well winter is here in Portland OR and the temp is hanging out around 35 - 40 degrees F in the day and under 32 at night. My question is should I reverse JTso's TB bypass for the winter or not worry all that much about it? I park in my garage at night which never falls below 50 degrees F. But during the day I park in a parking garage that is exposed to the outdoors for 8 hours.

Any opinions on this??

 

I don't think you would feel a significant difference with the TB bypass so why not just be safe and reverse it.

 

I think you should just give me your Comptech Exhaust and call it a day


JK LOL

I think its going to get colder here in the Pacific Northwest. You could undo the bypass.

 

i would say that it doesnt really hurt because after all....every morning everyones car starts at the same temp with or without the bypass its the same after sitting out all night.

 

True, but as soon as the car starts you're drawing cold, moist air through the throttle body. I'd imagine there's a good chance the throttle plate could freeze, without a heat source to counteract. I sincerely doubt there's much to gain from redirecting coolant flow away from the T/B even in the best of circumstances, and a lot to lose if the throttle plate gets stuck part way open.

 

The actual chances of the butterfly on the throttle body getting stuck open is slim to none. 95% of cars do not get any coolant to the throttle body at all and work just fine without it. I think if you are worried then switch it back, it might just be worth the peace of mind on your part.

 

Really? 95%? Pretty much every Honda I can think of from at least the last 10 years routes coolant thru the T/B.

 

I'm in Toronto, temps right now is avg -5c to -10c + windshield... done the by-pass mod and no problem yet. Will update later when it drops to -30c.

 

i see your point but when you start up your car every morning its getting the same moist air. the engine takes time to heat up the TB. Also the spring on the TB is more than enough to stop it from freezing while part way open.

 

Point is even on cold start the coolant inside the engine is insulated from the outside temp, not to mention it has a lower freeze point than plain water. Even though is not "warm" from absorbing engine heat it's still should reduce ice forming in the intake tract. My assumption is that Honda's engineers would not circulate coolant through the T/B if there wasn't some chance of freeze up without it.

We've got one poster (chuson) who hasn't had an issue in fairly cold weather so if that's good enough for those with this mod. then so be it.

The return spring and/or the actuator for the throttle plate MAY be strong enough to overcome ice in the throttle bore, but you don't know for sure that it will, just like I don't know for sure that it won't.

My question is... does anyone actually have dyno data with and without this mod that shows it provides any power or fuel econ. benefit?

Without that I'd say it's unnecessary risk esp. in cold climates.

 

theres no dyno but there is the p2r TB spacers that acts the same as this mod with dyno gains of 4.5whp/tourque on a 06 civic si. While gains of 8whp/11ft lbs on and TL. So there are substantial gains.

 

have you or do you plan to reverse the bypass mod for the winter?

after reading up on this, i feel like it's unlikely that we'll have problems with it in our climate even in the cold winter months. afterall, jtso is in WA, and hasn't had problems.

p.s. is this something you could help me with too, while we do my RSB? i'm not sure exactly which parts i need, so maybe we could take a trip to home depot if you're willing

p.p.s. i've got my UR pulleys on order from speed concept. i hope it'll be at the end of the week. if not i'll have to wait until after the holiday to have it installed.

 

I've run my TB coolant bypass for 3 years now in some winters that were very wet and cold. Trust me, NO issues at all.

 

nevermind. i did this today while i was at work with no additional parts, though i did need to get a couple vice grips to complete the process. i still ended up dumping a bunch of coolant out, but i think that's inevitable, since there's some always in the lines.

i just hope i got the right tubes!

my car drove home alright though

 

+1, there are many Canadian members (including myself) that have done this mod without any troubles. I'm pretty sure we get it colder than you guys in the lower states.

 

psh couldn't wait could ya! I should have time sometime this weekend for your RSB install. Takes about an hour. Now that you have done the TB bypass, you should let me rewire your fogs sometime for ya too =P. I have left the bypass together and haven't had an issue yet, was just curious what the opinion was of other users running the bypass. Thank you all for you opinions and experience it has given me some extra confidence. Hopefully other users have found the this thread helpful as well

 

heh. i may still be in for the foglight rewire at some point. it'd give me some DRLs anyway...

it would be great if we could get my RSB in this weekend sometime. much appreciated

 

I had my collant TB bypass mod for over 1/2 year now, and the weather here in State College, PA is in the 20s now, drive to school everyday and no problem at all. Also remember that the intake manifold also have coolant routed there, and that whole chuck of Alumium will heat up, and it will slightly warm/heat up your TB too. No worry for it.

 

I was considering making one soon with a valve that I can use, so if it's freezing I can just switch it so coolant goes to the tb, or close it so none goes there when it's warm out. However, if nobody has problems with the bypass in cold weather, I might as well forget the valve and just do it normally.

 

that's a pretty great idea though, for people in super-wintery areas or for people that are more cautious.

 

 

I guess I'll just do it that way then and do a writeup for yall wintery folks.
I'll do it after Christmas and give a heads up in this thread.

 

You'll have to figure out a way to close off the return side as well because I think you could get coolant backing into the TB from that hose as well. So if you don't also close off the return side, you'll have coolant sitting in the TB. My thought is to use a diversion valve on the inbound side and the same valve on the return side. That increase the complexity of turning it on and off, but it does prevent coolant from flowing back into the TB. Just a thought.

 

Yeah, I was planning on using two valves. I'll just have to keep everything together, as simple as it can be, and labeled so I don't run with one valve the right way and the other the wrong way.

 

The only issue you would cause with that is coolant sitting in the TB. Not an issue for a short period of time, but worst case, you get build-up in the coolant chamber. Easy to clean out.

 

Hm didn't think about that. I tried to find some diversion valves at Home Depot and Lowe's but couldn't find any. If nobody's had problems with the regular bypass though, I think this is just a waste of time

 

agreed. it would be an added "cool" feature if you figured a way to do it with diversion valves, but definitely not necessary. and it isn't as though switching the tubes back to stock would take long anyhow. it's just a little messier with fluid spills.