Tuning the Forza 300 CVT

[Mario]

No need to change the variator on the Forza. All that is really needed to make a big performance gain are some 18 or 16 gm sliders for $30.

+1

[sendler2112]

got a substantial increase in take off torque and speed

So you are talking about your PCX but the gains for the Forza are the same and for the same reasons. What you are feeling is mainly from the lighter mass which make the tran pull at a higher engine rpm during hard accel. But the sliders also have an advantage over round rollers because of their shape which allows a lower, low gear at take off and a higher high gear for top speed and fuel economy. see the video and look closely at what they are trying to show as the difference between the left and the right.
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https://youtu.be/yxcQGmT8EJc
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[robertinino]

No need to change the variator on the Forza. All that is really needed to make a big performance gain are some 18 or 16 gm sliders for $30.

why not 17 grams?

[Mario]

No need to change the variator on the Forza. All that is really needed to make a big performance gain are some 18 or 16 gm sliders for $30.

why not 17 grams?

17g is also an option, I even think 14g will work, it's all about what rpm you want.

[robertinino]

it's a shame didn't know how much gain in performance had to change airfilter with DNA....

[Mario]

it's a shame didn't know how much gain in performance had to change airfilter with DNA....

You have a DNA air filter now ?

[Mario]

Could not sit on my hands anymore

http://www.ebay.nl/itm/HONDA-FORZA-300- ... 0983039314?

[sendler2112]

Now you are going to need a fuel tuner and wideband muxture logger to make it run right again.
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http://www.bazzaz.net/index.php/honda/pcx150-12-15
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[Mario]

Now you are going to need a fuel tuner and wideband muxture logger to make it run right again.
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http://www.bazzaz.net/index.php/honda/pcx150-12-15
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Yes thats the next point, but my dealer advised me a Jet-Kit from EFI

[Mario]

Now you are going to need a fuel tuner and wideband muxture logger to make it run right again.
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http://www.bazzaz.net/index.php/honda/pcx150-12-15
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Btw, what can I espext when I don't use a fuel tuner?

[sendler2112]

Might start running lean. The O2 sensor can make some corrections globally but might run out of room.

[waspmike]

Given that the first thing "enthusiasts' do is change the exhaust one would think the factory knows this so some wiggle room is built in. Also I read somewhere that EFI systems do not use the O2 feedback at full throttle only during part throttle. I also do not think that Honda deliberately strangles the engine by fitting an undersized air filter.

EJK makes an O2 monitor if anyone really wants to know what is going on.

An EJK controller will fix any mixture problems but won't necessarily give you anymore power.

[Mario]

Are there any links to people that uses fuel tuners on there Forza's?

[waspmike]

^ Is your bike running lean?

[Mario]

^ Is your bike running lean?

No, but maybe it will when I have the new Arrow muffler mounted.

[sendler2112]

Those ejk type controllers with 8 zones are very basic compared to a real cell based controller like the Bazzaz or Power Commander which have 100+ cells based on throttle percentage versus rpm.
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The only way to know how the bike is running is to have it measured on a dyno or install a wide band sensor and logger.
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Just try the new exhaust and ride around and let it idle off and on for a few days to let the bike adapt as much as it can. Maybe it will still run fine.

[waspmike]

Those ejk type controllers with 8 zones are very basic compared to a real cell based controller like the Bazzaz or Power Commander which have 100+ cells based on throttle percentage versus rpm.

Its a road going scooter not a MotoGP bike

Something like EJK or TB Juice Box (both made by Dobeck)) is load based, not zone or rpm based. It only has four "modes" but for CVT scooters the "acceleration" - high throttle opening low rpm - mode is disabled as the CVT looks after acceleration unlike a conventional geared bike. So for CVT there is idle, cruise and full throttle.

Academic though as they don't have one for Forza, yet.

Their AFR meter might be useful to some? Saves on dyno time? http://www.afrplus.com/

[sendler2112]

Three or four global zones isn't enough. Many guys report putting them on and taking them off when the bike runs worse.

[Mario]

Those ejk type controllers with 8 zones are very basic compared to a real cell based controller like the Bazzaz or Power Commander which have 100+ cells based on throttle percentage versus rpm.
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The only way to know how the bike is running is to have it measured on a dyno or install a wide band sensor and logger.
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Just try the new exhaust and ride around and let it idle off and on for a few days to let the bike adapt as much as it can. Maybe it will still run fine.

Is there an reset possible on the Forza?
Sow somewhere that the ecu is self lurning the first 500km.

[sendler2112]

It is always re tuning. But only globally and based on a small zone that is mapped at 14.7, which is the only value a narrow band O2 sensor can detect, around idle and low throttle openings. All the rest of the stock map will be set around 13:1 and so can only be measured with an aftermarket wide band sensor. A Honda dealer can show you the actual values for the adaptation with the factory scan tool. You could look at them before and after to see if they eventually change. This only moves the map up and down.
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The full exhaust will improve flow more at higher rpm and throttle openings than at lower ones. So this changes the required mapping to get the best out of it. Just having the map adapt for the change around idle doesn't change as much as what might be required at higher power operation.
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Look at the Bazzaz site to see what I am talking about with correcting the 100+ throttle versus rpm cells.