04-16-2021, 11:05 AM | #15 |
Drives: '18 ZL1 1LE Join Date: May 2020
Location: KY
Posts: 219
|
I'd have to hook up HPTuners and take a look, but on my ZLE in stealth mode it seems like above 4500-5000 rpm it gets noisy so I'm assuming that's the valves opening. It purrs like a kitten until that point. This is at WOT from like 2K.
__________________
2018 ZL1 1LE - Summit White, PDR, Rotofab CAI, 95mm TB, CSP 2" catless LT's, JMS Voltage Booster, AEM X-series WB, DSX flex fuel sensor, Banks Data Monster, Tuned by Ted Jannetty, 5% Tint, Blackvue DR900S-2CH, Diode Dynamics lighting, IGL Kenzo ceramic coating
|
04-16-2021, 11:54 AM | #16 |
Geoff
Drives: 2020 ZL1 Green Join Date: May 2013
Location: Houston
Posts: 1,720
|
OP look at adding a "resonator" in each pipe upstream of the stock muffler. That should knock out the higher frequencies and tone it down. Speculation here, I don't think you'll lose any noticeable power
__________________
|
04-16-2021, 12:13 PM | #17 |
Petro-sexual
|
Stealth mode, if I recall, did open (similarly in Tour mode), after a certain RPM. I think the RPM thresholds were slightly different, but using King's method helped me tune the exhaust pretty much exactly how I want it. I still have it open after certain thresholds, but they open slightly more and earlier than stock now.
__________________
'20 ZL1 Black "Fury" A10, PDR, Exposed CF Extractor Magnuson Magnum DI TVS2650R // RFBG // Soler 103 // TooHighPSI Port Injection // THPSI Billet Lid // FF // Katech Drop-In // PLM Heat Exchanger // ZLE Cradle bushings // BMR Chassis-Suspension Stuff // aFe Bars // Diode Dynamics LEDs // ACS Composites Guards // CF Dash // Aeroforce // tint // other stuffs |
04-16-2021, 12:41 PM | #18 |
Drives: 2019 ZL1 1LE Join Date: Feb 2017
Location: Gilbert, AZ
Posts: 648
|
I used to have an SS 1LE, even in stealth mode if you get near WOT it'll open the valves.
__________________
Old: 2017 SS 1LE
Old: 2017 ZL1 Current: 2019 ZL1 1LE |
04-16-2021, 01:26 PM | #19 | |
Drives: 2019 ZL1 Join Date: Mar 2019
Location: NJ
Posts: 1,534
|
Quote:
In stealth mode, they will still open. I forgot what rpm but its there.
__________________
928rwhp - 93 | 1040rwhp/898rwrq - E65 SAE
LME 377 LT4 Short Block | Magnuson 2650 80mm upper w/13% lower (9.06) | DSX Lid & Valve Covers | CSP Custom Cam w/32% fuel lobe | CID Heads | NW 103mm TB | Roto Fab Big Gulp | CSP 2" Headers w/Green GESI Gen 2 Cats | Borla 3" Full Cat Back w/ S-Type| Mighty Mouse Wild Catch Can| Custom Holley Low side Fuel system| TooHigh PSI Port Injection w/Holley Controller | Forced Inductions Interchiller w/2 gallon fender tank | TK Performance built 10L90 |
|
04-16-2021, 02:47 PM | #20 |
Drives: 17 SS 1LE Join Date: Dec 2015
Location: Houston
Posts: 1,920
|
There was a thread on the Magnaflow resonated x-pipe a few months ago. People seemed to be happy with the results.
|
04-16-2021, 04:05 PM | #21 |
Drives: ZL1 1LE Join Date: Jul 2020
Location: MA
Posts: 46
|
Welp looks like I'm not bringing this car to that track any more... that blows. I don't want to modify the exhaust. The current setup is perfect.
Thanks for the heads up about keeping the exhaust valves closed, figured there might be a backpressure issue (bulged exhaust) or something like that but nothing like the photo posted |
04-16-2021, 05:23 PM | #22 | |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
Posts: 6,800
|
Quote:
__________________
2016 NFG 1SS A8
Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA |
|
|
|
Post Reply
|
|
|