BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Why do some cars seem to run so much stronger?

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      05-25-2012, 06:51 PM   #23

Drives: 09 335i X-Drive Black Sapphire
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Originally Posted by TwinTurboXI View Post
lemme next time you head to the strip...I'd love to go.
That'd be awesome, I'm typically the only bmw there against mostly mustangs, chargers, vettes and pickups.

Imports are stis, and mazdas.

It'd be nice to compare times to another xi even though you are a 6mt.

Test n tunes are usually Thursday nights, not sure how that works with your schedule. Typically it goes from 6-10. Let me know what weeks work for you.
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      05-25-2012, 09:20 PM   #24
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when i'm at the strip, I'll watch many of the other cars and even take notes so I can compare. And ask a couple guys in the lanes what mods they have... the stock cars with clean runs are the best to use as comparison.
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      05-26-2012, 11:09 AM   #25
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Drives: C6 Z06, 09 335i, 10 335xi
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Originally Posted by benzy89 View Post
Could be any combination of the things (or maybe just one specific thing):

  • Spark Plugs - Replace, try NGKs
  • Ignition Coils - Replace
  • Oil Change - Change fluids/filter
  • Fuel Injectors - Replace/upgrade
  • Intake Filters - Dirty/Low Quality filter
  • HPFP - Starting to die (you'd know if its dead = limp mode)
  • Transmission - With an AT, possible your gears aren't catching as well from launching the car
  • Carbon Build Up - Dirty intake valves
  • Boost Leak - If you're not data logging, you might not be aware that you have a boost leak. Could be your OEM DVs aren't holding boost, or you have a leak somewhere between your CP, DVs + FMIC

  • Different Tune/Boost settings - COBB Stg. 1 doesn't equal Vishnu Stg. 1 or BMS Stg. 1
  • Gas - Pump gas vs. Race is obvious, but even quality of 93 octane changes from gas station to station. I only use Top Tier Fuel (approved by BMW)
  • Meth Ratio - More aggressive mixture, 60:40 or 70:30
  • Upgraded Trans/Clutch
  • Car on a Diet - Lots of CF, Backseats were Removed, Lightweight Alloys, Higher Quality Tires
  • Driver Error - Even in an AT, you can be shifting at the wrong time (too early or too late). I know with my COBB tune, my power band starts to die around 6,000 RPMs. You'll need to data log to see find out your optimal shift point, see at what RPM does power start to fall off.
  • DTC - Make sure it's off
Good points. I would stick with fresh OEM Bosch plugs though.
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