I was wondering if it is worth the time and money to do itb’s on a b16a? how much hp would i gain? how much would it cost and what are the bennifitts? thanxx!~ 
the eye candy is priceless lol :rockon: i say go for it
It’ll depend which ones you get.
most of the bolt-on ITB kits were made for the Toyota 4ag motors and were modified so they fit on the Honda head.
This means:
- the throttle bodies are too small
- the angle of the ITBs aren’t optimal for maximum efficiency (airflow should be as straight as possible)
- the length of the throttle bodies aren’t optimal.
PS: Be prepared for lots and lots of tuning
also…depending on the size of the throttle bodies, you might need to get a smaller braker reservoir off of a civic. (otherwise it won’t clear the ITBs)
Ok im not to sure if this will work, but my friend is able to use 2001 gsxr 1000 itb’s on his s13, is it possible for me to do the same on a b16? how much hp should i get? and will it sound more grunty?? Thandd
I really dont see the advantage of going ITB on a stock motor.
yes you’ll gain some hp over stock, but I think there are other parts of the motor that need more attention before converting to an ITB setup.
I feel its modification you do after you’ve done extensive head work at least and possibly bottom end work.
You’ll get more out of an ITB setup with a better head and block setup.
it sounds like you are doing it for more of a cosmetic value rather than for performance. ITBs are usually one of the last mods put on because of the extensive amount of tuning required to get the motor running right.
your car doesnt sound more grunty, but under partial throttle you get a raspy sound from the throttle bodies (kind of like a quiet exhaust sound coming from your engine bay).
Like ExospeedRacing said…I hope you have some sort of engine management system and your motor has alot more than just boltons…
I spent 3.5hrs alone tuning just the ITBs themselves and additional time will be spent on dyno tuning (I’m not ready for dyno tune yet)
this thread is totally not what I expected 
Eclypz, What are you talking about?
1- Too small? There hasn’t even been any mention of sizes…
2- “The angle of the ITBs aren’t optimal for maximum efficiency?” Would you care to explain this statement yet again basing the fact that there is no mention of what kit he is thinking about? Are you basing this off of any first hand knowledge, because if so, please explain what the optimum port entry angle would be.
3- “The length of the throttle bodies aren’t optimal.” Well I assume you are talking about the runner length, and once again, on a kit that hasn’t even been specified. Once again, if you could explain what length you feel is optimal, I’d love to listen. The length from the valve to throttle plate can only be really tuned to a single resonance frequencies and its harmonics. There is no way to really have a “perfect length”. If there is however, I’d like to hear your explination.
And btw, a “braker reservoir” is more commonly referred to as a brake booster.
Anyhow, is there anyone on this site that is actually running a set of ITBs? I am curious about clearance issues with the M/C in a DA.
yea i thought it would be about In The Butt. weak.
ahh well… as long as Rob’s in OT
yes…he never specified a kit, but if you look at my post again, it says it’ll depend which one you get and then i share my findings with him.
Yes, I have ITBs for my car…YES, I did my research, if that’s what your questioning.
Do you have ITBs? Have you done extensive research on them?
I’m giving him advice on what I’ve found while i was in the market for it. I’m saving him alot of headaches that I went through.
Alot of people out there thinking ITBs is just another bolt-on mod that you throw and start seeing gains. I’m telling him from first hand experience that it’s not like buying an intake and throwing it on to see your gains. I spent hours tuning my velocity stacks just so they draw in the same amount of air.
The reason i went through this amount of research about ITBs is because my friend had a B20/VTEC making 220whp, and then he decided to get some ITBs:
He purchased this so called “Bolt on ITB kit” and after 4 hours on the dyno, the best they could do was less than what he started with an IM. This is why i did my research on it before dropping a crap load of money on something that would lose power.
After some research, we found his velocity stacks were too small, too long and at the wrong angle, which caused the loss. His IM and intake setup drew in more air at a higher velocity than his ITBs did.
I’m not here to argue with you and I don’t see why you’re getting so riled up. If you think you can help Canadian rider, then go right ahead.
I don’t even know why i’m going to bother helping you, but i’m going to assume you were just having a bad day.
to answer your question, it would depend on which ITBs you get (diameter and lenghth of the velocity stacks)…it’s definately something you should be thinking about when choosing.
But no, I didn’t have a problem with it hitting my MC.
I did have to switch to a smaller “Brake booster” and then shave a little bit off of a velocity stack so that it cleared.
Well good to see that it is feasable to fit them in a DA. And to answer your question, I have done quite a bit of research on ITBs. Extensive is an objective term.
Unfortunatley for the majority of people who do not carry an engineering degree specializing in fluid dynamics, we have to go with the old fashion trial & error method to fine tune all the variables of an ITB setup. You have obviously attested to that with your personal tuning experience. And ultimately what I’m trying say is that its not as impossible as you claim for one to achieve good results with a well thought out ITB setup.
Lastly, I am curious as to how exactly you tuned your ITBs by means of velocity stacks in order to achieve uniform induction across the 4 cylinders? How were you able to determine the differences in AFR across each cylinder? Visually, it seems that your velocity stacks are all identical.
And BTW, my mistake on the reservoir comment. I thought you were speaking of the brake booster clearance, however seeing in your pic, you were in fact talking about the brake fluid reservoir. :tsk:
like i said, i was just trying to share my findings from my research.
to answer your question, i used an old tool that was used for carbs back in the day.
It was ghetto, but it worked.
hey look in honda tunings february issue. they put homemade itbs using the gsxr throttle bodies on a stock d16y8 and made a 40 hp gain after proper tuning. so you asked if it was worth it? 40 hp is a huge gain.
Hmm intresting! I thought i could use gsxr throttle bodies, but i gues ppl on this thred didnt know what they were talking about,
who said you couldn’t?