C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

TB bypass?

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Old

Aug 8, 2003 | 07:25 AM

#1

Corvettehumlan

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From: Umea Vasterbotten

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TB bypass?

Whats that and how do U do it? :rolleyes:

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Old

Aug 8, 2003 | 08:20 AM

#2

Lone Ranger

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Re: TB bypass? (Corvettehumlan)

Living in a cold climate area such as Sweden, you might be better off leaving it alone. The coolant is routed through the throttle body to help prevent frosting of the throttle body during cold weather operation.

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Old

Aug 8, 2003 | 09:27 AM

#3

Strick

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From: Lake Wylie SC

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Re: TB bypass? (Lone Ranger)

:iagree: :yesnod:

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Old

Aug 8, 2003 | 10:05 AM

#4

vvv90

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From: Honolulu, HI

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Re: TB bypass? (Strick)

Or you can just take 5 minutes and put it back when the weather gets cold. The mod does not require you to butcher the hoses. Just plug 'em.

TB Bypass and Fan mod are a must for hot weather driving. Don't let anyone tell you differently.

Here's the C4 tech tip on how to do it.
https://www.corvetteforum.com/techti...D=61&TopicID=2

[Modified by vvv90, 9:06 AM 8/8/2003]

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Old

Aug 8, 2003 | 12:45 PM

#5

Lone Ranger

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Re: TB bypass? (vvv90)

Quote:

Or you can just take 5 minutes and put it back when the weather gets cold. The mod does not require you to butcher the hoses. Just plug 'em.

DO NOT PLUG the hoses! The TB gets its coolant feed from the steam tube-- the aluminum tubing that runs along the passenger inboard part of the valve cover. The steam tube receives steamed coolant from hot spots in the heads (if you look at back of motor there is a junction where the steam tube from driver side head passes its coolant to the steam tube from passenger side...passenger steam tube then routes this coolant to the tb) and condenses it back to liquid coolant. The flow of the liquid coolant back into the system must be preserved! You want to *bypass* it, not *plug* it. When you bypass you are still letting the coolant from the steam tube circulate back to the system, it just does not go through the throttle body any longer. If you plug the steam tube you risk warping or cracking the aluminum heads.

[Modified by Lone Ranger, 11:55 AM 8/8/2003]

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Old

Aug 8, 2003 | 01:17 PM

#6

vvv90

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From: Honolulu, HI

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Re: TB bypass? (Lone Ranger)

:iagree:

You're right. I didn't plug mine, I have a brass coupler in mine. Do the same and you can't go wrong. If it's a problem, I'm surprised the part about plugging them is listed in the tech tips section. They should edit that part out.

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Old

Aug 8, 2003 | 03:42 PM

#7

cicch95

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From: Pomfret, CT

Finalist 2020 C4 of the Year - Unmodified

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Re: TB bypass? (vvv90)

:iagree: They must be coupled together. I made a tube from aluminum.

-Rick

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Old

Aug 11, 2003 | 12:15 AM

#8

Corvettehumlan

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From: Umea Vasterbotten

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Re: TB bypass? (Corvettehumlan)

Thanx for all the answers guys! :cheers:

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Old

Aug 11, 2003 | 12:28 AM

#9

AGENT 86

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From: Summerland B.C. Canada

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Re: TB bypass? (Corvettehumlan)

Save your time !!
It stays cool for a while then all the engine heat transfers through.
I'll be returning mine to original soon.
:cheers:

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Old

Aug 11, 2003 | 12:10 PM

#10

vettek50

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From: edmonton ab

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Re: TB bypass? (AGENT 86)

:iagree: DO NOT PLUG ,, BYPASS IS THE PROPER WAY.

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Old

Aug 11, 2003 | 01:18 PM

#11

fiberglasscoffin

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From: sussex nj

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Re: TB bypass? (Corvettehumlan)

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Old

Aug 11, 2003 | 09:22 PM

#12

0to60n4.5

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From: National City MI

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Re: TB bypass? (fiberglasscoffin)

Nice ALL WHEEL DRIVE C4 you have there. Your making all the heat your TB needs in that pic. :D

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Old

Aug 12, 2003 | 12:41 AM

#13

fiberglasscoffin

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From: sussex nj

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Re: TB bypass? (0to60n4.5)

Quote:

Nice ALL WHEEL DRIVE C4 you have there.

i dont get it? :confused:

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Old

Aug 12, 2003 | 06:41 AM

#14

FX GS

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From: Camp Hill PA

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Re: TB bypass? (fiberglasscoffin)

I thought he blew a radiator hose!! :eek: :rolleyes: :lolg:

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Old

Aug 12, 2003 | 08:51 AM

#15

silver & red CE

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From: NW Chicago Suburbs

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Re: TB bypass? (Lone Ranger)

Quote:

Living in a cold climate area such as Sweden, you might be better off leaving it alone....

Actually, the frosting issue isn't anything to worry about. I've been driving my Vette and Impala SS with the bypass for over 6 years now, no problems with frosting. While Chicago isn't as cold as Sweden, we get our fair share of sub zero (F*) weather here. The issue isn't how cold it gets, but rather when there's lots of moisture in the air and it's just above freezing. In theory that's when the pressure drop across the TB blades could cause icing. But as we all know, air isn't a great gas for making a refridgerator. Really this is a legacy from carb'ed cars, the gas evaporating is a great refrigerant, just look at a 60's Corvair.

Eric

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