BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convert) (2008-2013)
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All AlbumsBlogs Garage Search Today's Posts Mark Forums Read Calendar FAQ

E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convert) (2008-2013) {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm}


Reply
 
Thread Tools Display Modes
Old Sat, Apr-21-2012, 12:53:02 PM   #1
taimur.shah
Registered User
 
Join Date: Apr 2012
Posts: 2
Reputation: 0 taimur.shah is on a distinguished road

United States




Default Fuel Questions?

This is my understanding so far...please correct me if any of this is wrong.

In Europe we have 95-99 octane fuel (lets not argue which dealer is best). In the US you guys have 91-93 Octane fuel which has a lower power rating which is why bhp in the states is generally slightly lower. All of these fuels have a 8-10% ethanol content.

However a fuel with 15% ethanol (E85) seems to have a higher power rating which is why it is used in some super cars. E85 is generally cheaper but many cars need bigger fuel injectors to use it properly. So first question...Why does E85 give more power?..Is it due to compression ratios or that energy released from ethanol??? Also why does it need bigger injectors?

Also people talk about meth injections...I presume this has a coolant effect??! So why? how? and when? would you set your car up to use a meth injection?
Jump to top taimur.shah is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Sat, Apr-21-2012, 04:03:00 PM   #2
mitch32
Registered User
 
Join Date: Apr 2012
Posts: 1
Reputation: 0 mitch32 is on a distinguished road

United States




Default

Loaded post you have there.

In USA and Europe they list octane numbers in different ways. Look up RON and MON on google. USA 91 is the same as European 94 octane.

E85 is hard to explain but firstly it has a higher octane rating and it's oxygenated. It's lambda though is lower, you need more fuel for the same amount of air. Bottom line is you make 30% more power on e85 especially when your forced induction.

Lastly Europe measures HP differently then North America, it's around 3% difference in power.
Jump to top mitch32 is offline   Reply With Quote
Old Mon, Apr-23-2012, 06:25:31 PM   #3
Wherryj
Registered User
 
Wherryj's Avatar
 
Join Date: May 2011
Posts: 149
In the garage:
Reputation: 0 Wherryj is on a distinguished road
Location: Livermore

United States




Default Re: Fuel Questions?

Mitch is correct. The OP's post also fails to mention the fact that Octane is NOT a measure of power content. It is a measure of the fuel's resistance to premature detonation under pressure.

Higher octane does not necessarily mean higher power content. It does typically mean the capability of running higher compression without knocking/CPU advancing the timing.
Jump to top Wherryj is offline   Reply With Quote
Old Mon, Apr-23-2012, 10:56:05 PM   #4
SYT_Shadow
Piraña Powered
 
SYT_Shadow's Avatar
 
Join Date: Oct 2009
Posts: 2,388
Blog Entries: 1
Reputation: 0 SYT_Shadow is on a distinguished road
Location: Westchester/NY

Spain




Default Re: Fuel Questions?

[QUOTE=taimur.shah;1065473448]which has a lower power rating which is why bhp in the states is generally slightly lower[QUOTE]

Mitch is correct. The difference between power ratings is due to the difference in units of measure. Both are exactly as fast regarless of what you're measuring it in.

Look up a physics table and you'll see the conversion from horsies to kW varies depending on metric or standard. That's the difference you see.

As power ratings assume a certain % of variation, manufacturers could in theory give the same numbers in Europe and the US, they just choose not to.

Personally I think it's stupid that the M3 is rated at a retarded 414hp here instead of a nice flat 420hp as in Europe
Jump to top SYT_Shadow is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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

Forum Jump



All times are GMT. The time now is 04:58:09 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright ©1999-2014 M3Forum.com
Discussing Fuel Questions? in the E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convert) (2008-2013) Forum - {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm} at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)