I've heard that you can gain a few ponies by bypassing the coolant line around your throttle body, which results in lower temperatures when intake air passes through the throttle body. This makes perfect sense.

But are there any negative effects to this?

If not, is this a poor design from Honda or is it required for some compliance reasons?

 

If you live in a really cold climate like where it snows, the throttle plate can get stuck.

 

i had a flunctuating idle with that mod

 

Pro's: None. You won't gain any hp.

Con's: None, unless you live in a REALLY cold climate.

 

I did this on my CRX with a B16A top end was a bit better when i came off the highway the intake was frozen cold.

 

So who's got dyno numbers or evidence to prove or disprove this mod?

Wouldn't it make sense that power would be made if the intake air stream is passing through a colder TB and IM rather than a warmer one?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Al Bundy &raquo;</TD></TR><TR><TD CLASS="quote">If you live in a really cold climate like where it snows, the throttle plate can get stuck. </TD></TR></TABLE>

due to the throtle plate freezing.

Good mod if you not in FREEZING weather-dont know about dyno #'s but it just makes sense to keep the hot coolant away from the throtle body

 

coldest air = first step remove any heat source from the IM/TB, just run the hondata race gasket.

I current have the coolant by passed in my TB... I see no cons.. the only this is that your car doesn't rev up to 1.5k'ish during warm-up. It drops straight to idle, so i baby it when i first take off w/ my car.

 

well i have the coolant bypassed on mine, and i dont know if this was direct effect but my iac valve is jacked, and this was maybe like 2 mos after bypassing it.
maybe froze, maybe just a coincidence..
i have heard it seriously is only like a 1/2 hp increase IF that.

 

ive heard of F body guys doing that for hp, hp gain is all in percentage to how much u start out with in the first place, in most of our cases its not alot so i dont think the gain in hp would be worth it, unless your in a year round warm or even hot climate. idk if that made sense, it always seems like its really late at night when im on here typing post.

 

The only thing i noticed was cold start and when its cold out i mean frost wether it runs like crap for a bit.

 

on my CRX it's bypassed. It was bypassed not for horsepower, but for simplicity. Now there are two fewer hoses to worry about. It cleans up the engine bay a little, too. Plus it saves a very tiny bit of weight, but on our CRX any weight off the front end is a good thing.

it takes a little longer for the idle to drop, but no big deal. in theory, it should gain horsepower, but who knows... I don't really care if it does or not.

 

I had it bypassed on my H23; it didn't feel any different, but it made my idle fluctuate, i.e.- it rised and fell from 1.5k to 800 and back almost all the time.

I heard there's something in the TB you can plug that will fix that, though.

 

https://honda-tech.com/zerothread?id=596485

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMCRX &raquo;</TD></TR><TR><TD CLASS="quote">I did this on my CRX with a B16A top end was a bit better when </TD></TR></TABLE>

i dont think its worth it on cold days when you have a shitty idle and have to wait to actually drive it like you want

 

well i would start my car and i would not drive my car tell it was warm and then not one prob dunno.