fmic
28 January 2005, 11:33 PM
#4
The purpose of the FMIC is to reduce the charge temperature.
With a top mount there will be occassions where your induction air is at 50 deg C or more. Hot air is less dense and so you cannot develop full potential power output.
Perhaps more worrying should be the increased risk of DET because of the increased charge temperature.
With an FMIC, charge temps will be much reduced so there is potential for more power from the lower charge temperatures. The risk of DET from hot induction charge air is greatly reduced.
On my WRX, after a bit of heat management work, my induction temperature is now the same as ambient, in the cruise, at up to 4,500 rpm.
The strict answer to your question is that, if your top mount could feed air at the same temp as a FMIC then you would see no power gain but of course in a normal road going situation the top mount cannot do that.
With a top mount there will be occassions where your induction air is at 50 deg C or more. Hot air is less dense and so you cannot develop full potential power output.
Perhaps more worrying should be the increased risk of DET because of the increased charge temperature.
With an FMIC, charge temps will be much reduced so there is potential for more power from the lower charge temperatures. The risk of DET from hot induction charge air is greatly reduced.
On my WRX, after a bit of heat management work, my induction temperature is now the same as ambient, in the cruise, at up to 4,500 rpm.
The strict answer to your question is that, if your top mount could feed air at the same temp as a FMIC then you would see no power gain but of course in a normal road going situation the top mount cannot do that.
29 January 2005, 09:24 PM
#6
IMHO Not really. It may be better than standard if you choose the right one but it may well cost more than a reasonable FMIC (Hybrid = £565 currently). If your power aspirations are fairly close to standard then an improved top mount will probably suffice. After that I think you need to go to a capable FMIC for sustained WOT.
29 January 2005, 11:27 PM
#7
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Do you have to cut up the bumper to fit the fmic? Or is it just bolt on?? I assume that a different dumpvalve and induction would be needed?
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29 January 2005, 11:43 PM
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Originally Posted by chrispurvis100
Do you have to cut up the bumper to fit the fmic? Or is it just bolt on?? I assume that a different dumpvalve and induction would be needed?
had to cut a good bit of the front bumper away
& cut the inner wing for the pipes to run through
harvy u mentioned about heat management
would this apply to a top mount as well ??
Last edited by colby; 29 January 2005 at 11:46 PM.
30 January 2005, 09:32 PM
#9
Yes it applies to a top mount as well. Anything you can do to keep the heat away from the intercooler and the pipework carrying cold air to the throttle body will give some sort of gain. Just reducing under bonnet temperatures helps but remember the air flow under bonnet is intended to come in over the hot radiator, pass over the top of the engine and down the transmission tunnel. If you interrupt the designed flow path you will probably cause an increase in heat. Eg. removing the blanking plates under the louvres.
I am not aware of any commercially available top mounts that can match front mounts for reducing charge temperatures.
I am not aware of any commercially available top mounts that can match front mounts for reducing charge temperatures.
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