GSXR Throttle Bodies (a thread continuation)
 

I made this thread to keep continuity of a good topic. The orginal thread was locked due to size, but the link is here:
https://honda-tech.com/zerothread?id=775280

I'll ask Lip to put this link in his last post on the original thread. https://honda-tech.com/forums/images/smilies/emthup.gif

Re: GSXR Throttle Bodies (Dogginator)
 

The 2000-2003 GSXR 750 throttle bodies measure 50 mm (may be 49.5 mm) at the inlet and 42 mm at the outlet. These are the same dimensions as the GSXR 1000 throttle bodies. I measured my throttle bodies. They are stamped with code 35F0. Check these links for the GSXR 1000:
http://www.mcnews.com.au/NewBi...2.htm
http://www.motorcyclistonline....gsxr/


Modified by Dogginator at 8:26 AM 8/31/2004

Re: GSXR Throttle Bodies (Dogginator)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dogginator &raquo;</TD></TR><TR><TD CLASS="quote">The 2000-2004 GSXR 750 throttle bodies measure 50 mm at the inlet and 42 mm at the outlet. These are the same dimensions as the GSXR 1000 throttle bodies. Check these links for the GSXR 1000:
http://www.mcnews.com.au/NewBi...2.htm
http://www.motorcyclistonline....gsxr/</TD></TR></TABLE>

Copied from old thread:

GSXR750 bodies, internal diameter of 48mm at opening taper down to 40mm and 44mm where the injector leads in.

Above were measured for me from a 1999 model with the desginaion WW, apparently the same as WX.

Re: GSXR Throttle Bodies (edc)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by edc &raquo;</TD></TR><TR><TD CLASS="quote">GSXR750 bodies, internal diameter of 48mm at opening taper down to 40mm and 44mm where the injector leads in.

Above were measured for me from a 1999 model with the desginaion WW, apparently the same as WX.</TD></TR></TABLE>

Indeed. The 96-99 GSXR 750 throttle bodies are smaller. They are stamped with the code 33E5.

Re: GSXR Throttle Bodies (Dogginator)
 

i'm still working on my runners.. got everything else pretty much worked out
here's pic of the epoxy i've gotta port smooth..
http://webpages.charter.net/richardk...yITBflange.jpg

Re: GSXR Throttle Bodies (Dogginator)
 

I havent read all of the other post yet...but i have a few questions. First of all...what would be the benefits of having shorter/longer runners with ITB's? It seems like shorter would give you better throttle response...but im not sure if longer ones would have that much if any benefit. Also, how do you figure out what size ITB's youll need? Thanks

Re: GSXR Throttle Bodies (sCeRaXn)
 

here's one of the runners thats done, i filled in the injector hole as u can see by this pic.

also got a question for you guys who've alread done the diy itbs.. what would work better: having one vaccuum line coming from runner #1 for brake booster? or just have it plugged into the vaccuum log with the rest of the vaccum lines?

http://webpages.charter.net/richardk...portRunner.jpg


Modified by Speedz at 5:28 AM 9/7/2004

Re: GSXR Throttle Bodies (Speedz)
 

finally took the time to finnish these runners inside.. heres pics https://honda-tech.com/forums/images...es/emsmile.gif
http://webpages.charter.net/richardk...itbRunners.jpg
http://webpages.charter.net/richardk...tbRunners1.jpg
next is drilling holes for my vaccuum lines to go to the vaccuum log.

Re: GSXR Throttle Bodies (Speedz)
 

It looks like its coming along. https://honda-tech.com/forums/images/smilies/emthup.gif Did you have any problem with the manifold warping when you welded the tubes?

Re: GSXR Throttle Bodies (Dogginator)
 

thanks man, no my welder was very careful about that.. i'm probably gonna surface the flange tho anyway. (i'm a perfectionist)

Re: GSXR Throttle Bodies (Speedz)
 

another update
http://webpages.charter.net/richardk...cs/gsrITBs.jpg

Re: GSXR Throttle Bodies (Speedz)
 

looking good https://honda-tech.com/forums/images/smilies/emthup.gif

Re: GSXR Throttle Bodies (mEr)
 

thanks https://honda-tech.com/forums/images...es/emsmile.gif
still got more work to do.. gonna try to get the block in my hatch this weekend https://honda-tech.com/forums/images/smilies/emwink.gif still got alot of other things to do before i can start the thing tho.
gotta piece together an engine harness first LOL

Re: GSXR Throttle Bodies (Speedz)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedz &raquo;</TD></TR><TR><TD CLASS="quote">thanks https://honda-tech.com/forums/images...es/emsmile.gif
still got more work to do.. gonna try to get the block in my hatch this weekend https://honda-tech.com/forums/images/smilies/emwink.gif still got alot of other things to do before i can start the thing tho.
gotta piece together an engine harness first LOL
</TD></TR></TABLE>

It looks like it is coming along well. Those velocity stacks are quite nice. Where did you find them? Have you check for brake booster clearance?

