before I buy anything I figured I'd ask some pros. What size throttle body should I get?
my set up:
stock b18c1 block
dpr stage 6 headwork
itr cams
hondata s200
dc jdm 4-1 header
2.5" cat
rsr cat back
skunk 2 IM

I figure my compression is somewhere in the low 11's, I'd like to make somewhere in the 190-200 whp range. I know the inlet of my skunk 2 IM is 64mm, so should I get my stock gsr throttle body bored to 64 mm, or would there be a better option. Any reason to go bigger then 64mm?
Thanks

 

stock comp. stick with the 64mm if you raise your comp. and put big cams you can go up to 70mm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DarkSolPR &raquo;</TD></TR><TR><TD CLASS="quote">stock comp. stick with the 64mm if you raise your comp. and put big cams you can go up to 70mm</TD></TR></TABLE>

the compression really has nothing to do with the amout of air being drawn into the engine with the stuff you listed i would get the biggest you can find as long the price is in reason

 

65mm - 68mm should be fine

 

compression is not stock, dpr stage 6 headwork has rewelded combustion chambers. My compression is somewhere in the low 11's. Why go bigger than a 64mm throttle body when the inlet of the skunk 2 IM is 64mm? What is the advantage?

 

You could always port match the IM. Try Maxbore.com if you were considering boring out your stock TB.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by foot &raquo;</TD></TR><TR><TD CLASS="quote">You could always port match the IM. Try Maxbore.com if you were considering boring out your stock TB.</TD></TR></TABLE>

That's what I was planning on doing. Does port matching the tb just mean aligning it exactely with the inlet of the IM? is this necessary if I have a 64mm TB and a 64mm inlet on my IM?

 

If you get a TB that is larger that the inlet on your IM then you can just dremel off the excess material. If you are using a TB that is the same diameter as the IM inlet than it isn't really necessary. However, I have seen some people port the IM inlet anyway to maximize flow. I would think this would require some experience, more than I have anyway. You may want to get more information from some experienced porters.