Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 


Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-22-2017, 07:33 AM   #31 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,216

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 41
Thanked 342 Times in 257 Posts
Quote:
Originally Posted by AdrianD View Post

Later edit:
About the soot on the tailpipe, as far as I know Miatas are tuned rich from the factory. If you want to get that out of the way, take a look at Speeduino, open source ECU. Cheap, already available with plugs for the Miata wiring harness and tunable with the same software as Megasquirt.
There's also the air-flow meter adjustment that will lean it out.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-22-2017, 07:34 AM   #32 (permalink)
Master EcoModder
 
Stubby79's Avatar
 
Join Date: Sep 2012
Location: Victoria, BC
Posts: 1,216

Firefly EV - '98 Pontiac Firefly EV
90 day: 107.65 mpg (US)

Little Boy Blue - '05 Toyota Echo
90 day: 33.35 mpg (US)

BlueZ - '19 Nissan 370Z Sport
90 day: 17.19 mpg (US)
Thanks: 41
Thanked 342 Times in 257 Posts
Quote:
Originally Posted by AdrianD View Post

Later edit:
About the soot on the tailpipe, as far as I know Miatas are tuned rich from the factory. If you want to get that out of the way, take a look at Speeduino, open source ECU. Cheap, already available with plugs for the Miata wiring harness and tunable with the same software as Megasquirt.
There's also the air-flow meter adjustment that will lean it out.

Oh and between my cleaning the ground connections and installing a heated O2 sensor, my tail pipe isn't quarter as sooty as it used to get.
  Reply With Quote
Old 09-22-2017, 08:12 AM   #33 (permalink)
EcoModding Lurker
 
Join Date: Apr 2012
Location: Overseas
Posts: 43
Thanks: 2
Thanked 13 Times in 10 Posts
Quote:
Originally Posted by Stubby79 View Post
There's also the air-flow meter adjustment that will lean it out.

Oh and between my cleaning the ground connections and installing a heated O2 sensor, my tail pipe isn't quarter as sooty as it used to get.
I never knew about the air-flow meter adjustment. Could be different between the 1.8 and 1.6 models.

A new O2 sensor would definitely help.
There are reports of people who turbo Miatas and get better mileage if they keep out of boost, as the stock tune could be leaned out.
  Reply With Quote
Old 09-22-2017, 09:03 AM   #34 (permalink)
Furry Furfag
 
Baltothewolf's Avatar
 
Join Date: Nov 2013
Location: Apple Valley
Posts: 2,084

Winsight - '00 Honda Insight
90 day: 56.69 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 28.53 mpg (US)
Thanks: 67
Thanked 403 Times in 309 Posts
Quote:
Originally Posted by AdrianD View Post
I never knew about the air-flow meter adjustment. Could be different between the 1.8 and 1.6 models.

A new O2 sensor would definitely help.
There are reports of people who turbo Miatas and get better mileage if they keep out of boost, as the stock tune could be leaned out.
You can't adjust the AFM on the 1.8 cars, only the 1.6.

Heated o2 definitely helps. Worth doing, considering how cheap iit is.

Typical gains on a aftermarket ECU wkth a completely stock engine are 10%, sometimes as high as 15%.
__________________

  Reply With Quote
Old 09-22-2017, 10:01 AM   #35 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 20,776

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
Last 3: 51.27 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 60.34 mpg (US)
Thanks: 2,632
Thanked 5,537 Times in 2,840 Posts
Yup: I've done the timing advance:



And as of yesterday afternoon, the airflow meter spring adjustment as well:



Going right now to see how it affects a cold start...

UPDATE: the car has always had a slight stumble/miss on cold starts that lasts 10-15 seconds (plug wires?). It was possibly slightly worse on this start-up, but not significantly. Could be my imagination. I'll leave the adjustment where it is.
Attached Thumbnails
Click image for larger version

Name:	IMG1100.jpg
Views:	241
Size:	60.2 KB
ID:	22875   Click image for larger version

Name:	IMG1101.jpg
Views:	257
Size:	65.0 KB
ID:	22876  
__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 09-22-2017, 10:19 AM   #36 (permalink)
Batman Junior
 
MetroMPG's Avatar
 
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 20,776

Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
Last 3: 51.27 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
90 day: 60.34 mpg (US)
Thanks: 2,632
Thanked 5,537 Times in 2,840 Posts
Quote:
Originally Posted by AdrianD View Post
Regarding differentials and gearing, I installed a 3.9 differential in mine, while it originally came with a 4.1 (94 model, with the 1.8). The new diff is off a 10th anniversary NB model. The rev difference is not a lot but it makes for a tad quieter ride. In town however I used to drive almost everywhere in 5th gear, now I only use 5th above 40mph as if feels that I'm lugging the engine.
Even with just the taller rear tires, I've noticed I use 5th in town a little less than I used to.

Quote:
If you could live without having the top down, you could invest in a hardtop plus a hardtop spoiler.
Heresy! I wouldn't have bought it at any price if it wasn't a convertible. There will be no more talk of fixed hard tops in this thread!
__________________
Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



EcoModder
has launched a forum for the efficient new Mitsubishi Mirage
www.MetroMPG.com - fuel efficiency info for Geo Metro owners
www.ForkenSwift.com - electric car conversion on a beer budget
  Reply With Quote
Old 09-22-2017, 11:24 AM   #37 (permalink)
Not Doug
 
Xist's Avatar
 
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 7,179

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 34.82 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 34.3 mpg (US)
Thanks: 4,450
Thanked 1,388 Times in 1,045 Posts
What if you got a really good deal?!
  Reply With Quote
Old 09-22-2017, 11:31 AM   #38 (permalink)
EcoModding Lurker
 
kurzer's Avatar
 
Join Date: Dec 2011
Location: Germany
Posts: 96

Knut - '07 Toyota Prius
90 day: 50.9 mpg (US)

Santa - '00 Hyundai Santamo
90 day: 29.07 mpg (US)
Thanks: 56
Thanked 42 Times in 30 Posts
Quote:
Originally Posted by MetroMPG View Post
the car has always had a slight stumble/miss on cold starts that lasts 10-15 seconds (plug wires?).
this is a common problem with miatas. the heat kills the plug wires, the plug wires kill the coil. dont use the old wires too long, 50.000-60.000km is the time to change.
__________________
kurzer Gruß

Prius II
Hyundai Santamo
  Reply With Quote
The Following User Says Thank You to kurzer For This Useful Post:
MetroMPG (09-22-2017)
Old 09-22-2017, 12:55 PM   #39 (permalink)
Furry Furfag
 
Baltothewolf's Avatar
 
Join Date: Nov 2013
Location: Apple Valley
Posts: 2,084

Winsight - '00 Honda Insight
90 day: 56.69 mpg (US)

Miaderp - '95 Mazda Miata
90 day: 28.53 mpg (US)
Thanks: 67
Thanked 403 Times in 309 Posts
Heat wrapping the headers helps a lot with the above statement, but you lose warm up efficiency so...
__________________

  Reply With Quote
Old 09-22-2017, 05:12 PM   #40 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 12,321
Thanks: 2,939
Thanked 4,002 Times in 3,176 Posts
Quote:
There will be no more talk of fixed hard tops in this thread!
Carson-style aerocap?

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com