fz6 throttle body ?

[SoCal600]

so right now i have a little over 58k miles on the bike and its been running great already have the r6 header and aluminum muffler, K&N air filter (still need a juicebox) but i really been thinking about trying to change out my throttle body. one mod i recently done is i bought a spare fz6r air box off ebay and changed out my intake tubes to all matching short tubes. shorter tubes will live up the top end of the bike (which it did some) the power band pulls a tad stronger now. but with the research i did i found out that the fz6 uses the same fuel injectors, wiring, and fuel rail. i think if i was to pull off the rubber boots on my cylinder head and install the fz6 ones, take out my throttle body intake tubes from my air box and hone out the air box to allow me to fit in the fz6 intake tubes and install the fz6 throttle body, i will have a fz6 throttle body 36mm vs 32mm and everything electrical is plug and play. throw in fz6 cams and take the cam gears to a machine shop to be slotted so i can have varible cam timing and adjust the overlap. what do you guy think ? less than $100 for a fz6 throttle body and prolly $50 for the intake tubes and cylinder head boots.

 

[ST3RL0]

I've thought about doing this but with R6 throttle bodies and injectors

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[Marthy]

I looked into it back when I did the cams. I had it in my hand and even put it on the bike. The thing is the cylinder head port is not any bigger... so no real advantage. Bigger is not always better. The reason to go bigger is to keep peak air velocity under about 70% of the speed of sound. Over that they air get turbulent. So the only reason is the world that you could justify bigger TB is to increase the amount of air that you pump into the engine (engine = air pump) There's 2 way to do that, larger displacement or more RPM.

So unless any of those 2 variable change, no need to go with a larger TB or exhaust primary tube. Doing so anyway will most than likely kill the throttle response at lower RPM for a slight increase at top end... if any. The cams mod with the airbox is a good update (4 short intake tube)

 

[SoCal600]

i hear what your saying marthy, other than the cams, ignition, and throttle body size what seperates us from the fz6 ? we are making roughtly 70 hp vs 95 hp. do you know of the fz6 cylinder head having different valve sizes or port sizes ? in theory if the cylinder heads are the same valve and port sizes, installing fz6 cams and throttle body on our bikes should make us close to fz6 stock hp ? we both use the same fuel pump and injectors. it sounds like alot of work because most people would leave the fz6r alone but i want mine to be unique.

 

[Marthy]

Actually if you leave it stock it will be unique.. lol Been there done that. Witht the exhaust/cams and airbox the bike get a nice bump but nothing to bang your head on the wall. The bike is still 80 lbs overweight with budget suspension. So unless you spend a lot if $$$...

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[SoCal600]

dream crusher lol i know im just chasing the dragon. i did think about pulling out the stock forks and installing 41mm forks from a super sport. a buddy had a yamaha yzf1000 thundercat that had full adjustable 41mm forks. i could swap the forks and brakes straight over. i love how the fz6r feels and having 58k miles its always consistant power. way too many miles on it to sell i wont get much money for it, plus its my first streetbike so it has sentimental value to me. at one point i thought about a complete motorswap lol that would be the best sleeper fz6r ever.

 

[Marthy]

I know what you mean... thats why I kept the old girl

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[Hellgate]

It's all about intake velocity. Too large of throttle bodies kills that.

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[yellowfz]

Actually, sorry Marthy, if you were to take the restriction out of the air box intake tubes look at them they have a small opening that restricts air flow, if you open them up by removing the restriction (cutting the hole to the size of the intake tube) you will get a few extra umps.
A college program did a go cart with a BMW 1000 motor, in order to make the correct power from the engine for the class it needed to be lower horsepower by a few ponies, restriction plate, lowered horsepower, or restricted it to a acceptable limit, not a new thing restrictor plates or restricting to cut horsepower.
Rubber boot that connects the air box to the throttle body, look at it, it is restricted.

 

[SoCal600]

It's all about intake velocity. Too large of throttle bodies kills that.

