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What brand and grade of gas are you using? 87 or higher?

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  #301  
Old 02-16-2018 | 09:31 PM
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Thumbs up Why Over Octane?

Why use higher Octane Gas than you need? My 2015 EX runs great on 87. Oh and so does my 2007 Honda Ruckus.
 
  #302  
Old 02-16-2018 | 09:37 PM
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Originally Posted by 2Rismo2
Ok I think I remember seeing that before. Not sure if the problem is emblematic as you'd be seeing it reported much more broadly. Looks like that person had early problems with it showing up at 28k kilometers. So maybe there car had a manufacturing defect from the get go?

Like I said, I'm at 53k and have been using whatever cheapest gas I can find. Lately it's been Murphy's because it's the closest and cheapest station near me. I also change my oil at around 9k because that's around 10% oil life. Been using full synthetic 0w20 from Quaker state or Pennzoil. So far so good.

Other vehicle is an 2004 4 runner and still put 10w40 conventional as that's what it calls for. Also use 87 in it and that vehicle has 154k miles on it.

If people want to use higher octane gas in there car because that makes them feel better, more power to them.
Originally Posted by Chitown Fit
Why use higher Octane Gas than you need? My 2015 EX runs great on 87. Oh and so does my 2007 Honda Ruckus.

No offense but basic knowledge of mechanical compression tells me otherwise, and testing timing advancement based on octane proves it. What may feel great to you, could feel like crap to me, because i perceive engine behavior in ways that you may not. For instance a tiny knock or ping may go unnoticed by the average, daily commuter folk. But for us engineering folk, its painful to hear even a tiny ping, that most people don't even notice or assume is just a normal part of the engines normal noise and behavior.
 
  #303  
Old 02-16-2018 | 10:16 PM
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Thumbs up No Offense And I Hope None Taken.

Originally Posted by Cichlid_visuals
No offense but basic knowledge of mechanical compression tells me otherwise, and testing timing advancement based on octane proves it. What may feel great to you, could feel like crap to me, because i perceive engine behavior in ways that you may not. For instance a tiny knock or ping may go unnoticed by the average, daily commuter folk. But for us engineering folk, its painful to hear even a tiny ping, that most people don't even notice or assume is just a normal part of the engines normal noise and behavior.



Even Medical Doctors have been known to mis-diagnose patients.
 
  #304  
Old 02-16-2018 | 10:21 PM
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Originally Posted by Chitown Fit
Even Medical Doctors have been known to mis-diagnose patients.
Hard to argue with proven timing advancement in response to higher octane, and the fact that in many parts of the world where the car is sold, 91 octane is the lowest available, and on the opposing end of the scale (mexico) honda reccomends no lower than 91 octane for the l15b1 even though mexico has the same octane grading system as the United states. I think it boils down to americans wanting to put cheap gas in a cheap car, regardless if the engine likes it or not. In Mexico this is not a cheap car, and people tend to treat them better and honda recognises the demographic difference.
 

Last edited by Cichlid_visuals; 02-16-2018 at 10:24 PM.
  #305  
Old 02-16-2018 | 10:44 PM
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Originally Posted by Cichlid_visuals
Im almost 100 percent certain this is a combination of low quality gasoline, overly long oil change intervals (yes 9k via the maintenance minder is TOO LONG), and mediocre oil with weak detergents to begin with. Most people who own these cars seem to treat them this way. Just because its an economic car doesnt mean the engine isn't sophisticated and requires premium fuel, honda just didnt want to tell people you need to run premium gas in their lowest cost car to achieve its maximum performance and efficiency.
But if I don't let the maintenance minder pop up, the car doesn't notify me when the other services are due...
 
  #306  
Old 02-16-2018 | 10:54 PM
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Question U.S. Hondas vs. The Rest Of The World.

Originally Posted by Cichlid_visuals
Hard to argue with proven timing advancement in response to higher octane, and the fact that in many parts of the world where the car is sold, 91 octane is the lowest available, and on the opposing end of the scale (mexico) honda reccomends no lower than 91 octane for the l15b1 even though mexico has the same octane grading system as the United states. I think it boils down to americans wanting to put cheap gas in a cheap car, regardless if the engine likes it or not. In Mexico this is not a cheap car, and people tend to treat them better and honda recognises the demographic difference.

