I'm in the process of sourcing all the parts for my N/A build. I'm planning Type-S pistons, cams, P&P head, Hondata etc etc, but don't known what size throttle body to go with.
IIRC the stock TB is 60mm and the Type-S is 62mm, but I've seen various aftermarket ones with 65, 68, 70 and 72mm diameters. Is there an optimum size for building N/A, and is it possible to go to big?

 

Yeah its possible to go too big.

Post your setup and then we will tell you whats best.

 

Cheers, here's my planned setup.
P.S. items marked with ** I haven't done yet.

1993 JDM 2.2 VTEC

BMC CDA Intake
Fujitsubo Super Ex exhaust manifold with 2.25" collector
Tanabe exhaust system (2.25")
Decat pipe (2.25")
**Port & Polished head
**Port matched intake manifold with Hondata heat shield
Type-S Pistons & rods
**Skunk2 Stage 2 cams & valvetrain (or maybe Crower Stage 2)
**Skunk2 SS high compression valves
Skunk2 Cam gears
Hondata S300 with P72
Throttle Body???

I think that's it for the engine side of it

 

oOo...i wanna know mine too!

AEM CAI
Euro-R Intake Manifold
SMSP Header (2.5")
Magnaflow Hi-Flow cat (2.5")
Mugen Exhaust (2.36")
Port & Polished Head
Euro-R Camshafts
Fidanza Camgears
SuperTech Valvetrain
Type-S Pistons OS Bore
Hondata s300 w/ p28
Throttle Body Bore ???

 

Are you all going to change the Intake manifold at all?

For the first setup, i would use 65-68mm and have it port matched to the intake manifold.

For the second one, i'd use 68-70 portmatched to the manifold. And i would also lookin into more agressive cams for that setup.


I guess it also depends on how agressive the head porting will be also. If you just do a minor port and polish, the TB might be too big.

 

i'd go no lower than 68mm on the first setup. 70mm on the 2nd setup.

stock H is 62mm

make sure you get it port matched to the IM

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Weather Man &raquo;</TD></TR><TR><TD CLASS="quote">Are you all going to change the Intake manifold at all?

I guess it also depends on how agressive the head porting will be also. If you just do a minor port and polish, the TB might be too big. </TD></TR></TABLE>

Yes, I'll be running a Euro-R Intake Manifold

Stage 3 P&P

http://www.laskeyracing.com/shop/portflow.htm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">i'd go no lower than 68mm on the first setup. 70mm on the 2nd setup.

stock H is 62mm

make sure you get it port matched to the IM </TD></TR></TABLE>

do you know how big the port is on the Euro-R IM?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Weather Man &raquo;</TD></TR><TR><TD CLASS="quote">Are you all going to change the Intake manifold at all?

For the first setup, i would use 65-68mm and have it port matched to the intake manifold.

For the second one, i'd use 68-70 portmatched to the manifold. And i would also lookin into more agressive cams for that setup.


I guess it also depends on how agressive the head porting will be also. If you just do a minor port and polish, the TB might be too big. </TD></TR></TABLE>

what numbers are you punching to come up with this crap dude?? you have no idea what kinda flow the head does and what those cams require, so where are you getting this info

you could not go wrong with any choice up there, the bigger the better, go 70mm

and that my friends is straight out of the mouth itself, braz @ RLZ

 

70mm=2.8"

Should my Intake piping be bigger than my exhaust piping? (2.8" intake --&gt; 2.5" exhaust)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The Weather Man &raquo;</TD></TR><TR><TD CLASS="quote">Are you all going to change the Intake manifold at all?

For the first setup, i would use 65-68mm and have it port matched to the intake manifold.
</TD></TR></TABLE>

I was going to keep the stock Prelude IM as I didn't want to loose the IAB function, but I was planning to have it ported & port-matched to the TB and engine.
If I did get a 68 or 70mm TB then, would I be able to get the stock inlet manifold ported out that big to match it?

 

yes you could, either professionally or DIY, i did it myself...

 

I would have thought going with ITBs if you have the money would be best