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more power; bigger fuel injector
Topic Started: Dec 4 2016, 11:42 PM (567 Views)
tazome
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I had my fuel injector rebuilt along with the engine , i had it enlarged to having a higher fuel flow rate over the factory an what a differance it makes, but i dont recomend it if your running a stock tired engine . dr injector of sacramento ca did the modifcation if interested . gas mileage is 27 to 40 highway but its better than a new car
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freegeo
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Are you running the stock ECM? Just rebuilding a engine alone and getting the clearances right can make a big difference.
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LesCrapp
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Legend

LoL! the gurus will be here to explain this one again I'm sure...
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myredvert
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myredvert

Quote:
 
I had my fuel injector rebuilt along with the engine , i had it enlarged to having a higher fuel flow rate over the factory an what a differance it makes
Quote:
 
LoL! the gurus will be here to explain this one again I'm sure...
I would love it if someone would explain how the ECM was convinced to reduce the scheduled fuel as necessary to maintain stoich while in Closed Loop operation, or how you can get more power than the best power air:fuel ratio, which is roughly what the ECM schedules fuel for while out of closed loop and in the power enrichment mode?

And where is the additional intake airflow coming from to mix with all this fuel in order to turn it into more power? :hmm
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snowfish
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Basic GearHead

I think he means had the throttle body bored like here. :news

http://maxbore.com/index.html

Posted Image

Posted Image

Works very well on snowmobiles, ATV's, PWC's, etc. ^o) My buddies 1000cc ProStock SkiDoo has bored throttle bodies.
148+mph in 1000ft.
Even on the 600cc Improved class sled, running the stock ECU, very noticeable gains have been achieved.

If it works for those, why not our Metro's? :hmm I have considered this myself for my next refresh. :gamerz
I have until March to make the decision. :cheers
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freegeo
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Does the snowmobile have a O2 sensor?
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snowfish
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freegeo
Dec 5 2016, 11:35 AM
Does the snowmobile have a O2 sensor?
Yes. ^o)
However many current flashes have deleted the O2. Like the 2017 Yamaha Viper and Sidewinder. Straight mapping, no 02 sensor. Not sure how that works. :hmm Just know it does. :nfs

You're thinking our Metro's O2 sensor will negate any gains that boring the TBI would do? :dunno
Edited by snowfish, Dec 5 2016, 06:30 PM.
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cwatkin


I don't fully understand the "straight mapping" but suspect it is a pre-programmed input based on the throttle position sensor, etc. to simulate a carburetor. I suspect this would be a tad rich to be conservative and not run the thing lean. I suspect that is very important on these cars with their tendency to toast exhaust valves.

I know there are some turbo mods for these cars and would suspect something similar must be done to accomodate the turbo. How is that done? I suspect it would be similar.

Conor
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nineoneandblue
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myredvert
Dec 5 2016, 09:57 AM


And where is the additional intake airflow coming from to mix with all this fuel in order to turn it into more power? :hmm
With one of these of course!........ http://www.ebay.com/itm/like/182372500485?lpid=82&chn=ps&ul_noapp=true :D
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freegeo
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nineoneandblue
Dec 5 2016, 06:45 PM
myredvert
Dec 5 2016, 09:57 AM


And where is the additional intake airflow coming from to mix with all this fuel in order to turn it into more power? :hmm
With one of these of course!........ http://www.ebay.com/itm/like/182372500485?lpid=82&chn=ps&ul_noapp=true :D
Lol! Myredvert will love that.
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freegeo
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snowfish
Dec 5 2016, 11:48 AM
freegeo
Dec 5 2016, 11:35 AM
Does the snowmobile have a O2 sensor?
Yes. ^o)
However many current flashes have deleted the O2. Like the 2017 Yamaha Viper and Sidewinder. Straight mapping, no 02 sensor. Not sure how that works. :hmm Just know it does. :nfs

You're thinking our Metro's O2 sensor will negate any gains that boring the TBI would do? :dunno
The O2 sensor does nothing but send a signal to the ecm/pcm. The ecm/pcm does the adjusting of the AFR with stft as long as it is in closed loop. The ecm/pcm can't adjust air only fuel.
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LesCrapp
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Look up Speed density vs. Mass airflow...
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snowfish
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cwatkin
Dec 5 2016, 06:34 PM
I don't fully understand the "straight mapping" but suspect it is a pre-programmed..............

I know there are some turbo mods for these cars and would suspect something similar must be done to accommodate the turbo.
Straight mapping was a poor term. :smackface Without going too far down this bunny trail, :tumbleweed the latest ecu program, and re-flash for 2014 to current 1049cc Yamaha sleds, has eliminated the O2 sensor. BUT still incorporates all of the other sensors including EGT exhaust gas temperature, and AFR air fuel ratio sensors on the factory turbo models. :news Someone way smarter than me figured all this out. :'(
Quote:
 
The O2 sensor does nothing but send a signal to the ecm/pcm. The ecm/pcm does the adjusting of the AFR with stft as long as it is in closed loop. The ecm/pcm can't adjust air only fuel.

Thanks FreeGeo. :thumb
Quote:
 
Look up Speed density vs. Mass airflow...

Good stuff Lescrapp. Going to take awhile to dig through what comes up in the search. :hmm Still looking. :news or do you have a favorite link? :type

Hopefully Tazome will come back soon. Hasn't been around since the original post. :popcorn
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LesCrapp
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snowfish
Dec 6 2016, 08:59 AM
cwatkin
Dec 5 2016, 06:34 PM
I don't fully understand the "straight mapping" but suspect it is a pre-programmed..............

I know there are some turbo mods for these cars and would suspect something similar must be done to accommodate the turbo.
Straight mapping was a poor term. :smackface Without going too far down this bunny trail, :tumbleweed the latest ecu program, and re-flash for 2014 to current 1049cc Yamaha sleds, has eliminated the O2 sensor. BUT still incorporates all of the other sensors including EGT exhaust gas temperature, and AFR air fuel ratio sensors on the factory turbo models. :news Someone way smarter than me figured all this out. :'(
Quote:
 
The O2 sensor does nothing but send a signal to the ecm/pcm. The ecm/pcm does the adjusting of the AFR with stft as long as it is in closed loop. The ecm/pcm can't adjust air only fuel.

Thanks FreeGeo. :thumb
Quote:
 
Look up Speed density vs. Mass airflow...

Good stuff Lescrapp. Going to take awhile to dig through what comes up in the search. :hmm Still looking. :news or do you have a favorite link? :type

Hopefully Tazome will come back soon. Hasn't been around since the original post. :popcorn
LoL! :lol Yep but I learn something every time I do that search... :deal
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