BMW X3 Forum
BMW X3 Forum
Welcome to the ultimate BMW X3 community.
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
XBimmers | BMW X3 Forum BMW X3/X4 Forums Third Generation BMW X3 (G01) General Forum (2017+) Math wiz help. Horsepower estimate based on speed

Post Reply
 
Thread Tools Search this Thread
      05-17-2018, 04:24 PM   #1
Seaz
Second Lieutenant
Seaz's Avatar
Canada
106
Rep
216
Posts

Drives: (2018,x3,m40) 2016,x3 2009,335
Join Date: Apr 2012
Location: Montreal, Quebec

iTrader: (0)

Math wiz help. Horsepower estimate based on speed

So my goal is to figure out my approximate horse power without spending money on a dyno

With mods I've been running the 1/4 mile in 12.5
A stock m40 is suppose to do 13.2

So could we figure out the increase in horsepower to drop 0.7sec?
__________________
I see normal people , I'm not one of them

2018 X3 M40i - JB4
2016 X3 35i - JB stage 1
2009 335 e92 - JB4
Appreciate 0
      05-17-2018, 04:47 PM   #2
yllwwgn
First Lieutenant
yllwwgn's Avatar
81
Rep
338
Posts

Drives: 2018 X3 M40i
Join Date: Oct 2013
Location: Milky Way, Earth, North America, Arizona more specifically.

iTrader: (0)

My butt-dyno calculates out roughly another 75HP based on the weight of our cars. But I too await a more analytical and accurate answer rooted in math and not butts....
__________________


"Since light travels faster than sound, some people appear bright until you hear them speak".
Appreciate 0
      05-17-2018, 05:08 PM   #3
Seaz
Second Lieutenant
Seaz's Avatar
Canada
106
Rep
216
Posts

Drives: (2018,x3,m40) 2016,x3 2009,335
Join Date: Apr 2012
Location: Montreal, Quebec

iTrader: (0)

using this calculator I got 436hp

http://www.dragtimes.com/horsepower-...power+Estimate
Appreciate 0
      05-17-2018, 05:20 PM   #4
Tony
Second Lieutenant
16
Rep
238
Posts

Drives: 2018 X3 M40i
Join Date: Mar 2005
Location: Rockland County

iTrader: (0)

BMW is lying about the stock HP numbers.
Appreciate 0
      05-17-2018, 05:28 PM   #5
Pray for Mojo
Second Lieutenant
Canada
24
Rep
283
Posts

Drives: 2014 M235i & 2018 X3 M40i
Join Date: Apr 2014
Location: Calgary

iTrader: (0)

Quote:
Originally Posted by Tony View Post
BMW is lying about the stock HP numbers.
I'm inclined to believe this as well. Stock m240 xdrive has same 0-60 time with 700lbs less weight.
Appreciate 0
      05-17-2018, 06:48 PM   #6
Tony
Second Lieutenant
16
Rep
238
Posts

Drives: 2018 X3 M40i
Join Date: Mar 2005
Location: Rockland County

iTrader: (0)

Quote:
Originally Posted by Pray for Mojo View Post
I'm inclined to believe this as well. Stock m240 xdrive has same 0-60 time with 700lbs less weight.
Ford Focus RS has the "Same" HP while being slower and weighing 1000 lbs less.

The Audi SQ5 has similar HP numbers and when I test drove the SQ5 it felt slow. Slower than my prior car the Audi S3 for sure. My X3 M40i feels faster than my S3.
Appreciate 0
      05-17-2018, 08:19 PM   #7
Quick18
New Member
6
Rep
19
Posts

Drives: X3 M40i
Join Date: Feb 2018
Location: North Carolina

iTrader: (0)

357 at Rear Wheels?

436 calculated at flywheel x .18 (drivetrain loss) =78.45

Subtract 436-78.45 = 357.55 at the rear wheels.

BMW is just reporting at the rear wheels?
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 05:44 PM.




xbimmers
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST