Cobb AP Stg1 w/ alarmingly high boost?

kenop · 09-05-2012, 01:39 PM

Just installed my AP and loaded Stage 1 ST Aggressive.

For some reason when I go through the accessport and check current flash, it says Stage 1 ST Sport. I'll reflash tonight and see if I just picked the wrong one by accident.

When running the Boost monitor and doing a couple of pulls I noticed it regularly surging up to 17/18+ psi, peaking at 18.8 on a near WOT pull.

The car doesn't FEEL like it's running that much, and surely it's too much for a stock N54 from what I read around the board... so what gives? isn't that boost monitor supposed to be very accurate?

What peak boost should I expect to see for Stage 1 Aggressive w/ no other mods?

Using v4.01 map.

Jeff@TopGearSolutions · 09-05-2012, 01:46 PM

You need to do a real log. That boost may be inflated because of throttle closure or boost spikes during a shift. The car will not "overboost".

15-17 PSI Tapering to 12-13 by redline is normal.

enrita · 09-05-2012, 02:36 PM

you need to log, than you will realize how the boost looks like. you are probably the 50th person coming out with the same thread.

King mode · 09-05-2012, 02:47 PM

^^^ what he said.

VNeBLOB42 · 09-05-2012, 02:52 PM

read this, it helps to understand logging, and how to read your results.

http://www.e90post.com/forums/showthread.php?t=696472

kenop · 09-05-2012, 03:18 PM

Quote:

Originally Posted by VNeBLOB42

read this, it helps to understand logging, and how to read your results.

http://www.e90post.com/forums/showthread.php?t=696472

thanks for that. I will do logging and come back with my results...

I was just worried that I'm gonna blow the thing up w/ readings in the 18's.

VNeBLOB42 · 09-05-2012, 05:30 PM

Quote:

Originally Posted by kenop

thanks for that. I will do logging and come back with my results...

I was just worried that I'm gonna blow the thing up w/ readings in the 18's.

Nah, I believe S2+ goes to 18 psi.

kenop · 09-06-2012, 01:06 AM

want to do the logging, but currently afraid to even do a log pull as it peaks at actually over 20psi (when looking at Live monitor - Boost psi).. this is STAGE 1 with ZERO mods other than the AP, why is boost showing so high?

enrita · 09-06-2012, 01:18 AM

Quote:

Originally Posted by kenop

want to do the logging, but currently afraid to even do a log pull as it peaks at actually over 20psi (when looking at Live monitor - Boost psi).. this is STAGE 1 with ZERO mods other than the AP, why is boost showing so high?

dont worry... thats peak boost for a fraction or on gear change, try searching for logs on cobb stage 1 and you will see the boost curve...

09-05-2012, 01:39 PM	#1
kenop Private 0 Rep 75 Posts Drives: 09 E93 335i - Monaco Blue Join Date: Aug 2012 Location: DC iTrader: (0)	Cobb AP Stg1 w/ alarmingly high boost? Just installed my AP and loaded Stage 1 ST Aggressive. For some reason when I go through the accessport and check current flash, it says Stage 1 ST Sport. I'll reflash tonight and see if I just picked the wrong one by accident. When running the Boost monitor and doing a couple of pulls I noticed it regularly surging up to 17/18+ psi, peaking at 18.8 on a near WOT pull. The car doesn't FEEL like it's running that much, and surely it's too much for a stock N54 from what I read around the board... so what gives? isn't that boost monitor supposed to be very accurate? What peak boost should I expect to see for Stage 1 Aggressive w/ no other mods? Using v4.01 map. __________________ "Morrigan" - '09 E93 Monaco Blue Imaginary Mods: Cobb AP \| Smoked Tails \| Black Grilles \| Dolphin Grey AG M310's
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09-05-2012, 01:46 PM	#2
Jeff@TopGearSolutions 3441 Rep 79,212 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	You need to do a real log. That boost may be inflated because of throttle closure or boost spikes during a shift. The car will not "overboost". 15-17 PSI Tapering to 12-13 by redline is normal.
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09-05-2012, 02:36 PM	#3
enrita Major General 159 Rep 7,378 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	you need to log, than you will realize how the boost looks like. you are probably the 50th person coming out with the same thread. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 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 - LUX H8 - Level 10 AT upgrade
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09-05-2012, 02:47 PM	#4
King mode First Lieutenant 8 Rep 374 Posts Drives: 335xi Join Date: May 2012 Location: Denver iTrader: (0)	^^^ what he said. __________________ 2008 335xi AT Cobb AP stage 1, drop in filter, the rest stock 13.10@106.01 w/ 1.86 60' (5,800' altitude)
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09-05-2012, 02:52 PM	#5
VNeBLOB42 Lieutenant Colonel 50 Rep 1,677 Posts Drives: 14' GMC Terrain SLT-2 Join Date: May 2011 Location: Folsom, Ca iTrader: (0) Garage List 007 335i E92 [7.66]	read this, it helps to understand logging, and how to read your results. http://www.e90post.com/forums/showthread.php?t=696472 __________________ SOLD:: PTF Pro eTune by Dzenno / COBB S1+ E50 Alpina B3 Flash / ETS FMIC / ER CP / CPE DCI
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09-06-2012, 01:06 AM	#8
kenop Private 0 Rep 75 Posts Drives: 09 E93 335i - Monaco Blue Join Date: Aug 2012 Location: DC iTrader: (0)	want to do the logging, but currently afraid to even do a log pull as it peaks at actually over 20psi (when looking at Live monitor - Boost psi).. this is STAGE 1 with ZERO mods other than the AP, why is boost showing so high? __________________ "Morrigan" - '09 E93 Monaco Blue Imaginary Mods: Cobb AP \| Smoked Tails \| Black Grilles \| Dolphin Grey AG M310's
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