Like you said, "Honda Recognizes The Demographic Difference." Is it possible that Hondas for the Mexico Market differ from the Hondas for the U.S. Market? Hence the 91 Octane rating for Gas in Mexico for Hondas according to your statement.
 
  #307  
Old 02-16-2018 | 11:03 PM
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Originally Posted by Chitown Fit
Like you said, "Honda Recognizes The Demographic Difference." Is it possible that Hondas for the Mexico Market differ from the Hondas for the U.S. Market? Hence the 91 Octane rating for Gas in Mexico for Hondas according to your statement.
Actually the l15b1 is a honda "global" engine platform and is mechanically identical in all parts of the world its sold. Even new Zealand, wich is where i got the 3d rendered animation.
 
  #308  
Old 02-16-2018 | 11:05 PM
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Originally Posted by Gekisen
But if I don't let the maintenance minder pop up, the car doesn't notify me when the other services are due...

The maintenance minder will pop up for all other things regardless of oil change interval, resetting the oil change interval shouldnt mess with the interval for transmission fluid etc.
 
  #309  
Old 02-16-2018 | 11:45 PM
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Question You Might Want To Re-Think That.

Originally Posted by Cichlid_visuals
Actually the l15b1 is a honda "global" engine platform and is mechanically identical in all parts of the world its sold. Even new Zealand, wich is where i got the 3d rendered animation.



In the Philippines the Fit is known as the Jazz. The Jazz motors use the 1.5 V Tech Motors. Are these motors different than the Earth Dreams motors here in the U.S.?
 
  #310  
Old 02-16-2018 | 11:49 PM
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Originally Posted by Chitown Fit
In the Philippines the Fit is known as the Jazz. The Jazz motors use the 1.5 V Tech Motors. Are these motors different than the Earth Dreams motors here in the U.S.?
I dont believe the Philippines, indonesia, malaysia and few other asian countries got the l15b or 6 speed manual. They still have the single cam L seires in the gk jazz, even their "RS" models. Shame.

edit:

Add australia to that list. Pretty crappy. Japan however does get the l15b and have great things to say about it, it has a better rod ratio than a b18c, and responds great to software tuning with higher octane fuel.
 

Last edited by Cichlid_visuals; 02-16-2018 at 11:53 PM.
  #311  
Old 02-17-2018 | 12:14 AM
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Post Like I Said;

Originally Posted by Cichlid_visuals
I dont believe the Philippines, indonesia, malaysia and few other asian countries got the l15b or 6 speed manual. They still have the single cam L seires in the gk jazz, even their "RS" models. Shame.

edit:

Add australia to that list. Pretty crappy. Japan however does get the l15b and have great things to say about it, it has a better rod ratio than a b18c, and responds great to software tuning with higher octane fuel.

Even Medical Doctors have been known to mis-diagnose patients.
 
  #312  
Old 02-17-2018 | 12:15 AM
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Originally Posted by Cichlid_visuals
Japan however does get the l15b and have great things to say about it, it has a better rod ratio than a b18c, and responds great to software tuning with higher octane fuel.
on a NA engine wat do you net, 15hp at the crank? comparable to driving the same car on a cold day vs a warm day?
 
  #313  
Old 02-17-2018 | 01:15 AM
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Originally Posted by kenchan
on a NA engine wat do you net, 15hp at the crank? comparable to driving the same car on a cold day vs a warm day?

They are successfully bringing these engines to 100hp per litre with very little modifacation, the majority of power gained is through tuning and yes about 15-20 crank horsepower increase. Thats quite a substantial gain based on mapping alone especially for an NA 1500cc engine. combine that with higher duration camshafts and stiffer valve springs and we can easily be looking at 170hp/8k rpm l15b, and to me thats very intriguing.
 
