Itb Build

[Godspeedtuning]

Im starting to research into making my own ITB set-up for my D16Y8. I was wonderind what kind of ITB's (ex. CBR, SUZUKI, ect.) are the easiest to adapt linkage and fuel wise on d-series engines?

-KC

[jimmyb34]

any honda ones are the easiest

[custom_junky]

cbr 900 would be good itb's

[modsHXcivi]

This may help ....

http://www.d-series.org/forums/showthread.php?t=2957

[egriffith45]

i'm having a set made for me from a cbr 929

[K2e2vin]

any CBRs, are probably the best. 954s have the same diameter as the GSXR1000 I believe, but the fuel rail, spacing, and TPS readily work. The throttle linkage requires minor modification IIRC.

The GSXR will require spacers, extended throttle tabs, use of stock fuel injector location or modified fuel rail, and TPS modification(or you can run Crome ITB Tools and adjust the voltage to work with the GSXR TPS).

[Godspeedtuning]

Thanks for the quick responses guys.

Now Im wondering about the power gains going to ITB's on our d-series motors? Mostly anyone puts these on a relatively stock motor?

Im planning on setting them up on a stock d16y8 at first to work out the bugs and to tune, but soon plan, when the snow melts, to add p&p head w/ Crower stg. 3 cam.

-KC

[K2e2vin]

A guy with Honda Tuning magazine got like 130whp with tuning using GSXR1000 throttle bodies on a pretty much stock D16Z6. Pretty good IMO.

[Eyal 951]

I wouldn't do it and leave compression and cam and headwork alone.

I will be using toyota 4ag 42mm's for the ITB's that are being made for me right now. No silicone couplerrs cheap setup, I'd like to do things well. (I'm also adding a more aggressive cam, more compression over my current 11.2:1, headwork and valves) Y8 head btw.

[Godspeedtuning]

A guy with Honda Tuning magazine got like 130whp with tuning using GSXR1000 throttle bodies on a pretty much stock D16Z6. Pretty good IMO.

Ive been searching their site and cant find it. Do you happen to have more info on it?...

[K2e2vin]

When were sport bikes cheap? Considering they're 600cc-1L and still outputting more power than us...They have the ITB's clamped on. I can understand making it cleaner, but calling it cheap...bah; that's an insult.

[K2e2vin]

Ive been searching their site and cant find it. Do you happen to have more info on it?...

Sorry I don't. There was a scan of the article in the archives, but it's gone now. That set of ITB was for sale on here I believe.

[Godspeedtuning]

Do you remember what kind of car it was so I can narrow my search?

[K2e2vin]

it was a 96-00 Civic. Dru Barrios I think was his name, the car was his girlfriend's.

[sl@sh]

and i think the ITB set made by Dru barrios is for sale on the selling forum...

myt help checking out pics of it hehe

[Eyal 951]

When were sport bikes cheap? Considering they're 600cc-1L and still outputting more power than us...They have the ITB's clamped on. I can understand making it cleaner, but calling it cheap...bah; that's an insult.

well, its not the great for flow... If your going for ITB's, might as well maximize flow, increase sturdiness, and reduce possibility for failure, or wear.

Any serious setup isn't typically a clamp together setup. Yea, it'll work, but it's not maximized.

I'm sorry you are offended.

[kyle h.]

I'm in the process of building a set of ITBs out of a 954 set. I am cheap, but I severly doubt there will be perfomance gains over not using couplers.

You can buy the best parts, but if you don't have the best tune, you're not going to be making power. And from my experience people tend to sacrafice one for the other.

[sl@sh]

i think he meant by not running couplers, it wud prolly look cleaner, and having flanges bolted to each other makes it sturdy,

Toda, Asports and OER in japan uses the toyota 4ag 4throttle units , they just make their own adapter/flange for it FYI

[sl@sh]

here is a pic of what he was talkin about,

no couplers, but flange's making it a bolt on affair,

ofcourse, the runners, and all of the other components need to be sized correctly,


http://img.photobucket.com/albums/v305/sohc/DSC03189.jpg

i think i got this image from vwvortex or sumthing.. i cant remember, its bin a while, its a toyota 4ag 4 throttle assembly, with adapters to fit a vww inline4 head

[Eyal 951]

I'm in the process of building a set of ITBs out of a 954 set. I am cheap, but I severly doubt there will be perfomance gains over not using couplers.

