March 2006: Individual Throttle Bodies in the Making - Tuner-Junction

Blake · #1 (**permalink**) March 4th, 2006, 01:34 PM

DIY Of the Month for March 2006

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

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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.

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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.

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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:
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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.
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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.

This is what they should look like once they are done...minus the purple which will be red.
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Clone · #2 (**permalink**) March 4th, 2006, 03:22 PM

sweet. lookin forward to seeing the finished product.

skatin_emcee · #3 (**permalink**) March 5th, 2006, 05:18 AM

^^^^^ definitely. get the damn things back :-D

GsrVtec · #4 (**permalink**) March 5th, 2006, 06:35 AM

nice project. Lookin forward to some videos.

Blake · #5 (**permalink**) March 5th, 2006, 10:44 AM

videos will be here. I'm working on possibly getting a dyno comparison done.

Retroshark · #6 (**permalink**) March 5th, 2006, 12:57 PM

looking great man! cant wait to see them on your car!!!

Ricky · #7 (**permalink**) March 5th, 2006, 01:07 PM

yeah I cant wait to see the finished product this should be pretty gangsta. cromes a good program it has better support n/a then uberdata does

Blake · #8 (**permalink**) March 5th, 2006, 01:08 PM

Quote:

Originally Posted by mrmyz

yeah I cant wait to see the finished product this should be pretty gangsta. cromes a good program it has better support n/a then uberdata does

the user interface is SOO Much better. Its seriously like comparing windows 98 to windows XP.

charliemopps24 · #9 (**permalink**) March 5th, 2006, 01:36 PM

In that pic there are 8 injector holes lol.

Anyway it looks great. Do you have a rough guestimate on how long till completion. Shit's gonna be siiick.

Blake · #10 (**permalink**) March 6th, 2006, 12:26 PM

Quote:

Originally Posted by charliemopps24

In that pic there are 8 injector holes lol.

Anyway it looks great. Do you have a rough guestimate on how long till completion. Shit's gonna be siiick.

yes, there are 8 injector ports. Whichever ports you decide to use, you plug the other 4. If you use the busa injector ports, you can use the OEM honda ports as vacuum sources.

Once i get them back, i have to make a mount for the fuel rail and i have to order the velocity stacks. Once i do that, they will be complete and ready to be installed.

Retroshark · #11 (**permalink**) March 6th, 2006, 12:31 PM

thats pimp. now get to work, i want to see these!

sosojdmaccord94 · #12 (**permalink**) March 7th, 2006, 11:33 AM

No shit! That ITB set up is going to be bad as hell. Good luck with it man.

Blake · #13 (**permalink**) March 13th, 2006, 05:10 PM

aight, little update. I'm having the guy doing all my welding make me a plate to have the iacv bolted to. This is basically like having the skunk2 iacv reloaction kit....but nicer. Running this will aid in tuning.

i talked to Jason at Rage motorsports about custom making me a Vacuum can like the one thats sheepey's car. here's what he said (I=98vtec):

Quote:

Jason@Rage: ok well we have the eg here this week and plan to tune it - i want to make sure this box works and it is big enouph etc. then we can see if we can make some more. the only issue we have is the little mount for the map sensor - we cut sheepys off his manifold and welded it on - ??? so we will be in touch
98vtec: aight, thats cool. Yeah definitely keep in touch with me. I dont have any shops down here that i can trust building me one, and i'd rather have a custom one instead of buying something like a golden Eagle.
98vtec: thanks Jason.
Jason@Rage: no worries - im hoping to dyno asap and then once we know it works and works good, we will contact you with an idea of cost

so....thats the update

ihatericers · #14 (**permalink**) March 13th, 2006, 06:59 PM

badass bro

Clone · #15 (**permalink**) March 13th, 2006, 07:08 PM

if you're making a custom vaccum canister, why not just make the canister so you can mount the IACV onto the side of it? Wouldn't that work just as well?

Blake · #16 (**permalink**) March 13th, 2006, 08:13 PM

Quote:

Originally Posted by Clone

if you're making a custom vaccum canister, why not just make the canister so you can mount the IACV onto the side of it? Wouldn't that work just as well?

dunno, thats not how i am doing things, lol.

The map sensor is getting a mount on the can and i'll have like 4-5 hoses running from it.