Multiple TB questions
Staging Lane
Joined: Apr 2006
Posts: 50
Likes: 0
From: Chicago, IL
not sure how much this will help you, but there have been more than a couple people who have made their own individual throttle bodies for Hondas.
http://www.tuner-junction.com/TJForu...read.php?t=144
http://www.homemadeturbo.com/tech_projects/itb/
That's 2 really good writeups.
http://www.tuner-junction.com/TJForu...read.php?t=144
http://www.homemadeturbo.com/tech_projects/itb/
That's 2 really good writeups.
TECH Addict
Joined: Aug 2004
Posts: 2,866
Likes: 4
there is a bit of a craze starting over here (and i can see why) for using moptorbike carbs or throtle bodies on 4 cyclinder engines upto about 2.5ltr. the bodies seam to handle the flow no problem and four can diliver over 250bhp i think!
now on a BIG engine you are goiong to start running into the flow limits of the boddies very quickly! if i wehre doing it and wanted to use bike TBs id go for three banks of four (giving 12 TBs in total)! this way you will def not run out of flow through the bodeis anyway!
Thansk Chris.
now on a BIG engine you are goiong to start running into the flow limits of the boddies very quickly! if i wehre doing it and wanted to use bike TBs id go for three banks of four (giving 12 TBs in total)! this way you will def not run out of flow through the bodeis anyway!
Thansk Chris.
Originally Posted by chuntington101
there is a bit of a craze starting over here (and i can see why) for using moptorbike carbs or throtle bodies on 4 cyclinder engines upto about 2.5ltr. the bodies seam to handle the flow no problem and four can diliver over 250bhp i think!
now on a BIG engine you are goiong to start running into the flow limits of the boddies very quickly! if i wehre doing it and wanted to use bike TBs id go for three banks of four (giving 12 TBs in total)! this way you will def not run out of flow through the bodeis anyway!
Thansk Chris.
now on a BIG engine you are goiong to start running into the flow limits of the boddies very quickly! if i wehre doing it and wanted to use bike TBs id go for three banks of four (giving 12 TBs in total)! this way you will def not run out of flow through the bodeis anyway!
Thansk Chris.
Brandon
6600 rpm clutch dump of death Administrator
Joined: Dec 2001
Posts: 4,983
Likes: 13
From: Texas
Ok, a couple of things. My buddies in Australia built ITB intakes before Harrop came out with the production model.
You can buy TB's from Accufab and others.
30MM is far to small. For an 8 runner ITB setup on an ls1 a small TB is 48MM, a medium is 50-52, and a LARGE is 55.
You ditch the MAF and convert to SD.
All the TB's are synchronized, so you only need on TPS input. So, you mount one TPS. Its probably easiest to reference off the linkage, or one TB.
As for an IAC. You can tune to not need one. If you really want one, work from the factory unit. Create a distribution block, and feed it from the ITBs. But I think you can get by without needing one
MAP - A must. You need to have a small hose coming from each TB, and feed a distribution block with your MAP sensor installed.
8TB setup
http://users3.ev1.net/~black_ops/AUS/dsc00025.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00027.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00028.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00037.jpg
4ITB intake.
https://ls1tech.com/forums/generation-iii-external-engine/481985-finished-throttle-body.html
You can buy TB's from Accufab and others.
30MM is far to small. For an 8 runner ITB setup on an ls1 a small TB is 48MM, a medium is 50-52, and a LARGE is 55.
You ditch the MAF and convert to SD.
All the TB's are synchronized, so you only need on TPS input. So, you mount one TPS. Its probably easiest to reference off the linkage, or one TB.
As for an IAC. You can tune to not need one. If you really want one, work from the factory unit. Create a distribution block, and feed it from the ITBs. But I think you can get by without needing one
MAP - A must. You need to have a small hose coming from each TB, and feed a distribution block with your MAP sensor installed.
8TB setup
http://users3.ev1.net/~black_ops/AUS/dsc00025.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00027.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00028.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00037.jpg
4ITB intake.
https://ls1tech.com/forums/generation-iii-external-engine/481985-finished-throttle-body.html
Originally Posted by J-Rod
Ok, a couple of things. My buddies in Australia built ITB intakes before Harrop came out with the production model.
You can buy TB's from Accufab and others.
30MM is far to small. For an 8 runner ITB setup on an ls1 a small TB is 48MM, a medium is 50-52, and a LARGE is 55.
You ditch the MAF and convert to SD.
All the TB's are synchronized, so you only need on TPS input. So, you mount one TPS. Its probably easiest to reference off the linkage, or one TB.
As for an IAC. You can tune to not need one. If you really want one, work from the factory unit. Create a distribution block, and feed it from the ITBs. But I think you can get by without needing one
MAP - A must. You need to have a small hose coming from each TB, and feed a distribution block with your MAP sensor installed.
