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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > BMW Performance Pack - before and after Dyno readings



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      11-11-2009, 01:18 PM   #1
Welshman
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BMW Performance Pack - before and after Dyno readings

Attached are the dyno readings showing the stock versus the BPP. The stock reading was done a week ago today and the BPP reading was taken today. The stock readings are also attached.

You'll see that peak torque is up by 31 LbFt and comes in at 2,950 rpm compared with 3,285 prpm stock.

Peak power is only up by 10 bhp.

The overlay shows that there is more bhp gain in the middle of the rev band from about 2,500 rpm through to about 4,000 rpm.

The minimal turbo lag in 6th is now almost non existent and overall throttle response is sharper.

With the additional radiator the engine is now running cooler with the oil temperature running about 10 degrees C less than stock.

Was it worth 1,600? Discuss. Overall the car is even more driveable than before - not that I had any particular gripes about the stock performance.

The dyno guy said it was a nice improvement. He also added that BMW tend to be conservative when it comes to quoted power outputs so it was no surprise to him that most cars seem to pump out about 20 Bhp - about 325 Bhp - more than the quoted output.
Attached Images
File Type: pdf BMW335I-777YYC-BPP-OVERLAY.pdf (38.0 KB, 203 views)
File Type: pdf BMW335I-777YYC.pdf (36.5 KB, 136 views)
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      11-11-2009, 01:23 PM   #2
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Thanks. Still up in the air about it even though there are cheaper alternatives for more HP, but if I went the power route I'd probably go for this.
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      11-11-2009, 01:24 PM   #3
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If you're going to keep the car for a while and decide to tune. This option + a tune would be a good choice for improved reliability.
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      11-11-2009, 02:54 PM   #4
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Am I reading it correctly - 7.8 hp gain at the wheels?
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      11-11-2009, 03:41 PM   #5
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seems very low, I didn't dyno mine, but based on my measurements it must be much more.
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      11-11-2009, 03:52 PM   #6
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I'm not sure I understand the dynos?
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      11-11-2009, 04:12 PM   #7
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Quote:
Originally Posted by roadkillrob View Post
Am I reading it correctly - 7.8 hp gain at the wheels?
Yes and no. The RWHP figure is notional because the drag caused by the rear wheels being crimped between two sets of rollers - with two contact parches rather than one - means that the RWHP figure is materially less than would be achieved driving on the road. The drag figure is actual and is added to the RWHP figure to give you HP at the crank.

However the comparison between the two graphs is relatively valid. You can see that at 3,000 rpm there is a 20 Bhp difference but this reduces as the rpm increases.
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      11-11-2009, 05:05 PM   #8
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Quote:
Originally Posted by bmwzimmer View Post
This option + a tune would be a good choice for improved reliability.
Has this been done yet? BMW Perfomance pack + Tune (eg. JB3 or whatever...)
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