what grade of gas do you give to your fit?
#361
And as far as S&Ds Ethanol blending, I meant to address that last bit seperately, and he is correct, ethanol does like higher IATs for fuel economy purposes, and it can release energy more efficiently, but there is a sweet spot for it.
Its for the same reason that on cold days when you go to start an E85 engine, the alcohol might not catch. At least not on the first few tries.
Higher temps = better atomization = more complete, efficient combustion
Last edited by DiamondStarMonsters; 01-16-2011 at 09:05 PM.
#362
I found a dyno test and even though its top end cars, remember Honda is Japan and also has 102 ron fuels. http://www.tesco.com/Momentum99/file...uel-Report.pdf , Thorney Motorsport - Fuel Test Results Update
#363
I found a dyno test and even though its top end cars, remember Honda is Japan and also has 102 ron fuels. http://www.tesco.com/Momentum99/file...uel-Report.pdf , Thorney Motorsport - Fuel Test Results Update
#365
#367
You are right on what Hondata said, but I knew it as minimum brake torque and this article say max. brake torque General Air Fuel Ratio Effect on Engine Performance. No wonder I am confused. I do know it the least amount of timing needed for max efficiency, because of higher efficiency's of the motor.
Last edited by SilverBullet; 01-18-2011 at 10:46 PM.
#368
Though on a hot day on poor fuel it pegs 9:1 @ WOT in certain load cells because of our compression ratio.
For those who have the option to tune their car, and don't have to worry about emissions but want excellent mileage you can burn pure gasoline as lean as 15.4:1AFRs under idle and cruise. But OE tunes don't often allows this anymore because you would fail emissions through excess NOx among other things when burning that lean and hot.
So often the leanest you'll see is stoich or Lambda 1.0v on a narrow band oxygen sensor on an OBD2.
What sort of timing and AFR is everyone seeing under idle and cruise? I know some of you guys have scan tools!
Last time it was on the Fit it was seeing as much as 43* under cruise and 25* under WOT. But that was on Shell E10 93oct.. I have since switched to BP 93 as an experiment on a tip from SB. So far, it feels like there is a tangible difference on cold starts which is expected because there is no ethanol in BP 93. I think I get slightly more response and pull at the top of 2nd and 3rd, but I won't know for sure until I have run a couple more tanks through.
I used my OBD2 datalogger which is not as nice as everyones scan gauge but gives me every single thing going on in the ECU, But no live read out read out.. Its only about the size of a tangerine after all.
I have to plug the logger into a computer afterwards and check it out but after a while of looking at logs you can actually see what the car is doing and what the driver is doing.
#369
The gas station I go to must of got fresh premium, MPG is way up. My car runs 27 degrees at WOT and runs 32 around 60 mph. It never goes higher than 45 degrees timing. DSM if you look at Tesco 99 msds sheet, I am sure its similar to Amoco ultimate 93. I just wish that info was easier to get that info rather than going to other countries websites to get it. The scan gauge doesn't give fuel trims,or A/F ratio for Honda like on some cars. The fuel trims worked on the van but not the O2. I might have to reprogram the X gauges and they might work on this car.
#370
I found a dyno test and even though its top end cars, remember Honda is Japan and also has 102 ron fuels. http://www.tesco.com/Momentum99/file...uel-Report.pdf , Thorney Motorsport - Fuel Test Results Update
#371
Then how do you buy things? All company's do there own tests. Gasoline is easy to see the results with out going broke.
#373
Get a scangauge or ultra gauge and check out how the ECU compensates by pulling ignition timing and requires a larger % of throttle to be opened to maintain the same speed when using 87 octane instead of 93 before you form an opinion... It does make a greater difference in improving the power of a boosted engine and water / methanol injection makes even more... If you don't drive in a rather sporting manner, have to climb steep hills, accelerate hard to comfortably get on a freeway you may do fine using 87, but if you want your car to have a bit more power the 2 easiest things you can do is to use 93 or higher octane fuel and colder heat range spark plugs... A lot of people that had the same opinion as you have been open minded enough to use a few tanks of 93 octane to see for themselves and are still using using it because they have and opinion based on their own personal experiences.
#374
Exactly- if I feel I want to test different kinds of gasoline, I can do it myself, or even get a "non-partisan" opinion from users of this site. I'm just saying that, when someone with an obvious interest conducts a study, it should always be read with a critical eye.
#375
Get a scangauge or ultra gauge and check out how the ECU compensates by pulling ignition timing and requires a larger % of throttle to be opened to maintain the same speed when using 87 octane instead of 93 before you form an opinion... It does make a greater difference in improving the power of a boosted engine and water / methanol injection makes even more... If you don't drive in a rather sporting manner, have to climb steep hills, accelerate hard to comfortably get on a freeway you may do fine using 87, but if you want your car to have a bit more power the 2 easiest things you can do is to use 93 or higher octane fuel and colder heat range spark plugs... A lot of people that had the same opinion as you have been open minded enough to use a few tanks of 93 octane to see for themselves and are still using using it because they have and opinion based on their own personal experiences.
If your happy using regular and getting in upper 30s in mpg then premium wont make a big difference. There is a difference between brands and types, so experimenting till you find what is best. In Japan they recommend 95ron octane which is 91 here in the states and Regular in the 80s was 89 octane and then they had unleaded.
#377
If you don't drive in a rather sporting manner, have to climb steep hills, accelerate hard to comfortably get on a freeway you may do fine using 87, but if you want your car to have a bit more power the 2 easiest things you can do is to use 93 or higher octane fuel and colder heat range spark plugs...
#378
No you dont have to, Ive been switching back and forth with mid grade to premium with no side affects. If you go from premium to regular on a empty tank I would do a relearn but its not necessary with the new ecus as long a you dont drive the car hard.
#379
My shifts are improved with an automatic trans on premium over regular.