corveteer

Looking for ideas on how to do throttle body bypass
1. kit from ecklers --a piece of pipe
2. new hose run from radiator to T on driver side where
throttle body hose did connect
3. proper size bolt and hose clamp in
each hose at throttle body---
which would block flow of coolant
is it ok to block of this flow?
Thanks for your help

Bill Curlee

BARBBED MALE to MALE brass fitting from Home Depot ($3.00) Two hose clamps AutoZone, $1.99 BAM,,,, your done

The hoses are Two different sizes. Dont let that bother you. Get a fitting that the small hose will expand over and the large hose will clamp on to. I installed the fitting where the hoses meat at the TB. DONE!

manley845

I found a nylon (or whatever) hose slice at Advance Auto for less than a dollar and then reused the existing clamps. I only did the by-pass because I had to remove the throttle body and figured I'd do the by=pass now and not have to disconnect the coolant line if i ever remove the TB again.

Gradient

What does this bypass achieve? More HP?

fastyellowss

I was gonna ask the same question.

kmetros

The two hoses that get connected together to bypass the throttle body are originally connected to each side of the throttle body. Coolant flows in through one hose, around the throttle body, and back out the other hose on the other side. The reason that manufacturers do that is because when it's really cold out and the engine is stone cold it's possible for condensation inside the intake to freeze. In this case, the condensation inside the throttle body. If ice accumulates around/on the throttle body or butterfly while you are driving, then when you take your foot off of the gas the throttle body won't close all the way. That will cause all kinds of problems with idling, but the bigger problem is that with automatic transmission cars the engine will be racing at 'idle' causing the car to want to GO while you're standing on the brake at a red light trying to keep the car from rolling. The warm coolant keep ice from forming around the outside of the throttle body, preventing the butterfly from closing. It's really a system who's purpose is served the first several minutes of driving. After that heat soak from the engine will keep ice from forming on the TB.

This is standard practice on modern cars and a trick that has been around for quite a while - all three of my Taurus SHO's has their TB's bypassed. Since most Corvette owners don't drive their cars when it's cold enough for ice to form around the TB we just bypass them since HOT coolant running around the perimeter of it the rest of the time just heats the intake air that is passing by it. Cold air is denser and will produce more power than hot air, hence the reason people bypass the coolant lines.

Make sense? I don't think I misspoke, but if I did let me know. Still on my 1st cup of coffee!

Paul 75 L82

You can get 1/4" rubber caps from the parts store to put on the TB hose outlets, they don't need clamps.

corveteer

THANKS GUYS FOR HELPING WITH THIS
JUST ONE MORE QUESTION---
IS IT OK TO BLOCK OFF ALL COOLANT FLOW THRU
THROTTLE BODY PATH?
do not want any cooling problems for rest of engine
thanks

kmetros

I've never disrupted the flow of the coolant - I've just bypassed the TB. Bypassing it allows the coolant flow to continue as the engineers designed it to. That being said, I have no idea of where the coolant hoses come from or where it goes to on the other side of the TB, so maybe it really doesn't matter if you just plug them.

MTPZ06

Not worth any HP whatsoever. As previously stated, it does make for easy removal of the TB & intake for future mods.

And rather than using a piece of tubing to conect two hoses, you can just go buy one longer hose at the auto parts store. Less clamps, less places to leak.

Bill Curlee

Its been off my 02 ZO6 since 04 and no issues. In fact, the 05 to present C6 cars don't even incorporate one in the TB.

It was one of those things the GM decided to do to cover one EXTREME weather condition that may happen to someone some where some how. Ive only experienced TB Icing once in my life and that was on an old Small Block Chevy with a carb.

You will be fine with out it..

BC

Gradient

Thanks for the answers guys, much appreciated.

manley845

Here's pics of mine. Again, only had to buy a dollar splice.

You can also just block it off without issue.

G.C.

thanks guys needed the advice getting oldddddd

JOHN RICCIARDI

can anyone tell me what size replacement hose to buy to complete the by-pass mod ???

jamieo

May want to start a new thread This one was last replied to almost 7 YEARS AGO!

kentsimon

it's 5/8" out of the block on my 85, I'm not sure what the other side is stock because my heater valve and the tee for the oil cooler have been replaced a few times already, the heater valve is 3/4" to the throttle body. just replaced all the hoses this last week, including the oil cooler hoses.

Kent

JOHN RICCIARDI

[QUOTE=kentsimon;1598630414]it's 5/8" out of the block on my 85, I'm not sure what the other side is stock because my heater valve and the tee for the oil cooler have been replaced a few times already, the heater valve is 3/4" to the throttle body. just replaced all the hoses this last week, including the oil cooler hoses.TH

THANKS KEN, I APPRECIATE YOUR HELP MY FRIEND;

Gene805

John, what hose size did you end up going with? Any particular part number or description that worked?

Bill Curlee

A NOTE AND POSSIBLE WARNING!!!!!!!!!!! What ever you do,,,,,,,,,, DO NOT,,, use a PLASTIC BARBED FITTING to connect the hoses together. They are easy to SNAP and really not made for a heated pressurized coolant system.

Find a stainless or brass/bronze barbed fitting.. If you have a plastic barbed fitting, I STRONGLY recommend changing it out for a metal fitting.

This has been a public service announcement!

Bill