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The HM-ITB Write up...
-- added this writeup to tech projects. :)
https://www.homemadeturbo.com/tech_projects/itb/ -random-strike Lots of you have been asking me to do a write up for the homemade individual throttle body setup. Well, I finally took some pics and got the thing installed on my car.. so here we go! https://www.homemadeturbo.com/itb/itb1.jpg Starting off with a set of 2001 Suzuki GSX-R Throttle bodies. I picked up this set on ebay for very cheap! 50 bucks. The spacing looked about right, I think it was about 80mm, perfect for alignment on the B-series head. Measureing at 42mm @ the butterflys and tapers to a 45mm (which also had secondary butterflys that were taken out). https://www.homemadeturbo.com/itb/itb2.jpg The stock manifold was chopped off slightly after the fuel rail mounts, I then had 1 1/2 inch long aluminum runners welded on (1.75od) After the welded I had the manifold surfaced on both sides, and threw a chanfer on the lips of each runner. (75 dollars weld/machine work) https://www.homemadeturbo.com/itb/itb3.jpg Here are the cheap ass velocity stacks I got on ebay, they were 35 bucks. used some small machine screws to fasten them down. Looks kinda cheezy, but they do the job. https://www.homemadeturbo.com/itb/itb4.jpg These are the silicone couplers that attach the Throttle bodies to the intake manifold. Sounds kinda half ass huh? well the factory Suzuki ITB's are this way, and most other bikes too! And after attaching them they were very sturdy. I used Napa bulk Silicone hose, with some hose clamps. (20 bucks from Napa) https://www.homemadeturbo.com/itb/itb5.jpg The Cover shield that hides the linkage and other stuff, just cosmetic. https://www.homemadeturbo.com/itb/welded.jpg The factory ITB Fuel injector bungs were JB welded shut, except for the last one which has my brake booster port coming out. You can also see the map sensor signal lines, each port all T's into one and goes to the map sensor. https://www.homemadeturbo.com/itb/b16itb2.jpg https://www.homemadeturbo.com/itb/b16itb.jpg Thought it looked long? so did I, but after measureing up with the stock manifold, I felt a bit better, I thought for sure the stacks would be touching the firewall, but its actually just a bit shorter than the stock manifold. https://www.homemadeturbo.com/itb/tps1.jpg The TPS situation, well the Suzuki tps had a way differant range than the stock honda one, I tried to make it work, but it just wasnt happening, So the stock honda one had to be modified to fit somehow. First I made a baseplate with a hole saw and some scrap aluminum. This is on the backside of the shaft (driverside) The Brass fitting, was bored out to be a custom bushing for the shaft. https://www.homemadeturbo.com/itb/tps2.jpg The Shaft is actually a honda throttle body shaft cut down about 1/4 https://www.homemadeturbo.com/itb/tps3.jpg Now for mounting, I used a piece of PVC pipe to space out the tps, so it could mount solid. https://www.homemadeturbo.com/itb/tps4.jpg Hoggered out the holes on the base plate a bit, so I could get a good amount of adjustment. https://www.homemadeturbo.com/itb/tps5.jpg Used some extra long machine screws to mount it down https://www.homemadeturbo.com/itb/tps6.jpg All mounted down, Its very secure and pretty easy to adjust. https://www.homemadeturbo.com/itb/volt1.jpg Now setting the TPS up in the correct range. Stock TPS setting @ closed .4 - .5v https://www.homemadeturbo.com/itb/volt2.jpg Stock setting WOT about 4.5v https://www.homemadeturbo.com/itb/volt3.jpg Best I could get the ITB TPS was .6 @ closed https://www.homemadeturbo.com/itb/volt4.jpg and 4.4 @ WOT https://www.homemadeturbo.com/itb/linkage.jpg The throttle linkage was alot easier than I thought! I used an extra throttle bracket from a D16a6 intake manifold, and it fit right off the backside perfect! https://www.homemadeturbo.com/itb/tps7.jpg This kinda pissed me off, I mounted the TPS upside down, it was hitting the master cylinder. So I had to rotate it, and re-adjust it. https://www.homemadeturbo.com/itb/itbinstalled.jpg Overall, for a couple hundred bucks it was well worth it, it took a little bit to get running, the idle was pretty easy, a nice 1100-1200rpms. It sounds pretty interesting too, especially when vtec kicks in. I'll try to post some sound/video clips soon. https://www.homemadeturbo.com/itb/jdm31.jpg The "high flow" JDM 3-1 (yes 3) header, got banged pretty hard the other day. lol, ebay 90 bucks baby! haha https://www.homemadeturbo.com/itb/exhaust.jpg Sporting my old greddy exhaust, (thanks again turbohf) dustin.. You cant even hear the exhaust over the intake, lol. https://www.homemadeturbo.com/itb/redrex.jpg Quick shot of my new front end, new bumper, new hood and new windshield.. Also sporting JDM Civic Single Housing head lamps. JEff |
Re:The HM-ITB Write up...
u make it look so easy. but really how hard was it actully becuase with that write up it doens't seem redicously hard. but still a challenge..
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Re:The HM-ITB Write up...
Woah, very nice... do you feel any performance gains?
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Re:The HM-ITB Write up...
Very nice!
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Re:The HM-ITB Write up...
------- solid, I wish I lived in your hood ;)
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Re:The HM-ITB Write up...
why did you use the connectors and not weld it all up (were the tb's not aluminum?