You can buy the best parts, but if you don't have the best tune, you're not going to be making power. And from my experience people tend to sacrafice one for the other.
yes of course tune is most important. Church did my car before, and they'll do it again. I have to ditch my hondata p28 for a p28 with crome pro though.

[modsHXcivi]

and i think the ITB set made by Dru barrios is for sale on the selling forum...

myt help checking out pics of it hehe

N00bs..... can't view the For Sale Forum with out 65 posts

[Dibble]

Is the CBR1100RR black hawk carbs? Cause if not, I would think those would be the biggest.

[sl@sh]

N00bs..... can't view the For Sale Forum with out 65 posts
oh hahaha

sorry i forgot about that....

[K2e2vin]

Is the CBR1100RR black hawk carbs? Cause if not, I would think those would be the biggest.

those are about the same size as the 954s and the GSXR1000s. Busa ones are probably the biggest with 46mm bores.

[Brian1337]

:TU: I've got some CBR 600 RRs for sale and if you buy the Y8 intake manifold with them I would knock off 10 dollars. Then you don't need to worry about down time with your car.:TU:

I was going to go ITB, it's a great way to get some power if you get them tuned plus they sound mean as hell.

[Eyal 951]

Is the CBR1100RR black hawk carbs? Cause if not, I would think those would be the biggest.

biggest is not best. Not for these motors at least.

[K2e2vin]

Just for kicks:
http://i27.photobucket.com/albums/c164/K2e2vin/104313992_333599379_0.jpg
TL1000R inlet vs. GSXR1000 inlet

[sl@sh]

damn! that gsxr inlet can go inside the other throttle haha

[ferioKYOSO]

itb d series:mikej:

workin on some myself.

[SOHCinWA]

Bolted a set of 98-01 Yamaha R-1 Carbs on my D. Spaing was perfect. Dont know why people are complaining about using couplers. Even though mine are just carbs, they are already tuned to rev way higher than my motor will ever go. And I can still use the TPS on the carbs if I choose to

[SOHC_STUDENT]

Thanks for the quick responses guys.

Now Im wondering about the power gains going to ITB's on our d-series motors? Mostly anyone puts these on a relatively stock motor?

Im planning on setting them up on a stock d16y8 at first to work out the bugs and to tune, but soon plan, when the snow melts, to add p&p head w/ Crower stg. 3 cam.

-KC

They're really not for a stock motor or daily driving.

The benefit of ITBs are the few psi of free pressure you get from the column of air jamming itself into the combustion chamber. You lose that benefit when you filter the air.

Tuning is the key to ITBs. Like Eyal said, bigger isn't necessarily better. The trick is getting all the parts of the engine in tune with each other. The length and diameter of the velocity stack has to be tuned to fit the cam profile and head flow characteristics. You'll need a wideband and ecu capable of data logging and re-writable ignition and fuel maps. The actual tuning is done based on throttle position or you can run a vacuum log and map sensor to verify throttle position through manifold pressure.

[SOHCinWA]

I dont know about any of you. But for all out power I would have to say carbs. Only thing I dont like about them, it takes FOREVER to warm up in the morning. But man does it pull

[remoer]

ok just to help ya strokers along. i will say this how many of ya who are going to do very extensive head work?(springs and retainers) the only reason i'm saying this is, several reason. if and you do decide to do this, i want to explain to you that a stock head is good up to 8k then you will float a valve if you keep pushing it. i'm in the process in doing a full built head for itbs, which can go up the in numbers but is it feasable for DD? no. the bigger the itb is the higher the peak Hp goes. in sense cbr600rr are 40mm and you see some good mid's and hi rpm without pushing the readline mark. the bigger the itb 40-42mm the higher your peak goes the higher your redline goes up and so forth. so in truth the question here is how much power and money your willing to spend. my head work will cost $2,500. (port and polish, springs, retainer) why would i spend on just that much money on a N/A? well in N/A you make the most HP in the head and in Turbo you need to have the bottom end build to with stand the HP. it's a give or take. there my .02.

