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Thread: Got something pretty special in the works

              
   
  1. #76
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    What materials are the actual turbine made of though? Some sort of superalloy probably. I'd expect the turbine to fail before the housing.
    Last edited by Bleep; 12-31-2011 at 04:02 PM.

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    Yeah, I think it's the Mar-M-247 alloy that's used to reach the 1050C barrier. I haven't seen any boasting by BMW about the N54 being able to hit that number though. Maybe the M division is a bit more snooty Click here to enlarge

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    Did a few pulls stock tune and here's the results:

    3rd gear cruise 2000rpm = 1100F
    3rd gear holding 2500rpm = 1150F
    3rd gear holding 3500rpm = 1250F
    3rd gear holding 4000rpm = 1300F

    3rd gear pull 3k rpm to redline = 1550-1570F
    4th gear pull 3k rpm to redline = 1650F

    Ambient temp: 0C (32F)

    Given this is stock tuning, the N54 seems to be just a hotter running engine than typical...comparing this to recent (above) Cobb stage 2 EGTs their temps go to ~100F hotter while boosting 14.5-15psi on my car with RB turbos...

    Interesting results so far...I'll try to see how a jb4 map2 compares when I get a chance next...this is all pump 94 gas, no meth

    What i also found very interesting was that the EGTs drop VERY fast after going back to cruising after a long pull..literally 2-3secs after letting off at redline the temps stabilize again at 1100F

    Also both banks are showing EGTs with 10-30F of each other always so EGT wise bank2 isn't running noticeably hotter, at least not in these tests, than bank1 which is also pretty nice
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  5. #79
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    Why do you think it's so interesting that the EGTs drop so fast? I'd definitely assume that would happens since the boost drops immediately and you're running much less fuel combusting -> less heat. It's not like there's any heat soak deal going on like with intercoolers.

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    Good info. want this post over on e90 or are we saying $#@! it?

  7. #81
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    Click here to enlarge Originally Posted by Bleep Click here to enlarge
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    Why do you think it's so interesting that the EGTs drop so fast? I'd definitely assume that would happens since the boost drops immediately and you're running much less fuel combusting -> less heat. It's not like there's any heat soak deal going on like with intercoolers.
    I guess seeing temps drop 5-600F in a matter of 2-3secs was just exciting to see...everything I see first hand engine related is interesting to me Click here to enlarge I know there's no heat soak there lol

    Click here to enlarge Originally Posted by mithiral67 Click here to enlarge
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    Good info. want this post over on e90 or are we saying $#@! it?
    Nah man, fcuk em...That forum will never have any constructive feedback...I'm back on there Feb 2nd and if anything I'll be in the regional classifieds section
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    Keep up the good work Dzenno, the info you are providing is gold Click here to enlarge

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    Good stuff man. Cant wait for the meth runs too.

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    Good to see the consistency between bank 1 and 2. It's really a drag when engineering deficiencies lead to a wider range of temps.

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    i had more like 100F difference between bank 1 and 2 , this on hotter temps past summer and much higher boost like 16-17 psi
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  12. #86
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    Your EGT probes are mounted on the exhaust pipes though after the turbine so it's possible there's deviation there for some reason..mine are literally the same location on both turbo manifolds..top middle of the manifold
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    Yeah all bets are off post turbine. Dzennos are pretty ideal I'd say.

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    This is fairly consistent with what I am seeing on my P3 Gauge. I do see an average (I think) of the two EGT values, but this is pretty accurate as to what I am seeing as well.
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    Click here to enlarge Originally Posted by vasillalov Click here to enlarge
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    This is fairly consistent with what I am seeing on my P3 Gauge. I do see an average (I think) of the two EGT values, but this is pretty accurate as to what I am seeing as well.
    I have the p3 gauge and EGTs at idle and throttle tip in will be very close...however if you do a long 3rd or 4th gear pull you'll never see temps on the p3 gauge (off the obd2 port) go close to what they actually are at the manifold...as far as i remember highest I saw was temps in the 1300s...
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    Click here to enlarge Originally Posted by dzenno Click here to enlarge
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    Just some preliminary data that I caught off the iPhone screen...this was on cobb stage 2 aggressive (not stage 2+), boost hits 14.1-14.3psi max down low, timing to about 9-10deg up top, back to back 4th gear pulls from 3k-7k rpm...

