Jdm dc2r, boring out throttle body

**dslt** · 03-12-2007 03:28 PM

Hey guys, at work today my mate was telling me to bore out my throttle body or whatever it is, not exactly sure what it's meant to do. He was telling me it will give me better throttle response. Could someone please give me a better explanation n how will it affect my performance? Also where abouts in melbourne can i get this done

Cheers =)

**yellow-dc2** · 03-12-2007 06:55 PM

The idea is to increase the diameter and create a Venturi effect which allows for high flow and air transfer through your throttle body to allow more air flow, more air flow then creates better response and in some cases considerable power gains. it is very common to do this on Honda's and isn't that expensive $100 to $200 from memory.

I havn't had it done for a while so i don't know anyone in Melbourne anymore, maybe just ring a couple of mechanics and ask if they know someone, and find a reputable company as it can be done the wrong way, but its rear.

**yellow-dc2** · 03-12-2007 07:04 PM

This is a crude picture i drew to explain the Venturi

As air enters it is almost compressed as the path narrows then it creates a higher flow when exiting, i don't know the exact scientific explanation but thats basically the way it works.

**dslt** · 03-12-2007 08:10 PM

Thanks for the the info guys, So if i get this done is it a 50/50 chance that i might lose some throttle response? or is a definate gain
=)

**yellow-dc2** · 03-12-2007 08:29 PM

It can only make things better, as long as you don't go over board to the point that your ECU doesn't understand whats happening there will only be gains.

It will also work even better with a full exhaust.

If you Generalize it, try and think of your engine as an air compressor, the more air you can pump through the more performance you will get, so induction and exhaust are a good start.

**tinkerbell** · 03-12-2007 08:31 PM

you will gain throttle response, but it will mean you have to put your foot down 40% instead of 50% to get the same acceleration... (i.e. you gain "throttle response")

bored throttle bodies are only required after serious modifications to improve volumetric efficency...

**tinkerbell** · 03-12-2007 08:34 PM

Originally Posted by yellow-dc2

It can only make things better,

nah, that is just an illusion, it wont make any more power on a stock engine, it will only change how much he has to put his right foot down... (unless he has soem serious modifications to the internals already...)

**yellow-dc2** · 03-12-2007 08:35 PM

Originally Posted by tinkerbell

you will gain throttle response, but it will mean you have to put your foot down 40% instead of 50% to get the same acceleration... (i.e. you gain "throttle response")

bored throttle bodies are only required after serious modifications to improve volumetric efficency...

I'm not even going to bother

**Toy Honda** · 04-12-2007 06:56 AM

Originally Posted by tinkerbell

nah, that is just an illusion, it wont make any more power on a stock engine, it will only change how much he has to put his right foot down... (unless he has soem serious modifications to the internals already...)

Thats actually incorrect! I have never seen an upgraded throttle body NOT produce more power on the dyno, in most cases you will have to get an exhaust done as well but even a cat back will help.

It is a myth that the engine needs internal work to cope with higher air flow. as Yellow-dc2 stated exhaust and induction is a good place to start, then work your internals if your serous about making more power

**yellow-dc2** · 04-12-2007 07:24 AM

Originally Posted by Toy Honda

Thats actually incorrect! I have never seen an upgraded throttle body NOT produce more power on the dyno, in most cases you will have to get an exhaust done as well but even a cat back will help.

It is a myth that the engine needs internal work to cope with higher air flow. as Yellow-dc2 stated exhaust and induction is a good place to start, then work your internals if your serous about making more power

Thank you for saying what i couldn't be bothered, I would rep you if i could

just to further add

You might want to try these guys
http://www.efihardware.com/
There just in Blackburn i think, and do all sorts of custom setups, if they don't actually bore them out them selfs they should know someone who does.

**tinkerbell** · 04-12-2007 07:42 AM

Originally Posted by Toy Honda

Thats actually incorrect! I have never seen an upgraded throttle body NOT produce more power on the dyno, in most cases you will have to get an exhaust done as well but even a cat back will help.

It is a myth that the engine needs internal work to cope with higher air flow. as Yellow-dc2 stated exhaust and induction is a good place to start, then work your internals if your serous about making more power

interesting, so a stock engine will make more power with just a larger throttle body? I wonder why honda sold cars with lower power than was possible? Why dont hondas all come with 65mm throttle bodies? Can you explain why you seem to believe that the honda throttle body is a source of restriction? (and for bonus points, maybe you could discuss port matching the throttle body to the intake manifold once it has been bored out. You know, which might also help the guy with his original question?)

**Kiz_EG6** · 04-12-2007 08:15 AM

Originally Posted by tinkerbell

interesting, so a stock engine will make more power with just a larger throttle body? I wonder why honda sold cars with lower power than was possible? Why dont hondas all come with 65mm throttle bodies? Can you explain why you seem to believe that the honda throttle body is a source of restriction? (and for bonus points, maybe you could discuss port matching the throttle body to the intake manifold once it has been bored out. You know, which might also help the guy with his original question?)

...so if what you are saying is correct, then tell me why honda did not bring all their cars out with factory 4:1 extractors, as these make more power also, it's all about the cost and economy isn't it genious!?!

I would class a throttle body as a bolt on mod and there are plenty of bolt on's which honda could have released their cars with factory standard, which make more power, why don't they release them with a leaner fuel map too?