When Does Changing The Thottle Body Become Necessary?

[yoshiii335]

Hello

I would like to know when it is good to change the thottle body to a larger one on a car?

I have a r32 gts-t I will build up to 400 hp. Do I need to do it for that?

[zebra]

Nope, not on a little RB20

[Ben C34]

Within reason, never.

[PN-Mad]

When your throttle is smaller than the outlet of the turbos comp cover?

[Missileman]

betcha you will never make it to 400hp

[Scott Black]

That's only 300rwkw or so, big enough turbo with enough boost should so it. Won't make power below 6k though

[AngryRB]

Before you spent too much on an RB20, consider an RB25 or RB30det, when the $$$ start flowing you only have a 2L as your base..

[GTSBoy]

We've already lost that argument with him. Apparently, this one time, at band camp.....I mean, in Japan, it's too expensive to use a 25.

[yoshiii335]

Before you spent too much on an RB20, consider an RB25 or RB30det, when the $$$ start flowing you only have a 2L as your base..

Ive thought about that but the cost of legally doing that here in Japan, the price is crazy. Have to go thru special registration, cost of having it put in, wiring, and pay extra money and have it re-inspected, etc. Also my road tax will almost triple.

The shop I spoke with about tuning the car once I decide what to do, suggested a 2.4 litre kit with a rb26 crank.

So I might just go 320-350 hp, and see how that is. If I want more than I will research more and maybe do the 2.4 litre kit.

Also I wasn't planning to buy a larger throttle body. I see them often over here on the car parts sites for the rb engines so I was wondering if anyone actually changed theirs.

Edited February 26, 2015 by yoshiii335

[yoshiii335]

We've already lost that argument with him. Apparently, this one time, at band camp.....I mean, in Japan, it's too expensive to use a 25.

Oy, as I said in the other post, if you dont have anything positive to say, please exit the stage.

[R_34]

I definitaly wouldn't stroke the 20.

Go 25 or just enjoy what the 20 will give you after some mods.

Stroking it will cost a lot, get less power and response than a 25, still have a weaker gearbox etc...

Definitely a no-no.

[yoshiii335]

I definitaly wouldn't stroke the 20.

Go 25 or just enjoy what the 20 will give you after some mods.

Stroking it will cost a lot, get less power and response than a 25, still have a weaker gearbox etc...

Definitely a no-no.

I definitaly wouldn't stroke the 20.

Go 25 or just enjoy what the 20 will give you after some mods.

Stroking it will cost a lot, get less power and response than a 25, still have a weaker gearbox etc...

Definitely a no-no.

Ok, I wasn't sold on the idea.

[GTSBoy]

Oy, as I said in the other post, if you dont have anything positive to say, please exit the stage.

f**k you're funny. Every few months you ask the same questions, get the same answers, do nothing about it, learn nothing. Rinse. Repeat.

[Scott Black]

I think anything about 35rwkw needs atleast a 350mm throttle body, general rule of thumb is about 10mm per rwkw

[gtr jet]

I think anything about 35rwkw needs atleast a 350mm throttle body, general rule of thumb is about 10mm per rwkw

Do you realise how big that its?

[Ben C34]

That's what she said.

[89CAL]

Do you realise how big that its?

He's right. You will definetly need a bigger throttle body for that power

[Jordy32]

350mm is 35cm by the way.. lol

[Ben C34]

I measure in hectometers. Please convert.

[Scott Black]

He's right. You will definetly need a bigger throttle body for that power

yeah about 1m per 100kw