throttle body selection...

**AXS** · 08-01-2010 03:43 AM

hey guys im looking to upgrade my throttle body on my egb18r, atm it has a injen intake, full exhaust, fuel pump. i want to upgrade to a skunk2 throttle body and inlet manifold, just wondering what size throttle body would you guys suggest, 68mm? 70mm? it will be tuned soon after

cheers

**EKhatchguy** · 08-01-2010 04:48 AM

Unless you are going with some crazy N/A build, or boost, your stock one should be just fine.

If you end up getting one that big, expect your throttle response to be killed.

**AXS** · 08-01-2010 05:25 AM

Originally Posted by EKhatchguy

Unless you are going with some crazy N/A build, or boost, your stock one should be just fine.

If you end up getting one that big, expect your throttle response to be killed.

so your telling me i will not gain any power what so ever? and when you mean killed, will it be that bad?

**EKhatchguy** · 08-01-2010 05:36 AM

You may gain power in the higher rpms if you just slap it on.

Think about like this... You have x amount of water (doesn't matter how much for the example).

You put it through a 1" hose and it shoots out due to the pressure/velocity etc.

You take the same amount of water and put it through a 2" hose, and it'll dribble out for the most part.

Kinda like the same thing here. You engine needs X amount of air at certain rpms. A smaller TB will allow that air to rush in faster, but you will be limited with the maximum amount of air it can possibly flwo at one time.

If you get a bigger TB, the air in the lower rpms will have the velocity compared to the water in the bigger hose.

Your stock one is 60mm I believe. I have two questions for you now...

1. What do you plan to do with this car? If you do plan on a big turbo/boost set-up, I would go with a 66mm.

2. You say you have an aftermarket/upgraded Intake manifold? How big is the hole where it connects to the TB? If it is 62mm, putting on a 68mm TB won't do anything unless the intake manifold is bored to the same size. Your intake system will only be as free fliwing as your most restrictive part.

Hope that helps.

**AXS** · 08-01-2010 06:11 AM

Originally Posted by EKhatchguy

You may gain power in the higher rpms if you just slap it on.

Think about like this... You have x amount of water (doesn't matter how much for the example).

You put it through a 1" hose and it shoots out due to the pressure/velocity etc.

You take the same amount of water and put it through a 2" hose, and it'll dribble out for the most part.

Kinda like the same thing here. You engine needs X amount of air at certain rpms. A smaller TB will allow that air to rush in faster, but you will be limited with the maximum amount of air it can possibly flwo at one time.

If you get a bigger TB, the air in the lower rpms will have the velocity compared to the water in the bigger hose.

Your stock one is 60mm I believe. I have two questions for you now...

1. What do you plan to do with this car? If you do plan on a big turbo/boost set-up, I would go with a 66mm.

2. You say you have an aftermarket/upgraded Intake manifold? How big is the hole where it connects to the TB? If it is 62mm, putting on a 68mm TB won't do anything unless the intake manifold is bored to the same size. Your intake system will only be as free fliwing as your most restrictive part.

Hope that helps.

btw b18c7 tb is 62mm

example understood, but i do not see it that way, maybe because your using water as an example....

anyways the car will be a street car, i will be upgrading the inlet manifold and TB at the same time, skunk2 is the brand i will be going towards.

A #1. it will not be boosted, or no internal work will be done at this stage anyway, merely tuned with i/h/e and tb.

A #2. the hole is 74mm (skunk2)

**90LAN** · 08-01-2010 07:57 AM

SPOON 70mm>>>64mm oem quality and fitment
and with brand new sensors
for around the small price as other tb

**Cooker** · 08-01-2010 09:37 AM

When will people leave the whole IM and TB thing on fairly stock engines ALONE!!!!
YOU WILL GAIN ***K ALL POWER!!!! WASTE OF TIME.
Don't believe me?? Go to the dyno with your wanky 9000mm throttle body. Do a run with the OEM one then do one with the one 9000mm throttle body and see yourself how much power you don't gain.
Throttle response will be improved and you will "think" you have more power due to the fact that you don't have to push your foot down as much to get the same amount of air in then the smaller TB. But go to a dyno and you will see that on a mildly built engine you will gain 0, I repeat 0hp.

PEOPLE, PLEASE, LEAVE THE OEM TB AN IM ALONE, UNLESS YOU HAVE A FULLY BUILT BALLISTIC N/A SCREAMER!!!
And no, having Buddy club stage 2 in your B18CR or ITR cams in a B16a does not meet this N/A screamer criteria lol

**90LAN** · 08-01-2010 12:04 PM

Originally Posted by Cooker

When will people leave the whole IM and TB thing on fairly stock engines ALONE!!!!
YOU WILL GAIN ***K ALL POWER!!!! WASTE OF TIME.
Don't believe me?? Go to the dyno with your wanky 9000mm throttle body. Do a run with the OEM one then do one with the one 9000mm throttle body and see yourself how much power you don't gain.
Throttle response will be improved and you will "think" you have more power due to the fact that you don't have to push your foot down as much to get the same amount of air in then the smaller TB. But go to a dyno and you will see that on a mildly built engine you will gain 0, I repeat 0hp.

PEOPLE, PLEASE, LEAVE THE OEM TB AN IM ALONE, UNLESS YOU HAVE A FULLY BUILT BALLISTIC N/A SCREAMER!!!
And no, having Buddy club stage 2 in your B18CR or ITR cams in a B16a does not meet this N/A screamer criteria lol

your engine must of been a dud then lol

**NightKids** · 08-01-2010 02:34 PM

Originally Posted by 90LAN

your engine must of been a dud then lol

haha that.

**dougie_504** · 09-01-2010 02:04 AM

Originally Posted by AXS

hey guys im looking to upgrade my throttle body on my egb18r, atm it has a injen intake, full exhaust, fuel pump. i want to upgrade to a skunk2 throttle body and inlet manifold, just wondering what size throttle body would you guys suggest, 68mm? 70mm? it will be tuned soon after

cheers

That will set you back like $600-700 right?

I recommend just getting a lightweight flywheel, better final drive or some light internal work.

IM and TB isn't really worthwhile unless you're gonna put massive money into the engine.

**bennjamin** · 09-01-2010 09:47 AM

another IMO

A throttle body upgrade....isnt needed or warranted for standard / mild even worked engines. So do dont waste your money on it

**Lukezen27** · 09-01-2010 05:45 PM

Originally Posted by bennjamin

another IMO

A throttle body upgrade....isnt needed or warranted for standard / mild even worked engines. So do dont waste your money on it

Originally Posted by AXS

hey guys im looking to upgrade my throttle body on my egb18r, atm it has a injen intake, full exhaust, fuel pump. i want to upgrade to a skunk2 throttle body and inlet manifold, just wondering what size throttle body would you guys suggest, 68mm? 70mm? it will be tuned soon after

cheers

BAH

I'm running stock 60mm IM on my boosted B16A