TBI Colant Hose Bypass
Safety Car
Joined: Dec 2006
Posts: 4,290
Likes: 6
From: St Marys GA
I don't have an exact procedure written out for you, but basically here's the gist:
1-Partially drain the coolant (complete drain isn't necessary, just enough so that coolant won't flow out of the TB lines)
2-Disconnect coolant lines from TB (one on passenger side, one on driver's side)
3-Connect them
#3 is probably the most difficult, but there are a few methods. I don't know the exact size, but if you found a tube or pipe of the same inner diameter as the rubber hoses, you could just stick that inside and use a caterpillar clamp on each hose to keep it clamped down. Some of the Corvette vendors sell kits to do this, but they're all overpriced. With a little research and a local hardware store, you can do it for a few bucks easily.
That being said, mine came with the bypass done in a much more subtle way. Wherever the coolant line to the TB comes out of, it was capped off there, so there isn't even a line running to the TB. I didn't do it, so I can't comment on exact procedure, but that's something to think about. Some sleuthing around under your hood should be able to figure that one out.
1-Partially drain the coolant (complete drain isn't necessary, just enough so that coolant won't flow out of the TB lines)
2-Disconnect coolant lines from TB (one on passenger side, one on driver's side)
3-Connect them
#3 is probably the most difficult, but there are a few methods. I don't know the exact size, but if you found a tube or pipe of the same inner diameter as the rubber hoses, you could just stick that inside and use a caterpillar clamp on each hose to keep it clamped down. Some of the Corvette vendors sell kits to do this, but they're all overpriced. With a little research and a local hardware store, you can do it for a few bucks easily.
That being said, mine came with the bypass done in a much more subtle way. Wherever the coolant line to the TB comes out of, it was capped off there, so there isn't even a line running to the TB. I didn't do it, so I can't comment on exact procedure, but that's something to think about. Some sleuthing around under your hood should be able to figure that one out.
Safety Car
Joined: Dec 2006
Posts: 4,290
Likes: 6
From: St Marys GA
As florida said, the primary reason is for a colder intake charge, therefore denser, therefore more powerful engine. In reality, the difference isn't much, but it is there.
In my experience, the first reason, of less mess to remove the TB, is the most important. I've removed my TB probably 15 times in the 1.5 years I've owned the car, and it's just a 4-bolt remove a few air hoses affair. Extremely simple. Bringing coolant in would really wreck my world.
In my experience, the first reason, of less mess to remove the TB, is the most important. I've removed my TB probably 15 times in the 1.5 years I've owned the car, and it's just a 4-bolt remove a few air hoses affair. Extremely simple. Bringing coolant in would really wreck my world.
Safety Car
Joined: Jan 2008
Posts: 3,939
Likes: 1
From: Vero Beach Florida
In my experience, the first reason, of less mess to remove the TB, is the most important. I've removed my TB probably 15 times in the 1.5 years I've owned the car, and it's just a 4-bolt remove a few air hoses affair. Extremely simple. Bringing coolant in would really wreck my world.
Last edited by floridamale; Apr 14, 2009 at 05:48 PM.
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Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Probably the easiest way is to just insert a SS Bolt,head cut off,or Ball Bearings inside each hose and put back on the T.B.?
Viola ! No Flow.
Viola ! No Flow.
Last edited by CAJUN C4; Apr 18, 2009 at 08:57 AM.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
My L98 does not have this mod and I dont plan on doing it. The stock setup doesnt bother me and I like to drive mine in just about any weather condition.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
The lines look more like 3/8" to 5/16" and not 5/8" on the Pass. Side.? Is this more accurate?...In fact I just looked at it again and the Drivers side looks 3/8" but the Pass. side looks like 5/16"/?It is a 95'..
Maybe the earlier models had 3/8" and 5/8" ????
Maybe the earlier models had 3/8" and 5/8" ????
Last edited by CAJUN C4; Apr 20, 2009 at 12:03 PM.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Any comments on the hose sizes? It's definatly Not 5/8". The biggest is 3/8" I Believe.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Done !
Picked up at least 10 HP.
Kidding. Wasn't bad..took about 30 Min. The hose off the engine seems to be about 5/16" or so.3/8" on the other side.
Thanx for your help.
Picked up at least 10 HP.
Kidding. Wasn't bad..took about 30 Min. The hose off the engine seems to be about 5/16" or so.3/8" on the other side.
Thanx for your help.
Drifting
Joined: Nov 2005
Posts: 1,324
Likes: 5
From: Charlotte NC
On my LT, I was able to use the following hoses to eliminate the 'tee'. Makes for a cleaner install. Then get a couple tube caps in the Help! section at the Zone and cap off the open tb tubes. I'm pretty sure the p/n's are NAPA.
NBH9097 - Lower Radiator Hose – Standard 1993 hose. Routes from the lower radiator to thermostat housing.
NBH9096 - Upper Radiator Hose – 1995 LT hose. Eliminates ‘Tee’ to TB. Routes from the upper radiator to the water pump housing.
NBH11743 - Heater Hose – Standard 1993 hose. Upper surge tank outlet to upper heater core inlet at firewall.
NBH11719 - Heater Hose – 1995 LT hose. Routes from the lower surge tank connection to the upper water pump housing.
NBH10729 - Heater Hose – Standard 1993 hose. Routes from the heater flow control valve to the lower water pump housing.
NBH9808 - Heater Hose – Standard 1993 hose. Routes from the lower heater core inlet to the heater flow control valve.
NBH9097 - Lower Radiator Hose – Standard 1993 hose. Routes from the lower radiator to thermostat housing.
NBH9096 - Upper Radiator Hose – 1995 LT hose. Eliminates ‘Tee’ to TB. Routes from the upper radiator to the water pump housing.
NBH11743 - Heater Hose – Standard 1993 hose. Upper surge tank outlet to upper heater core inlet at firewall.
NBH11719 - Heater Hose – 1995 LT hose. Routes from the lower surge tank connection to the upper water pump housing.
NBH10729 - Heater Hose – Standard 1993 hose. Routes from the heater flow control valve to the lower water pump housing.
NBH9808 - Heater Hose – Standard 1993 hose. Routes from the lower heater core inlet to the heater flow control valve.
