boost

autodynamics · 11-15-2011, 11:23 AM

Hello,
Is it normal if the boost drop from 18psi at 5000 rpm than to 16psi at 5500 than to13 at 6000 rpm than to10 psi at 6900rpm?the car is fast and smooth.
Thanks

JamesM3M5 · 11-15-2011, 11:33 AM

Yes. What tune/piggyback controller are you using?

autodynamics · 11-15-2011, 12:07 PM

Quote:

Originally Posted by JamesM3M5

Yes. What tune/piggyback controller are you using?

i am running cobb stg2+ with 7"ets ic and 3"decated ar design dp and dci

autodynamics · 11-15-2011, 12:12 PM

Does anyone can post his datalog.

Mr. Nice · 11-15-2011, 12:55 PM

Normal

Jeff@TopGearSolutions · 11-15-2011, 12:56 PM

Yes, normal.

autodynamics · 11-15-2011, 01:01 PM

Thank you

autodynamics · 11-15-2011, 01:42 PM

Does anyone tried to tighten the wastegates,maybe boost will hold better.

Jeff@TopGearSolutions · 11-15-2011, 01:44 PM

Quote:

Originally Posted by autodynamics

Does anyone tried to tighten the wastegates,maybe boost will hold better.

No. It purposely relieves boost on the top end so you dont blow your turbo's. These turbo's cannot support that much boost by redline, they are out of their efficiency range, spinning it XXX,XXX RPM's.

Shift at 6000 RPM and the car will pull much harder.

JamesM3M5 · 11-15-2011, 01:59 PM

Quote:

Originally Posted by Jeff@topgearsolutions

No. It purposely relieves boost on the top end so you dont blow your turbo's. These turbo's cannot support that much boost by redline, they are out of their efficiency range, spinning it XXX,XXX RPM's.

Shift at 6000 RPM and the car will pull much harder.

Aren't they close to / over 200,000 RPM? I thought I read that they can hit nearly 220,000. Not that you'd WANT to run them that hard, of course.

I also shift no higher than 6400 in 3rd, 6000 in all other gears. Hell, who am I kidding. I haven't hit 6000 in 5th or 6th. Yet...

Jeff@TopGearSolutions · 11-15-2011, 02:02 PM

Quote:

Originally Posted by JamesM3M5

Aren't they close to / over 200,000 RPM? I thought I read that they can hit nearly 220,000. Not that you'd WANT to run them that hard, of course.

I also shift no higher than 6400 in 3rd, 6000 in all other gears. Hell, who am I kidding. I haven't hit 6000 in 5th or 6th. Yet...

Its definitely 100,000 +.

18 PSI at 4500 RPM spins the turbos less then like 12 PSI at like 7000 RPM as well.

When you spin the turbo's that hard by redline they are spinning insanely fast. Math is not my forte

I usually shift by 6200.But redline 1st and 2nd.

Bash · 11-15-2011, 03:28 PM

Quote:

Originally Posted by autodynamics

Hello,
Is it normal if the boost drop from 18psi at 5000 rpm than to 16psi at 5500 than to13 at 6000 rpm than to10 psi at 6900rpm?the car is fast and smooth.
Thanks

Cobb reads boost incorrectly over 5k
Use a boost gauge for real boost

11-15-2011, 11:23 AM	#1
autodynamics Private 8 Rep 59 Posts Drives: 335e92.996gt2 switzer P800. Join Date: Oct 2011 Location: beirut,lebanon iTrader: (0)	boost Hello, Is it normal if the boost drop from 18psi at 5000 rpm than to 16psi at 5500 than to13 at 6000 rpm than to10 psi at 6900rpm?the car is fast and smooth. Thanks
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11-15-2011, 11:33 AM	#2
JamesM3M5 Some dude 92 Rep 1,780 Posts Drives: E92 335i Join Date: Sep 2011 Location: Northern VA iTrader: (0)	Yes. What tune/piggyback controller are you using? __________________ RRT E92 335i/6MT with stuff and things
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11-15-2011, 12:12 PM	#4
autodynamics Private 8 Rep 59 Posts Drives: 335e92.996gt2 switzer P800. Join Date: Oct 2011 Location: beirut,lebanon iTrader: (0)	Does anyone can post his datalog.
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11-15-2011, 12:56 PM	#6
Jeff@TopGearSolutions 3442 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Yes, normal.
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11-15-2011, 01:01 PM	#7
autodynamics Private 8 Rep 59 Posts Drives: 335e92.996gt2 switzer P800. Join Date: Oct 2011 Location: beirut,lebanon iTrader: (0)	Thank you
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11-15-2011, 01:42 PM	#8
autodynamics Private 8 Rep 59 Posts Drives: 335e92.996gt2 switzer P800. Join Date: Oct 2011 Location: beirut,lebanon iTrader: (0)	Does anyone tried to tighten the wastegates,maybe boost will hold better.
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