  #314  
Old 02-17-2018 | 01:21 AM
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Originally Posted by Chitown Fit
Even Medical Doctors have been known to mis-diagnose patients.
yes they do, but i clearly said its hondas global engine platform, and its identical everywhere its sold, specifically meaning the l15b1 ENGINE, not the gk5/gk3 or gp5/gp3 (fit/jazz) chassis in general. And indeed the l15b1 is identical everywhere its sold. The l15A and l15Z are totally different engines. So in essence, you are making an improper diagnoses by repeating that, dr. chitown.
 

Last edited by Cichlid_visuals; 02-17-2018 at 02:14 AM.
  #315  
Old 02-17-2018 | 01:45 AM
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Post You're Wrong Again.

If it's a global engine platform then every Honda Fit / Jazz in the world would have the same engine. Not a derivative. I'm not a self proclaimed Honda Fit / Jazz expert like you. From what I've read online I know the Fit / Jazz motors are different in the Asian markets than the ones here in the U.S.
 
  #316  
Old 02-17-2018 | 01:49 AM
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Originally Posted by Chitown Fit
If it's a global engine platform then every Honda Fit / Jazz in the world would have the same engine. Not a derivative. I'm not a self proclaimed Honda Fit / Jazz expert like you. From what I've read online I know the Fit / Jazz motors are different in the Asian markets than the ones here in the U.S.

Its global ENGINE platform. Not global VEHICLE platform 😑 do u know how many different vehicles use the L15B???? NOT JUST FIT AND JAZZ BUDDY. I wasnt tryna argue with u dude, but u keep setting yourself up to get schooled. Its ok, you don't catch on as quickly as id like, you are still cool. They put l15b in cars we dont even get in the states, like the city, the freed, the mobilio and the vezel for a few examples. Thats why i said global ENGINE specifically, wich is why its referred to as an earth dreams motor and l15A and other variants are not. Mainly aimed at 1st world countries, honda wants its global vision to consist of all direct injected engines, because they are the most efficient, obviously. Not all parts of the world have the quality of gasoline the earth dreams motors demand, so they simply do not get them.
 

Last edited by Cichlid_visuals; 02-17-2018 at 03:44 AM.
  #317  
Old 02-17-2018 | 02:21 AM
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  1. ​​​​​​Also, im no jazz/FIT expert, in fact im fairly new to them. This is more my area of expertise, 90s high compression 200hp 1600cc goodness. Built this car from a bare shell, and its legally registered in california with the swap. Try running any LESS than 91 in this thing 😂 but guess what, its compression ratio is actually slightly LOWER than the l15b1
 

Last edited by Cichlid_visuals; 02-17-2018 at 02:41 AM.
  #318  
Old 02-17-2018 | 02:34 AM
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And here's my '15 lx 6mt (yes, also on advans)





 
  #319  
Old 02-17-2018 | 10:09 AM
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Like I said if people want to put higher than recommended octane in their vehicles they are welcome to it. I've driven several vehicles to 150k+ miles using 87 and I'll continue to do so.

Honda has no incentive to recommending the razor edge of effectiveness in their vehicles. They have built their image on reliable cars and to put that at risk over an octane rating isn't worth it. As far as what cars in Mexico or other markets are being recommended, that's for that market. No idea what quality fuel is being dispensed. I think Mexico Honda also recommend 5w20 oil. No thanks I'll stick to 0w20.

At this point there are hundreds of thousands of usdm fit in circulation. If this was a bigger problem there would be lots of cases reported and follow up with a class action lawsuits. I've only seen that one thread you pointed out and a few injector related issues I've seen on the forums. There will always be those cars/components built substandard in an assembly line.

I'm averaging about 20k miles a year and so far so good. I remember a member who used his car for delivery and had already done over 100k before he got rid of it last year. That's a good sign this engine can hit high mileage with GDI.
 
  #320  
Old 02-17-2018 | 11:21 AM
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Originally Posted by Cichlid_visuals
They are successfully bringing these engines to 100hp per litre with very little modifacation, the majority of power gained is through tuning and yes about 15-20 crank horsepower increase. Thats quite a substantial gain based on mapping alone especially for an NA 1500cc engine. combine that with higher duration camshafts and stiffer valve springs and we can easily be looking at 170hp/8k rpm l15b, and to me thats very intriguing.
humm... how about torque? wat kind of gains are you expecting?
 


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