Re: GSXR Throttle Bodies (Dogginator)
 

not yet.. but when i had the ITB's in my engine bay, i think it was ok..

here's the guys email address i got them from (was waiting from email from him befor i posted) FASTLISLE@aol.com
he has them made locally.. he gets them in 3 sizes.. 1-7/8....2-1/8 and the 2-1/2 sizes.. and has a large supply of each size..
the 2.1/8" stacks fit perfect on the gsxr 1000 itbs. (at least they do on mine)

Re: GSXR Throttle Bodies (Speedz)
 

where the throttle bodies just laying around or did you purchase them?
and if so how much do a set of GSXR TB's go for?
Are there any charts for throttle body sizes that are appropriate to use with certain set ups?

info would be great
thanks alot https://honda-tech.com/forums/images...es/emsmile.gif
Justin

Re: GSXR Throttle Bodies (MysteryWagon)
 

i bought mine off Ebay for $115 shipped.. they normally go for around 150 or so from what i've been seeing.. i guess it depends on if u get lucky or not as to how much you'll end up paying.

Jenvey's website has alot of good info on ITB sizing.. they also give a good idea on how a system should be designed.
here's a link to their Advice & FAQs http://www.jenvey.com/~Tech_QA.htm
also i suggest reading the VERY long archived thread that's posted at top of this thread. lots of good info there as well.

and here's a small update on fitting my stacks this afternoon.. i think they came out well.
http://webpages.charter.net/richardk.../itbStacks.jpg


Modified by Speedz at 1:08 AM 9/18/2004

Re: GSXR Throttle Bodies (Speedz)
 

Very, very nice work Speedz. https://honda-tech.com/forums/images/smilies/emthup.gif

Re: GSXR Throttle Bodies (EKhatch)
 

thanks man, gonna try to have the hatch running in 2 weeks for our Oct2 race.. u should come on over from ID https://honda-tech.com/forums/images/smilies/emwink.gif

that looks awesome man...keep us updated... https://honda-tech.com/forums/images...es/emsmile.gif

Re: (OLM-02R)
 

Nice VTECH phone in backround!

Re: (GreensleeperB16)
 

what do most people use to tune on a basically stock d16z6.. vafc?

can someone do a rundown of the parts needed?
gsxr work best for d-series?

Re: (dmoto)
 

for d series any gsxr would be good. 600 750 1000.. they'll all work. Hyabusa for B-series. Also.. for K series too. (1 set made) https://honda-tech.com/forums/images/smilies/emwink.gif https://honda-tech.com/forums/images/smilies/emthup.gif

Re: (CRX_VTEC)
 

couple pics showing brake booster space vs my itb stacks
http://webpages.charter.net/richardk...s/fittment.jpg
http://webpages.charter.net/richardk.../fittment1.jpg

Re: (Speedz)
 

lookin great..good work https://honda-tech.com/forums/images/smilies/emthup.gif https://honda-tech.com/forums/images/smilies/emthup.gif

Re: (JUNcr-x)
 

say i get these, and an exhaust.. could i tune it with an safc? or would i need uberdata or something

Re: (dmoto)
 

thanks JUNcr-x https://honda-tech.com/forums/images...es/emsmile.gif i'll keep everyone posted

i cant say what will work as far as tuning.. i'll probably use several rom editors including uberdata..
i'll be finding out the tuning part here soon enuf.

Re: (Speedz)
 

lil pic update:
http://webpages.charter.net/richardk.../gsrITBsPS.jpg

thats beautiful, wish i could make that

Re: GSXR Throttle Bodies (Dogginator)
 

im loving the 3A racing spark plug cover https://honda-tech.com/forums/images...s/emsmilep.gif the ITBs look good. https://honda-tech.com/forums/images/smilies/emthup.gif

Re: GSXR Throttle Bodies (lohatch)
 

LOL it was on the GSR long block i just recently traded for.. i've seriously been thinking about taking it into the machine shop and surface it to get rid of the 3A https://honda-tech.com/forums/images/smilies/emwink.gif

i'm currently working on my fuel rail (custom) i'll post pics when its done.. its gonna have 6-AN end welded on it and a custom plate on the other end for my B&M FPR to mount..
also working on the throttle cable bracket.. and figuring a way to put an adjustable throttle stop so they only open to where they're supposed to.. right now they go way past WOT.

