Jump to content

The Dutch, Scottish, & Indian people megathread (Driving economically)


Roman
 Share

Recommended Posts

21 hours ago, Sunbeam said:

This is harder than I thought, as my strong sense of shame is battling with my scientific curiosity. I have made the eco bar go into the red twice already.


Buy an OBD2 reader then connect a phone or tablet up to it, and set it up so you can watch the fuel economy in real time on the dash. 
As well as the numbers from your trip so far.

Then it becomes a game where you need to try get a better score, rather than demoralizing and dreary haha.

  • Like 6
Link to comment
Share on other sites

  • Replies 342
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

42 minutes ago, Roman said:


Buy an OBD2 reader then connect a phone or tablet up to it, and set it up so you can watch the fuel economy in real time on the dash. 
As well as the numbers from your trip so far.

Then it becomes a game where you need to try get a better score, rather than demoralizing and dreary haha.

Already on it! Geeking out hard.

  • Like 2
  • Thanks 1
Link to comment
Share on other sites

Curses that Takaka hill and our Riwaka hill.

Just re-filled Minky k11 and it returned a 6.7/100 - way worse than our low 5's due to driving over each way Takaka hill plus driving our local hill pretty much every time we use the car. It's not terrible but I want better.

Still- its so fun on the hills :-)

  • Like 3
Link to comment
Share on other sites

20 hours ago, Roman said:

Needs a speeduino, using some fuel cut decel and lean burn strategies and it'll pay for itself pretty quick :D 

I've been wondering about this recently, the cost of ecu + tune versus fuel saving based on the 30 year old tech/tune (no oxygen sensor and basic AFM, non-variable TPS etc). 

I'll hopefully be back to dailying my 1.6 MX5 within the next few months after I paint it. But the funny thing is its worse on fuel than my 2L 3sge Celica (St202 with acis, which seems to work pretty well) for the same drive. I thought maybe it was just because of the way I drove the MX5, but a work mate here has had a few and he reckons they are all surprisingly thirsty.

I have a Speeduino to go in, whether I do that with the stock intake or with ITB's I'm not sure. It would be interesting to see what sort of fuel economy increase I could get.

They have a lowish 9.4:1 compression ratio so it would be worth shaving the head too.

 

  • Like 1
Link to comment
Share on other sites

29 minutes ago, ~Slideways~ said:

I've been wondering about this recently, the cost of ecu + tune versus fuel saving based on the 30 year old tech/tune (no oxygen sensor and basic AFM, non-variable TPS etc). 

I'll hopefully be back to dailying my 1.6 MX5 within the next few months after I paint it. But the funny thing is its worse on fuel than my 2L 3sge Celica (St202 with acis, which seems to work pretty well) for the same drive. I thought maybe it was just because of the way I drove the MX5, but a work mate here has had a few and he reckons they are all surprisingly thirsty.

I have a Speeduino to go in, whether I do that with the stock intake or with ITB's I'm not sure. It would be interesting to see what sort of fuel economy increase I could get.

They have a lowish 9.4:1 compression ratio so it would be worth shaving the head too.

 

Shame Speeduino doesn't have DBW options currently or you could get some Motorbike ITBs like Roman 

Wasn't there a guy on here who built a mx5 with a later model head and high compression?

Link to comment
Share on other sites

12 minutes ago, shrike said:

Shame Speeduino doesn't have DBW options currently or you could get some Motorbike ITBs like Roman 

Wasn't there a guy on here who built a mx5 with a later model head and high compression?

My bike ITB's actually did have a DBW set up but it was on the 2nd set of throttles which simple don't seal like the 'real' set do. 

Yep there is, he's got a build thread too. Really cool swap, I reckon it'd need a cert simply because it looks like a different engine though. Probably the same with ITB's too unless you have a real lenient wof place. 

  • Like 1
Link to comment
Share on other sites

9 minutes ago, ~Slideways~ said:

My bike ITB's actually did have a DBW set up but it was on the 2nd set of throttles which simple don't seal like the 'real' set do. 

Yep there is, he's got a build thread too. Really cool swap, I reckon it'd need a cert simply because it looks like a different engine though. Probably the same with ITB's too unless you have a real lenient wof place. 

Sorry for thread spam but depending on how you do it could always swap back to factory intake for wofs lol. Used to have a mate that took the turbo off his skyline for every wof haha

Actually if they are in a box not sure if some places would even notice

  • Like 1
Link to comment
Share on other sites

Has anyone done any accurate testing on mileage vs cost on 91 vs 95 vs 98 on an engine that could run happily on any of them?

 

I wonder could the extra cost of 98 or 95 be outweighed by mileage gained by the ability to have more timing, or is the price difference too much to be worthwhile 

Link to comment
Share on other sites

37 minutes ago, cletus said:

Has anyone done any accurate testing on mileage vs cost on 91 vs 95 vs 98 on an engine that could run happily on any of them?

 


Just looking at local prices right now 

 

91 octane $2.49
95 octane $2.73
98 octane $2.83

So for either of the options to be cost neutral against 91, you'd need to gain: 
9.6% fuel efficiency for 95 octane 
13.6% efficiency for 98 octane
There's no way you'll get those numbers. 

Avoiding E10 is probably the best thing to do, because stoich of E10 is actually around 14.2 instead of 14.7. 
so if your oxygen sensor is trying to find stoich you're going to be using 3.5% more gas.

  • Like 1
  • Thanks 1
Link to comment
Share on other sites

irrelevant sharn;   e10 also needs a few degrees less timing  to make the same power as normal 95.   but both make the same power if not knock limited and timing set right for the fuel used.     so if your engine was under timed for 95 and  just throw some e10 98 in the tank it would gain a little power

  • Like 2
  • Thanks 1
Link to comment
Share on other sites

Speaking of such things, I've been getting pretty so-so economy on this tank of gas so far, and I just realize I've filled up on E10 from Gull. 

Ahh well, next tank back to 98 anyway

  • Like 1
Link to comment
Share on other sites

I haven't noticed any significant change between  95 and 98 gull.  Thats  same tune, no o2 compensation.    But.. i did spend some time on the dyno the other day and found a few places at low throttle where it liked a little more timing.  so that could have been an advantage when filling with 98 gull, evening things out a little.    A lot of the time up here 98 gull is actually a little cheaper than 95

Along with finding a few small things in the tune.  put some slightly less tar in for oil, and the plastics back on under the front of car.     and yeah 7.2L per 100k which worse than normal haha.   but that was already 100k's in, then tuning on dyno on that tank.  see how the next tank goes, but  give up.

Although i did forget to see what difference it made with vvt on/off  at cruise

 

Link to comment
Share on other sites

On 10/03/2022 at 12:04, Sunbeam said:

This is harder than I thought, as my strong sense of shame is battling with my scientific curiosity. I have made the eco bar go into the red twice already.

So, I pulled the pin after 380km. It’s just too embarrassing. Anyway driving like an economy anorak netted 4.2l/100km. One does feel smug though, putting $39 of gas in the tank for 380km. Now I can get back to driving like normal.

  • Like 2
  • Thanks 1
Link to comment
Share on other sites

On 20/03/2022 at 22:29, cletus said:

Has anyone done any accurate testing on mileage vs cost on 91 vs 95 vs 98 on an engine that could run happily on any of them?

 

I wonder could the extra cost of 98 or 95 be outweighed by mileage gained by the ability to have more timing, or is the price difference too much to be worthwhile 

AA did a test with a Maxima years ago. Got better economy on higher octane, but not enough to offset the extra cost. 

  • Like 1
Link to comment
Share on other sites

  • 2 weeks later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...