L98IROCZ1987

Im getting ready to put a Holley Stealth Ram setup on my 87 Iroc .
I have a 58mm throttle body and I would like to run it without the coolant in the tb. Any opinions?

antoine

That's one of the first mods to do is bypass the coolant going thru the throttlebody.it will run fine

navy02ws6

I've been running my '02 with the coolant bypass mod for almost 10 years...no problems other than a minuscule decrease in mileage. Did mine out of necessity though, bought a used ported tb and the coolant inlet was broke off.

92droptopws6

iTrader: (10)

No need for it! We remove them to get heat away from the Plenum....
We want as cool of an air charge we can get.... I have done this mod since 1989 on all my cars

vetteoz

iTrader: (13)

ibmtech

iTrader: (1)

Once, I started to change my engine around, I found it to be not necessary and removed it..

TPIVette

One of the biggest benefits is you'll then be able to remove the TB without messing with coolant lines.

cjberquist88

does it actually help anything or is just more convenient when it comes to taking off the TB...

Guest

Cooler IATs and less for the cooling system to cool (heat up)

vetteoz

iTrader: (13)

Makes no difference ,the intake (and TB connected to it ) get most of their heat from the engine
Do the TB bypass , drive your car for 20 miles and then see if your TB is any cooler than before the bypass

sofakingdom

iTrader: (1)

Most cars have something similar.

Don't forget, the factory has to do things to make cars world-wide universal off the production line, and cover all foreseeable variations in operating conditions; emissions, weather, fuel, whatever all else. Not every adaptation is "necessary" or even "desirable" in ALL circumstances.

Removing it makes very little difference to driveability or mileage that I've noticed, except in very cold climates.

cIaRmOaCrZo

primary function of it is to keep tb from iceing up in the colder climates below freezing. ditch it.....

Guest

It is, Iv had the bypass done for years...if your is hot you need a better cooling system...

bestracing

Yup!!

navy02ws6

I thought it was an emissions feature to help the car warm up quicker? Warmer air = warmer engine...

cIaRmOaCrZo

primary was the key word. doesnt mean there are no other functions or use for it.

navy02ws6

Right...didn't see your post before I responded, and I couldn't delete it.

vetteoz

iTrader: (13)

Close hood ;everything heats up to same temp from heat soak

In any case if what you believe is true, you are dealing with a boundary layer where only the slow moving air touching the TB bore can pick up heat.
The bulk of the airflow flows inside this layer and is not affected by heat transfer ;even less so as the TB is opened and more air flows

IROCgiraffe

iTrader: (3)

Glad I found this thread. Found another mod to add to the list.

fireburdluvr85

been running it for 3 yrs now. no adverse effects.

Pat Hall

iTrader: (31)

Mine's bypassed, and temps around here have been around 0 degrees to 15 degrees the last few weeks, and still no adverse effects whatsoever.

Guest

Same here. Also-still cooler IATs.

Pat Hall

iTrader: (31)

Yeah, speaking of IAT's, that's another mod I did to mine. I got a V6 intake duct and relocated my IAT sensor to the air duct instead of it being on the bottom of the intake plenum.

the blur

That's creative to remove the water passage in the bottom plate. I could have saved $2 buying stainless steel bottom screws. Not to mention the 2 rubber caps.

Guest

Thats the MAP sensor.

Pat Hall

iTrader: (31)

Wrong, the MAP sensor is on the back passenger side of the plenum. IAT, or Intake Air Temperature sensor is on the bottom of the plenum. My car is an 89, which doesn't use a MAP sensor anyways, just a MAF sensor. You get a more accurate air temp reading with the IAT sensor in the air filter ducting. When it's in the bottom of the intake plenum, you've got all the surrounding engine heat that affects the reading.

