RCautoworks

Well I put some homemade itb's on my car this past weekend, Saturday and Sunday she was running great, the power was just amazing. But ever since Monday she decided not to run so great, the only thing that has changed was the weather. I'm thinking of just selling them and seeing what I can get for them, even though I hate to let them go because I know they can make loads of power.

Well anyways I thought some of you would like to hear and see them. I'm gonna get some more pics and videos soon.




http://www.we-todd-did-racing....DE%3D

Smokinsax

thats a crazy setup there man...how did you go about making those? WRITE UP!!!!!!!

RIOredKIRKLANDcrx

looks nice, cant wait to see/ hear the video

EL Vap133

Sweet!!! You're a sick man!!

2point2

The map should have corrected it for the weather? hmm..

time to jack.

someone did a pretty good writeup on 'homemade itb's' and made much less hp with them...

https://honda-tech.com/zerothread?id=849943

gave up on them and sold the car i guess? I'm very curious to see some dynos of tuned home made itb kits... anybody?

RCautoworks

Well I have 4 vacuum hoses running to the map so I'm not sure if its enough or not. Like I said before the car was running great before which I don't see how it could just start running really sluggish. I have messed a little with the vafc which helped a little at idle, its not running so rich but it still seems to struggle when you get on it. About the guy that actually lost some power, I think they were just tuned wrong. I contacted someone today to get them tuned but they pretty much turned me away. I was gonna wait for the weather to get a little colder and see if that helps at all, I was told weather does play a huge effect in these. I might keep them on for a little longer and mess with them more just because I know how much there capable off.

Danny you know how crazy I can get , as far as the write up goes, if anyone has anyone questions I'll be more then happy to help, just IM me.

b16_madman

don't sell, figgur them out dood

RCautoworks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B16_madman &raquo;</TD></TR><TR><TD CLASS="quote">don't sell, figgur them out dood</TD></TR></TABLE>

I'm leaning on the edge, right now its sluggish and I just want my car to be as fast as it was. I looked over the setup a few times and still can't see anything wrong with it, I know one of the rubber hoses does suck in a little at idle but when you give it gas it fixes it self out, so I know that is not causing the problem. I might get a vacuum block and see if that will help out.

2point2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90blackcrx &raquo;</TD></TR><TR><TD CLASS="quote">its not running so rich</TD></TR></TABLE>

that seems to be the common denominator with itbs... someone shed some light on this. you would think it would be the other way around!

Full Race A6

Why exactly would ITB's increase power? curious

Also how much did it cost you what t/b did you use

LudeEFv2.4

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by W O T &raquo;</TD></TR><TR><TD CLASS="quote">Why exactly would ITB's increase power? curious

</TD></TR></TABLE>
say for instance you have a 68mm TB, take four 22mm TB's and now you have an 88 with less resistance and better velosity. since the TB's are closer to the head you also increase throttle response.

DarkSideofOZ

I'm new to this... what does itb stand for and what does it do... I already searched

I have a b18b1.. all LS going in my civic this month... do ITB's apply to my engine.. (noticing you have a vtec)


Modified by DarkSideofOZ at 4:21 AM 6/9/2004

Full Race A6

Individual Throttle Bodies

LudeEFv2.4

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by W O T &raquo;</TD></TR><TR><TD CLASS="quote">Individual Throttle Bodies</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DarkSideofOZ &raquo;</TD></TR><TR><TD CLASS="quote">I'm new to this... what does itb stand for and what does it do... I already searched

I have a b18b1.. all LS going in my civic this month... do ITB's apply to my engine.. (noticing you have a vtec)

</TD></TR></TABLE>

any all motor aplication cam benifit from this.

AgentJam

for those who know more about ITB's...what do you use as a filter? I've seen dozens of pics of these of mostly B16/18's but never seen any sort of air filtration.

I'm sure it's there or that would be pretty risky...