[Eyal 951]

I already have crower spring and retainers. I will have alaniz do my headwork, and use aftermarket valves. I will also upgrade my stage 2 crower to a stage 3. My compression is currently 11.2:1. Mill, and flat valves should snug it up right into the 12:1 area.
We are shotting to hit 3rd harmonic around 8000. To hit 2nd harmonic at 8200, the V stack sits half an inch or so away from the firewall. Not only will it probably hit, but its probably not enough space to allow a clean and maximixed flow, not to mention a filter. Theres still some planning etc to do, so thats not final at all.

[grand champ]

any CBRs, are probably the best. 954s have the same diameter as the GSXR1000 I believe, but the fuel rail, spacing, and TPS readily work. The throttle linkage requires minor modification IIRC.

The GSXR will require spacers, extended throttle tabs, use of stock fuel injector location or modified fuel rail, and TPS modification(or you can run Crome ITB Tools and adjust the voltage to work with the GSXR TPS).



So if i use itbs from 954 then the tps will work and i can use my stock injectors??

Sounds to good to be true!!

[225slant6]

can you make a blow through turbo itb setup or any way to set up itbs on a turbo setup?

-mike

[SOHCinWA]

I thought about that a couple times myself. I know the old bugs have them blow through the carbs. I guess if you had some sort of single inlet airbox you could do it.

[Eyal 951]

can you make a blow through turbo itb setup or any way to set up itbs on a turbo setup?

-mike

yea, not to difficult. Just seal the Velocity stacks inside an airbox that can handle boost.

Here is a setup sold for the Porsche 944 turbo. (super spendy, and a lot more complex then you would need for a honda setup)
http://www.jmengines.com/images/951engine_2.jpg

http://www.jmengines.com/throttle.htm

[225slant6]

is there anyway to have it turbo without the air box maybe after the carbs? i love the look of itbs would be the reason switching to them so an air box covering them is just wrong.

-mike

[sl@sh]

well then turboing itb's is just wrong for u?

ud need a common plenum to seal the 4throttles for boost,

[Eyal 951]

you can use plexi to make a clear plenum so you can see the velocity stack inside.

[HondaPACT]

I had ITB's on my Z6 with 929 throttle bodies...still have them...loud as shit, never tuned them cause I switched to a turbo setup before I got the chance...ITBs and boost are kind of pointless to me, where u can just build a IM with velocity stacks at the end of each runner and then enclose them and bam same shit minus the throttle blades...

[HondaPACT]

oh yeah ITB tools on Crome X2, IMO the only way to tune it properly...a log helps but end result u will lose vacuum at a very low throttle postion aka its gonna run like shit...unless tuned

[ferioKYOSO]

I had ITB's on my Z6 with 929 throttle bodies...still have them......

lmk if u ever want to get rid of em:TU:

[ferioKYOSO]

Ive been searching their site and cant find it. Do you happen to have more info on it?...

may be too late but they are in the feb 2005 issue. With tuning they put down 144 hp to the wheels with stock internals:mikej:

[remoer]

lmk if u ever want to get rid of em:TU:

if i'm correct, he used the word "had" which is in the english grammer mean "the past tense of have".
i could be wrong but i think this is a good moment to used:
i think the noob just got.....:0wnage:

[Eyal 951]

if i'm correct, he used the word "had" which is in the english grammer mean "the past tense of have".
i could be wrong but i think this is a good moment to used:
i think the noob just got.....:0wnage:

Nope, you owned yourself. Observe:

I had ITB's on my Z6 with 929 throttle bodies...still have them...loud as shit, never tuned them cause I switched to a turbo setup before I got the chance...ITBs and boost are kind of pointless to me, where u can just build a IM with velocity stacks at the end of each runner and then enclose them and bam same shit minus the throttle blades...

I think you at least owe me some :TU: rep son.