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Old 06-24-2001, 02:50 PM   #1
jacktam1
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Default how to bypass coolent on throttle body?

anyone can teach me?
Thanks
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Old 06-25-2001, 02:12 AM   #2
Avenger
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Why are you trying to bypass coolant on the throttle body??
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Old 06-25-2001, 09:04 AM   #3
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Avenger,

It's a pretty common mod that helps cool the temperature of the intake by stopping the flow of hot coolant around the throttle body. I had it done on my Prelude, and the only side effect was a hunting idle at cold temperatures. It made a decent difference, though.

jacktam1,

All you do is find two tubes that go in and out of the throttle body and combine them somehow. There's a number of ways to do this, but the quickest is just to disconnect one totally, and plug the other into where it was coming out of the block, basically creating a single tube of coolant that comes out of the block and flows directly back into the block - effectively useless. If you want to get fancy, you can buy a few more peices of tubing and some T-shaped valves - this way, you can control the flow to the throttle body without having to connect and disconnect tubing.

Just make sure you do it when the engine is as cold as possible. Coolant will spill, and you don't want to burn yourself.

A friend of mine performed this mod on his 2000 RS after I did my Prelude. If I recall correctly, he said it made a difference, and I don't think he had the hunting idle problem I did. I have yet to do it on my RS.

Let us know how it goes. Good luck!
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Old 06-25-2001, 01:48 PM   #4
subarumantoo
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Exclamation

Just in case anyone was wondering why they run coolant throught the throttle-body: It is to prevent icing. Not because it is cold outside like in the winter time. Any time air goes from an area of higher pressure to an area of lower pressure, it drops in temperature. If you cruise for extended periods of time without moving the throttle plate, it can actually stick in that position for a few seconds! Summer or winter...

Last edited by subarumantoo; 06-29-2001 at 12:49 PM.
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Old 06-25-2001, 01:55 PM   #5
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so if we live in, oh say, southern california, there should be no downsides?
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Old 06-25-2001, 01:59 PM   #6
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Layman, thx a lot.
subarumantoo:I don't think my TB would be icing during this summer..
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Old 06-25-2001, 02:23 PM   #7
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I did this on my '94 Probe and plan on doing it to my RS. I added two valves, one on each side of the throttle body and a host that connected them.

I never had to worry about re-plumbing the coolant for winter, just throw the valves and it warms the TB back up again
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Old 06-27-2001, 03:23 PM   #8
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Which tube is the inle and which tube is the out let (when you are standing in front of the car)? I have some valves that I am going to put in line to stop the heating for the summer.
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Old 06-27-2001, 05:18 PM   #9
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It shouldn't matter which is which. Just put valves in both and open/close them at the same time.
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Old 06-27-2001, 07:16 PM   #10
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I just bypassed mine, and there was coolant in the driver's side hose, and not in the pass. side, so I assume that it flows from driver's -> passenger's. I got a brass hose fitting (double male) from AutoZone for $1.69, took off th airbox, and spliced 'em right up - 10min job.
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Old 06-27-2001, 07:36 PM   #11
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Don't suppose you notice any improvements from this?
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Old 06-28-2001, 06:58 AM   #12
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PICS?
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Old 06-28-2001, 02:14 PM   #13
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I also did this to my Honda. I can't say for sure I noticed any gains, because I think I did it at the same time I switched to a CAI extension.
But yes, I think it's a good mod as long as you're not living somewhere with cold temps. I'll probably do it when I get my Ganzflow.

-DAN
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Old 06-28-2001, 03:08 PM   #14
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yeah any pics? and what is icing?
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Old 06-28-2001, 03:58 PM   #15
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ice... as in, moisture in the air gets frozen, coats the TB
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Old 06-28-2001, 09:27 PM   #16
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Remember me? We met at Motor-R with Devo-2nd Gen. I am just wondering, what are you doing this for?? I had my throttble bored too.
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Old 06-29-2001, 03:32 AM   #17
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Quote:
Originally posted by IBO
Remember me? We met at Motor-R with Devo-2nd Gen. I am just wondering, what are you doing this for?? I had my throttble bored too.
sure man..
I'm doing this because the coolant is hot, it can reduce the heat on TB if the coolant don't go into it.
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Old 06-29-2001, 08:55 AM   #18
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Cool... Are you going to do it by yourself? Or you're gonna take it to the shop again? If you have done, do you mind me take a look at it? I guess I could use the same thing.
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Old 06-29-2001, 09:32 AM   #19
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People who are considering this mod,

I think perhaps it's sounding more difficult than it is. Just go out to your car and locate the throttle body. There should be two tubes connected to it that carry coolant. Once you've found those, you're halfway done! Just combine those tubes somehow. It is incredibly easy. You can do it in under 5 minutes, trust me. You shouldn't need any pictures and you certainly shouldn't take it to a shop to be done.

Again, just be sure to do it when the car is cold - like first thing in the morning.

If you need a better writeup, go to
http://members.tripod.com/~Pre_ludE/pmods.html
and scroll down to throttle body mod. I promise, this is something you can easily do yourself.
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Old 06-29-2001, 01:14 PM   #20
jacktam1
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IBO:sure
Layman: do I need to seal the holes on the TB or just leave its open?
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Old 06-29-2001, 01:54 PM   #21
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Well, I kept it open on my Prelude, but if you want, I'm sure putting some sort of cap on the throttle body wouldn't hurt anything.
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