JsL138

What do you guys think about this? I live in CA, and it never drops below zero here.

Mod

TLAdvanced

iTrader: (4)

Huh, this is a common mod for american small blocks... Seems like it should work, but gains are small.

I hate cars

I did it last year. The TB stays cool to the touch now where before it was too hot to touch. No problems in the winter.

t0talacuratl

iTrader: (3)

Isn't this the power adder option on the AEM CAI?

evanj5

No, thats switching the sensor.

I want to know how to do this, Im gonna try taking a look.

TLAdvanced

iTrader: (4)

Here's the thread https://acurazine.com/forums/showthr...ghlight=bypass

Bearcat94

Couple more for you:

https://acurazine.com/forums/showthr...Coolant+Bypass

https://acurazine.com/forums/showthr...Coolant+Bypass

jchcmax

I'v done this for about a month to see how it goes. The engine seems to run richer(fuel). My gas mileage decreased so I put it back to normal. Not worth it for me..

I hate cars

That's just about impossible. On one hand people on here claim a couple mpg bump with a CAI but with a cooler TB it causes a decrease in mileage. It will have very little effect on the incoming air charge. It's one of those "why not it's free" mods and every little bit helps but you won't feel a difference in power or fuel economy.

godfather2

tsx guys are all over this mod ... quick, easy, and useful

anx1300c

iTrader: (2)

Might as well wrap your intake tube with insulation if you're going to do this mod.

NedShneebly

I read more posts stating no gain or poor mileage when I installed my AEM.

flydog

Actually you are both wrong. Cold air is denser so the engine would run leaner with the coolant bypass disconnected. However, the mass airflow sensor compensates for temperature and density and will richen the mixture automatically. That means it will run at exactly the same ratio as before (not leaner or richer) but it will use slightly more fuel. Probably not enough to be noticeable.

jchcmax

Ok then, I did this in the winter but am going to try it again now before the summer gets here. If my MPG suffers again, I'll switch it back.

I hate cars

That would be great if the TL used a mass air meter, but it's a speed density system. You would still be wrong on a mass air car because the TB is after the meter.

The 02 sensor will keep things in check if the calculations are off a little. Doesn't really matter because we're talking a very, very small temp reduction. If it weren't free, I wouldn't do it.

pwrdbykmfdm

ive done this mod on every car ive had: 00 civic ex, 92 civic si w/ integra ls swap, 02 civic ex, and my last, 05 rsx-s.
it does not give you more hp, it only keeps your TB cooler so that you keep the hp you have with a cool engine, will stay longer as your engine and underhood ambient temp go up.
for example, we all know when we first go out driving our cars feel fast, then as it gets hotter(the engine), it doesnt feel as fast.
this mod will keep your engine running almost as it was in the first 30 min of driving.
it also helps to paint your CAI with high-temp paint, it will keep the inside of the pipe barely a little cooler, but that mod, although it works, its a little useless and the paint can get all scratched up.

evanj5

The sensor that you have the option of swapping with the CAI will add more fuel and advance timing, not make you run leaner.

flydog

They both do the same thing. Adjust air/fuel ratio depending on temperature and/or density.

Spiritman

I did this in 2006! We get some nasty cold here in Minnesota. No problems at all. Just better gas usage!

I hate cars

If they did the same thing, we would have one or the other, not both. A mass air meter can't adjust for changes after the meter like vacuum leaks or a cooler throttlebody. 02 checks the calculations of the MAF or speed density after combustion.

JsL138

When installing my AEM intake, I just did the mod anyways, since I had to reroute the coolant hoses.

I noticed that the TB is cool after driving on the freeway...anyone who didn't bypass it notice that their TB is hot after the freeway?

evanj5

Yeah my TB no longer gets hot anymore, cool to the touch. The p2R spacer really helps this mod work perfectly.

I hate cars

When I was getting ready to do this, I popped the hood several times the day before and the TB was always very hot to the touch, too hot to leave my hand on for more than a couple seconds. Now, it's always cool right when I shut the engine down but will heatsoak a little after shutdown.

