New 2009 2010 BMW Z4 - ZPOST
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   New 2009 2010 BMW Z4 - ZPOST > BIMMERPOST Universal Forums > General Automotive (non-BMW) Talk + Photos/Videos

Post Reply
 
Thread Tools Search this Thread
      06-18-2021, 06:02 PM   #1
tranquility
sportscars only
tranquility's Avatar
Canada
3167
Rep
3,177
Posts

Drives: 2011 Z4 sDrive 35i
Join Date: Aug 2007
Location: Montréal

iTrader: (0)

Power-to-weight ratios for some sportscars

Just for fun I wanted to check out some cars I liked in comparison to my existing one. It's always a bit aggravating when they just talk about HP w/o mentioning the car's weight, so I like to know this ratio since it's a better indicator of how a car should perform.

I've lusted after a 4C and always thought that its ratio would be great but according to the figures that I found online, it's only marginally better than my Z4...how could that be? Maybe the figures aren't correct, or somebody mixed up the dry/wet weights?

Another nimble car is the MX-5 RF but the ratio is lower, but it's supposed to be near the best bang-for-buck handling car out there....maybe it still is, just that straight-line is not its forte (something like 1 second slower than the other 2 cars). I think the 0-60 times for the Z4 and 4C are near identical, so the ratios there check out, but I'm still sure the 4C must handle much better since it's way lighter.

Any other insights?
Attached Images
 
Appreciate 0
      06-18-2021, 06:32 PM   #2
ToddBlack88
Private First Class
ToddBlack88's Avatar
595
Rep
145
Posts

Drives: 2007 Z4MC 2010 F650GS
Join Date: Jul 2019
Location: North Vancouver

iTrader: (0)

Where are those numbers from, and which Z4?

The NA spec z4mc S54 motor makes 330hp and 262 ft/lb, and weighs 3230lb which is 1465kg .

That gives a .225xxxx. Hp per Kg
__________________
Current : 2007 Z4MC, 2010 F650gs, 2018 340i M Performance Edition, 2020 G310gs, 2009 128i
Past : 2001 325 cab, 2002 325xit, 1992 325 M tech ll appearance pack cab, 1990 325is, 1988 M3, 2012 328xit, 2009 M135i cab, 2016 M235i cab,

Last edited by ToddBlack88; 06-18-2021 at 06:38 PM..
Appreciate 0
      06-18-2021, 06:39 PM   #3
tranquility
sportscars only
tranquility's Avatar
Canada
3167
Rep
3,177
Posts

Drives: 2011 Z4 sDrive 35i
Join Date: Aug 2007
Location: Montréal

iTrader: (0)

Quote:
Originally Posted by ToddBlack88 View Post
Where are those numbers from, and which Z4?

The NA spec z4mc S54 motor makes 330hp and 262 ft/lb, and weighs 3230lb which is 1465kg
Look at my profile, I have an E89. I grabbed those figures from wiki.
Appreciate 0
      06-18-2021, 07:00 PM   #4
ToddBlack88
Private First Class
ToddBlack88's Avatar
595
Rep
145
Posts

Drives: 2007 Z4MC 2010 F650GS
Join Date: Jul 2019
Location: North Vancouver

iTrader: (0)

Ahh gotcha.
__________________
Current : 2007 Z4MC, 2010 F650gs, 2018 340i M Performance Edition, 2020 G310gs, 2009 128i
Past : 2001 325 cab, 2002 325xit, 1992 325 M tech ll appearance pack cab, 1990 325is, 1988 M3, 2012 328xit, 2009 M135i cab, 2016 M235i cab,
Appreciate 0
      06-18-2021, 08:57 PM   #5
Alfisti
Colonel
6435
Rep
2,996
Posts

Drives: 2008 Saab 9-3 Combi
Join Date: Nov 2014
Location: Toronto, Canada

iTrader: (0)

Good luck finding a 4C, prices have gone crazy.
Appreciate 1
      06-18-2021, 09:17 PM   #6
tranquility
sportscars only
tranquility's Avatar
Canada
3167
Rep
3,177
Posts

Drives: 2011 Z4 sDrive 35i
Join Date: Aug 2007
Location: Montréal

iTrader: (0)

Quote:
Originally Posted by Alfisti View Post
Good luck finding a 4C, prices have gone crazy.
Tx man for your sentiment. Unfortunately, that ship has sailed for me as I wanted a new one.
Appreciate 0
      06-18-2021, 10:27 PM   #7
Humdizzle
Brigadier General
6018
Rep
3,607
Posts

Drives: GT3 + M2c
Join Date: Oct 2016
Location: Missouri

iTrader: (0)

you probably want to use whp rather than what the manufacturer claims. some under rate some over rate.
__________________

2018 Porsche GT3 6MT
2021 M2C DCT
Previous: Ferrari 458 | R35 GTR | F80 M3 | E46 M3 | E36 M3 | Scion FRS
Appreciate 1
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 -5. The time now is 10:54 PM.




zpost
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
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