Throttle Body Coolant Bypass Mod
#1
Throttle Body Coolant Bypass Mod
Throttle Body (TB) Coolant Bypass Mod
Granted this is a very common mod to do, but there is a small warning to take note of. If you live in an area where the weather tends to get cold, say around 20 - 15 deg F or lower, keep all the original tubing, since you will want this come winter time to keep your TB butterflies from sticking. Short science lesson, heat causes metal to expand, cold causes metal to shrink. Different metals shrink and contract at different temps. The TB coolant lines warm up the TB and make sure that the butterflies dont stick due to size differences.
On to the mod.
Expected Gains: I cant remember where some rich kid paid some people to do the math and then dyno proved it, but the average gain in Horse Power (HP) is around 2 - 3 HP. Sure, some people have claimed around 4 - 5 HP even. The facts are that this mod will cost you around $2 for the hose unless your auto parts store has free scraps.
Benefits: colder air = denser air = HP
I recommend doing this mod if you are installing a Cold Air Intake (CAI) or Short Ram Air Intake (SRI). Might as well since you will have most everything out of the way anyway, right?
You might want to remove any breather lines out of the way and unhook any wiring harnesses that might prove troublesome to reaching the coolant hookups/nozzles. Just remember where everything goes and what goes where. Nothing worse than thinking a mod screwed up your car cause your too bone headed to hook everything back correctly.
Here is what the engine bay will look like on a 2.5 TL (granted this mod I have done on a Maxima, Accord, Geo Metro, Toyota Camry, Legend, and now the TL. it will work similarly on any car. Just follow the coolant flow)
You have 4 access points that you will be dealing with. Coolant Out of main, Coolant in to TB, Coolant out of TB, Coolant Back In to main.
Here are Close Ups of the access points
To bypass the TB coolant you are basically connecting the Coolant Out of main access point and routing your hose straight to the Coolant Back In to Main access point.
Its that easy.
Here is what my bypassed setup looks like (hose highlighted in red to show its path)
If you have any question, feel free to PM me.
Granted this is a very common mod to do, but there is a small warning to take note of. If you live in an area where the weather tends to get cold, say around 20 - 15 deg F or lower, keep all the original tubing, since you will want this come winter time to keep your TB butterflies from sticking. Short science lesson, heat causes metal to expand, cold causes metal to shrink. Different metals shrink and contract at different temps. The TB coolant lines warm up the TB and make sure that the butterflies dont stick due to size differences.
On to the mod.
Expected Gains: I cant remember where some rich kid paid some people to do the math and then dyno proved it, but the average gain in Horse Power (HP) is around 2 - 3 HP. Sure, some people have claimed around 4 - 5 HP even. The facts are that this mod will cost you around $2 for the hose unless your auto parts store has free scraps.
Benefits: colder air = denser air = HP
I recommend doing this mod if you are installing a Cold Air Intake (CAI) or Short Ram Air Intake (SRI). Might as well since you will have most everything out of the way anyway, right?
You might want to remove any breather lines out of the way and unhook any wiring harnesses that might prove troublesome to reaching the coolant hookups/nozzles. Just remember where everything goes and what goes where. Nothing worse than thinking a mod screwed up your car cause your too bone headed to hook everything back correctly.
Here is what the engine bay will look like on a 2.5 TL (granted this mod I have done on a Maxima, Accord, Geo Metro, Toyota Camry, Legend, and now the TL. it will work similarly on any car. Just follow the coolant flow)
You have 4 access points that you will be dealing with. Coolant Out of main, Coolant in to TB, Coolant out of TB, Coolant Back In to main.
Here are Close Ups of the access points
To bypass the TB coolant you are basically connecting the Coolant Out of main access point and routing your hose straight to the Coolant Back In to Main access point.
Its that easy.
Here is what my bypassed setup looks like (hose highlighted in red to show its path)
If you have any question, feel free to PM me.
#7
Get an inline shutoff valve if you need to turn the water back on during winter. It's as simple as turning a valve.
The hot water is there to keep ice from forming and sticking the TB, not due to the different expansion rates of the butterfly and TB housing. Every manufacturer uses hot water today. Even my 84 GN had hot water going to the TB.
It typically has to be well below freezing for ice to become a problem. Ice was more of a problem in older carburated cars due to the venturi cooling effect and fuel evaporation.
The hot water is there to keep ice from forming and sticking the TB, not due to the different expansion rates of the butterfly and TB housing. Every manufacturer uses hot water today. Even my 84 GN had hot water going to the TB.
It typically has to be well below freezing for ice to become a problem. Ice was more of a problem in older carburated cars due to the venturi cooling effect and fuel evaporation.
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#9
Originally Posted by haynTL
ok i think i did the bypass correct but can someone show me a pic of how it looked finished for the 3.2?
#13
here is my set up on an 2006 TL TB coolant
#15
Honestly, the difference is negligible. Some cars could get a dyno-proven 6-7 wheel from it, but we wouldn't see anything like that. One upside though, is that it helps stave off heatsoak a little bit, so it you've been driving kinda hard in warm weather, you won't feel the car slowing as much thanks to the throttle body no longer being heated by the coolant.
Two and a half years late, but I Hate Cars is right. If you live in an area where it snows or gets below freezing often an inline valve would be the way to go.
~Cheers~
Two and a half years late, but I Hate Cars is right. If you live in an area where it snows or gets below freezing often an inline valve would be the way to go.
~Cheers~
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