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I know about intake stacks, longer tubes are better for lower ranger powerband and short tubes are for upper range powerband. smaller tubes are better for torque and bigger (not too much) is better for upper horsepower. the reason all the 4cyl sport bikes (that i know of) have two long and two short intake tubes is for street rideability. i think our bikes fire 1-3-4-2 in every intake stroke its one short and one long, the long 2-3 and short 1-4 is the long tubes created better torque to get going and the upper RPM the shorts take over and keep it going. a HUGE factor is airbox res frequency. the engine intake creates a frequency and you can can fine tune the intake charge by intake tube diamiter and length along with airbox volume which will create a frequency to help add "extra" charge of air when the valve opens. with that being said us going from 32mm to 36mm throttle bodies we should see some gain along with a fz6 camshaft. if our bikes is a 600cc and a r6 or zx6r is a 600cc how are we gonna go too big with a larger (4mm increase) when the supersports are factory installed with 38mm+ throttle bodies. i know cams and valve timing is where your power band is determind but a slight bump in intake size wont hurt our engines performance IMO. i guess one day i will have to prove my theory..... 95% sure im right lol

 

[abyss1406]

why not split the difference in the height of velocity stacks and have them all equal lenghts and have them made out of aluminum so they dont bend or warp at higher rpms

 

[skooter65]

Hey Socal, if you end up going through with this (i.e. people stop crushing your dreams lol), I have a throttle body from an 07' model that I would let go for about half of your original estimate.

Good luck with the chase!

 

[SoCal600]

abyss1406 i dont think our engine pull enough vaccum to deform at high RPM but i did take out my inner tall stacks and replace them with the factory shorts, now they are all even and i did notice a slight bump in power. the difference in our long and shorts is only like 3/4 inch or so. skooter65 i will definatly take you up on that offer soon, i think i can get some extra power out of a simple TB swap and even more with the fz6 cams installed too. hell even if i took my factory cam gears and got them slotted i can do my own custom cam timming and get a few ponies over stock. the camshaft lift, duration and timming is where ur power band is determind. i gotta do another valve adjustment this weekend. i can feel the vibrations and hear the little ticks. i can do a full valve adjustment in about 4 hours from start to finish on this bike. im very tedious when it comes to detail.

 

[SoCal600]

all i need for the TB swap is the rubber boots that bolt to the cylinder head, velocity stackes and the throttle body. i will enlarge the factory airbox velocity holes in the box and install the fz6 ones. everything else is plug and play. i have sportbike performance handbook that i learned about air box frequency and how that helps power, lots of good reading and has definatly inspired my desire to make my fz6r a pure stunner when it comes to homemade production power...

 

[SoCal600]

I've thought about doing this but with R6 throttle bodies and injectors

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yes i also thought about r6 TB but after research i found out the fz6 and fz6r both share a 4 hole 2 way dynamic group style fuel injection system (basicly 1-3 inject fuel then 2-4 inject fuel) and the r6 uses i think 8 hole injectors and they are seqential fuel injected so they fire all individualy. computer wise i think we might have issuesjbut im not sure. 8 hole injectors will give a better spray pattern then 4 hole and a better spray pattern will give u better power and economy so im curious about an injector swap. i dont know our injector cc`s or the r6 injector cc`s. not sure if it is even the same electrical connection..... more research to do

 

[ST3RL0]

After doing a bit of trawling on the interwebs, wouldn't higher cc injector's be needed more so for turbo, instead of na engines?

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[zmp2000]

I would love to do it too.

Marthy did you tested the throttle bodies? Because I read your topic about switching the camshaft, I saw that you had the Throttle Body but you didn`t said that you tried to put that on.

Another question to you guys, Don´t you think the entrance of the airbox is too tight?
I mean, I have the impression that it´s struggling the air entrance, I tought about doing a hole on it, I also thought about doing a ram Air system, but would it work at 200km/h (125 m/h) ?

 

[Marthy]

I would love to do it too.

Marthy did you tested the throttle bodies? Because I read your topic about switching the camshaft, I saw that you had the Throttle Body but you didn`t said that you tried to put that on.

Another question to you guys, Don´t you think the entrance of the airbox is too tight?
I mean, I have the impression that it´s struggling the air entrance, I tought about doing a hole on it, I also thought about doing a ram Air system, but would it work at 200km/h (125 m/h) ?

No need for the FZ6 throttle, thet FZ6R are sufficient to supply the demand. Only reason to go bigger is more RPM (more volume per minute) Look at my airbox mod... 4 short stacks with the airbox cut open is the best that I found. The alum. stack was a snug better but didn't worth all the work and $$$.