I see people get spoon tapered to stock bore throttle bodies...

And I see people overboring their stock TB's...

And I see aftermarket TB's that are even 6mm or so bigger in diameter.....

What if you got something like a 90mm throttle body? Would it even make sense to have such a thing on a 1.8L like the b18c5?

Or does it depend on the application? NA vs. S/C vs. NOS vs. b00st.....?

 

NOS y0

A 90mm TB might be good @ 18k rpm.....

 

i like small throttle bodies, 4 of em. quantity over quality y0!

 

yeah..90mm might be excessive...

one of those most important aspects of air flow is velocity...

can you say bog?

 

.....well I saw the darndest thing today:

a jdm setup with... 90mm throttle body on a b-series motor that is NA, with a custom intake manifold.

I *might* be able to post up pics if I get approval...

 

You've been approved

 

Jesus.

Whats your throttle response like?

 

LOL; that is NOT my motor...I have a Spoon TB for my B16A.

Wouldn't mind taking a stab at that mini-surge tank/IM thingy though

 

My theory would be sizing your throttle body should be proportionate to what kind of driving you're doing. a 90 mm throttle body is probably for something that revs over 10k rpm.

I think you want a compromise between going larger and keeping your intake air velocity up. Remember bigger isn't always necessarily better-talking about throttle bodies now, HEY! haha

 

tappered sucks! what would a size of a throttle body be to be equal to the diameter of the intake manif? in other words, whats the inside diameter of the intake manifold on a ITR?

 

Ericks revs up to 10,800rpms and he is still running 70mm TB ..
how much help with a 90mm

 

what factory TB can u overbore to 90?
DOesnt look like a 90mm TB to me

 

Unless hes running something other than what he sells, its a 68mm TB tapered
from 70. Also its a 2+L motor, which can make use of it. A 1.8L most likely
wont be able to.

I dynod a 1.8 ITR today and the TB made 0 difference. No gain or loss whatsoever.

 

believe me he is running a 70mm TB .. not bigger then that ..

 

Like I said, 70mm opening, 68mm plate. Thats a 68mm TB.

 

sorry , i though for some reason i read something else ...
meeen! im tired and is also late but you are right ..
is the samething with the spoon TB same as the itr

 

I saw a ads that said the Jun IM come with a TB that is 90mm too!!

 

.....what size was the plate? IM ported to match?

 

Spoon is 70mm mouth and 62mm plate.

ITR is 66mm mouth 62mm plate.

 

70-68mm Ericks Racing TB
I wont even respond to the second question. You should already know the answer.

 

Yeah, but who knows what people bring you to tune aka FIX for them.....

 

I dont mess with that.