08-21-2011, 08:12 PM | #23 |
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There is no good reason to know exact boost outside of troubleshooting with the n54, the DME will control boost depending on a wide variety of conditions. You could hit 12psi and then 14psi back to back runs and make the same power due to timing, cam position, etc.
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08-27-2011, 09:06 PM | #25 |
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I'll slap back my P3 boost gauge (version 1, which I kept from the 135i) and report back some time soon, curious myself.
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08-27-2011, 11:01 PM | #26 |
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08-28-2011, 02:15 AM | #27 | |
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Its as pertinent a gauge in any forced induced car as your gas gauge is. AFR/Boost/EGT/Oil press/Oil temp are all pertinent in a boosted car, even more so if you track and are planning on modding anything to raise the boost levels. |
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08-28-2011, 02:18 PM | #28 | |
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On the other hand, boost/exhaust gas temp/oil pressure/oil temp are indeed crucial, and such gauges do a great job at displaying real time values. |
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08-28-2011, 04:17 PM | #30 | |
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12 lbs of boost on your VR4 or SRT4 running 10.1 compression on 91 Octane gas would not have been pretty. That is the reason boost in now controlled more carefully than before. The motors are running leaner, higher compression and higher revs. |
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08-28-2011, 04:59 PM | #31 | |
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Most people talk about boost without taking into consideration what you explained above (compression ratio), and very importantly, size of the turbo(s). Lower boost with a large turbo may easily translate to much more power than higher boost with a smaller turbo - here we enter the subject of cfm's. |
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08-28-2011, 08:10 PM | #32 |
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Can't use a generic obd gauge to read boost on the n54... The map sensor on the manifold of the n54 is only good for 3.3psi or so... the 17 you see is not subtracting ambient pressure of 14.5(or so).... The T-map sensor before the throttle measure up to 22psi, the ECU reads both these and does a blend of the data.
On the n54 it's best to use a vacuum driven sensor (which is what we use for the p3cars.com gauge for the n54 and 1M)... otherwise you won't see vacuum and the throttle plate will create spikes to the sensor that are never seen in the manifold... makes for crappy peak recall! The n55 on the other hand has a 22psi capable sensor on the manifold so obd data will show actual full boost. We've sold a few gauges to 1M users... I am assuming they have been running them and should be able to report back actual boost,egt,coolant temp,AIT,0-60 times, etc... all the stuff the P3 gauge reads. -Rick |
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08-28-2011, 08:56 PM | #33 | |
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08-29-2011, 04:18 PM | #34 | |
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We have a v2 trade-up credit available where we refund some money back to you if you send us your old gauge. Contact us at contact@p3cars.com for details. |
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09-11-2011, 07:00 PM | #35 | |
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03-08-2012, 07:31 PM | #36 | |
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I'm pretty sure not all n55 engines have a 22 psi sensor, as mine won't give a reading over 3.0x psi. |
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03-08-2012, 10:02 PM | #37 | |
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Stock boost is .8 bar, which is 14.7 x .8 = 11.6psi normal boost. Overboost is rated at 1 bar or 14.7 psi. Stock pressure on the non M N54 is 8.7psi. The JB+ at "max" setting gives the N54 up to +4.75psi. At the "max" setting boost should be about 13.45psi. On an 09 135i, we had a JB+ set to near "max". Using a 'hijack' program, we hijacked the fuel gauge to be a turbo boost gauge. The setting was near max, not all the way, and we were seeing a bit over 12psi at full boost. This is not overboost, it was "normal" with that setting. Burger tuning claims that with the JB+ set to "max", real RWHP gains BT claims that at a +2.75 setting, RWHP is +40hp and +50lb ft. My guess is that non wheel power is about 340hp and 350lb ft, which is close to the 1M's stock power output. Max setting is capable of up to +60hp at the wheels. I think that's a bit optimistic but I can tell you that at near max setting the power difference is substantial, not just noticeable, but substantial. Driveability was very OEM like, which was very surprising for such a simple piggyback device. Realistically, I think the setting we used gave us about about +3.75, which accounts for the boost reading showing something like 12.5psi. I can't be accurate on that because when you hijack the gas gauge you only have 4 hash marks by which to judge, so some estimation has to happen. N54 compression ratio is 10.2:1, which is quite high for a turbo enigne, but that's what we can have thanks to direct injection and it's cooling effect on the combustion chamber. Nice. The 1M's N54 compression ratio is also 10.2:1 same as the non M engine. Increased power for the 1M is coming from tuning, not from added compression, just for data point. The turbo's used in both versions of N54 are Mitsubishi TD03, very small little buggers. They can be modded with a different compressor wheel that will allow a greater air flow and the turbines can be clipped helping reduce back pressure and giving a bit better flow at higher rpm. Back to the TD03 turbo's, the 1M N54 also uses the same manifold and turbo's as the non M N54. Part numbers: N54 135i: 11657593015 & 11657593017 N54 1M: 11657593015 & 11657593017 These little turbo's spool quickly and they are ideal for a power curve that has big torque at low rpm. But, they run out of flow capacity as engine speed and turbine speed increase. That's why our engines just don't pull very hard at higher rpm. Clipping would help that a bit. A larger turbo would help that quite a bit, but lag would markedly increase. Some of the 1M engine internals were beefed up to have good long life while under a 50K mile warranty. That's also a bonus for 1M drivers who want a tune as the 1M engine has the advantage of beefier internals, and bodes well for using larger turbo's. Last edited by RPM90; 03-09-2012 at 08:03 PM.. |
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05-06-2012, 01:05 PM | #38 | |
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05-06-2012, 02:55 PM | #39 |
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i can second RPM90's findings in doing my own research
looks like stock boost is 11.6 PSI and overboost puts the car at 14.5 PSI |
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05-06-2012, 08:51 PM | #40 | |
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All other variables held equal, a port and polish or any other work that improved flow through the intake valves into the cylinders would decrease boost pressure and increase horsepower. |
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05-07-2012, 09:14 PM | #42 |
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Stock-wise, my P3 gauge would register high 14s regularly.
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