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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 > 156mph at 5500rpm



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      07-20-2009, 05:29 AM   #1
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156mph at 5500rpm

That is what my 335i read as I hauled down the A6. I figured that by the time we would hit max RPM, if we had enough power, we could get to 198.5mph.

How much more power would this require?

Bone stock 335i, 10k miles.
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      07-20-2009, 05:41 AM   #2
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I made 294km/h (on GPS) and there were still ~200rpm left. So, 300 km/h is achievable. Mods in my signature (I was stage 1 then, no FMIC). There's a video in video section. My car is MT. AT - a bit faster.
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      07-20-2009, 07:00 AM   #3
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what a rush. was that scary at all?

be careful, pls. we don't want to lose any members to this end.
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      07-20-2009, 07:31 AM   #4
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Quote:
Originally Posted by edo View Post
I made 294km/h (on GPS) and there were still ~200rpm left. So, 300 km/h is achievable. Mods in my signature (I was stage 1 then, no FMIC). There's a video in video section. My car is MT. AT - a bit faster.
I thought AT should not be able to get this high due to it's shorter gearing.
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      07-20-2009, 07:39 AM   #5
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Originally Posted by kyleb350 View Post
I thought AT should not be able to get this high due to it's shorter gearing.
As far as I remember, first 4 gears are shoter, 5th and 6th - longer.

But I don't actually care
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      07-20-2009, 08:01 AM   #6
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Expectations are between 290-310 km/h (depending on circumstances)

I have a GPS measured top of 304km/h under perfect circumstances on RON100... had 400-500 revs left but because the used track ended I had to break.. (interesting experience at that speed by the way)...

Be aware this topic might lead to discussion.... :-D
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      07-20-2009, 08:01 AM   #7
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Quote:
Originally Posted by svtfast View Post
That is what my 335i read as I hauled down the A6. I figured that by the time we would hit max RPM, if we had enough power, we could get to 198.5mph.

How much more power would this require?

Bone stock 335i, 10k miles.

I hit a GPS-verified 183mph (295kph) on a stretch of the A61 towards Nurburg before having to brake due to bends on the autobahn! To get much more speed, I would need at least another 100bhp, and stay off the public roads! The main problem at that speed however is the amount of front-end lift there is - it gets a little(!) wayward as my car didn't have any front aerodynamics to keep the nose planted. I'll be giving it a go again in a couple of weeks to see what effect the Hartge front lip has on countering the effects of front-end lift at high speeds.

Incidentally - car was a 335i AT, with DMS flash, AR catless downpipes, Code3 FMIC, standard airbox and exhaust (oh, and AP Racing brakes all round to help me stop!)
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      07-20-2009, 08:17 AM   #8
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Yeah lift becomes a serious challenge... I did not experience front nose draft but my rear started to lift slightly...

Since some months I have an open rear diffuser and the MTech nose and planning to give it a new try somewhere end of the summer to see if the lift is now better controlable....

I have been phoning with the sports department of Michelin to see what this does to the tyres, I run PS2's. They are certified up to 300km/h but for a not to long moment. They advice to replace the tyres after the attempt... :-D

But anyhow, if possible to do it on a controlled environment / autobahn, it is a real nice experience...
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      07-20-2009, 08:54 AM   #9
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This has been discussed before, but my math has this...

Manual on stock sport or non-sport tires at 7k RPM=194.36
Auto on stock sport or non-sport tires at 7k RPM=218.15

Both E90 and E92 have a Cd of .30 so I'll let you figure out how much power you'll need to overcome drag to get to that speed.
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      07-20-2009, 08:57 AM   #10
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Quote:
Originally Posted by Railgun View Post
This has been discussed before, but my math has this...

Manual on stock sport or non-sport tires at 7k RPM=194.36
Auto on stock sport or non-sport tires at 7k RPM=218.15

Both E90 and E92 have a Cd of .30 so I'll let you figure out how much power you'll need to overcome drag to get to that speed.
show the work.
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      07-20-2009, 09:02 AM   #11
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http://www.csgnetwork.com/speedcalc.html



But again, there are other threads that exist with this info.
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      07-20-2009, 10:00 AM   #12
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Quote:
Originally Posted by rismo123 View Post
I did not experience front nose draft but my rear started to lift slightly...
I didn't feel anything Was very pleased of how my car was acting at such speed.

The vid:
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      07-20-2009, 10:24 AM   #13
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Given the circumstances the lift was minimal... but still it was there... great vid!

WIll shoot some vid during this years attempt...
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      07-20-2009, 12:12 PM   #14
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This is total madness without the right aero and suspension tweaks. With them, it is still very dangerous.

The chance of surviving a mishap that occurs at 150+ mph is close to zero.
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      07-20-2009, 12:17 PM   #15
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theoretical max for MT should be 196~ at 7k. AT is ~173-174 at 7k rpm...
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      07-20-2009, 12:52 PM   #16
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Quote:
Originally Posted by Slidewayz View Post
This is total madness without the right aero and suspension tweaks. With them, it is still very dangerous.

The chance of surviving a mishap that occurs at 150+ mph is close to zero.
Thanks for the information.
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      07-20-2009, 12:56 PM   #17
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Quote:
Originally Posted by kjrulz View Post
show the work.
rpm*circumference of wheel*60/(final gear*6th gear*12*5280)

AT final gear= 3.46 6th gear = 0.69
Mt final gear= 3.08 6th gear = 0.87

tire height = 25"

max speed AT = 218.07
max speed MT = 194.29

all neglecting tire distortion.
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      07-20-2009, 01:01 PM   #18
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Gear............Automatic.........Manual

Final Drive........3.46..............3.08

1st.................4.17...............4.06
2nd................2.34...............2.40
3rd.................1.52...............1.58
4th.................1.14...............1.19
5th..................87.................1.00
6th..................69...................87

.................Automatic..............Manual.... ...........Manual w/Automatic Rear
1st...............36MPH.................42MPH..... ..............37MPH
2nd...............64MPH................70MPH...... ..............63MPH
3rd................99MPH...............107MPH..... ..............95MPH
4th..............132MPH...............142MPH...... .............127MPH
5th*............173MPH...............169MPH....... ............150MPH
6th*............218MPH...............195MPH....... ............173MPH
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      07-20-2009, 01:03 PM   #19
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And as you can see my manual calculations are exactly the same as RoadandTracks 335i statistics

http://www.roadandtrack.com/assets/d...R_BMW_335i.pdf
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      07-20-2009, 06:33 PM   #20
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Quote:
Originally Posted by 09AlpineTTSedan View Post
And as you can see my manual calculations are exactly the same as RoadandTracks 335i statistics

http://www.roadandtrack.com/assets/d...R_BMW_335i.pdf
thanks for the info
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      07-20-2009, 06:42 PM   #21
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Quote:
Originally Posted by Spydeputy View Post
what a rush. was that scary at all?

be careful, pls. we don't want to lose any members to this end.
I did the same with my 335i e90 and it felt completely solid. Granted I didn't stay at the speed for long, but I felt comfortable that the car could easily have maintained it for a while.
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      07-20-2009, 07:20 PM   #22
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Quote:
Originally Posted by edo View Post
I didn't feel anything Was very pleased of how my car was acting at such speed.

The vid:
You gots balls doing it at 1 AM!!! I'd prefer to do it in the daytime so I could actually see the road ahead!
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