Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-12-2018, 07:28 PM   #141 (permalink)
Master EcoModder
 
euromodder's Avatar
 
Join Date: Jul 2010
Location: Belgium
Posts: 4,683

The SCUD - '15 Fiat Scudo L2
Thanks: 178
Thanked 652 Times in 516 Posts
Quote:
Originally Posted by 19bonestock88 View Post
My ex got 28mpg hwy with her 2011 1.4T Cruze while my 2004 Saturn with its 2.2 liter engine got 30-32hwy when stock, at a similar speed
But @ far lower rpm

When not pulsing & coasting, I do 20mph / 30kph zones in 4th these days
Barely above tickover with a 1L (atmospheric) , small car.

Great mileage due to low rpm.

__________________
Strayed to the Dark Diesel Side

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-13-2018, 12:31 AM   #142 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 12,548
Thanks: 0
Thanked 1,622 Times in 1,447 Posts
Quote:
Originally Posted by niky View Post
New turbo engines have relatively high compression. Plus direct injection, which theoretically gets you much better idling efficiency.
Direct injection usually can do miracles in regard to fuel savings.
  Reply With Quote
Old 10-13-2018, 02:27 AM   #143 (permalink)
EcoModding Lurker
 
Join Date: Oct 2018
Location: Netherlands
Posts: 12

Focus - '02 Ford Focus Trend
90 day: 36.75 mpg (US)

Fizzy - '87 Yamaha FS1 2RU
90 day: 59.71 mpg (US)

Polo - '97 Volkswagen Polo
90 day: 36.21 mpg (US)

Golf - '17 Volkswagen Golf Bluemotion Connected
90 day: 48.93 mpg (US)
Thanks: 6
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by MetroMPG View Post
^ How many furlongs per bushel are you getting?
A lot, damn animal was stuck in eco-mode

Driving back home gave me the chance to try and find out a bit about my car's DFCO (which only seems to work above ~40MPH), so I've learned a lot yesterday!
  Reply With Quote
Old 10-13-2018, 03:25 AM   #144 (permalink)
Master EcoModder
 
Join Date: Aug 2010
Location: Philippines
Posts: 2,173
Thanks: 1,739
Thanked 589 Times in 401 Posts
Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
Direct injection usually can do miracles in regard to fuel savings.
The problem is when she's running hot, she's running hot. Fuel economy goes out the window.
  Reply With Quote
Old 10-13-2018, 03:19 PM   #145 (permalink)
Master EcoModder
 
Join Date: Jan 2009
Location: USA
Posts: 263

Winsight - '06 Honda Insight
Gen-1 Insights
90 day: 72.19 mpg (US)
Thanks: 244
Thanked 86 Times in 61 Posts
With numbers like that, will it just convince people the V8 is the way?
__________________
  Reply With Quote
Old 10-15-2018, 12:36 PM   #146 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 12,390

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 26.68 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)
Thanks: 4,187
Thanked 4,378 Times in 3,353 Posts
So these turbo engine vehicles might get better fuel economy in stop and go driving, but worse in steady cruise?

I know Toyota gave the Gen III and IV Prius a larger displacement than the Gen I and II. Displacement must not be such a huge economy penalty as long as you can keep the engine near the BSFC sweet spot.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 10-15-2018, 01:57 PM   #147 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 12,548
Thanks: 0
Thanked 1,622 Times in 1,447 Posts
Quote:
Originally Posted by niky View Post
The problem is when she's running hot, she's running hot. Fuel economy goes out the window.
Well, at least with port-injection and a lower compression ratio, not only there is some temperature drop in the air intake due to the fuel vaporizing but also the aerodinamic heating is not so intense. No wonder Chevy retained the port-injection 6.0L V8 in the Silverado 2500 and 3500 instead of resorting to direct injection like it did in the 1500, not to mention the Suburban HD.
  Reply With Quote
Old 10-16-2018, 01:24 PM   #148 (permalink)
Full sized hybrid.
 
Isaac Zackary's Avatar
 
Join Date: Apr 2015
Location: Colorado
Posts: 602

Suzy - '13 Toyota Avalon Hybrid XLE
90 day: 37.18 mpg (US)
Thanks: 369
Thanked 108 Times in 84 Posts
Quote:
Originally Posted by redpoint5 View Post
I get the impression that turbo charging a smaller engine is no longer the fuel efficient way. Perhaps due to the lower compression ratio?
Quote:
Originally Posted by redpoint5 View Post
So these turbo engine vehicles might get better fuel economy in stop and go driving, but worse in steady cruise?

I know Toyota gave the Gen III and IV Prius a larger displacement than the Gen I and II. Displacement must not be such a huge economy penalty as long as you can keep the engine near the BSFC sweet spot.
I don't believe everything this guy says. But he seems to have a good point. Traditionally turbocharged engines are made with lower CR's, use a lot more high load enrichment and retard the timing much more than N/A engines. The result is worse fuel economy. But if other forms of knock control are done properly, like cooled EGR, a turbocharged engine can theoretically get good fuel mileage.

[YouTube]
__________________
  Reply With Quote
The Following User Says Thank You to Isaac Zackary For This Useful Post:
Xist (11-19-2018)
Old 10-16-2018, 06:13 PM   #149 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 12,548
Thanks: 0
Thanked 1,622 Times in 1,447 Posts
Cooled EGR sounds like a reasonable approach to knock control too. Well, unless it's some random engine fitted with VVT and resorting to some "internal" non-cooled EGR to raise its temperature quicker, I see no reason for EGR to not be cooled anyway...
  Reply With Quote
Old 10-16-2018, 06:17 PM   #150 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 12,390

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 26.68 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)
Thanks: 4,187
Thanked 4,378 Times in 3,353 Posts
Quote:
Originally Posted by cRiPpLe_rOoStEr View Post
Cooled EGR sounds like a reasonable approach to knock control too. Well, unless it's some random engine fitted with VVT and resorting to some "internal" non-cooled EGR to raise its temperature quicker, I see no reason for EGR to not be cooled anyway...
That's covered in this video:


__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
The Following User Says Thank You to redpoint5 For This Useful Post:
Xist (11-19-2018)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com