8TB setup
http://users3.ev1.net/~black_ops/AUS/dsc00025.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00027.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00028.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00037.jpg
4ITB intake.
https://ls1tech.com/forums/showthread.php?t=481985
You can buy TB's from Accufab and others.
30MM is far to small. For an 8 runner ITB setup on an ls1 a small TB is 48MM, a medium is 50-52, and a LARGE is 55.
You ditch the MAF and convert to SD.
All the TB's are synchronized, so you only need on TPS input. So, you mount one TPS. Its probably easiest to reference off the linkage, or one TB.
As for an IAC. You can tune to not need one. If you really want one, work from the factory unit. Create a distribution block, and feed it from the ITBs. But I think you can get by without needing one
MAP - A must. You need to have a small hose coming from each TB, and feed a distribution block with your MAP sensor installed.
8TB setup
http://users3.ev1.net/~black_ops/AUS/dsc00025.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00027.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00028.jpg
http://users3.ev1.net/~black_ops/AUS/dsc00037.jpg
4ITB intake.
https://ls1tech.com/forums/showthread.php?t=481985
Brandon
Originally Posted by xfactor_pitbulls
I realize that you can buy the TBs anywhere, but just wanted to retain the GM IAC. Didnt realize you could do without the IAC.........thats good to know. Obviously the MAF was going to go anyways. I hear you about the MAP that was my most recent thought as well. I appreciate the input guys, this is the kinda thread that really helps people. Gonna start looking for TBs now, the easy one if the circle, I really think an oval would work better for what I thinking.
Brandon
Brandon
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Verdad Gallardo Its alittle more complicated than just running a vaccum feed. I am all about simplicity, especially for the first go round. Obviously I could modify as well after it is done.
Brandon
Brandon
Originally Posted by xfactor_pitbulls
I realize that you can buy the TBs anywhere, but just wanted to retain the GM IAC. Didnt realize you could do without the IAC.........thats good to know. Obviously the MAF was going to go anyways. I hear you about the MAP that was my most recent thought as well. I appreciate the input guys, this is the kinda thread that really helps people. Gonna start looking for TBs now, the easy one if the circle, I really think an oval would work better for what I thinking.
Brandon
Brandon
Also, it really isn't more complicated than running a vacuum feed from each TB, so long as the IAC lets air into the vacuum accumulator.
Idea: The LS1's IAC is incorporated into the TB. Now what if you cut off the rest of the TB, only leaving the IAC part, the inlet, the port, then the outlet. Then just weld, JB weld, or anything a pipe on each end? Stock IAC, stock wiring, etc. A cheap, easy to fab, accurate, reliable IAC valve. I may just do this on some cheapa** TB from like a GM 3.1 or something. Most GMs use the same inline 4 pin IAC connector, and runthe same IAC voltage, so you can use almost any model IAC too.
I am planning on building an itb for the motor im building. I have most of everything figured out except i havent figured out the best way to transition the round throttle body into the cathedral intake port style of the ls1 head the only thing that i could think of is a plate about an 1-1.5 inches thick and blending it. Does anyone have any ideas for this.
Originally Posted by zuluman13
I am planning on building an itb for the motor im building. I have most of everything figured out except i havent figured out the best way to transition the round throttle body into the cathedral intake port style of the ls1 head the only thing that i could think of is a plate about an 1-1.5 inches thick and blending it. Does anyone have any ideas for this.
Launching!
Joined: Mar 2003
Posts: 293
Likes: 0
From: TX.
Originally Posted by xfactor_pitbulls
I plan on fabbing up either an adaptation of an existing intake with a segmented plenum and 4 TBs or building a sheetmetal with 4 from scratch. If I didnt go that route, I already decided to use a single 105mm accufab with a single plane intake. My thoughts are to use 4 30mm tbs in place of the 105, but it that logical? Please dont try and diswade my thoughts on the initial sizing, it works and that is my starting point. Is there anyway to use the stock pcm to control multiple throttle bodies? How about adapting a TPS to work with the smaller ITBs? The electrical system on LSX setups is my weakest subject, so just playing around with ideas. What are the guys doing to run the accufab 105mm ford, I mean from the TPS aspect? Iam sure many of you guys have had the same ideas as I am having.
Brandon
Brandon
You could just use an older style tbi IAC that physically moves the throttle blade to control idle.
hope that helps.
Originally Posted by cueball
You could just use an older style tbi IAC that physically moves the throttle blade to control idle.
hope that helps.
hope that helps.
what TBI is this?
every GM TBI ive seen uses a standard IAC like all of the other cable operated throttlebodys have had..
