Well it's really up to you Yannis!
It will run fine with 3" pipes/couplers but my thoughts are it will be nicer to drive with the pipes optimised.
My car using the small pipes even at 1 psi is really responsive and is easily making 22 psi/460 rwhp without choking.
"Lag" is often too...
3" will drop velocity to 0.18 mach and this will be noticable!
I'd use a reducer coupler from 2.25">3.0" in and out of the IC the air is going to slow then accelerate through the IC no matter what you do but leading up to and out of it you want to keep it moving as fast as possible.
My IC...
Yannis: I did the calcs based on 40 lbs/min flow and to keep good velocity I come up with 2.25" pipes, this will give you 0.32 mach through the pipes well below the critical 0.40 mach point where friction becomes an issue.
Any bigger the velocity drops and you may feel it...
(just trying...
More than likely someone in the past has stripped it and pushed a rubber plug in :(
A bunch of options come to mind
Get another Cover with good threads
buy a big tap and retap it to the next size up (An imperial threaded domestic plug may be an option)
Find another rubber plug (last...
Ian are you reffering to the i/c inlet, that's 3" OD on my i/c, about 74-75mm ID.
The pipe from the Compressor Y to the IC, any bigger and you'll lose velocity and might "feel" perceived lag.
Well they're both the same 35-38mm ID on the comps and they'll both go to equal 50mm ID pipes...
Robbo: While I have NFI on the Maft Q's here's my take on the rest
It's your car you're paying for the dyno time so you can specify how many pulls and what types!
If they're doing something you don't like pull the pin as the dyno is a harsh artificial environment for a car and it can...
CS: LOL Nah Dave can have that headache all on his own!
AM: Thanks it was nice to be asked ;)
Drew :)
Shaeff: LOL already been though 95% of it ;)
PC88: Thanks.
92t4life: LOL "secret mens business"
Yannis: 2.250" into the IC will work well for your requirements, for the Comp outlets I'd just match ID's.
As for the IC itself you want something that will flow around the 1000 cfm mark or higher, volume will be up to you though.
1 bar isn't going to stress it too much.
ummm look up "TTY" :(
4' bar you may be exceeding the TTY on the bolt and correct it won't come loose but it may just decide to pop the head off one day.
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