldn't the boost go really down....? Is that why everyone upgrades before the stock one breaks if their tuned....?
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02-22-2015, 06:54 PM	#7
galahad05 Brigadier General 158 Rep 3,158 Posts Drives: '07 335i e90 Join Date: Mar 2008 Location: Long Island NY iTrader: (0)	Usually yes. In fact often you'll see a boost pressure error. Maybe you have some misfiring? __________________ Always do right. This will gratify some people and astonish the rest. --Mark Twain
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02-22-2015, 07:40 PM	#8
mike5809 Major 131 Rep 1,086 Posts Drives: '11 335i M-Sport [LeMans Blue] Join Date: May 2011 Location: York, PA iTrader: (7) Garage List 2011 BMW 335i M-Spo ... [9.66]	Take a log and post. If its just 1 or so PSI lower I doubt a leak. It could be due to many things, even the cold weather.
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02-22-2015, 08:46 PM	#9
weehe126 Brigadier General 1161 Rep 3,189 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	Cobb targets load, not psi like the JB4. This means you will hit less psi in colder conditions and more in hotter conditions.
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02-23-2015, 11:21 AM	#11
kevinbahnz Captain 157 Rep 709 Posts Drives: 2008 335xi sedan Join Date: Aug 2008 Location: Ma-NC iTrader: (1)	that's funny, i have an older AP and mine spikes at 19psi. FBO minus exhaust. __________________
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02-23-2015, 12:22 PM	#13
Antoniogaj First Lieutenant 48 Rep 342 Posts Drives: F82 M4 Join Date: Sep 2013 Location: Macomb, Michigan iTrader: (1)	Same is happening to me. Maybe it's the -20° windchill lol
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02-24-2015, 01:21 PM	#14
jk315 Second Lieutenant 41 Rep 232 Posts Drives: 2008 335i Crimson Red MT Join Date: Aug 2014 Location: Charleston,SC iTrader: (3)	Yeah im in south Carolina tho and it's been like 30-50 here everyday not that cold....just wanted to chime in and see why there is like a 2lb loss in psi it used to get red on the boost meter and kinda sparkle and blink when it got to boost max I think highest I saw it was 15.9 or 16.0 now I can't get it over 13.7 or so
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