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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Could someone kindly explain how boost works



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      04-07-2013, 01:47 PM   #1
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Could someone kindly explain how boost works

I ran some runs today with the PIII gauge and my boost ranged from 11.5 to 13, and at one point I actually hit 13.8.
I assume that's a good thing, but how exactly does this work?
I assume it's how the turbo spools etc.
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      04-07-2013, 03:57 PM   #2
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Not sure what youre asking...
What is boost? or why does it vary?
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      04-07-2013, 05:02 PM   #3
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Thanks Beem! More why it varies.
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      04-07-2013, 05:05 PM   #4
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could be a number of things, a/f ratios, air intake temps, what gear youre in, open/closed loop operations and or knock detection. At times pending on the air intake charge(on cold nights) you can see a couple psi changes, more dense charge better combustion more power. this is common with a IC upgrade.
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      04-07-2013, 05:53 PM   #5
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Ahhh that explains it! I upgraded to a Dinan inter-cooler and oil cooler along with my stage III.
You guys are sharp!
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      04-07-2013, 07:21 PM   #6
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Quote:
Originally Posted by Dark_Knight_335 View Post
I ran some runs today with the PIII gauge and my boost ranged from 11.5 to 13, and at one point I actually hit 13.8.
I assume that's a good thing, but how exactly does this work?
I assume it's how the turbo spools etc.
The "accuracy" of a PIII gauge entirely is dependent on the types of performance modifications are currently in your vehicle. Do you have a tune which interacts with the CAN BUS or ECU? If so, the PIII gauge readout is irrelevant.

So... do you have a piggy-back boost controller tune such as PROcede or JB4?

YES or NO

If YES, the CAN output reading will be skewed from the tune and the ECU software - which leads to an irrelevant reading on the PIII gauge

If NO, then the PIII gauge (plugged into your OBDII port) "should" read fairly accurate. The stock boost for a 335 n55 motor is between 8-11 psi. With minor mechanical modifications you can increase your boost output to as high as 13 psi +/-1 from what I have seen.

hope this helps...
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      04-07-2013, 08:25 PM   #7
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Quote:
Originally Posted by madmanhiker
Quote:
Originally Posted by Dark_Knight_335 View Post
I ran some runs today with the PIII gauge and my boost ranged from 11.5 to 13, and at one point I actually hit 13.8.
I assume that's a good thing, but how exactly does this work?
I assume it's how the turbo spools etc.
The "accuracy" of a PIII gauge entirely is dependent on the types of performance modifications are currently in your vehicle. Do you have a tune which interacts with the CAN BUS or ECU? If so, the PIII gauge readout is irrelevant.

So... do you have a piggy-back boost controller tune such as PROcede or JB4?

YES or NO

If YES, the CAN output reading will be skewed from the tune and the ECU software - which leads to an irrelevant reading on the PIII gauge

If NO, then the PIII gauge (plugged into your OBDII port) "should" read fairly accurate. The stock boost for a 335 n55 motor is between 8-11 psi. With minor mechanical modifications you can increase your boost output to as high as 13 psi +/-1 from what I have seen.

hope this helps...
It does Mad- thanks so much! No piggyback - Dinan stage III with inter-cooler and oil cooler.
I was thrilled to find the config was so deceptively simple (as mentioned in my other thread.)
Pretty impressed hitting 13.8 at one point
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      04-11-2013, 02:40 PM   #8
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Nice info to know. We have the same E93's but different tune. I just have a PPK and PE, and happy with it. With a Dinan tune my rear tires wouldn't last long.LOL

Maybe after the warranty expires in 6yrs/100k miles. I used to trade my cars more often, but now I keep them longer and save some $$$$. My 07 "SuperBee" has 105k+ and still going strong. My E93 is awesome, IMHO, and having a convertible in FL is
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      04-11-2013, 06:01 PM   #9
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Quote:
Originally Posted by WildBee659 View Post
Nice info to know. We have the same E93's but different tune. I just have a PPK and PE, and happy with it. With a Dinan tune my rear tires wouldn't last long.LOL

Maybe after the warranty expires in 6yrs/100k miles. I used to trade my cars more often, but now I keep them longer and save some $$$$. My 07 "SuperBee" has 105k+ and still going strong. My E93 is awesome, IMHO, and having a convertible in FL is
Yep, very cool Bee! Yea, I hear that brother- this one is with me for the long haul, or until the factory warranty is up Oh don't even get me started about my rear tires
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