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View Full Version : best size throtle body for B18C7


big tone
18-09-2007, 02:44 PM
i see alot of ppl saying go the biggest tb you can get (more air flow) then i see alot of ppl also saying not to go big caus its no good( too doughy down low)
my application will mainly be for street and drag

SO, what size throttle body would be best for
B18C7
with stage 2 crower cams
cam gears
4-2-1 x-force headers
2 1/2" exhaust
s300 hondata
fatboyz39
18-09-2007, 04:29 PM
Either 65mm or 68mm.

65mm won't require the intake manifold to be bored out.

Ill go for 65mm thorttle body.

What intake system you running?
big tone
18-09-2007, 08:39 PM
Either 65mm or 68mm.

65mm won't require the intake manifold to be bored out.

Ill go for 65mm thorttle body.

What intake system you running?

itr, thats it. still susing out that as well weather to leave it or get something else that wil work better.
big tone
19-09-2007, 06:56 PM
Either 65mm or 68mm.

65mm won't require the intake manifold to be bored out.

Ill go for 65mm thorttle body.

What intake system you running?

why do you recomend 65mm tb and not 68mm

whats the difference other than the im being bored out.
is a 70mm too big
Waggy
19-09-2007, 09:00 PM
I've been recently told that a 70mm is a good way to go. Just make sure the IM is port matched.
big tone
19-09-2007, 10:58 PM
I've been recently told that a 70mm is a good way to go. Just make sure the IM is port matched.

I need reason's on why it is better as we are both after the same thing
i want mid to top end power (torque) the theory behind the sizes would be good.
SPEEDCORE
20-09-2007, 01:51 PM
The theory behind sizes is flow vs air speed.

People are also mentioning sizes.... are you measuring at the plate?
Professional
21-09-2007, 02:26 AM
B18C7 is Type R engine. I think 70mm is the biggest size for Type R IM. Also, you got Cams, Exhuast and ECU. For the TB, i think 70mm is the best or you got some spare money, get a Quad throttle (You will surprise). If you want to get more Quad throttle's info, you may ask "barefootbonzai" in this forum. He got Quad throttle in his B18CR before. Just my opinion.
Professional
21-09-2007, 02:27 AM
Just found the link:
http://www.ozhonda.com/forum/showthread.php?t=55347
fatboyz39
21-09-2007, 12:20 PM
Biggest Bore size you mean by 70mm?

Ditch those headers and get some better ones. e.g buddy clubs, toda and etc.

As for cams? how big are they compare to other cams? i.e ITR ones
SPEEDCORE
21-09-2007, 12:27 PM
http://www.crower.com/cat/import/honda/cams/b_vtec.shtml
big tone
21-09-2007, 04:53 PM
Biggest Bore size you mean by 70mm?

Ditch those headers and get some better ones. e.g buddy clubs, toda and etc.

As for cams? how big are they compare to other cams? i.e ITR ones

but where will i get gains with 70mm bottom, middle, top or all round gains as compare to a 65mm tb
big tone
21-09-2007, 04:55 PM
Ditch those headers and get some better ones. e.g buddy clubs, toda and etc.

yeah i know bout that one, they were really cheap so they will do for now but i will be replacing them. (next year)
sung
22-09-2007, 10:22 AM
Biggest Bore size you mean by 70mm?

Ditch those headers and get some better ones. e.g buddy clubs, toda and etc.

As for cams? how big are they compare to other cams? i.e ITR ones


Just curious but how does buddy club compare to toda?
fatboyz39
22-09-2007, 03:25 PM
No idea how about power comparison.

But we have ran 13.6 @101MPH in our EG with stock ITR with bolt-on i.e custom dynodave headers, CAI and ECU.

Never like the idea of cams in stock ITR motors.
todaek9
22-09-2007, 08:55 PM
Agreed...



No idea how about power comparison.

But we have ran 13.6 @101MPH in our EG with stock ITR with bolt-on i.e custom dynodave headers, CAI and ECU.

Never like the idea of cams in stock ITR motors.
big tone
24-09-2007, 10:17 PM
Never like the idea of cams in stock ITR motors.

why's that is there no gains?

do you recon the 70mm tb would work on B18c7 with the set up i'm goin to have?
fatboyz39
24-09-2007, 10:32 PM
why's that is there no gains?

do you recon the 70mm tb would work on B18c7 with the set up i'm goin to have?

Seriously no idea whether it'll work or not. Never used those cams so no clue.

For all i know, stock throttle body works well with stock motor with bolt-ons.

Best to get onto the dyno and have a few different size throttle body and test it on there. Should take no more then 30min to change over throttle body.