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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 > ***N55 Dyno Vishnu Procede and Vishnu Downpipe Combo***



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      04-27-2011, 01:16 PM   #23
htt760
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Quote:
Originally Posted by themyst View Post
The challenge is with the n55 that single turbo can only make so much power top end. U could crank the boost to 16-17 psi, u won't see any improvement top end. Sorta like how n54 is maxed out around 380-385 whp at redline spinning the hell out of the turbos.

All the gains achieved from cranking the boost on either engine is in the midrange up to around 6000 rpm tops.
This is very correct, if we look at the dyno graph and see that power starts tapering at around 5600 rpm's to 6000 rpms... so its not even worth taking the car up to redline for the N55

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Originally Posted by Juiced46 View Post
You have to remember he is also using SAE #s instead of the STD correction that most on this forum use. The SAE correction will make the #s lower then you are used to seeing around here. I prefer to use an SAE correction, instead of using the inflated STD #s. An N54 would be around the same #s with the same mods. Just wait until I dyno my car on a Mustang Dyno, everyone is going to be crying that my #s suck, because it dynos way lower then a Dynojet, but its much much more accurate.

htt- These #s are great IMO for DP and Tune only. Especially on 12.5-13psi 370rwtq on that boost SAE corrected is awesome. These N54 guys are just hating
Juiced,
This is exactly what the N54 community has a misconception about with the new N55. For SAE numbers I thought the car did very well, but with the new updated STD numbers "MORE TORQUE" :-) .... The torque makes the car feel like I got almost 80 to 90 hp gains. Horsepower sells products and cars, while torque proves performance and wins races
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      04-27-2011, 01:19 PM   #24
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60whp and ~70lbft gains at 12.5-13psi on 91oct. Sounds right.
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      04-27-2011, 05:06 PM   #25
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Quote:
Originally Posted by htt760 View Post
Horsepower sells products and cars, while torque proves performance and wins races
^^ this ^^ +1
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      04-27-2011, 06:44 PM   #26
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Wow +60hp/+80tq.. that is way way better than stock. 332 at the wheels is ~400 at the crank using 17% loss for DCT. Not bad at all. Also, the tune really illustrates how much the turbos are running out of steam >5.5k.
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      04-27-2011, 09:19 PM   #27
htt760
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under hard acceleration and spirited driving I shift right about 5800 to 6000 k because you can just feel the turbos fall flat on its face... But with the 7 speed, it keeps the powerband relitivley consistant and FAST...
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