Question on TB By-pass
Thread Starter
Melting Slicks
Joined: Apr 2000
Posts: 2,408
Likes: 3
From: Bel Air Md
Question on TB By-pass
I know the coil in the TB is to introduce warm air in the engine in cold weather, what does by-passing do. What advantage to the engine. Does it help in hot weather not to have the coil??? 
By coil, I felt there must be some type of heat exchanger coil or just a straight pipe through the TB
[Modified by HG, 11:21 AM 6/11/2002]
By coil, I felt there must be some type of heat exchanger coil or just a straight pipe through the TB[Modified by HG, 11:21 AM 6/11/2002]
Race Director
Joined: Jul 2001
Posts: 13,710
Likes: 0
From: So Cal
Re: Question on TB By-pass (HG)
I have a 94 and don't know much about earlier ones, but if you don't live in freezing temps than you really don't need it. Mine is bypassed simply because cooler air is better. :cheers:
Melting Slicks
Joined: Oct 2000
Posts: 3,426
Likes: 4
From: Heidelberg PA
Cruise-In V Veteran
Re: Question on TB By-pass (HG)
I am not sure what you mean by coil?
But the bypass lowers the temp. of the throttle body.
Lowering the temp of the TB then lowers the air temp.
Cooler air = More power.
By itself, this mod is minimal, but it can add up with other mods.
But the bypass lowers the temp. of the throttle body.
Lowering the temp of the TB then lowers the air temp.
Cooler air = More power.
By itself, this mod is minimal, but it can add up with other mods.
Team Owner
Joined: Apr 2002
Posts: 28,747
Likes: 41
From: Frankenstein never scared me. Marsupials do, because they're fassst…and they DART, THAT'S crazy!
St. Jude Donor '03 thru '26
Re: Question on TB By-pass (85vet)
I am not sure what you mean by coil?
But the bypass lowers the temp. of the throttle body.
Lowering the temp of the TB then lowers the air temp.
Cooler air = More power.
By itself, this mod is minimal, but it can add up with other mods.
But the bypass lowers the temp. of the throttle body.
Lowering the temp of the TB then lowers the air temp.
Cooler air = More power.
By itself, this mod is minimal, but it can add up with other mods.
I got my C5 TB bypass through Ecklers but I can’t find one for my C4. I can’t even find the tubing at Lowe’s to make my own with either. :( 
Le Mans Master
Joined: Feb 2001
Posts: 6,022
Likes: 37
From: SW Fla
Re: Question on TB By-pass (morphious)
I have a 94 and don't know much about earlier ones, but if you don't live in freezing temps than you really don't need it. Mine is bypassed simply because cooler air is better. :cheers:
Team Owner
Joined: Sep 2001
Posts: 62,171
Likes: 1,735
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: Question on TB By-pass (HG)
GM put it in so that the plates in the TB wouldnt freeze in cold weather. Only problem is it has to get DAMN COLD outside, like Montana-North Dakota in winter type cold, for them to freeze up, and not many people up there drive vettes in winter.
cooler intake charge=more hp, not alot but it helps
cooler intake charge=more hp, not alot but it helps
Le Mans Master
Joined: Aug 2000
Posts: 5,192
Likes: 1
From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
Cruise-In II Veteran
Re: Question on TB By-pass (The^Nomad)
I can’t find one for my C4. I can’t even find the tubing at Lowe’s to make my own with either. :(
Team Owner
Joined: Apr 2002
Posts: 28,747
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From: Frankenstein never scared me. Marsupials do, because they're fassst…and they DART, THAT'S crazy!
