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Location:
Toowoomba
Registered:
September 2004
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Intercooler piping question?
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Fri, 30 September 2005 13:50
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I have a 1G-GTE setup in my RT-142.
With a small front mounted intercooler, the piping is 2.5' just from guessing.
I am getting a bigger IC but am not sure whether to get 2.5' or 3' inlet/outlet on the IC.
They both cost the same but I am thinking that the piping to set it up would be cheaper if I used 2.5'
I am not chasing huge horsepower figures but what limitations powerwise will a 2.5' setup have over a 3' one, if there is any?
Thanks
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Registered:
July 2005
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Re: Intercooler piping question?
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Fri, 30 September 2005 14:40
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2.5" will flow faster (boost earlier) but restrict top ed, if you end up maxxing the capacity of a 2.5" pipe.
wont be too much difference though.
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Location:
Brisbane
Registered:
July 2005
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Re: Intercooler piping question?
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Fri, 30 September 2005 22:22
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The cross-sectional area of a 3" pipe is about 40% bigger than 2.5" pipe, so in theory a 3" pipe can flow 40% more than a 2.5" pipe can.
Whether this will mean anything to your car will depend on what sort of turbo your using and what is your car used for.
Small stock turbos will mean you shouldnt need more than the 2.5" stuff as the flow they are capable of probably isnt as much as this pipe can handle. However if your planning on going to a big single, the smaller piping may considerable restrict your power levels.
Drag racing is all about top end power so bigger piping can be quite good for flow, whereas in track racing turbo response and a smooth torque curve may be much more useful to you than absolutle power.
I doubt there would be much of a price difference between the too pipes though. 2.5" may be smaller but 3" is much more popular. Alot of the cost in pipework is the labour which of course would be the same for either pipe size. 
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Location:
Pine Rivers QLD
Registered:
April 2005
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Re: Intercooler piping question?
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Sat, 01 October 2005 03:55
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the stock set up on my 1G-GTE conversion is only 2 inch not 2.5. so the outlet and inlet pipes the run along the top of the motor are only 2 inch, so unless your gonna make totally new customs runs i would only go the 2.5 IC. as the 3 inch is only gonna take longer to spool.
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Location:
Toowoomba
Registered:
September 2004
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Re: Intercooler piping question?
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Sat, 01 October 2005 08:56
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Because of my standard diff and manual boost controller she is a bit laggy but they will get sorted out soon.
Still not sure what size to go for, maybe 2.5' will do as I don't plan on getting a big single turbo even though it would be nice.
Thanks
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Location:
Adelaide, SA
Registered:
May 2002
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Re: Intercooler piping question?
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Sun, 02 October 2005 01:24
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Why bother getting 2.5" pipe work when the standard stuff is only 2"? Just wasting money IMHO.
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Location:
Brisbane
Registered:
May 2002
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Re: Intercooler piping question?
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Sun, 02 October 2005 11:05
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How big is your throttle body? If it's smaller than 3" there's no point using 3" pipes.
In fact generally speaking 3" pipes are a waste of time unless you're going big turbo/crazy horsepower. You'd have to be pushing a LOT of air before 2.5" pipe became a restriction. Also you'd be surprised how much harder it is to route 3" pipe around the engine bay compared to 2.5" pipe.
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Location:
Hobart, Tas
Registered:
May 2002
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Location:
Brisbane
Registered:
May 2002
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Re: Intercooler piping question?
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Sun, 02 October 2005 12:30
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It will make SFA difference performance-wise, so just use whatever is easiest. I guess if the IC has 2.5" outlets, 2.5" pipes would be easiest.
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Location:
Hobart, Tas
Registered:
May 2002
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Re: Intercooler piping question?
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Mon, 03 October 2005 08:19
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| Norbie wrote on Sun, 02 October 2005 22:30 |
It will make SFA difference performance-wise, so just use whatever is easiest. I guess if the IC has 2.5" outlets, 2.5" pipes would be easiest.
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Thanks. The 1G Intake piping that sits on top of the cam covers is 2" anyway, so either way I'll need 2.5" --> 2" reducers. 2" for easy routing it is!
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Location:
Toowoomba
Registered:
September 2004
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Re: Intercooler piping question?
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Fri, 07 October 2005 12:12
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Looks like 2.5" would be the logical choice, I was waiting for a good solid reply.
Thanks Norbie
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Registered:
June 2003
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Re: Intercooler piping question?
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Fri, 07 October 2005 13:08
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I just got my cooler piping done in 2.5 inch. Unless you're running more than 300rwkw, you're not going to see the restriction from a 2.5 inch pipe.
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