I don't think anyone has dynoed before/after, but I do know that guys w/ LT1's and LS1's have done this and dynoed w/ gains around 6hp or so. It is a free mod that can easily be reversed which is why I feel most people do it. If anything it keeps the incoming charge air a little cooler which can't hurt any.

 

the gains could be similar because we have forced induction and the camaro's are N/A...well...most of them.

 

The gains from this mod will probably give you about 0.01 sec. Once heat soak traveles to that side of the engine there will be no gains.

I did this mod because I couldnt stand the idea of hot fluid flowing through the assembly after air has gone through so much just to get colder.

 

Just to be clear, this is NOT an emissions item, it is an anti-icing system. As far as adding horsepower: Having coolant flowing through the throttle body actually causes the whole intake manifold to heat up somewhat. This will heat the air a little bit, which decreases air density. I would not think it would make much difference, maybe a few HP, but it is a free MOD afterall so why not have a few free horsepower.
Also, if you completely block off those coolant lines, it slightly increases the efficiency of the water pump. More coolant volume for cooling the head and block...

 

If you think that the coolant at about 185 degrees is actually going to affect the intake manifold as far as getting it hotter you are wrong. The intake manifold gets way hotter than 185 degrees, this from being bolted to a head that is bolted to a super hot turbo manifold. So if you guys suspect that coolant running through the TB will actually heat it up you are mistaking. The reason race cars eliminate this is purely due to having one less leak to possibly worry about, or because their bigger TB doesnt use coolant passages.

 

The only reason I could see this helping is for the first 10min of driving where eveything isn't heated up already. I would suspect once everything is nice and hot this mod will not really do much since the TB is already just as hot if not hotter than your coolant.

 

So it this myth BUSTED??

 

I have it done on my car.

It's not one of those things where you go, WOWHOLYCRAPMYCARISSOFASTIWANNAPUNCHMYMOMINTHEFACE! !!!

But it's one of those little things that helps.

 

Another thing, antifreeze loweres the heat conductivity of water thereby decreasing its efficiency. Dont decrease your %/volume if you live where its cold just use the % you need to keep from freezing. Good for another 1-1.5 whp

 

Guys when I tested this before and after it make a bigger difference in temps than you would think. Before I had it bypassed I could pull in and put my had on the throttle body and intake manifold and it would be very hot to touch. With it unhooked it was noticibly cooler. Its free and anything to keep the air charge cool has benifits so why knock it. You might give it a try and see the results yourself. Keeping the hot coolant out of the throttle body does keep it cooler. Pretty easy to understand.

 

I'm not sure about the evo but on hondas the coolant that runs through the throttle body is for increasing the idle speed under cold conditions. There is a thermowax valve that closes once the coolant reaches a certain temperature, slowing the idle back down to normal once the car warms up.

 

This is the same effect on the mitsubishi FIAV valves.

 

I went poking around today... I found the coolant line to the block but did not see the other? Is it behind the TB? under all that ****?

 

Just to add a little bit more to the enormous amount of info here, below is a link that might help understand this a bit more. This mod as someone else posted here has been done one DSMs for a LONG time, with no ill effects. Look for the part where is stats "1G FIAV PLUGGING". These guys actually block it off, so its a one time deal, but then again we are talking about free mods here!!!

Just another alternative to do it the right way and do it once, well except if you decide you want to connect them again you are screwed!!

Also, remember this is for the 1989-1999 DSMs, I will look at the evo shop manual to see if its the same and post back.

http://www.ffwdconnection.com/flow.shtml

 

Thats funny, I was just working on something for you guys so you can have a better idea. The coolant lines are identified with blue text and in a squared area. I also pointed out the where the intake manifold is positioned. Hope this helps out.