Heated Throttle Body: Anyone close the heated lines?

[fun2drive]

Am I the only one that things for spring, summer and fall, actually year round here in Florida, that the heated throttle body is not useful?

I have thought about a 1/4 turn shut off valve on both hoses into and out out the throttle body for year round driving here. I think it will help reduce heat since the coolant is what 180 degrees or so and acts like a heat sink.

I can see the use when it is cool or getting cold out to keep from icing up but other then that condition I see no point to it.

Educate me if this assumption is incorrect. I have an aftercooler with my supercharger and then I add heat back with this thing seems illogical.

[JordanMD88]

I have I just routed the in hose to the hard line that the out hose connects to On both my E36s'

[fun2drive]

So I am not the only one that sees this as usless for the climate I live in. I think I will put 1/4 turn shut off valves on both input and output so that it keeps the car functional if driven someplace cold but I think I am adding a lot of heat back into the car by this necessary heat sink for cold winter conditions but not hear.
Thanks

[marc1119]

I have removed the lines from the t-body on every car I have Supercharged..
It seems like a waste to me, unless you drive your car in the winter...
And I have yet to work on an FI'ed car that gets driven in the winter...:)

[pbonsalb]

I did it and I live in New Hampshire. I have been warned that my throttle plate will freeze up, that it will stick open, and that I will suffer an uncontrolled high speed accident as a result. However, I have owned and driven other cars without heated throttle bodies in New England winters and suffered no such problems.

Philip Bradley

[turbosporttsi]

i thought i read somewhere that it only allows coolant to flow to the tb at certain temp? or something?

with that being said..... i rerouted mine as well.... :)

[pbonsalb]

Yes. There is supposedly a thermostat. Usually thermos have a bypass, so some coolant always passes, but I have not tested by opening the hose in the summer. I suspect the thermo may open for cold starts even in non winter conditions. This could be as much a cold start emissions thing as an ice build up thing, but I am only speculating as to that.

Philip Bradley

[marc1119]

I believe the pre96's used the thermostat...in the airbox...
Have seen a few break and leak..and overheat the car....

I believe the 96 and newer is "an all the time" setup...

The main feed and return are on the engine block, but I have not seen anything there to make me think there is a way to control it...If there is..I do not know how it works and where it would be, because I do not think it is there..:)

[markesq]

Never even thought of that. Looks like I might add this to my project tomorrow.

[GGray]

I pulled mine off cut the hose and plugged it. Used the spot on the head where the hose attach's to put a water temp sending unit. Gee just happens to be the same as a VDO temp sensor ;) Then I took the throttle body and cut the feed and return tubes off and sealed them with JB weld..Just to keep them nice and closed...cleaned a ton of crap up from the bottom of the manifold.

I live in the deep south so its totally not needed down here.

[marc1119]

I use to 2 vacuum caps over the t-body nipples..you really do not have to put anything over the naked nipples after you remove the hoses from the t-body...


On the engine block end...
I remove one rubber line from its hard line, and cut the other rubber line to go over where I removed the first...and clamp it..creating a bypass loop right outside the engine block....

[Matt]

I believe the 96 and newer is "an all the time" setup...

You are correct.

There is a thermostat on OBD1 cars. On the M50 that's going in my car, I did away with the thermostat but left the coolant flowing through the TB all the time. I don't really see a downside to it.

[pbonsalb]

I am sure someone with some expertise in physics could help us out here. I suspect that passing 400 cfm of air that is already at 100 degrees F through a 2.5 inch diameter 3 inch wide ring heated to 225 degrees F will raise the temperature of that 400 cfm of air from 100 degrees F to maybe 105 degrees F, but I'll defer to someone who did better in science than me. I tend to follow the "every little bit helps" approach.

Philip Bradley

[fun2drive]

Markesq:
Yep before you put that aftercooler in there you could take care of the lines. I wish I had done so before I put mine in again. Every little bit helps to cool that charge down...

[markesq]

Will do. Probably just going to make it a loop

[Lohe]

I looped mine and have never had a problem driving it in the cold winter time.

[ICS Performance]

I also remove the 2 hoses and extend the hoses and use them for coolant lines for the watercooled turbos. (Ball bearing units that require cooling)

[Eric BMW]

This topic makes me think StL for the lose.

[RRdawho?]

Eh I rerouted it to the waterlines on my turbo.

[SlowSE36]

BMW is not the only car that has coolant going through t-body. Check any VR6 car and you will see that most of them have it rerouted and have not a single problem in cold or hot weather.

[Racegun]

I just bought a 93 325i it looks as though it has an aftermarket intake, but its not mounted very well. When I pulled the filter of I broke one of the plastic fittings of on this thermostat, so I connected the two lines together as I am trying to diagnose other problems. The thing is the car doesn’t seem to idle as well now, should I do something different to those lines or should I find a new thermostat? I have tried all the local parts store they all say find a dealer.

[olsen185]

I just bought a 93 325i it looks as though it has an aftermarket intake, but its not mounted very well. When I pulled the filter of I broke one of the plastic fittings of on this thermostat, so I connected the two lines together as I am trying to diagnose other problems. The thing is the car doesn’t seem to idle as well now, should I do something different to those lines or should I find a new thermostat? I have tried all the local parts store they all say find a dealer.

:shifty WTF?

This is a 2 year old thread about closing off heated throttle body ports in the forced induction forum. What would make you bump an old thread for an unrelated problem?

Anyway it sounds as if you need a new throttle body boot. If your post hfm boot is torn your car is seeing un-metered air causing the rough idle. This is just a guess since you are talking about intakes and thermostats, I can't make much sense out of it.

Maybe you should make a new thread in the e36 section regarding your problem with multiple pics showing the damage. I'm sure it can be figured out rather quickly.

[busterhax]

hrm so that is what those 2 hoses under the TB are. it gets down to like 5º here i think ill take the extra heat