Vince

RCautoworks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point2 &raquo;</TD></TR><TR><TD CLASS="quote">

that seems to be the common denominator with itbs... someone shed some light on this. you would think it would be the other way around! </TD></TR></TABLE>

I'm thinking its because the map sensor is not seeing enough vacuum, when you are wot your barely pulling any vacuum so the map sensor sees this an increases fuel. I have not studied the map sensor in depth so I could be wrong on this. I would like to hook a vacuum canister and see if that helps, anyone care to donate me one or give me a good price on one ? I am also talking to Dave ( aka suprdave ) and he says he will hook his wideband up and drive the car and make some adjust for $100, this is a great deal but I just hate to spend more and more into this project especially if the car is still gonna act the same.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by W O T &raquo;</TD></TR><TR><TD CLASS="quote">Why exactly would ITB's increase power? curious

Also how much did it cost you what t/b did you use</TD></TR></TABLE>

I used the cbr 954 setup, ITB's will increase air flow therefore increasing fuel, well the more air and fuel you have the more hp you get basically, well if its running correctly to.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AgentJam &raquo;</TD></TR><TR><TD CLASS="quote">for those who know more about ITB's...what do you use as a filter? I've seen dozens of pics of these of mostly B16/18's but never seen any sort of air filtration.

I'm sure it's there or that would be pretty risky...

Vince</TD></TR></TABLE>

As of now I am running nothing, I don't see any big things like rocks flying up in there, just because where there postioned. As far as the other little things, I'm not to concerned maybe in the long run if I end up keeping them I will get a filration system hooked up. Oh yeah, gas mileage is horrible.

Blaze45

From what I have read and learned about ITBs they are hard to tune and getting running right but make good power once that is accomplished. Keep messing with them and see how things turn out.

Good luck with it all

Blaze

RCautoworks

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Blaze45 &raquo;</TD></TR><TR><TD CLASS="quote">From what I have read and learned about ITBs they are hard to tune and getting running right but make good power once that is accomplished. Keep messing with them and see how things turn out.

Good luck with it all

Blaze</TD></TR></TABLE>

Yeah, I'm gonna mess with them more. Right now when you step on the gas it almost seems like I'm running on 3 cylinders, but once it passes a point it seems like it kicks in a little. Like I know when you shift from 1st to 2nd it seems like it puts you back in your seat more. I'm gonna do little inspections again and see if I come across anything, I should have some more videos tomorrow of her running with the hood open.

Mr.Saturn

OER ITBs from Japan are plug and play with no standalone needed. I believe they come with a box that plugs in to modify the fuel maps but more to the point, they come with this:


Ignore the writing, but attached to the vacuum box are the IACV, FITV, hoses, and more importantly, some type of filter or one-way valve. I don't know if this will help anyone or not but I haven't seen a custom vacuum box on HT yet with a filter or valve.

Another comment that I might add, is shouldn't the MAP sensor values need to be rescaled in the computer? I'm thinking that with longer runners, a plentum, and a throttle further away, less air is being sucked in in a stock application (through one ~65mm hole). But in ITB applications, with four 42mm throttles very close to the head, and also near the vacuum ports, the MAP sensor should see atmospheric at a much lower throttle angle. And also the overall maximum vacuum should be less with four 42mm throttles.

I haven't done any experimenting yet, currently being jerked around by the 3rd eBay seller so far for getting some GSXR ITBs. These are just two ideas I've had since I've read most people having similar problems with ITBs. The MAP sensor rescaling is just how I picture everything working in my mind, it could work totally differently but I suppose its worth a shot... its what I'm gonna do whenever I get up and running.

joesefcivic

thats the vacum log. if you dont have that you have not breaks. your breaks work off of vacum off the intake manifold and if you ITB's then you have no vacum so they make that to supliment for the manifold.

crx_88_si

https://honda-tech.com/zerothread?id=752484

check it out.

4drEF

Why is the rpm hunting at idle?


I don't know, but all I seem to hear is your exhaust?
Pop the hood rev it up so I can hear some suckage!

2point2

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by joesefcivic &raquo;</TD></TR><TR><TD CLASS="quote">thats the vacum log. if you dont have that you have not breaks. your breaks work off of vacum off the intake manifold and if you ITB's then you have no vacum so they make that to supliment for the manifold. </TD></TR></TABLE>

correct me if i'm wrong - you'll still have breaks.. they just wont be vacuum assisted - not a good idea.

2point2

What about using a map sensor from a honda bike? anyone try that? or log some values off of the map sensor (vacuum and voltage) and compare with a stock manifold?

UNDER PRESSURE

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2point2 &raquo;</TD></TR><TR><TD CLASS="quote">What about using a map sensor from a honda bike? anyone try that? or log some values off of the map sensor (vacuum and voltage) and compare with a stock manifold?</TD></TR></TABLE>

Good idea. If I ever try to do ITB I'll try this.