Throttle body coolant bypass [Merged 9-7]

[TwoLiterV8Eater]

I just disconected the coolant hoses and didnt have any idle problems or anything like that. However my car is a flaming pile of shit and has only run for about 4 weeks out of the entire year.

 

[DSMJim]

Right, however your in a pretty warm area. Here in good Ol Canada, it gets cold close to the end of the year and I put my car away and don't drive it. But for a few months I do and I don't wanna run into problems.

Anybody in the northern US or Canada have anything to add?

 

[jdmawd]

Originally posted by TwoLiterV8Eater
However my car is a flaming pile of shit and has only run for about 4 weeks out of the entire year.

:laugh:

 

[TwoLiterV8Eater]

Jim: If its any consolation, the last time my car was running (very recently) it was about 35-40 degrees outside, and it didnt have any problems. It seemed to idle a little higher (50-100 rpms), but no surging or anything like that.

JDM AWD: I think your car runs about as much as mine does

 

[DSMJim]

Well after all that, I decided that I would just take it all appart again and hook it back up. I figured it was not worth the hassle and that the manifold gets so friggin hot under the hood that the coolant couldn't possibly make things hotter than they are anyway.

I started the car up and it idled at 1500 then droped to 900 then down to 750 after about 2-3 mins of driving. I prefer it working properly to having to keep my foot on the gas when starting etc.. RRE's site on the 1G throttle body on a 2G helped me a lot and the TPS adjustment procedure they gave was bang on. I didn't have to port the manifold however as its a magnus unit. Props to RRE for their tech section, has helped me a couple of times now.

 

[TwoLiterV8Eater]

Ah...good to hear. I was going to ask why you disconnected it anyways. Everything is a PITA on the 2g I only disconnected mine because everything was apart and I figured "why not". If I ever have any problems I will just hook it back up.

 

[jdmawd]

Originally posted by TwoLiterV8Eater

JDM AWD: I think your car runs about as much as mine does

my car always runs unless im waiting on parts to complete mods.

 

[DSMJim]

Originally posted by TwoLiterV8Eater
Ah...good to hear. I was going to ask why you disconnected it anyways. Everything is a PITA on the 2g I only disconnected mine because everything was apart and I figured "why not". If I ever have any problems I will just hook it back up.

I was going to disconnect it because I switched my intake manifold and went to a 1G throttle body. Because the Magnus intake manifold moves the throttlebody so far I had to use two new lines for coolant which were a PITA to change. I was just going to leave it and not bother, but I decided it was better off to do the work then to put up with the problems if there were any.

 

[joeym4130]

I just got a Tsi, and i see the coolant lines that are supposed to go into the TB are not attatched, im assuming they were disconnected and rerouted into the system. What effects would this have?? I think those are for the FIAV? Cause i have a idle problem and today was decently warm outside and she idled a lot better, almost normal. could it be that the FIAV is not blocked off, but just had the coolant lines removed? I would assume that would keep the FIAV open until it gets hot enough under the hood to melt the wax pellet and bring the idle to normal so on a day like today when it was finally warm out, the car could idle. Blocking the FIAV with a plate would fix this completely no? Thanks for any help!

 

[noz]

this suppose to be one of those free mods
theres a lot of people who reroutes the coolant from the throttle body back to the system so that it will be a lot cooler.........i hvan't personally tried this and not sure if it works......but people who have dont' really have problems with it as long as it ain't that cold out there.

 

[dave99gst]

it helps during COLD starts. somtimes there are idle probs when ya do this mod.. if your car idles fine and starts no prob. dont give it another thought.

 

[clownface]

i did that mod and im having a slight idle lumpyness on occassion, i cant say if its related or not yet but the mod sure was easy enough and easy enough to take it back if i wanted.

 

[joeym4130]

so u think i should find a way to run coolant back thru the TB?? I didnt know blocking it creates idle problems....I dont see anything to hook up, i got the car this way. I was only thinking about it since the car idles high constantly. Should i just splice into an existing line to reattatch?? thanks.

 

[clownface]

just take the intake line and put it into the return line. Unless you want to run it back in the TB.