    Cruising EGT: 1000-1100F
    5 min idle EGT: 660F
    7k rpm EGT after a 4th gear pull: ramps up to 1750F

    It was interesting to watch the p3 vent gauge that shows EGT from canbus as well and confirms that the temp on the canbus is truly modeled and incorrect...at idle and cruise and throttle tipin it's actually within 50-100F...however at redline after a long 4th gear pull the p3 egt was showing ~1350F while AEM's pre-turbine EGT probes showed 1700+F, so 400F off up top for the canbus provided temp...

    I'll be hooking up the USB cable to the aem box so I can actually log these to my laptop when I get a chance
    If the car is using the 02 sensors to get the EGT readings then I can see it being 3-400 degrees lower than inside the manifold. The turbo is a big heatsink and the car will lose some temperature as it uses the exhaust energy to spin the turbine....average readings before and after the turbine can vary anywhere from 200-400 degrees.

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    Click here to enlarge Originally Posted by Matt@Camber-Toe Click here to enlarge
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    If the car is using the 02 sensors to get the EGT readings then I can see it being 3-400 degrees lower than inside the manifold. The turbo is a big heatsink and the car will lose some temperature as it uses the exhaust energy to spin the turbine....average readings before and after the turbine can vary anywhere from 200-400 degrees.
    Enrita has these same probes mounted after the turbine and his temps are much closer than the obd2 temps...EGTs can be easily and accurately modeled when you know VE, load, spark and injection timing and that's what the dme is outputting...there are no temp probes in the o2 sensors given data off of obd2, enrita's post turbine temp readings and this data
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    Did you ever test with meth and the other tunes or did you start another thread for those?

    bumping this to the top so that we can keep it all in one thread when you test with E85 EGT temps.


    T

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    This may be a stupid question, But what kind of tune is a COBB stage 3? I know they have stage 1 and 2. But never saw stage 3. What kind of tune is stage 3?

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    Click here to enlarge Originally Posted by woptang22 Click here to enlarge
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    This may be a stupid question, But what kind of tune is a COBB stage 3? I know they have stage 1 and 2. But never saw stage 3. What kind of tune is stage 3?
    Upgraded turbos.
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    Less taper to redline. My stage 3 pump was 190 load across.
    07 335i AT - TD St.2 Turbos - COBB (Custom Cobb mapping by http://www.protuningfreaks.com/) - JB4G5 ISO - Okada Coils - NGK 5992 Plugs - E85 Walbro - Injen Intake - Helix IC - Snow Stg. 3 - Stett CP - AR DPs - 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 - Alpina B3 Flash
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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
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    I have the p3 gauge and EGTs at idle and throttle tip in will be very close...however if you do a long 3rd or 4th gear pull you'll never see temps on the p3 gauge (off the obd2 port) go close to what they actually are at the manifold...as far as i remember highest I saw was temps in the 1300s...

    Sorry to comment on an older post, but yes, I do see temps upwards of 1300 F when I romp on the gas with the P3 gauge.
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    IIRC thats the max the guage can read, but I vaguely recall seeing BT logs a bit higher?

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    Its actually just a modeled/calculated value that the dme has, stock car doesn't have EGT probes
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    Wifi/Bluetooth connection with the phone from my experience sucks because it lags a bit, but it is a cool feature

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
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    Its actually just a modeled/calculated value that the dme has, stock car doesn't have EGT probes
    I'm pretty sure the EGT is calculated using the wideband O2 sensor's heater current and voltage..

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