**LMR custom exhaust build for C8**
03-30-2020, 08:26 PM
#82
1 We are running stainless brothers mufflers
2 It is a complete 3in stainless steel system with 4in dual tips on each side.
3 No CEL with this setup as they are plugged in
And as for the sound, its hard to tell from the video because the GoPros were placed in different spots from stock to aftermarket. We will get some more footage of it on the dyno so you can hear it rolling through the gears. IMO it sounds 10X better than the factory muffler(when fully open). It sounds more like an exotic V8 with a much smoother sounding exhaust compared to when it had the stock muffler and both valves open it sounded more like a V8 with cut outs or a truck with glass packs. Again, we will get more footage in its current setup, and then see how it sounds with a high flow cat setup. Maybe I am just getting older, and do not like the like an obnoxious exhaust like I might have once liked when I was 18 years old. Also in its current state, when it switches to 4cly mode while on the highway, the exhaust does not sound horrible. We will see how that changes with a set of high flow cats as well. Remember, you can set your car up in Performance mode to keep it in 8cyl mode the entire time if you so chose. Guys, I am hear to get your feed back to make a better product, this is why we do R&D, so do not feel bad if you give me bad or good criticism, I can take it.
2 It is a complete 3in stainless steel system with 4in dual tips on each side.
3 No CEL with this setup as they are plugged in
And as for the sound, its hard to tell from the video because the GoPros were placed in different spots from stock to aftermarket. We will get some more footage of it on the dyno so you can hear it rolling through the gears. IMO it sounds 10X better than the factory muffler(when fully open). It sounds more like an exotic V8 with a much smoother sounding exhaust compared to when it had the stock muffler and both valves open it sounded more like a V8 with cut outs or a truck with glass packs. Again, we will get more footage in its current setup, and then see how it sounds with a high flow cat setup. Maybe I am just getting older, and do not like the like an obnoxious exhaust like I might have once liked when I was 18 years old. Also in its current state, when it switches to 4cly mode while on the highway, the exhaust does not sound horrible. We will see how that changes with a set of high flow cats as well. Remember, you can set your car up in Performance mode to keep it in 8cyl mode the entire time if you so chose. Guys, I am hear to get your feed back to make a better product, this is why we do R&D, so do not feel bad if you give me bad or good criticism, I can take it.
Did you just zip-tie the valves out of the way?
Last edited by RapidC84B; 03-30-2020 at 08:27 PM.
03-30-2020, 08:35 PM
#84
Speaking of the packaging limitations inherent in a mid engine design, a review of the full system that Soul Performance prototyped for the C8 shows a very long design. However, there is no indication whether or not the system's length was actually tuned.
It seems that the best current option is to replace the cats with the Soul Performance sport cat but keep the remainder of the stock system. Hopefully, they will dyno the result to validate the modification's performance.
Obviously, keeping the stock heat shielding or its equivalent is paramount.
I am interested to see what Akrapovic might bring to market. They certainly have all of the requisite design tools at their disposal.
It seems that the best current option is to replace the cats with the Soul Performance sport cat but keep the remainder of the stock system. Hopefully, they will dyno the result to validate the modification's performance.
Obviously, keeping the stock heat shielding or its equivalent is paramount.
I am interested to see what Akrapovic might bring to market. They certainly have all of the requisite design tools at their disposal.
04-02-2020, 08:59 AM
#85
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Current C7 World Record Holder 7.55 @ 184 MPH
Quickest and Fastest GEN5 LT Powered Vehicle
LMR1200HP Supercharged C7 8.84 @ 160
LMR1200HP Twin Turbo C7 9.35@155mph-2014
2 TIME OUTLAW DRAG RADIAL LSX CHAMPION 2008/2010
9.47 ZR1 Corvette-2009
LATE MODEL RACECRAFT
713-466-9900
LateModelRacecraft.com
Too many PMs, please call or email instead, thanks!
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04-02-2020, 11:38 AM
#86
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I notice the gains are in mid range torque (which is good), rather than peak hp where it gained nothing. Could tell us the mode settings for the baseline run and new run. Could some of the difference be due to a closed valve on the stock system that opened at higher rpms, maybe a mode difference between tour and track?
There are so many variables these days. Also I noticed the comparison between 4th and 5th gears showed the same kind of midrange torque difference, but little to no change in peak hp. Given the differential should be due to gearing losses and nothing else, I would have expected there to be differences across the whole rpm range.
maybe I am misreading the data.
There are so many variables these days. Also I noticed the comparison between 4th and 5th gears showed the same kind of midrange torque difference, but little to no change in peak hp. Given the differential should be due to gearing losses and nothing else, I would have expected there to be differences across the whole rpm range.
maybe I am misreading the data.
04-02-2020, 01:15 PM
#87
That sounded fantastic. Is the stock exhaust in track mode? Was the baseline done before break-in?
04-02-2020, 01:50 PM
#88
Le Mans Master
LMR, did I miss the weight savings?
Maybe they are not as much as I was hoping to see?
Maybe they are not as much as I was hoping to see?
04-02-2020, 02:30 PM
#89
05-03-2021, 11:49 AM
#90
Supporting Vendor
Thread Starter
Here is a quick update on our Exhaust system. We do have our Stainless systems in stock and ready to ship. This video shows our new production model Titanium catback exhaust system. We plan to put more miles on it before releasing to the public.