Throttle body size - Honda Prelude Forum

aboone78 · 04-11-2010, 06:51 PM

Hi all.I am planning on getting a skunk2 throttle body and intake manifold.My goal is just to have one bad N/A motor

.my question is what size TB should i get that will be good for my goal since bigger isnt always better depending on what you are trying to accomplish.the IM inlet is 64mm in diameter so i was thinking anywhere from 64 to 68 and i can port the IM to match.any input is helpful.Thanks again.

dontbuyprelude · 04-14-2010, 05:03 PM

70mm?

and you should probably try the na forum

Kronn 98SH · 04-14-2010, 08:10 PM

Everything I've read says 70mm is too big for N/A, especially with mild mods. I'd look into 65-68mm.

aboone78 · 04-15-2010, 10:33 AM

Quote:

Originally Posted by dontbuyprelude

70mm?

and you should probably try the na forum

my bad.i wasnt sure if this should go under 5th gen or N/A.

aboone78 · 04-15-2010, 10:34 AM

Quote:

Originally Posted by Kronn 98SH

Everything I've read says 70mm is too big for N/A, especially with mild mods. I'd look into 65-68mm.

thats kinda what i was thinking but wasnt sure.ill try and find more info on what will be better for me.thanks

ole kyle · 05-03-2010, 11:34 PM

i have read a couple different post from ppl that have put a S2000 TB on their preludes. the S2000 TB is a 80mm TB. i am still debating on putting that on my prelude now. i dont see how goin that big could be a problem.

Kronn 98SH · 05-04-2010, 12:48 AM

Quote:

Originally Posted by ole kyle

i have read a couple different post from ppl that have put a S2000 TB on their preludes. the S2000 TB is a 80mm TB. i am still debating on putting that on my prelude now. i dont see how goin that big could be a problem.

The stock USDM Prelude has a 60mm TB and the S2000 is 62mm.

SH DRIVER · 05-25-2010, 09:50 AM

On a 4cyl engine only one of the 4 intake runners is demanding air at any time.If you were to compare the diameter of the stock throttle body to the diameter of one of the intake runners, I think you would conclude that the stock throttle body is not restrictive and installing a larger one will not give you a boost in power and will have a negative effect on throttle response. I find under some atmospheric conditions, when accelerating prior to the 4800rpm vtec change over point you can get more acceleration by holding the throttle open only about 4/5 of the way until you cross the vtec change over rpm point.This is because a smaller throttle opening at lower and mid rpms acts to help speed up the air flow resulting in a faster build up of engine torque.The air valve at the input of the air filter element on the stock air intake performs the same function of acting to speed up the air flow at lower and mid rpms by closing off one of the two air input passages at lower engine rpms.When it comes to throttle bodies , bigger is not always better.
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aboone78 · 05-25-2010, 10:00 AM

^ ya thats why i was asking because i know that bigger isnt always better but i would think surely a slightly bigger TB would help in some gains.nothing huge like a 70mm or something like that but maybe a 64 or so.

dontbuyprelude · 05-26-2010, 01:05 AM

Quote:

Originally Posted by SH DRIVER

On a 4cyl engine only one of the 4 intake runners is demanding air at any time.If you were to compare the diameter of the stock throttle body to the diameter of one of the intake runners, I think you would conclude that the stock throttle body is not restrictive and installing a larger one will not give you a boost in power and will have a negative effect on throttle response. I find under some atmospheric conditions, when accelerating prior to the 4800rpm vtec change over point you can get more acceleration by holding the throttle open only about 4/5 of the way until you cross the vtec change over rpm point.This is because a smaller throttle opening at lower and mid rpms acts to help speed up the air flow resulting in a faster build up of engine torque.The air valve at the input of the air filter element on the stock air intake performs the same function of acting to speed up the air flow at lower and mid rpms by closing off one of the two air input passages at lower engine rpms.When it comes to throttle bodies , bigger is not always better.
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except vtec crossover is 5200 rpms. the iabv opens at 4800

cena2020 · 05-26-2010, 06:21 AM

Ford Mustang 1999 - 2004 3.8L V6

Type Size Year Part # Price
Ford Throttle Body 65mm 99-00 F65V6-1 $ 289.99
Ford Throttle Body 65mm 01-04 F65V6-2 $ 289.99
Ford Throttle Body 70mm 99-00 F70V6-1 $ 299.99
Ford Throttle Body 70mm 01-04 F70V6-2 $ 299.99

Ford Mustang 1986-1993 5.0L 65mm to 105mm

In the product descriptions below, EGR refers to a 2" EGR spacer with vacuum tubes and water passages. Blank refers to a 2" blank spacer with no EGR provisions or water passages. The throttle body is sold individually or boxed in a kit which includes a 2" EGR or blank spacer. All gaskets included.

Also, Accufab offers a race throttle body which measures 65, 70, 75, 80, 85 or 90mm size at the blade and it opens up to 90mm at the inlet. It requires a fabricated hose or tube from filter or supercharger and it does not have a vacuum provision.

Call our TechLine at 909-930-1751 for assistance in choosing the right throttle body for your application.
========================================
Organic Seo |Christian Seo

blue_01 · 09-09-2010, 11:48 PM

is it really effective if i use a throttle to my engine? cause i heard that this throttle body spacers increases and decreases the engine's power. is that really true? just wanna ask for some advise if i should buy this part of a car and to be added in my car to boost up! thanks.

_____________
miyata

aboone78 · 09-10-2010, 04:57 AM

Quote:

Originally Posted by blue_01

is it really effective if i use a throttle to my engine? cause i heard that this throttle body spacers increases and decreases the engine's power. is that really true? just wanna ask for some advise if i should buy this part of a car and to be added in my car to boost up! thanks.

_____________
miyata

1.Don't revive dead threads
2.Don't ask questions on someone elses thread, start your own
3.Throttle Body spacers don't do SH!T!

CTrees · 09-10-2010, 02:50 PM

Quote:

Originally Posted by SH DRIVER

I find under some atmospheric conditions, when accelerating prior to the 4800rpm vtec change over point you can get more acceleration by holding the throttle open only about 4/5 of the way until you cross the vtec change over rpm point.

I've felt that too, thanks for being able to articulate what was going on there. I also get a nice hissing sound from the intake at 4/5 or around there.