XSR 700 Forums banner

1 - 17 of 17 Posts

·
Registered
Joined
·
7 Posts
Discussion Starter #1
After I had my ECU flashed it ran rich, really rich. Smelled horrible to the point where it was almost un bearable when running. Thats when the MPG kept dropping and dropping and finally stayed at about 29MPG. I have since had it dynotuned where they tuned the fuel down a bit however its only gone up 1mpg. The shop recently replaced the MAP sensor and said it was faulty. I filled the gas tank and decided I would ride very conservatively to see what kind of MPG "I could get" if I don't ride so aggressively. I'm currently at 2 bars on my fuel guage with 90 miles on this tank of gas. I predict that I will get to about 130-140miles until the tank is practically empty. I'm concerned that I've got a bad piston ring leaking fuel down to the oil pan OR bad valve seals. With riding the bike hard on a tune that was way too rich for about 1,000 miles I wonder if that could have damaged one of the internals. I've had it to the shop on multiple occasions and still no solid answers...
 

·
Registered
Joined
·
341 Posts
Just for my understanding, you flashed your ECU, or let it flash. The result was not that that good, so you put your XSR on a dynamometer and the ECU was flashed again?

Later your air pressure sensor was changed due to being faulty?

My initial idea is, let your ECU re-flash to standard. The bad thing is, that I up to now did not see any good ECU flash. Most flash professionals only add fuel. The more money they ask for, the more fuel points they may edit. But as long as they do not edit the ignition point and the ignition curve, it is some worthless ECU flash, it is just adding more fuel and ripping your money.
 

·
Registered
Joined
·
341 Posts
[..] I'm concerned that I've got a bad piston ring leaking fuel down to the oil pan OR bad valve seals. With riding the bike hard on a tune that was way too rich for about 1,000 miles I wonder if that could have damaged one of the internals. I've had it to the shop on multiple occasions and still no solid answers...

If there is fuel in the oil pan, you will see it by the high up oil level. Riding for a while will evaporate the fuel. A damaged engine by the fuel, you will see by oil consumption, where normally is no.
So if you have to fill oil between the two services, you have a slightly higher oil consumption. But I do not think so.
 

·
Registered
Joined
·
460 Posts
Curious, who did the flash? I know in the FZ group there are a few companies with a reputation for good work. I know one is close to me - Hord Racing.

This is one reason why I went for an exhaust that required no reflash. I was after tone not volume, and looks. If I wanted 100 hp I would have spent an extra grand for a 900 - but then that is me and my methods. I don't plan any reflashing of anything. I just don't want to deal with any of it.
 

·
Registered
Joined
·
166 Posts
The questions you're asking could be given insight by sending your engine oil out for analysis.

When bike is very new report will comment on trace amounts of things like fuel, maybe titanium from valve train or bedding rings.

A settled in engine (if you had a report to compare it to from same bike before break-in) would show relatively speaking much less fuel contaminate in the oil. And (I think) shows little trace metals, unless something is wrong. The report will comment stuff they suspect is not right about motor. Maybe you want to send this one out for science to take a look. I've never done it, but it's valuable stuff
 

·
Super Moderator
Joined
·
669 Posts
And the learning experience here? If it ain't broke, don't fix it!
Beware performance enhancing ECU flashes.

I'd start by trying to set the ECU back to normal and hope the rest comes into line. MPG should be 50+ (imp) giving a full tank range of about 175 miles of 'normal' riding.

Good luck!
 

·
Registered
Joined
·
7 Posts
Discussion Starter #7
Curious, who did the flash? I know in the FZ group there are a few companies with a reputation for good work. I know one is close to me - Hord Racing.

This is one reason why I went for an exhaust that required no reflash. I was after tone not volume, and looks. If I wanted 100 hp I would have spent an extra grand for a 900 - but then that is me and my methods. I don't plan any reflashing of anything. I just don't want to deal with any of it.
I went to a place called 2 wheel dynoworks (2WDW) that also has a very good reputation on the forums. Whats even weirder is that I know of a couple guys that have sent their ECU in to them on their own XSR's and are still getting normal fuel consumption around 40-50mpg.
 

·
Registered
Joined
·
7 Posts
Discussion Starter #8
And the learning experience here? If it ain't broke, don't fix it!
Beware performance enhancing ECU flashes.

I'd start by trying to set the ECU back to normal and hope the rest comes into line. MPG should be 50+ (imp) giving a full tank range of about 175 miles of 'normal' riding.

