Throttle Body Bypass

[me&mygt]

Has anyone done this? I have read that you can bypass the coolant lines through the throttle body to reduce the heat transfer and thus lower the air intake temp. Has anybody attempted this and does anyone have a diagram of which hoses to remove and bypass etc?

[Dan_Q]

i have heard of this actually........ not something I've actually thought of doing yet.

I think there is some information on this mod on www.celicatech.com in the NA tuning section, but I dont think they got your engine over there. Would imagine it would be the same on any car with that function though.

[dawesy]

yep well worth doing although tends to be the tubbie brigade doing it.

if you look at the throttle body you should see two pipes that connect to the cooling system (youll know youve got the right ones if coolant comes out :) )

just disconect and join the ends together (eliminating flow around the throttle body)

the gains wont be huge and the car may act a bit odd when the air is very cold until the engine has warmed up, but this wont be anything major

[me&mygt]

Did this today. removed the two pipes from the throttle body. They are easy to find. Completely removed the exit hose then detatched the inlet hose using that as to do the bypass. The job takes about 10mins. Before i did it i drove the car until it was at running temperature and checked the throttle body heat absorbtion. Yep, it was hot. After the bypass i did the same and the throttle body remained cool. It's an easy mod and although i didn't think that i felt any noticable gains to write home about, it's got to be better in some way i'm sure. Perhaps a longer drive may show some difference.

[Black Knight]

The hoses are there purely to heat the throttle body. The reason is to prevent icing in cold weather. What'll happen is if you take the car on a long drive in cold weather now you'll probably find the throttle very notchy.

Example, if you're cruising along at 60mph and need to accelerate to 70mph the throttle will open very suddenly; or if you lift off suddenly the car will still try and pull since the throttle's being held open by ice.

So long as that's acceptable to you then it won't do any harm to the engine

[dawesy]

to be fair with our current climate in this country it wont be a problem