I was sitting around at work and was thinking to myself if Individual Throttle Bodies (ITB's) would work on our cars if a company is interested in doing research and making some.

If a company can manufacture some for our cars, would tuning be an issue as it would be with force induction? Is it worth it?

Just a thought for some of us that might want to stay naturally aspirated.

PS - I searched and couldn't come up with anything

 

This is mainly for better throttle response since the closer the butterfly is to the intake valve, the better response will be. It made more sense on older carbureted setups to get rid of the deficiencies of the wet flow manifold setup and distribution problems.

There's no real advantage on a street car, probably wouldn't produce any extra power, would throw the tuning of the intake manifold out the window, would be extremely expensive and I doubt anyone makes individual DBW throttlebodies.

 

i think they have them for the nsx and im pretty sure all you would have to do is fab up something like the nsx

 

integra,rsx,civic, etc guys are doing this all the time on street cars. the part you wrote about gains is not true at all. some of these guys are seeing more then 20whp just by bolting them to a stock motor. also alot them run on stock ECUs

 

the NSX requires conversion to the cable system from DBW, but the issue is that if we do cable, we loose part of our VSA system since DBW also is controled by it in the event of a skid to help power/engine brake. I might add that if you do ITB's you have no way to tune the TL. As well by getting ITB's, you be putting hot air into the motor, which is stupid and pointless. Best bet, find a shop to port and polish the intake manifold, polish and port the intake runners, do a 3-5 angle valve job and maybe blueprint and balance the motor.

 

Different configuration. They're inline 4s, no DBW, more tunability with the factory ECM, and they're higher strung motors which are more favorable to this setup. How much torque do you think the TL would lose? You got a link to this 20whp gain?

Just like was said, you're better off porting and polishing or extrude honing the stock manifold. Absolutely no need for this on a TL.

 

good luck tuning

 

pm racinghart03 he upgraded his TB.

 

google and search... its beautiful man

 

I'm not saying it's impossible. It's very possible but it's a ton of work and a lot of headaches for very little if any gain on a TL. Why go through all that trouble and headache for a custom one off thing that would be out of most people's price range when you can get a bigger throttlebody and extrude honed intake manifold for the same or better gains and 1/4 the cost without tuning issues?

Also, it would be a bit hard to have a functioning EGR system with this setup. So besides emissions (doesn't matter since the ITBs are illegal anyway) you would run into pinging problems at part throttle without an aftermarket ECM to back off timing where the EGR used to run.

 

After reading some of the Honda forums, it's pretty much what I said in my first post. People do this for better throttle response which I already said and for when they're building an all motor monster and looking for that little bit extra. Most agreed it would do very little if any on a stock or near stock motor. It's also mentioned gains depend on how well you can tune which we can't do with the TLs.

www.hondacarforum.com/honda-technical/40540-what-do-individual-throttle-bodies-do.html

 

too bad this car isn't mass produced...

 

http://www.honda-tech.com/showthread.php?t=2411073

 

^ he's using gixxer itbs

 

That's pretty cool that the guy fabbed his own setup.

But, he doesn't have smog or drivability to worry about. Plus, 170lbs of torque out of a V6, revving to 10K to make 255hp kind of reinforces my theory on these things.

You do realize you could swap a stock TL-S motor in there and run the same times or better...

 

do you realize that mazda v6 is smaller than 2.5l and in stock trim put out less than 199fwhp and less then 165lbs oh i dont live in a smog control area

 

You're lucky. Here in CA I have to pay a pretty large sum of money to get my other car "smogged".

I'm not trying to take anything away from the guy. His car makes a lot of power for it's size NA. This is the kind of car the ITBs are good for, higher hp, revs to the moon, low torque engine. I just don't think it would be worth it on a TL especially with all the problems you would have to overcome to make them work.

 

do i have to find the link for the stroked 4.1l g35 with itbs for you. that car did 355whp

 

did it anyway. even have a itb before and after dyno http://my350z.com/forum/shop-builds/...oker-itbs.html

 

355hp is completely doable without the ITBs. The gains were against a stock manifold with spacer. Put a larger single TB and a ported manifold against the ITBs and compare.

And again, this is with a Haltech, not a stock ECM.

Last, good luck with the airfilter on that thing.

 

you keep talking about this aftermarket ecu stuff. when the 4cycle honda guys do it they tee the map sensor to each tb, thats how they use stock ecu

 

And the TL is DBW. How do you plan on running a throttle cable or getting past the CEL it's going to set?

And again, this will leave the EGR non functional, disable traction control, make a custom airbox mandatory, PCV non functional, and a host of other problems.

Why go through all this when you can get a bigger single TB and port the factory manifold for the same gains.

If this were adding 150hp maybe it would be worth the hassle.

 

oops i forgot the newer tls were dbw. anyway i been thinking about headache of itbs and after this high compression build ill may just be out of money so will end up using a 100mm tb and custom manifold