ronin_of_life

Just wondering if any of you tried the throttle body coolant bypass mod on your G2 integras.

http://www.acura-legend.com/vbulleti...54/#post354491

This is the mod for a Legend.

Its supposed to keep the throttle body temps low by rerouting the hot coolant away from the TB. The coolant however, passes through the IAC, thus supposedly eliminating fluctuating idle that would otherwise occur when conducting this mod.

This mod is said to increase the efficacy of a cold air intake, and even without one, there would be an increase of 1-2bHp, and for the time it takes to conduct the mod, and the ability to reverse it in case anything happens, I don't think its a bad idea.

So... would this work on a G2 integra? Are the hoses in similar positions in the Integra as it is in the Legend? What are your thoughts on this mod?

PS: One must consider why hot coolant is routed to the Throttle body- to prevent the butterfly valves from freezing up during the cold. Obviously I will switch over to the normal configuration once winter comes along (I"ll also have to replace the CAI with the stock intake as well to prevent corrosion of the filter, but that's besides the point...)

PPS: When conducting this mod, there will be a noted loss of coolant. Would this result in air bubbles within the system (especially when putting everything back on?)- how does one bleed the radiator system? Is it worth the effort?

XNXIXTXRXOX

Yes it will work on your second gen.

No you will not lose much coolant at all, just a very tiny bit. Nothing to worry about.

IMO I think its useless and silly. But if you really want to, theres nothing wrong with doing so. Just put it back to normal in the winter.

MPR

Not worth doing.

You won't notice any gain. It's pointless.

If you want to keep the whole intake mani cooler, install a thermal intake mani gasket. they are only $30 or so.

ronin_of_life

hmm, but how would that hold up during the winter, when I WANT the intake mani to be warm?

well, I decided that its not worth messing around with the idle and what not for minimal gains in HP...
(call it sour grapes though- I don't even know where the proper hoses are for the teg...)

MPR

^The intake mani will still get warm. Just not as warm.

The intake thermal gasket will do a much better job at keeping the intake air cooler than just having the coolant by-pass the tb, is all I was saying.

Why do you want the intake mani to be warm? The engine itself needs to be 'up to temp'. The intake mani temp has no effect on that other than helping to reduce the intake air temp.

ronin_of_life

well, I have a cold air intake, and with that I withdraw cold air into the engine. Colder air has a higher oxygen density than warmer air. The intake mani however, warms up the air entering the combustion chamber, thus lowering oxygen density...

Or that's what I believed until I thought about it yesterday...

The amount of oxygen you're gonna get is coming straight from the CAI- now, assuming that the throttle body + engine + exhaust system is a closed system, air and oxygen will NOT escape through the throttle body, thus, the oxygen density will NOT lower, just because the throttle body is too hot.

Cooling the throttle body however, will lower temperature of the air, thus lowering the speed of the molecules (they are much more dense when cool). More dispersed and excited oxygen molecules will collide faster with the fuel particles, initiating combustion at a faster and more efficient rate.

Thus, assuming that the intake, TB, engine, and exhaust system is a closed system (so that oxygen density will not lower once air enters the system), DECREASING TB temperature should NOT make the vehicle more efficient.

So... why are people (ie. the Legend and Camaro crew) reporting an increase in HP and mpg when cooling the TB? I must be missing something here... (ie. the system is not closed, and oxygen density can fluctuate even when inside the engine/TB)

D.T.P

iTrader: (3)

But dont forget that the intake pipe WILL get hot since its a thin pipe causing air to expand and not flow as much. As suggested above intake thermal gasket would benefit. Also the thing with intakes, you can purchase an expensive intake and a cheapo intake and will all be the same then if you do enough research you can modify a regular intake for different length and the filter/velocity stack to flow a bit better. It is possible to gain more power by properly sizing the pipe, but the time it will take is just not worth the 1-2hp.

By the way, its been tested and short ram intake will work better than CAI, to top it all off, SRI will be safer during rainy days.

ronin_of_life

I got the AEM CAI pipe as a gift- I just had to buy the filter for 50$... I tried selling it here but no luck, so I just installed it...

I would've preferred the short ram- I wouldn't have to switch over to the stock intake during the winter (otherwise it would kill the filter)...

now... as for the intake thermal gasket- is it easy to install? DIY stuff?

MPR

^It's pretty straight forward.