Re: Start DIY ITB
 

Hmm..cbr600 has 4*38mm is like one 76mm. On honda acord type R stand 64mm trottle body and give 220hp.
Why i lose power?

2junkyard racer: i have a tuned ecu. i have mugen bin on BRE.I have a lighty ;D light flywheel made on stock.
But need more power. Needed ~180-190hp.

Re: Start DIY ITB
 

one 3" pipe will flow more air than two 2.5"

Re: Start DIY ITB
 

each throttle plate on the 38mm's take up 4534.16 millimeters

the 64mm throttle body's area is 3215.36 square millimeters

Re: Start DIY ITB
 

oh yeah? you have a tottal area of 7 square inches on the 3 inch pipe and 9.81 on the 2x2.5 inch pipes. I dont see how the 3 inch pipe could flow more, unless you're just being sarcastic.

Re: Start DIY ITB
 

i was being serious :)

Re: Start DIY ITB
 

I love your math



Now it doesnt work that ya


Under your thought process you could run 4 15mm tb's which wouldnt turn a hamster wheel which would equal a 60mm tb



classic


take a micrometer to your head ports on the b16a and tell me the port size and try again

Re: Start DIY ITB
 

did you get that chip from ebay for $7? thats a beast there.

Good luck on the build :)

Re: Start DIY ITB
 

bre is a a real editor that works and if its the real mugen bin it runs basic b16s pretty solid.

Re: Start DIY ITB
 

the real mugen tune is pretty weak honestly Chris. Unless your going to be 6k rpms on -> for long durations (N1)
There are many better options IMO.

Re: Start DIY ITB
 

Learn something about fluid flow dynamics, there's more to flow than just total internal area. One big pipe can outflow 2 medium sized pipes becuase of the difference in surface tension