[98vtec]

since i will no longer be updating my thread on SHO, i will bring it here.

So here it goes from the beginning.

I had researched about this topic for a good 2 months before i decided that i definitely wanted to do it.
From there I purchased a set of 1300cc Suzuki Hayabusa ITB's from Golden_child on hayabusa.org for 175 shipped. They measure 46mm. I had an extra intake manifold from my motor swap and took that to a machine shop and had it cut.




So after doing a little more research i realized that i was going to need to have the throttles spaced in order to fit on the straight runner design. Lucky for me the Suzuki throttles are able to be taken apart.


I couldnt find anyone locally that i trusted to do the welding work and i dont personally have access to a welding machine so i knew i was going to have to find someone to do the welding for me. Little did i know, there was a little more welding involved than i thought.

I sent the flange and throttles off to a guy I met on honda-tech who has had experience in building these.

I dont have any pictures right now but i can tell you exactly what we are doing with them:

1st, the runners need to be welded onto the flange. Being extra careful not to mess up the stock injector ports so i wouldnt have any problems with the injectors sealing properly.

2nd, after the runners have been welded on...you have to determine how big of a spacer you are going to need to put between each throttle in order to line each one evenly to their parter runner. You will not be able to use the stock nuts and bolts that originally held the throttle together. You will need longer bolts due to the throttles being farther apart...duh!

3rd, since you are spacing the throttles apart..how do you put the throttle linkage together. In the picture below you will see the throttle linkage without any spacing done. This is the stock location:

so....how do you put them together once they are spaced? Simple, however amount of space is between the linkage, you weld a tab that connects them together.

The velocity stacks i have chosen to use are just absolutely SEXY. well, i think they are atleast.


These stacks run at $199 for the set. What i really like about them is that they are specifically engineered for hayabusa throttles. This immediately caught my eye.

Now....what about the TPS sensor? How am i going to fix that? What program am i going to be tuning with?

Well, fortunately for me I run a program called Crome which has full support for ITB tuning. It has a voltage scaler that allows you to run non factory TPS sensors and still be able to drive them as if it were a stock TPS. This is what you do:
1). Splice the harness from the suzuki TPS into the Honda TPS harness.
2).Get voltage readings from 0% and 100% throttle.
3).Write those numbers down and enter them in their respective place when you install the ITB tools plugin in Crome.

This voltage range of the suzuki tps is much less than that of the honda tps, which is the reason for this tool.

I will update with pictures and more details once i get them back. There are a couple other minor details that i will explain later.

[steveobb4]

coo

[97 Lude VTec]

man, am i excited to hear/see those things in action... get this **** done... and good luck

[converge]

i'm excited about this. i'm very impressed.

[98vtec]

Originally Posted by 97 Lude VTec

man, am i excited to hear/see those things in action... get this **** done... and good luck

the last things to do once i get them back are to actually order the stacks and weld mounts onto the runners so i can mount the fuel rail. After that, the installation and tuning begins

[BDoggPrelude]

Any estimations on when you will be finished? Also, is this setup street legal?

[93PreludeSi]

i dont know why i thought u lived in NY but i though you did. Great write up and what year hyabusa were the ITBs off of. Do you know if hondata has that ITB program like crome? o yea and ur def gettin rep points for this.

[98vtec]

Originally Posted by BdoggPrelude

Any estimations on when you will be finished? Also, is this setup street legal?

it may not be legal in some states and i can almost gurantee that you wont pass emissions testing with them.

[TopEndLude]

glad to see everything going a long so smoothly.

[BDoggPrelude]

Originally Posted by 2.2L

it may not be legal in some states and i can almost gurantee that you wont pass emissions testing with them.

That's awesome.

[98vtec]

Originally Posted by 93PreludeSi

i dont know why i thought u lived in NY but i though you did. Great write up and what year hyabusa were the ITBs off of. Do you know if hondata has that ITB program like crome? o yea and ur def gettin rep points for this.

hahaha. I really dont know what year they are from. I'd like to say 2003. The only version of hondata that has itb support is the s300 unit.

