Exhaust heat after fi swap - Team Camaro Tech
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post #1 of 11 (permalink) Old Mar 6th, 16, 03:48 PM Thread Starter
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Exhaust heat after fi swap

For those of you that have gone from a carb to an aftermarket FI sytem...

Have you noticed that your exhaust is running significantly hotter...?

I have recently installed a Holley Terminator system on my SBC 400. It replaced a 950 cfm ProSystems carb.

Engine specs:

Dart SHP block
AFR 210 ELIMINATOR
EDELBROCK PERFORMER rpm
STRAUB ROLLER
dur @ .50 231/238
lift 576/569
108 lope sep

Computer controls all timing events
25*initial
34*WOT
40* cruise

Air/Fuel ratio are

12.8 at WOT
14 at cruise

I have noticed significantly more exhaust heat since the swap. I realize that the system is still learning... but damn... I can smell the "hotness". I can feel in coming through the floor..when before it was not noticeable. It has kinda messed up the shiny coating on my Dynatech headers...

The plugs are a nice tan color with no melting or deposits. Way cleaner than the carb plugs. No exhaust residue on the concrete under exhaust..


Appreciate any feedback..

Kip
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post #2 of 11 (permalink) Old Mar 6th, 16, 04:59 PM
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Re: Exhaust heat after fi swap

The engine being fueled by EFI, a leaner mixture than being carb'd, is making the exhaust hotter.

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post #3 of 11 (permalink) Old Mar 6th, 16, 05:24 PM
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Re: Exhaust heat after fi swap

I'd have o agree... lean (hotter) burn.

Mine was pretty unbearable on a 95*+ day, but now with an AFR meter and a better tune (still carb'ed) I can say it's a lot better....almost unnoticeable heat.

Idle in the 13 range once fully warmed up....but your numbers look right
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68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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post #4 of 11 (permalink) Old Mar 6th, 16, 05:58 PM Thread Starter
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Re: Exhaust heat after fi swap

YUP... I am kinda stumped.... It was only 70* today... and my leg was hot... It would be miserable in the summer....

My carb is looking real good about now...!

Guess I will call Holley tomorrow....
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post #5 of 11 (permalink) Old Mar 7th, 16, 02:42 AM
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Re: Exhaust heat after fi swap

How was the coolant temp ?
Notice any change ?

68 Camaro~LSx ~all motor
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post #6 of 11 (permalink) Old Mar 7th, 16, 07:58 AM Thread Starter
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Re: Exhaust heat after fi swap

coolant temp is the same.....
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post #7 of 11 (permalink) Old Mar 7th, 16, 04:54 PM
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Re: Exhaust heat after fi swap

Wow that is something I had not thought of. Mine is unbearable now with a carb.
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post #8 of 11 (permalink) Old Mar 8th, 16, 08:23 AM Thread Starter
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Re: Exhaust heat after fi swap

I was toying with the idea of trying a different fuel map... one that is "fatter" overall....
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post #9 of 11 (permalink) Old Mar 8th, 16, 12:41 PM
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Re: Exhaust heat after fi swap

Just remember, those numbers are NOT set in stone. They can not account for every brand/blend on the market

68 Camaro~LSx ~all motor
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post #10 of 11 (permalink) Old Mar 12th, 16, 05:04 PM
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Re: Exhaust heat after fi swap

Your numbers really don't look that bad. I'm pretty sure 14.7 is optimal and is what the OBD II generation is set at.

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post #11 of 11 (permalink) Old Mar 13th, 16, 07:46 AM
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Re: Exhaust heat after fi swap

Your numbers are good. Better running more effeciient and more heat.

I would leave it alone and install some heat shielding

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