Good luck!
I mostly just wanted to eliminate the fuel cut on deceleration for better throttle response and less of a jerk when letting off the throttle. I know of a couple guys that have XSR's and have used the same place for their flash and are still getting normal fuel consumption.
 

·
Registered
Joined
·
166 Posts
Just a reality check, go to fz07.org and read the thread(s) on 2wdw flash. There is consistent positive results reported from the Seattle guys flash for this engine. They have flashed, who knows, 500 or more of this bike, and it is overwhelming positive.

And yet, there are a small percent of posters not happy, some because mpg but other reasons as well.

My bike was lean in stock form, a 2wdw flash for Yoshimura R77 improved fueling and power before I installed the Yosh pipe. I ran a week on the R77 flash and stock exhaust, and my bike was more powerful and fueling at all rpms was positive, the fuel cutoff fix was a bonus.

My point being statistics favor the flash from 2wdw. Even so, some bike owners post it s$cks because for them it does. Anamolies exist in all things
 

·
Registered
Joined
·
7 Posts
Discussion Starter #10
I'm not blaming 2WDW at all as I know they're very reputable. I live about 15min from the shop and am actually friends with the owner who has been working hard with me to figure this whole thing out. We have even installed an active tune o2 sensor kit on the exhaust. Thats why this is so confusing, it's not like some smoke and mirrors inexperienced shop thru a random flash on the ECU. It was done by the best ECU flashers around. Thats what makes me think something is messed up with the actual motor...
 

·
Registered
Joined
·
585 Posts
It's definitely way too rich as you know and if you think it was so rich that it may have caused some internal damage, the first place I'd look would be rings and valve guides. Have some one take a good compression and leak down test. If those are good, I wouldn't sweat the internal stuff but I'd definitely try to get back to stock fueling and start over.
 

·
Registered
Joined
·
460 Posts
This just remindedd me of something I tell my students when something screws up in programming and coding when I teach those classes. Sometimes they have done everything right, coding is correct, logic is there, but it just doesn't work.

Computers are a bunch of electronic switches. All it takes is one little electronic hiccup and it won't do what it's supposed to do. Everything was done just right, but it doesn't work the way it should. Truly the example of "shit happens".

In other words everything is normally plug and play, but if the computer burps your program is hosed. Reboot time!

Back to original and reflash again. I'd think 2WDW should be able to fix things for you.
 

·
Registered
Joined
·
341 Posts
Nice to know is, that you may reset all resetable displays in the speedo, especially those with average consumption or mileage. Just to be sure that you start from new. As well to be noticed, that a brusque riding on the first kilometers may influence the fuel trip mileage in a different way than starting slow and riding hard close to the signal light of the fuel gauge.

Anyhow, better to write down actually your riding distance and calculate by hand your MPG or gallons per mile. This is much more accurate.


I know it is difficult with those forums and it is complicated to tell always all the story already at the first attempt. So I just ask, are there other mods done to your bike?
Generally, if something is messed up with your engine, it is as I said already above. Fuel in the oil pan, you will see through the oil-level glass, when it is high up suddenly. Other defects you will see by a higher oil consumption. But no damage at the engine will increase your fuel consumption.

If all manual distance and fuel writting shows still high fuel consumption, it is the ECU flash. You know the people there, hope they will flash back in a rush.
Then learn to use the throttle. Against those tuning specialists, there is no real jerky throttle. Yamaha only programmed the MT-Series (Dark side of Japan) quite hard on throttle. A very easy thingy to learn and get used of it.
The other way round, fuel cut off you find at every injected engine. It is nothing special and depending on the number of cylinders, you have a more or less engine brake. But everybody knows, to decelerate a little, you do not need to fully close the throttle. To keep your speed, there is no need to roll on and off the throttle, just hold it. This said brings me to the dark side of tuners, which is to blame. They sell a product for something which is not a problem. Or said, if you do not know better, you have to believe and follow the Pied Piper.
 

·
Registered
Joined
·
287 Posts
maybe a sensor is toast, but you would get error code. are you running stock intake and air filter?
 

·
Registered
Joined
·
15 Posts
Something to also consider, I can see you're in the states so things might be a little chilly.
I think that on a stock ECU if the air temperature is lower, it will pump more fuel in.
So I'm using the SC Projects AFM which has an impact on this
"This added unit changes the parameters related to temperature- air sensors, so that the motorbike original electronics changes carburetion with injection time and advance which are different from the original"
Anyway, consider the outside air temperature having an impact on fuel consumption?
 
1 - 17 of 17 Posts
Top