Tripnbeats

I have it done and havent noticed any gains or loses from gas or mileage and the car does run like u just started it up.... all the time.

evanj5

We need more mods like this

Im thinking colder spark plugs for me next, what do those run?

I have also heard making the coolant a 40/60 mixture versus a 50/50 will make the engine colder as well.

OH OH and I also read that if we can figure out a way to trick the computer to think that the EGR is not working then the ecu will add more gas and pull back timing which I believe would give more power on our cars (well especially mine cause it pings) just dont know what kinda of CEL it would throw as well

ummmmm....

Does the engine cover increase engine temps?, what about all the other pieces of plastic in the engine bay, would removing them help keep temps down???

I am definatly going to get synthetic on my next oil change as this should reduce engine friction and temps,



Any other ideas or comments ?!?!?!?!?!? little things like this are fun to tinker with

Tripnbeats

lol evan, havin a bad day are we?

evanj5

Man I have been having a bad couple of months, you have no idea, my car is probably the only thing keeping me sane

jdmitr22

i did mine today! lol forgot to plug the little sensor on the TB back on the top and almost shit a brick when i thought my car was gonna blow up on me haha but it seems to run better on the butt dyno.

Inaccurate

Summer must be getting near.... I have been receiving several PM asking for advise for doing the coolant bypass. Here are a few photos of how I did mine. Hope it helps those that are looking for a HOW-TO. Cheers

JsL138

^Thanks for the pics...thats exactly what I did.

don5504

I did this last night. Took me all of 10mins and 5mins of that was looking around to make sure I had all the hoses right.

D

TylerT

iTrader: (1)

What do these hoses even do? Why aren't they necessary?

Do I need to buy a whole new tube just for this mod, or use the ones off my car?

don5504

They supply coolant to your throttle body so in extremely cold climates the TB doesn't freeze up and stick. For some of this its not a problem and never will be due to our regional climates. But some of you who live up north who have brutal winters its a possibility.

And you should not have to put anything I just reused the hoses that come with the car. Its super easy and there is a picture above to show you how it goes.

D

ayethetiense

i just did this mod a couple days ago. thanks for posting the pics to make me feel more comfrotable with it. wasnt sure if i rerouted the hoses right.

question, doesnt this mod negate the need for the TB spacer? since the heat experienced comes from the coolant warming up the TB, this mod has the TB not getting hot.

i know the engine gets hot too, and the TB spacer makes it so that the heat doesnt transfer from the engine. but if the TB is staying cool when moving and the TB is between the engine and the intake, then it doesnt matter that much if at all right?

TylerT

iTrader: (1)

Just did the mod, the car definitely doesn't feel like it gets heat soaked after driving ... I love it.

My only suggestion is, have a towel handy in case any antifreeze leaks out.

evanj5

I think this actually makes the TB spacer even better, I mean now the TB spacer stays super cool and I believe that increasing the amount of volume that is before the IM is another reason the TB spacer is put on. And without the TB spacer wouldnt the TB still get kinda hot from the IM?

I hate cars

The stock gasket does a good job of insulating the TB from the intake manifold. My intake is warm while the TB is cool.

t0talacuratl

iTrader: (3)

Well I just did this mod. Hope I get the same results.

Thanks Inaccurate! The pics were a big help!

ayethetiense

i think im losing a bit of gas mileage. i havent changed the way i drive. can someone who knows whats going on chime in on this?

you know when you first start the car, the engine revs a bit higher until it warms up and that uses a bit more gas... is it possible that sensor is in the throttle body? does that mean at idle, it is using more gas thinking it is not warm enough?

I hate cars

The coolant sensor is the main input for this and it's always located in the primary (water) cooling circuit, usually near the thermostat.

The only thing that could cause a high idle would be if you accidentally knocked a vacuum line off or left a sensor unplugged.