 

[killab443]

I was wondering if I could get away with not hooking all the hoses for coolant up to the throttle body.

 

[bastarddsm]

is there a particular reason you want to do this? like thinking it will keep the charge air temp down. i would personally keep it as it will act as a intercooler.

 

[NitrousBob]

I have had mine off for like 3 months and 4k miles.. its all good.. I also took off the egr and the little motor off the throttle body.

 

[DSMeclipse4G63]

is there a particular reason you want to do this? like thinking it will keep the charge air temp down. i would personally keep it as it will act as a intercooler.

200+degree coolant does NOT act as a cooler for air. the coolant of a good cooling system on a dsm stock is around low 200degrees, so yes it will help just dont expect tons of power. The only place it is worth having is alaska in the winter, or somewhere up north.

What I did is take one hose completly off and reroute the other longer hose back to where the other hose you removed comes from. So its just a loop like it was in the throttle bodie but just going through a hose. All in all I would recomend doing this especially on the stock sidemount, casue they dont cool enough as is, let alone heating it more when going to the tb.
Andrew

 

[bastarddsm]

The coolant will act as a cooler especially on something with the 14b and the sidemount. When you start turning up the boost especially on a hot day the charge air temp is well above 200 degrees. The intake air is in the high 100's before it even goes into the turbo.

Secondly, what do ya suposed the temps inside the intake are. Do you think that magically the intake doesn't transfer heat from the motor?

 

[1fast97gsx]

The coolant will act as a cooler especially on something with the 14b and the sidemount. When you start turning up the boost especially on a hot day the charge air temp is well above 200 degrees.

Um no... how hot do you think your coolant is when your car is at full running temperature? And no .. your throttle body isn't 200 + degrees on a hot day. The reason that coolant flows through the throttle body is to help with startup in the winter and keep the throttle plate from freezing. If you take those out car idle will kind of jump around ... especially in the winter time. And you WON'T gain ANY performance from this mod. 1hp at the most.

 

[gixxer]

bastard dsm..you are wrong, your idea of hot coolant pulling heat out of the intake charge is ludicrus.

the only reason coolant goes through the TB is to melt the wax pellet in the FIAV to raise the idle in cold weather situations

it also serves to warm the TB to keep the throttle plate from icing open.

if you want to ditch the FIAV and the ISC, you must have 91+ TB. pull off the lower half of the throttle body and make a plate to cover the holes. this will get rid of most idle surge problems. if you have A/C and like what your ISC does, don't do it

 

[NewB2dsm]

I have thought about doing this for sometime, Giving the reason that coolent going through the TB is very warm. And with a cool intake charge like i should have all it is doing is heating the air up slightly along with the pipe around the TB. Just dont know if its worth the mineute gain.

 

[1fast97gsx]

I have thought about doing this for sometime, Giving the reason that coolent going through the TB is very warm. And with a cool intake charge like i should have all it is doing is heating the air up slightly along with the pipe around the TB. Just dont know if its worth the mineute gain.

exactly .. either way it will NOT cool the air if you have the lines connected .. it will be cooler with them not connected. The gains won't be noticeable and your idle will bounce around during warm up. My main concern would be in the winter.

 

[Kevin Jewer]

I Dont think it has anything to do with the temperature of anything. The heat from that coolant is getting up to the throttle plate has to be very small. As mentioned before, its all about raising idle speed. As it heats up, it gradually lowers rpm. Nice closed loop fast idle system. I havent used it in some time now, no ISC either. The choke function raises the idle a little anyway until it warms up so you still get some of the effect. I did it just to reduce the number of coolant lines available to blow up in the middle of nowhere. For a regular car I Would recomend keeping all that stuff, fewer hassles with idle and driveability. If you want to try it, do it in such a way that you can go back to stock if you would like to. No harm in trying, just dont make it permanent

 

[DSMeclipse4G63]

Like I said I did it and yes it helps but no it doesnt add hp. Since Im on the stock sidmount and running a low boost b16g it helps in insurance for my motor. About idle problems I have none, my 1g tb works great with the coolant disconected.
Andrew