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Re:The HM-ITB Write up...
WOW thats all i got to say ;D
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Re:The HM-ITB Write up...
Good job Jeff.
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Re:The HM-ITB Write up...
WOW nice man...I told you it might run.
So is there any smoke coming out of the exhaust??? lol reused gasket....and bigger bore from the over honing LMAO....Good job Jeff. Bring in it on with the VID's ;D |
Re:The HM-ITB Write up...
damn! Nice write up. I want hear how that thing sounds like. I bet that thing is mean as hell
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Re:The HM-ITB Write up...
You should put some sleeves ont he screws holding the tps sensor. That might help keep it more sturdy and have something for the tps sensor to rest on... just a thought. Looks great!
Stan |
Re:The HM-ITB Write up...
<---- see the avatar, j/k
that is a sweet setup i want sound and video clips i'll be waiting expectantly |
Re:The HM-ITB Write up...
What did you end up doing about the idle...is cracking them enough control to keep it steady even when cold. It looks like the V-stacks are pretty close to your firewall, do you think itll hurt performence at all.
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Re:The HM-ITB Write up...
Some sound would be awesome Jeff! I want to hear those TB's scream!!!
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Re:The HM-ITB Write up...
you should make a few sets and sell them for like 1500$ a piece, im sure they would sell.
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Re:The HM-ITB Write up...
how did the map sensor issue come out. That is what stopped me after reading about the guy who did this with his dohc zc.
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Re:The HM-ITB Write up...
I would like to have one but I want a turbo cuz I already have it at my house.
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Re:The HM-ITB Write up...
would you be interested in posting
your fuel / ign maps... to give us an idea how to tune itb's you shock and amaze. |
Re:The HM-ITB Write up...
I think the cbr's being a honda use the same map and TPS sensor from what I've read. I was thinking of making a set but didn't know what I was gonna do for an ecu or how to tune it? I've got an extra 1.5 block and maybe throw a z6 head on it but any idea of what to use or should the p28 still work somewhat?
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Re:The HM-ITB Write up...
dont u need stand alone management system?....i mean for ITB?
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Re: The HM-ITB Write up...
I'm not sure what OBD you are using but how would I bypass the EGR and water jacket outlet on my H22 Eg hatch. And also not to forget the IAT. Anyone have any ideas.
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Re: The HM-ITB Write up...
Originally Posted by widebody93
I'm not sure what OBD you are using but how would I bypass the EGR and water jacket outlet on my H22 Eg hatch. And also not to forget the IAT. Anyone have any ideas.
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Re: The HM-ITB Write up...
Hey I might be a noob to the site but not the the swaps. Seriously who know's the how to's with the H22A ITB and how to bypass the electronics. Noob I got your Noob.
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Re: The HM-ITB Write up...
egr you disable through the ecu
iat just stick it on one of the runners if you want or just let it hang iacv you let hang use tees for the coolant lines that you do not use. Remember to keep the water flowing in one direction when you start teeing ----. |
Re: The HM-ITB Write up...
did you have to do any tuning to get this to run properly, or was it just playing with the orientation of the TPS?
I would like to do this to my D16Y8, whats the difference on the port spacing between b series and d series heads? |
Re: The HM-ITB Write up...
where can i get the 1 1/2 inch long aluminum runners
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Re: The HM-ITB Write up...
Originally Posted by SinisterCRX
Stupid noob, dont bring up old posts from almost two years ago.
We do these writeups so people can learn from them. ::) Nobody wants to do a writeup that nobody will read. Its ok to bump legitimate threads if you have a real question |
Re: The HM-ITB Write up...
Originally Posted by powwie
where can i get the 1 1/2 inch long aluminum runners
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Re: The HM-ITB Write up...
Originally Posted by Whitey
We do these writeups so people can learn from them. ::) Nobody wants to do a writeup that nobody will read. Its ok to bump legitimate threads if you have a real question Jeff, did you ever have videos of the car? |
Re:The HM-ITB Write up...
Originally Posted by atomikpunx
would you be interested in posting
your fuel / ign maps... to give us an idea how to tune itb's you shock and amaze. |
Re: The HM-ITB Write up...
its on zdyne and I have the bin but no
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Re: The HM-ITB Write up...
what size am i suppost to get of aluminum runners and how long?
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Re: The HM-ITB Write up...
6 incjes thick 12 inches long
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Re: The HM-ITB Write up...
may be a stupid question but did you sync these up abaz when you were done?
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Re: The HM-ITB Write up...
what size am i suppost to get of aluminum runners and how long? ???
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Re: The HM-ITB Write up...
Originally Posted by nitrogen
may be a stupid question but did you sync these up abaz when you were done?
:6 |
Re: The HM-ITB Write up...
there is linkage between them correct? and vacuum?
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Re: The HM-ITB Write up...
Originally Posted by nitrogen
there is linkage between them correct? and vacuum?
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Re: The HM-ITB Write up...
you should be able to adjust the butterfly's individually, so you get the same vacuum threw each TB. I do this all
the time on sport bikes at work.. |
Re: The HM-ITB Write up...
But anyways to answer your question, no I didnt sync them even if there is an adjustment. I put the unit up to the light and looked at the throttle plates to make sure they looked good, and that was it. It came off a bike with 1200 miles, wasnt to worried, especially since I really didnt ---- with anything.
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