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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 > How high can you Rev the stock 335I?



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      05-07-2017, 06:31 PM   #1
natedog7700
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How high can you Rev the stock 335I?

With the new XHP flashtool out, i believe the rev limiter is deleted completely with the stage 3 tune. How high can we safely rev the N54/N55? I realize it makes no sense with stock turbos but with my RB's i make power all the way up to 6850 according to my dyno. Now, i would like to do a 60-130 VBOX test and i believe i could hit 130 in 4th gear without shifting to 5th but it would be around 7200 ish RPM's. Thats why im asking.
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      05-07-2017, 07:19 PM   #2
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See if you can fit a tire thats 25.6+ inches - maybe a 275-40 or something. That should get you over the 130mph mark and still be slightly below 7000. Considering the n54 is a torque motor, theres probably not a lot of focus on oil control as you get near 7000, I woudnt really want to enter into that area of exploration myself.

Im sure its still making hp there, but would probably be making more torque if another gear were available... unfortunately you dont have that option.
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      05-07-2017, 08:18 PM   #3
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Quote:
Originally Posted by 335e92tx View Post
See if you can fit a tire thats 25.6+ inches - maybe a 275-40 or something. That should get you over the 130mph mark and still be slightly below 7000. Considering the n54 is a torque motor, theres probably not a lot of focus on oil control as you get near 7000, I woudnt really want to enter into that area of exploration myself.

Im sure its still making hp there, but would probably be making more torque if another gear were available... unfortunately you dont have that option.
Thats an idea! Not sure i have anything available though. I figured out Cobb sets a 7200 rev limit for their tunes so that must be safe according to them. I think i need a little more than that though.
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      05-07-2017, 09:11 PM   #4
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Quote:
Originally Posted by natedog7700 View Post
Thats an idea! .
Old school gearing trick..
;-)
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      05-07-2017, 11:52 PM   #5
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I've been 7200-7400 for years on my stock motor. I don't hang out there all day though.

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      05-08-2017, 12:17 AM   #6
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The only reason to be hanging out beyond 6k RPM is if your on upgraded turbos. If your on stock turbos its best to shift just before 6K RPM. Take your car to the track or get a vBox and your traps will speak for themselves.

Last edited by BQTuning; 05-08-2017 at 12:42 PM.
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      05-08-2017, 02:10 AM   #7
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Yeah I would stay under 7500 for now. Let someone else be the guinea pig.
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      05-08-2017, 01:04 PM   #8
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Quote:
Originally Posted by ******** View Post
The only reason to be hanging out beyond 6k RPM is if your on upgraded turbos. If your on stock turbos its best to shift just before 6K RPM. Take your car to the track or get a vBox and your traps will speak for themselves.
I have upgraded turbos, and i keep making power all the way up to 6800 as stated before. Im trying to do a 60-130 VBOX test and wondering if i can get away with shifting one gear.
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      05-08-2017, 01:55 PM   #9
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Quote:
Originally Posted by natedog7700 View Post
I have upgraded turbos, and i keep making power all the way up to 6800 as stated before. Im trying to do a 60-130 VBOX test and wondering if i can get away with shifting one gear.
Yea I gotcha on that, I just couldn't help myself to imagine what some curious George on stockers would start thinking after reading the previous post replies so I was trying to eliminate that fantasy thought before it manifested. Ive seen some bizarre things, so please excuse.

Base on this http://www.e90post.com/forums/showthread.php?t=477054

and based on my personal experience with 6MT, 6AT, and DCT N54 cars, that I own or have owned, that might be difficult.

I do see your point on pushing out the RPM if it would reduced shifting to get to a certain MPH. It all comes down to gear ratio from what I understand, but I may be wrong.
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      05-08-2017, 06:04 PM   #10
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I haven't seen many cars with a need to go past 7500rpm but the stock motor will do it. I set the limiter to 7300 in most 6mt cars. There's a couple back in the day that were revving even higher on stock head but it's diminishing returns and valve float any higher without putting in some hardware work. Also, there is a torque limiter that can catch you occasionally when you are shifting at high RPM in higher gears, 2048 iirc.
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      05-09-2017, 07:56 AM   #11
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You can rev it all the way until it breaks
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