[98vtec]

Originally Posted by BdoggPrelude

That's awesome.

i dont have emission testing so its nothing to worry about

[BDoggPrelude]

Also, wouldn't you pretty much have to keep street driving minimal since you won't have any kind air intake filter anymore? Sorry for all the questions. This is really intersting.

[98vtec]

Originally Posted by BdoggPrelude

Also, wouldn't you pretty much have to keep street driving minimal since you won't have any kind air intake filter anymore? Sorry for all the questions. This is really intersting.

i will have filtration. There are many bike shops that sell socks that you can put over the velocity stacks and keep dirt and other road crap out of the motor. That way, if i ever wanna pop my hood, i can just pull the socks off and make them "look" better, lol.

[fastkill]

Originally Posted by 2.2L

i will have filtration. There are many bike shops that sell socks that you can put over the velocity stacks and keep dirt and other road crap out of the motor. That way, if i ever wanna pop my hood, i can just pull the socks off and make them "look" better, lol.

oh really thats pretty cool I always wondered how that worked.

[93PreludeSi]

ill have to find out which one my brother has. I want to do this and i can do the welding myself its just the cutting part that i dont trust myself on and ill have to have a back up intake mani incase i mess it up. well it doesnt really matter i dont have an engine in my car i shouldnt be worried about this but ive been planning to do this for a while. when they are done you BETTER make a WOT pass video with no socks or anything i wanna hear that thing scream. if you dont ill come down to your fuckin emission less florida and make you do it at gun point

[fastkill]

by the way I always wanted to take a look at itb's on forced induction. I don't see that set up around too much. u have any pics

[98vtec]

there are lots of people who are crazy enough not to run socks or filters. But these are the same people that
A) hardly drive the car
B) It's a drag/Street car and it gets broken down for maintenance every "x" amount of miles or pulls.
or
C) too stupid to know any better

[93PreludeSi]

thats a redtarded amount of work and kind of pointless to have ITBs with FI

[93PreludeSi]

well your gonna do a pass for me with no socks right??

[fastkill]

Originally Posted by 93PreludeSi

thats a redtarded amount of work and kind of pointless to have ITBs with FI

I seen a couple of pics on it @ a diff forum but never see to much discussion on it. But i guess it can be done.

[98vtec]

Originally Posted by 93PreludeSi

well your gonna do a pass for me with no socks right??

sure thing.

[donalduck_69]

Originally Posted by 2.2L

That way, if i ever wanna pop my hood, i can just pull the socks off and make them "look" better, lol.

You know, 2.2, for some reason, I don't think you'll have to make them "look" better. But, I have been wrong before. Oh, and I can't believe you let SHO see all the goods before us. Poo on you for that. But, now that you're here more, I guess I'll forgive you. Oh, and you rock. Just in case you weren't sure. Okey doke.
Nate

[98vtec]

Originally Posted by 93PreludeSi

thats a redtarded amount of work and kind of pointless to have ITBs with FI

i've seen it done before but personally i would spend the money upgrading the turbo manifold. going from a log manifold to an equal length manifold is an instant 40whp.

[93PreludeSi]

anything can be done with time and money. it just matters if its worth it. having ITBs and boost dont really work together giving each cylinder its own throttle body gives it the opportunity to suck as much air as it wants because a manifold has 1, lets say 68mm TB, for all the cylinders to get air through. each TB on a ITB can be almost 50mm by itself. with boost air is being PUSHED into the engine so it doesnt matter how much air the engine is sucking because it has no choice but to take it in from all the pressure outside of the motor hence the name FORCED induction. really what im saying is ITBs let the cylinders breathe freely and boosting is like rape you dont have a choice its going in no matter what so you dont need to give each cylinder its own TB if it would be breathing on its own its being given plenty of air by force. thats my info of the day if anyone knows im wrong go ahead and correct me but thats my view on y boosting ITBs is pointless.