Pat Hall

iTrader: (31)

On mine, I didn't go quite that far in cutting up the bottom plate. I just took a cutoff wheel and removed the 2 spouts where the coolant hoses go on. You can leave the coolant passage unplugged and it doesn't affect anything since it's not being used any more. The throttle body looks cleaner with the spouts removed and it gives you more room when removing the water neck to replace a thermostat.

cs80camaro

I did this mod on my fiero years ago

ASE doc

The water passages in the throttle body are to prevent icing in very cold climates. If you are in Alaska or anywhere else where freezing temps are common, you may want to keep the passages in place. Anywhere else, they aren't necessary. The first time your throttle sticks open after several minutes on the highway on a very cold morning, you'll know why the engineers ran coolant through the TB. The pressure drop across the throttle causes the air temp to drop and ice to build up. As far as cooling down the inlet air charge, that's very beneficial. Think about making the hood louvers functional on your IROC and installing cold air or ram air intake.

navy02ws6

Alright, this makes sense now...the throttle cable was starting to stick for the first time last week since it was BRUTAL cold outside here in Atlanta (coldest it's been in at least a year). Never a problem at any other time though.

Starting to wish I didn't buy a TB with a broken coolant passage regardless...

eseibel67

This response is old, but I would still like to comment.

After driving for 20 miles with the TB bypass, YES -the TB will be cool to the touch, and will continue to be cool as long as the engine is idling. Shut the engine off and heat soak will work it's way up the runners and up to the TB.

eseibel67

Also, I'm not sure whether cooler TB directly has any performance benefit, but I'll take the cool TB over a hot TB any day.

hotrodgss1

I know this threat is over a year old but I was wondering if anyone has ever thought of using the TB coolant passage as a way of cooling the TB in hot climates? I was thinking of connecting a length of hose to the forward facing spout and a deep funnel to the other end of the hose. The funnel would then be mounted in such a way (possibly towards the bottom of the car) so that it would collect cool air from the front and force it through the TB. Anyone?

Tuned Performance

iTrader: (92)

????? Toss some ice on your plenum lol

1991sleeper

iTrader: (-3)

It would b more effective to run cool water through it ..im not a tpi guy ... but u could use like a trani cooler with a small electric pump like a cheapo fuel pump to pump water through

IROCgiraffe

iTrader: (3)

There is no need to "cool" the throttlebody . Just be removing the hot coolant lines running to the throttlebody cools the upper intake system dramatically. So much so, after driving you can usually touch the plenum, runners, throttlebody without burning your fingers instantly.

hotrodgss1

Overall intent is to cool down the incoming air charge even more without investing too much time or $$$. Ice is great for race day but not for daily driving. I thought about building a separate cooling system like the one 1991sleeper mentioned (using an 81 Corvette windshield washer reservoir with built-in 12V pump & a small aluminum tranny cooler) but it's a bit time consuming (but not necessarily a bad idea). In the end, I figured the "ram air funnel" setup would be the easier & cheaper way to go.

vetteoz

iTrader: (13)

As previously mentioned above ; GOOGLE " boundary layer"

Only very proportion of the airflow is in actual contact with the TB bores so the effect of a " cold " TB would be minimal.

If you want to cool the incoming air you need something mounted directly in the airflow it self

Like the DEI CryO2 system that has a small inter cooler in the intake ducting and uses CO2 to cool it .
Wired through the TPS , it is only activated when you go WOT.

http://www.turbomagazine.com/insidet..._system_cryo2/

http://www.designengineering.com/con...get-more-power

Tuned Performance

iTrader: (92)

Pat Hall

iTrader: (31)

Yeah I gotta agree with 1991 sleeper, running an electric pump and a tranny cooler or something like that would probably be the most effective way of doing it. However, the end result would probably be such a minimal difference that it's probably not worth the time or effort. As others have already said, just eliminating the hot coolant running through it is usually the most you really need to do.

transamgta1Khp

mine been broke off for over 20 yrs. no problems.

eshaw

I'm removing the coolant portion. The other part is for the egr system, correct? Why can't that be eliminated as well if egr is required for emissions?

nomind

It's not EGR, it's the IAC.