Re: GSXR Throttle Bodies (Speedz)
 

Rick, everything looks like its comming along nicley. https://honda-tech.com/forums/images/smilies/emthup.gif
I can't wait to hear these babys @ WOT. https://honda-tech.com/forums/images/smilies/emwink.gif

-Cesar

Re: GSXR Throttle Bodies (91' LS-VTEC)
 

thanks Cesar https://honda-tech.com/forums/images...es/emsmile.gif

another update with a few pics https://honda-tech.com/forums/images...es/emsmile.gif
work'n on the fuel rail and throttle linkage
http://webpages.charter.net/richardk...srITBsRail.jpg
http://webpages.charter.net/richardk...rITBsRail1.jpg
http://webpages.charter.net/richardk...rITBsRail2.jpg
http://webpages.charter.net/richardk...TBsLinkage.jpg

Re: GSXR Throttle Bodies (Speedz)
 

It's looking good. https://honda-tech.com/forums/images/smilies/emthup.gif What is the total tube length from the trumpet inlet to the manifold flange? Do you think that those trumpets will contact the firewall under hard acceleration?

That looks very nice!! Pretty impressive!!

i have a few questions for the guys that have done this before.
1)will you make more hp then if you had a ported mani and a 70mm tb w/ a cai?
2)whats the average gains doing this?
3)do you have to tune it if you do thid itb's?
4)can i use a aem or any aftermarket fuel rail with a fpr?
5)has anyone tried this in a 90-93 integra? because the motor sits farther back towards the firewall.
6)does it sound alot louder then a cai?
7)has anyone tried it on a non-vtec motor?
8)does anyone have pics of this done on a 90-93 integra with or with obd-0?i whant to see how the sencors,ect. are hooked up.

im going to be useing 02-03 954 throttle bodies becuase i can not find any gsxr 750 or 1000. do anyone think the 954 will work? and does anyone know how big they are?

Re: GSXR Throttle Bodies (Speedz)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speedz &raquo;</TD></TR><TR><TD CLASS="quote">
http://webpages.charter.net/richardk...rITBsRail1.jpg
</TD></TR></TABLE>

WOW!These have to be the cleanest set of DIY ITB's ever. https://honda-tech.com/forums/images/smilies/emthup.gif

is that the stock fuel rail that came with the itbs or did you make that like you said you would. and it is one of the cleanest pieces of itbs ive seen. good job man.

Re: (90 integra)
 

thanks, 90 integra check out ebay.. thats where i got mine.
to answer your questions:

1)will you make more hp then if you had a ported mani and a 70mm tb w/ a cai?
A: from my research, i've learned that ITBs will give you gread midrange power(torque) and good top end... a ported mani and 70mm TB would probably make more peak whp.. but midrange.. ITBs rule (My opinion)

2)whats the average gains doing this?
A: i dont know personally, i saw Jeff from HMT get 152 whp with his diy itbs on a stock b16 which normally puts down about 134 whp (2 different stock b16's i've seen dyno'd)

3)do you have to tune it if you do thid itb's?
A: yes it actually will most likely take more tuning than a single TB

4)can i use a aem or any aftermarket fuel rail with a fpr?
A: depends on your fuel injector spacing.. i had to custom make my fuel rail (bought fuel rail extrusion and drilled holes and welded ends on it)

5)has anyone tried this in a 90-93 integra? because the motor sits farther back towards the firewall.
A: i'd try these on my teg, but that'll be a while.. i've got another GSR head i've gotta finnish porting first then that'll free up this stock one so i can bolt it on my GSR block in the teg right now.

6)does it sound alot louder then a cai?
A: dont know, i'll find out soon enuf https://honda-tech.com/forums/images/smilies/emwink.gif

7)has anyone tried it on a non-vtec motor?
A: i've seen a road race hatch with ITB's on a built LS motor

8)does anyone have pics of this done on a 90-93 integra with or with obd-0?i whant to see how the sencors,ect. are hooked up.
A: i dont have any pics of obd0 teg itbs..
but i can tell you that its simple as far as sensors go.. thats the least of your worries. (my opinion)

heres my completed fuel rail (just had ends welded on today)
http://webpages.charter.net/richardk...s/FuelRail.jpg
http://webpages.charter.net/richardk.../FuelRail1.jpg


this's a link to the fuel rail extrusion
http://www.rossmachineracing.com/extrusion.html

heh and thanks Cesar https://honda-tech.com/forums/images...es/emsmile.gif just wait till they're done https://honda-tech.com/forums/images/smilies/emwink.gif