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post #1 of 7 (permalink) Old 04-29-2018, 12:44 PM Thread Starter
FOXBAT
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Dreaded Heat

Has anyone heat wrapped the entire exhaust?

I just got through wrapping the rear section that embraces the trans and rearend.

Many thanks in advance.

--FOXBAT

2017 C7 Grand Sport. No picture yet of this beast in action.
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post #2 of 7 (permalink) Old 04-29-2018, 05:23 PM
racingvette
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Re: Dreaded Heat

One issue is welds of the exhaust, they are thicker then the pipe
By trapping in the heat, the 2 metals change to temps at a different rate and can cause welds to crack

Another is by trapping the heat into pipes can have ill effects to the O2 sensors and CATs

Mike M - 2001 / 2008 Z06s
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post #3 of 7 (permalink) Old 05-01-2018, 05:56 AM Thread Starter
FOXBAT
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Re: Dreaded Heat

Thank you for voicing your concerns. I truly appreciate them.

However, I find the weld issue rather specious, especially given all the welded and wrapped motorcycle pipes out on the road.

As for the CATs, I do not intend on wrapping them, only their surrounding pipe. If anything, the increased heat and resultant flow should make them more efficient.

Now for the O2 sensors. Your concern is a distinct possibility, but in all my years of racing never have I confronted that.

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post #4 of 7 (permalink) Old 05-01-2018, 11:24 AM
racingvette
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Re: Dreaded Heat

Exhaust for a 427 CI LS7, collective per side is 800-1,000 degrees per side, much more hotter then short exhaust of a motorcycle

Well proven that wrapping will cause a higher expansion rate of the thin pipe then the thicker weld
Also went cooling the trapped heat causing condensation which then effects welds.

Makes no difference if the CATs are wrapped, it is the facts the hotter trapped heat of exhaust will effect all 4 O2 sensors
which then cause the PCM to falsely command fuel injector ON times

Now with hotter temps as the math of PCM is done by what the O2s reports, trips the CAT overtemp function and injects more excess fuel in to attempt to protect the CATs to cool them down, which effects performance of engine.

Use of larger volume radiator, water/methanol, engine oil, tranny and transaxle coolers, along with venting hood will reduce overall temps.

Example below of what headers look like when wrapped and cracked weld.

Quote:
Originally Posted by FOXBAT View Post
Thank you for voicing your concerns. I truly appreciate them.

However, I find the weld issue rather specious, especially given all the welded and wrapped motorcycle pipes out on the road.

As for the CATs, I do not intend on wrapping them, only their surrounding pipe. If anything, the increased heat and resultant flow should make them more efficient.

Now for the O2 sensors. Your concern is a distinct possibility, but in all my years of racing never have I confronted that.
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Mike M - 2001 / 2008 Z06s

Last edited by racingvette; 05-01-2018 at 11:27 AM.
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post #5 of 7 (permalink) Old 05-01-2018, 04:08 PM Thread Starter
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Re: Dreaded Heat

Thank you again for your input and visual evidence.

Firstly, my vehicle is not a 427 with racing headers. It is a lowly LT1, naturally aspirated, car. Does it get hot, for sure, and I intend to shortly address the issue.

I would fully agree with you that light-weight racing headers might be susceptible at the welds, but even then, in my experience, I have never seen such evidence.

But again, thank you for your opinion. You raised some interesting issues.

--FOXBAT

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post #6 of 7 (permalink) Old 05-03-2018, 04:19 PM
Z06 Time
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Re: Dreaded Heat

I put a heat shielded heavy duty 3/8 thick tunnel plate with Thermal ABS cover to keep the heat out of my console and stiffen the chassis. I heat wrapped the rear like you did. The only other wrap I did was on the passenger side down tubes to protect the starter wiring and the wiring harness and battery from heat. Its a race car but the starter area is fragile on any C5 when headers are added.
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post #7 of 7 (permalink) Old 05-03-2018, 04:30 PM Thread Starter
FOXBAT
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Re: Dreaded Heat

Dear Z06 Time:

Heat wrapping near the starter is a great idea.

I will be doing the same shortly once the weather here in Colorado cooperates.

--FOXBAT

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