top mount vs front mount
31 August 2017, 10:56 AM
#1
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top mount vs front mount
Morning all.
Not the usual "Do I need a front mount intercooler?" this time.
I'm interested to hear peoples' thoughts on whether or not changing to a front mount intercooler really does make a tangible difference to the amount of turbo lag.
Obviously, there's a larger volume to get the gas through, which could easily be more than 4 times the volume of the standard tmic on imprezas.
However, thinking about this logically, the speed at which a turbo moves air would surely fill up the extra intercooler volume in next to no time, wouldn't it?
Not the usual "Do I need a front mount intercooler?" this time.
I'm interested to hear peoples' thoughts on whether or not changing to a front mount intercooler really does make a tangible difference to the amount of turbo lag.
Obviously, there's a larger volume to get the gas through, which could easily be more than 4 times the volume of the standard tmic on imprezas.
However, thinking about this logically, the speed at which a turbo moves air would surely fill up the extra intercooler volume in next to no time, wouldn't it?
31 August 2017, 12:27 PM
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31 August 2017, 12:34 PM
#4
front mount gives colder air temps as top mount can suffer from heat soak. mapper can advance the timing a bit more with a front mount as the air is colder and denser so you gain a bit more power but with some added lag.
Last edited by yabbadoo4; 31 August 2017 at 12:37 PM.
31 August 2017, 12:59 PM
#5
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front mount causing any noticable lag is a myth or a poor setup/map
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you've got me there mate,,,he's driving a WRX so max safe power would around 350bhp so fitting a fmic would be a waste of time and money just fit STI TMIC job done
31 August 2017, 07:04 PM
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Top of the engine is a really crap place for an intercooler.
04 September 2017, 09:27 AM
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04 September 2017, 09:30 AM
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Thanks all... sounds like I was thinking along the right lines.
One other question though.. having decided that there is little to no extra lag when switching to a front mount, what about the size of the piping?
From what I understand, for a given quantity of air, the smaller the i/d of the pipe, the faster the air has to move to achieve the same flow as it would on a larger i/d pipe.
if there any benefit to fitting 3" diameter piping, as opposed to 2.5" or 2"?
the only thing I can think of is that the smaller the pipe, the faster the air moves, and therefore the hotter it will be, so surely bigger i'd must be better, or is there more to it than that?
One other question though.. having decided that there is little to no extra lag when switching to a front mount, what about the size of the piping?
From what I understand, for a given quantity of air, the smaller the i/d of the pipe, the faster the air has to move to achieve the same flow as it would on a larger i/d pipe.
if there any benefit to fitting 3" diameter piping, as opposed to 2.5" or 2"?
the only thing I can think of is that the smaller the pipe, the faster the air moves, and therefore the hotter it will be, so surely bigger i'd must be better, or is there more to it than that?