St. Jude Donor '03 thru '26
Re: Question on TB By-pass (War Machine)
I've seen it on the Help! shelf (Pep Boys) as a heater hose connector. It was $2.50 or so. I bought the same thing at Bumper to Bumper with 2 clamps for under $2. :)
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Team Owner
Joined: Apr 2002
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Re: Question on TB By-pass (HG)
Chevrolet has it set up so coolant goes through the block and through the throttle body, that way when it gets to something like 20 degrees F it won't get stuck in one position (Imagine going to the track when it's really cold and hammering the throttle, and when you make your run and let off the gas the car keeps going) :smash: . Anyway, when I had a WS6 Formula I did the bypass on my own with quite a few trial and errors. Tubing was always too thick or wasn't able to handle the high pressure or heat. The reason you want to make your own is the pulleys will rub your tubing raw the way that it's set up with kits. I have seen it happen sooo many times, you will want to make your own and route it OVER the throttle body, away from the pulleys. Advice from experience :)
[Modified by GDP, 7:54 PM 6/11/2002]
[Modified by GDP, 7:54 PM 6/11/2002]
Safety Car
Joined: May 1999
Posts: 4,445
Likes: 0
From: Mandeville, Louisiana
Re: Question on TB By-pass (The^Nomad)
I just did mine today...why did any of you need to buy anything? I simply took the hose from the driver's side and plugged it to the tube running up the passenger side under the fuel rail cover. I then put a couple of vacuum caps over the passages that were sticking out of the throttle body to finsh it off. No kit required.
Le Mans Master
Joined: Aug 2000
Posts: 5,192
Likes: 1
From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
Cruise-In II Veteran
Re: Question on TB By-pass (The^Nomad)
Excellent, now If I only had a Pep Boys or Bumper to Bumper around here. Mayhaps I’ll try Auto Zone. :confused:
Le Mans Master
Joined: Aug 2000
Posts: 5,192
Likes: 1
From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
Cruise-In II Veteran
Re: Question on TB By-pass (Jim85IROC)
Any hardware store is good too. Only problem here in Il. is I can get in and out of a parts store 5 x before I was done once at a Home Depot or Menards. They are slow as heck and open only 3 of the 12 regisers.
Racer
Joined: Jun 2002
Posts: 260
Likes: 0
From: Olathe Kansas
Re: Question on TB By-pass (HittinD.Apex)
Anybody know of a manual override kit for a TB bypass? It gets way cool here in KS in the winter, and it would be nice to be able to turn a valve to keep the plates from freezing up in the winter, then turn the valve again to run in warmer temps. Has anyone ever heard of such an animal? :conehead
Safety Car
Joined: May 1999
Posts: 4,445
Likes: 0
From: Mandeville, Louisiana
Re: Question on TB By-pass (HittinD.Apex)
Well, before the mod my LT4 was just fast...and now its really fast!!!
No really, I don't have numbers, and the mod alone probably isn't noticeable, but when you add it to a K&N filter intake, and some free flowing exhausts...it makes a difference.
Think about it...take cool air from the front of the car...but then heat it up to 200 degrees in the throttle??? No sense!!!
I can tell you that after the Hypertech Stat, and reprogrammer, and the TV Bypass, my car never gets over 182 degrees...ever.
[Modified by Eric 96, 5:30 PM 6/13/2002]
No really, I don't have numbers, and the mod alone probably isn't noticeable, but when you add it to a K&N filter intake, and some free flowing exhausts...it makes a difference.
Think about it...take cool air from the front of the car...but then heat it up to 200 degrees in the throttle??? No sense!!!
I can tell you that after the Hypertech Stat, and reprogrammer, and the TV Bypass, my car never gets over 182 degrees...ever.
[Modified by Eric 96, 5:30 PM 6/13/2002]
Le Mans Master
Joined: Aug 2000
Posts: 5,192
Likes: 1
From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
Cruise-In II Veteran
Re: Question on TB By-pass (HittinD.Apex)
Hmmm. OK so can anyone actually give any figures (hp/temp) on actual improvements? Or is it one of those "just a feel" things? :rolleyes:
A cooler intake charge and a much cooler "feeling" plenum. ;) :lol:
Le Mans Master
Joined: Jun 2002
Posts: 6,097
Likes: 0
From: High Plains Drifter Fayetteville, AR
Re: Question on TB By-pass (HittinD.Apex)
I can "feel" any 5hp increase in a cars power. My calibrated butt comes in handy sometimes, lol. If the intake charge is "significantly" (15-20 degrees) cooler than without the bypass, I'd say 5-10 hp, depending on ambient temps. Just a guess though.
J
J