Question on the thottle body heat bypass - Chevy SSR Forum
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post #1 of 10 (permalink) Old 05-18-2017, 02:05 PM Thread Starter
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Question on the thottle body heat bypass

I was dropping off one of my Mercedes today to my mechanic and was telling her (yes, her) about a few things I did yesterday to my R, including the throttle body heat bypass. She looked puzzled as I told her, per the forum, that the TB runs cooler and better performance with this done (per the tutorial). She said that the reason for coolant transfer at the TB is to draw heat FROM the TB! ?? Thoughts?? Before you discredit her because she is a her she works on lots of high end European cars and is very good (and darn cute also).
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post #2 of 10 (permalink) Old 05-18-2017, 02:25 PM
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The throttle body shouldn't be hot, pumping 200+ degree water through it will not make it cooler. The reason for the water going through there is to heat the throttle body faster on start up, especially in winter, to improve cold start emissions.
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post #3 of 10 (permalink) Old 05-18-2017, 02:40 PM
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JK Bruce is correct, the coolant line is there due to northern climates to warm up the throttle body and keep ice from forming and emissions. I did do it to mine too but just because I had nothing better to do that day and I polished some stuff in the area.

You will not really see any change in performance, but like adding foam around the intake filter area, cooler intake air is always a/ nice idea.


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post #4 of 10 (permalink) Old 05-18-2017, 02:41 PM Thread Starter
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ok but if a cold start would not the coolant be cool and not warm/hot? Would not by the time the coolant is up to temp so is the rest of the engine??
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post #5 of 10 (permalink) Old 05-18-2017, 02:49 PM
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Emissions?

You are correct, it would be cool. However, it will is not very cold, and will heat up soon.

I have had these on other older tractors. They work, however I think that they were mainly to help with pollution on the SSR. Does it cause trouble on the Cali emissions test?

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post #6 of 10 (permalink) Old 05-18-2017, 02:54 PM Thread Starter
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should we hook it back up during winter months? Not that cold here in GA but it can be in the 30's and if any colder I am not driving the R anywhere anyway!
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post #7 of 10 (permalink) Old 05-18-2017, 04:22 PM
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Looks like Lingenfelter believes this ia a good idea

Thank you for purchasing the Lingenfelter Performance Engineering (LPE) LS1/LS6 throttle body coolant bypass kit. This kit is designed for use on any vehicle with an Original Equipment Manufacturer (OEM) LS1 or LS6 throttle body. This kit reroutes the engine coolant away from the throttle body, reducing the temperature of the air flowing through the air intake.
Read the entire instruction manual before beginning installation. Some stock parts will be used in reassembly.
This kit is required for the installation of the LPE 90mm 4 bolt C5 Corvette throttle body (PN: L270010197).
In designing the LS1/LS6 throttle body, GM chose to run the engine coolant through the throttle body in order to reduce the chance of the throttle body icing over in extremely cold weather. If the vehicle might be driven in temperatures approaching 32 degrees Fahrenheit or below, it may be necessary to keep the engine coolant running through the throttle body until the temperature of the operating environment increases.
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post #8 of 10 (permalink) Old 05-18-2017, 07:45 PM
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I disagree, if it's necessary why didn't GM put it on the LS-2. It's about emissions. Where is all this moisture coming from at 32 degrees? Once the engine&compartment warm up the Throttle Body does too. If Lingenfelter sells a replacement item it must meet the same federal requirements as the original part or be marked "off road use only". So they do it and when it defies logic they blame GM.

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post #9 of 10 (permalink) Old 05-18-2017, 08:03 PM
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It was for emmisions. Someone explained it to me last year but I don't remember the details. Had something to do with inlet air temp telling the ecu to lean or richen the fuel/ air ratio. The 6.0 has a totally different top end and more efficient engine control than the 5.3.
I'll ask autoprof tomorrow. He's at Maggie.
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post #10 of 10 (permalink) Old 05-18-2017, 08:31 PM
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Originally Posted by cali201 View Post
should we hook it back up during winter months? Not that cold here in GA but it can be in the 30's and if any colder I am not driving the R anywhere anyway!
By-pass it and leave it alone, as it was for emissions only. GM has done this with other engines in the past and every time I deleted the heating system, the vehicle would run better. In the old days they put heater units under the carbarators to warm them and then pass fuel over it.
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