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Simple Coolant line bypass step by step guide(detailed)


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This would be a very usefull thread for those who belongs from hot weather countries like me.



Reason for giving coolant line to throttle(from toyota):- its given so that the butterfly valve dont get freezed and also warm up the air little bit that the engine is sucking in very cold weather or freezing temperature in some countries..



but in hot weather countries it can be a problem.i was facing idle problem.it raises the intake temperature badly and also it makes the air very hot that the engine is sucking.which reduces o2 level in the air and thus leading to idle problems.when my engine gets into a optimum hot temp i lose power comparing to when the engine is cold.



by doing this you will gain power reducing the intake temp.it can be a big advantage if you have cold air intake.



How it works:- lets name the connecting points as A B C D. A is the point from where the coolant comes to intake poi nt B. t hen from B it flows through the throttle and comes to point C which is also a point in the intake.From C it then returns back to the engine point D.All the points are connected by pipes.



Points: A-Coolant supply point.


B-Coolant entering point at throttle


C-Coolant exit point from throttle


D-Coolant return point at the engine



How to do it:-



1)Open the B and D point pipes from the intake and engine.



2)Replace the pipe's positions.from B point, the pipe goes to D point and from D point, the pipe goes to B po int.



Now you have a ''U'' shaped pipe connecting your B and C point at the intake.


and the pipe from point A directly goes to point D which is both engine points.



now no coolant is flowing through your intake.its is now directly flowing from supply point to return point.


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ask me if you have any ques regarding this thanx. hope it would help.


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This looks like a brilliant mod. Would this be worth doing for uk based cars? I don't think it gets to freezing temps too often here. Some people may beg to differ. Anybody got any opinions on this?


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This looks like a brilliant mod. Would this be worth doing for uk based cars? I don't think it gets to freezing temps too often here. Some people may beg to differ. Anybody got any opinions on this?

dont do it unless you want proper idle afer ages only !!!!

i run no iacv and her components ( just acis and 2 vac lines with enclosed tb ) and just a plate under the tb no water or vac lines non off that crap and in winter time it takes up to 10km to warm up the tb propper so she wont stall at idle !!!!

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dont do it unless you want proper idle afer ages only !!!!

i run no iacv and her components ( just acis and 2 vac lines with enclosed tb ) and just a plate under the tb no water or vac lines non off that crap and in winter time it takes up to 10km to warm up the tb propper so she wont stall at idle !!!!

I have looped the cooland but still have the iacv fitted and connected.. It's partially operated by the ecu so that's why yours won't idle.. Mine idles high for longer but doesn't have a problem doing so..

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dont do it unless you want proper idle afer ages only !!!!

i run no iacv and her components ( just acis and 2 vac lines with enclosed tb ) and just a plate under the tb no water or vac lines non off that crap and in winter time it takes up to 10km to warm up the tb propper so she wont stall at idle !!!!

The above post makes little sense to me... :unknw:

I have done the mod on an N/A which is slightly different to the pictures above. I think it has made a slight difference. Deffo worth doing. Every little helps when you have no boost.

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dont do it unless you want proper idle afer ages only !!!! < This makes no sense...

i run no iacv < A what? and her components < Neither does this ( just acis < What? and 2 vac lines with enclosed tb ) and just a plate under the tb no water or vac lines < Whats the plate under the throttle body for? non off that crap and in winter time it takes up to 10km to warm up the tb propper so she wont stall at idle !!!!

Still cant make much sense of it...

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  • 6 months later...

I did this, one of my first mods when I got the P9. No big deal in Australia for the freezing issue, but I also did it on my 2010 Kia when I was in eastern Canada. Never any issue in winter with temp down to -35°C.

This with an inlet thermal spacer is great, even better with a CAI. I would say the most important part to cool the temperature is the spacer, followed by the bypass. the CAI is more for air flow (and sound) than temperature.

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  • 8 months later...

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