Throttle body bypass kit

[Uj2]

Coolant through/around the TB??? I'm not the seller (nor the buyer), just though it kinda strange.



ebay auction (http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1851374835)

[aaronsdropzone]

I remember reading about how a little bit of coolant is ducted through for cold-weather starts, so I could see the benefit in bypassing it if you don't live in a cold area.

[Jim O.]

That's totally ridiculous - 12 bucks? All you have to do is remove the two hoses that connect to your throttle body and jump them together. I removed one of the two hoses totally, and ran the other hose to where the removed hose was connected. Total cost? Nothing except for 3 minutes of my time...

Jim

[Alpine95]

Jim, are there any negative effects from it? I've always thought those hoses were useless for this climate. I'm assuming the same goes for OBDI and OBDII.

Thanks.

[Jim O.]

Honestly, I don't remember if the heat thing is there for cold weather, or for emissions purposes. Can't be for cold starts - the coolant would be cold, so circulating cold coolant around a cold throttle body wouldn't do any good. Anyway, I can't think of any good reason not to make the mod. Doesn't really give you very much, though...

Jim

[Alpine95]

That makes more sense now that I think about it. Must be for emmisions or some other purpose.

[UD///M]

What do you bet that kit is nothing more than two hose clamps and a section of hose. $12 my eye. :confused:

[Kevlar]

here is some explanation...

the coolant hoses are there for a reason. In colder climates at higher RPM, the air is moving so fast and is so cold it actually can form ice particles that would go into the engine. the warm coolant helps alleviate the problem.

now you say what about when the car/coolant is cold. remember that part of the user's manual that says dont drive the car hard until its warmed up? thats one of the reasons...

now you may say "but kevin, it's 110 degrees outside!" its alright. On some cars (not sure if this includes BMW ... the coolant is temp controlled, so if the temp is above a certain degree, it wont flow across the TB)

at least, thats how it was explained to me.

[bimmer95]

The '95 M3's, at the very least, have a thermostatic valve in the airbox that only allows coolant to flow to the throttle body if the temp in the airbox is below a certain temperature.

[jmciver]

My mechanic told me it is pretty useless, even in colder climates here in the states. If I lived in a colder climate I would probably keep it but I have been meaning to get rid of mine.

Besides, the thing probably doesn't work for all us guys with CAIs since the sensor probably never gets cold enough to allow coolant flow to the TB.

So does anyone know the temp at which the sensor allows coolant flow to the TB