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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 > So why a map8 335i doesn't go as quick as a stock 330i?



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      11-15-2014, 10:31 PM   #1
z19930612
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So why a map8 335i doesn't go as quick as a stock 330i?

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With same engine capacity and rev limit, so does it mean that a twin turbo charged N52 going to nail the N54
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      11-15-2014, 10:38 PM   #2
Jeef
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Map 8? Economy mode? No turbos and still has all the piping to go through it's slower than a 328, 330
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      11-15-2014, 10:45 PM   #3
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Quote:
Originally Posted by z19930612
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With same engine capacity and rev limit, so does it mean that a twin turbo charged N52 going to nail the N54
Because the engine is completely different and map 8 is not any means of a "go" map. Annnnnd try the boost levels that we run on the n54 and watch that 52 disintegrate.
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      11-16-2014, 12:33 AM   #4
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Because turbo engines are meant to be run with the turbo working, otherwise it's just a big exhaust restriction not to mention all the calibrations revolve around a boosted application (timing, AFR, compression ratio would all be different if it was designed to run without boost). Hence an N54 in limp mode does not turn the car into a 328 or 330i.
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      11-16-2014, 01:40 AM   #5
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Quote:
Originally Posted by stanlalee
Because turbo engines are meant to be run with the turbo working, otherwise it's just a big exhaust restriction not to mention all the calibrations revolve around a boosted application (timing, AFR, compression ratio would all be different if it was designed to run without boost). Hence an N54 in limp mode does not turn the car into a 328 or 330i.
And /thread.
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      11-16-2014, 12:17 PM   #6
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I bet with tweaking to the vanos/fuel/timing tables you could get 10-20whp from map8+naturally aspirated flash, probably be in the 200-220whp range or so, maybe even a little higher. But that's kinda crazy talk.
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      11-16-2014, 12:23 PM   #7
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Also gear ratios are different on N/A vs turbo.
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