Before & After PC3 - Sparkplugs and Fuel Pressure Regulator Check - Wrist Twisters
 
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post #1 of 18 Old 01-31-2016, 10:28 PM Thread Starter
The 35.5 MPG 919
 
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Before & After PC3 - Sparkplugs and Fuel Pressure Regulator Check

My PC3 is being delivered soon, and I am trying to document a bit of a before and after once I get it hooked up and running to compare. For what it's worth, I currently get around 6.6-6.9 L/100KM or 35.5 US MPG.

First thing's first...

Is what I have circled below the vacuum line for the fuel pressure regulator? I've tried removing it from the regulator but the damn thing won't come off! Do I just need to pull on it harder?




Here is a before picture of my number 1 spark plug with and without flash. All of the plugs have done just under 10,000kms and will be replaced with the PC3 arrival:






Once I get everything hooked up and running, I'll post an update below.

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post #2 of 18 Old 01-31-2016, 10:44 PM Thread Starter
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From what I've read online and seen, my plugs are definitely evidence of the bike running rich. The MPG also points to this too.


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post #3 of 18 Old 02-01-2016, 02:10 AM
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I think you might have lean and optimal mixed up^^.

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post #4 of 18 Old 02-01-2016, 03:24 AM
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Quote:
Originally Posted by rmb View Post
I think you might have lean and optimal mixed up^^.
+1, I was going to say the same thing.

Just wondering, what kind of MPG are you PCIII people getting? I've heard 40 is common. I'm getting in the 30 range myself, but that's all city/stop-n-go short runs. I think 35 was mixed freeway, longer runs.

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post #5 of 18 Old 02-01-2016, 05:30 AM
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I think that's the fuel side of the FPR.

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post #6 of 18 Old 03-01-2016, 01:25 AM Thread Starter
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Well I've had 3 tanks worth of gas through the bike since I installed the PC3 and my fuel consumption has....increased?

Tank 1 - Prior to PC3 install: 6.84 L/100KM

Tank 2 - First Map - Came with the PC3, tuned for 2 Brother's dual exhaust: 7.65 L/100km
Tank 3 - Second Map - mw919mori4 map: 8.05 L/100km

Admittedly, all 3 tanks were commuting rather than open road speeds but still, an increase in consumption regardless.

I've also inherited the cold start issue with the PC3; the previous owner of the PC3 had a cold start issue.

I'm going to have a play with different maps this weekend.

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post #7 of 18 Old 03-01-2016, 08:35 AM
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Quote:
Originally Posted by KarlJay View Post

Just wondering, what kind of MPG are you PCIII people getting?
I get 40+

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post #8 of 18 Old 03-01-2016, 09:18 AM
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Quote:
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I get 40+
Anywhere from 40 to 58 mpg. If I spend any amount of time above 4k rpms, I have a drop in mpg. Usually average around 45-48 at 75 mph, that's about 4700 rpms. If I spend any time above 6-6.5k rpms. My mpg drops significantly lol.

When I was tracking spending the full day above 6k rpms and hitting red line all day long, I got less than 30 mpg. My calculation was off, but I wouldn't be surprised if I got 25mpg or less.

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post #9 of 18 Old 03-01-2016, 01:19 PM
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Either way you really cannot tell anything about anything on a fuel injected bike by looking at the plugs outside of them being completely fouled and dripping wet.

Modern fuel injection allows for the engines to run outside of conventional parameters we learned from carbs. You can force the A/F mixture into just about any ratio you want based on a myriad of factors so leave the plug readings to the 2-Stroke guys at the race track and use a Lambda sensor if you want to know the truth about your fuel curve as you won't learn anything outside the blatantly obvious by just observation of the spark plugs.

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post #10 of 18 Old 03-01-2016, 03:31 PM
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I had a cold start issue with my niner too after the PC3, I think increasing the choke and adding a map made for your sea level will fix it but my consumption increased about %3-4 percent after the PC3, your readings are little of the chart at the moment.

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post #11 of 18 Old 03-01-2016, 07:45 PM
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Seriously, i thought we solved this by the ambient air temp reading and supplying a constant voltage or something. Didnt someone also say holding the starter and turning key instead worked instead...

Or...???

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post #12 of 18 Old 03-01-2016, 08:03 PM Thread Starter
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Quote:
Originally Posted by velodesign View Post
Seriously, i thought we solved this by the ambient air temp reading and supplying a constant voltage or something. Didnt someone also say holding the starter and turning key instead worked instead...

Or...???
I'm not so much bothered by the cold start issue - I knew about it before buying the PC3.

More so updated the thread as my fuel consumption has increased when nearly everywhere I've read has said it should decrease.

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post #13 of 18 Old 03-01-2016, 08:25 PM
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Oh...ok. sorry. I didnt read the whole thing, just saw us circling back to the cold start stuff...carry on!

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post #14 of 18 Old 03-01-2016, 09:40 PM Thread Starter
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My fix for the cold start issue is to hold down the ignition button as the fuel pump is making its noise after you turn the key. Worked 100% so far.

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post #15 of 18 Old 03-02-2016, 08:47 PM
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IMHO, most performance mods will decrease your real world fuel economy, simply because in the back of your head is the thought: I spent money for better performance, and I'm here to collect! Like my ol man used to say: it takes oats to feed them horses. I used to be the guy that was always monitoring his mpgs. But unless I think there is something wrong, I stopped paying attention. There is much more satisfaction in running a vehicle like some one else is buying the fuel. I've never had a Honda that didn't like to rev.

What is the cold start issue you guys speak of?

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post #16 of 18 Old 03-02-2016, 08:51 PM Thread Starter
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Quote:
Originally Posted by Sniper View Post
What is the cold start issue you guys speak of?
With a Power Commander installed, it can take 5 or 6 goes of the starter button for the bike to start. Itll start for a second then die the first 5 or 6 times.

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post #17 of 18 Old 03-03-2016, 08:20 AM
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Quote:
Originally Posted by Sniper View Post
IMHO, most performance mods will decrease your real world fuel economy, simply because in the back of your head is the thought: I spent money for better performance, and I'm here to collect! Like my ol man used to say: it takes oats to feed them horses. I used to be the guy that was always monitoring his mpgs. But unless I think there is something wrong, I stopped paying attention. There is much more satisfaction in running a vehicle like some one else is buying the fuel. I've never had a Honda that didn't like to rev.

What is the cold start issue you guys speak of?
In my experience when the bike is finally tuned properly and feels like it is attached to my wrist with that crispy, instant throttle response instead of the flabby rubber band feeling of the OEM settings I start playing with it more. It becomes a lot more fun to run up the revs just leaving a stoplight or be a little less consistent with my speed by rolling on the throttle more often for no real reason other than I can because it feels good. That is when I see my mileage start going to shit. I mean if I have to work to do a wheelie then I'm not really going to make that effort, but if I can loft the front almost effortlessly just by rolling on the throttle with the newfound linear delivery that the PCIII gave me then I find myself doing those wheelies a lot more often.

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post #18 of 18 Old 03-03-2016, 02:56 PM
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What is the cold start issue you guys speak of?

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