intercooler piping diameter question

[mattrat]

ok so i was thinking and a thought came up in my head(how wierd) lol
anyway the diameter of the piping, does this affect the boost levels.
cause i feel 15 psi in a 2 inch pipe is a lot less than 15 psi in a 3 inch pipe..
do u get what im saying?
just couldnt work out what happens if it works the turbo harder on a big diameter pipe etc..
also does changing the diamter throught the piping affect performance aswell?
cheers Matt

 

[JayRome]

the bigger the diameter the pipe the more air required to fill that area... its the same pressure just the turbo works harder to fill the space...

ideal sizes for 4g63 turbo would be 2" hot side then 2.5" cold side, depending on how serious the mods are, but bigger isn't always better in intercooler pipe sizes....

 

[mattrat]

what about pipe variation?
cause i got alot of random pipes and stuff from gsrtoy and ive made up my own route etc.
just there is a 3 inch throttle body elbow which does down to a 2 inch (i think) pipe then to the i/c.
Matt

 

[CLuTZ]

Its all about flow. You want the least amount of restrictions as possible. Less bends and less restrictions, means higher efficiency. I.E your motor/turbo isnt working as hard for the same output.

 

[EVO85]

anyway the diameter of the piping, does this affect the boost levels.
cause i feel 15 psi in a 2 inch pipe is a lot less than 15 psi in a 3 inch pipe..
do u get what im saying?
just couldnt work out what happens if it works the turbo harder on a big diameter pipe etc..
also does changing the diamter throught the piping affect performance aswell?

Why are you using 3 inch intercooler pipes? I assume that your intercooler has a 3 inch inlet and outlet...? If you have massive HP, then 3 inch may be beneficial, but I can only imagine that all that this has created, is lag.

Changing intercooler pipes can increase performance with less bends and a smoother path to assist flow. Increasing intercooler pipe size will obviously yield HP gains if that is that is the weak link in your the current engine setup. There's really no point changing I/C pipes that can flow 350HP if your turbo can only support 300.

I have been using 2 inch pipes for years (because of increased response), but have upgraded all the supporting mods to the point where my 2 inch pipes are now restricting my power output. I had 198kw's at the front wheels and replaced the standard 'peashooter' 38mm throttle body elbow with a 63mm item and power jumped to 203kw's (same boost) whilst retaining the 2inch pipes. I am now installing cams and raising boost, so I have no choice but to upgrade to 2 1/2 inch pipes to make best use of all the other mods....

 

[GSR70Y]

After a little experimenting with my old setup which had the cold side pipe enlarge to a 3" intake. I changed it to a 2" cold side pipe, boost threshold was lowered because of the less air needed to fill that area meaning quicker acceleration. So now on my new setup, I've kept the hot side 2" and 2" cold side and then enlarges to 3" before the TB. I tried to use as little bends as possible, If you count the 45degree silicon joiner There is a total of 5 bends, where as my last setup had 7 and the piping was much longer.

 

[mattrat]

OI EVO85 my mate told me about a red cordia at a meet that was raping everyone....?
lol probs you..
anyway say if i have 2 1/4 all thge way except for my tb elblow which is one of gsrtoys 3 inch pipes it wont restrict flow? it might aid it as the psi in the 2 1/4 pipe will expand and provide smoother flow into the tb and runners?
im just trying to get the most info i can before i start boosting 15+ psi and still recieve gains..?
cheers Matt

 

[tUfRiCe]

2 1/4' hot...2.5' cold is wear its at

 

[CraigGSR]

I/C Plumbing

I have 2.5 hot and 2.5 cold. Runs pretty good and had a notable difference over standard. Just make sure its smooth and free flowing.

 

[dafurn]

I ve got a Meek kit and im assuming it ll perform ok or at least better than stock. :?

 

[brisvr4]

http://www.plazmaman.com/shop/index.php?action=listCategoryItems&catId=15

 

[GVR40]

is this in the gsr galant motor? if so that motor WILL NOT hold 15psi of boost unless it has been rebuilt with forged pistons etc and probably a lower compression

 

[mattrat]

nah bro ive rebuilt a vr4 engine..

 

[GVR40]

in that case, check out the plazmaman kits, i just got one for my vr4, very good kits, just get them to put the standard flange on for the BOV otherwise you will have a usless fitting the pipe

 

[SIVART]

2.5" to 2.5" is a good combo

it depends on your turbo setup, are you running a maf/afm?

stock cooler, 2.1/4 inch pipes and, a hybrid cooler 2.5

 

[Liberoz]

I would think once you take a ride in a 4g63t powered ride with 63mm o/d mandrel bent ic pipes and that will definately make all your minds up for good.

 

[SIVART]

I would think once you take a ride in a 4g63t powered ride with 63mm o/d mandrel bent ic pipes and that will definately make all your minds up for good.

dead right there, after I got Trikfab piping I could feel a massive increase in responce and power, and the piping is as light a feather to