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05-07-2022, 10:12 PM
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#1 | |
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2013 Camaro SS L99 engine sounds
Let me first start out by saying, I'm EXTREMELY paranoid about engine sounds, and I might be listening too much into this, but can someone tell me if they hear anything odd with this sound clip? I did some low revs and some idle.I always think I hear
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05-09-2022, 01:49 AM
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#2 |
       
Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020
Location: Austin, TX
Posts: 2,105
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It sounds like camshaft upgrade to me. One of the lifters is kinda loud but not too loud yet. But unfortunately it will only get worse. How many miles are on it?
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DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer
Build Thread https://www.camaro5.com/forums/showthread.php?t=609817 |
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06-22-2022, 10:33 PM
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#3 |
 
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sounds pretty normal, the loud clicking is the fuel injectors which LS3/L99s are notorious for, that slight clack noise could be an AFM lifter starting to go or it could also be that a header bolt has started to work itself loose. The bolts on my driver side header work themselves loose on a regular basis, apparently its a common thing after they get taken out for a rebuild or repair. I have to go through and re torque them about once a month or they'll work just loose enough that they'll start making a clack noise similar to the sound a bad lifter makes.
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The Mistress: Cam Motion custom VVT grind, shaved heads, R2C intake, Solo mids, 1LE suspension, BMR tunnel brace, GPI tuned, among other bits.
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06-26-2022, 06:10 PM
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#4 |
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376 cubic inches of fun
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I have to disagree about FI noise. The L99 does not have direct injection, so the FI is relatively low pressure and quiet. The noise sounds like either normal valve train noise, a noisy lifter, or perhaps a leaky header gasket, if you have headers.
It always helps to start your question with a description of any mods. Also, did this L99 have the lifters replaced with the upgraded design, per the TSB? |
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06-26-2022, 06:31 PM
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#5 |
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GPI Sales Consultant
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You can clearly hear the (port) injectors happily clicking away louder than just about anything else, which tells me the motor is pretty quiet. Send it.
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GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph.
Got a question about a GPI product? Feel free to shoot me a message!  |
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06-26-2022, 08:16 PM
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#6 |
Drives: 2012 Camaro SS Join Date: Dec 2019
Location: New York
Posts: 1,434
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Just wait till you cam it and install all the hardware lol. Love the sound now but when I first got my car I was paranoid
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2012 Camaro 2SS/RS - CSP Custom Cam 232/240 .615/.615 113 +3, Texas speed CNC heads, FTI billet triple disc converter, K&N cai, Katech ported TB, GPI Ported/rod modded manifold, Texas speed 1 7/8 headers, HFC, Flowmaster 2 chambers with x pipe, Mishimoto CC, MSD wires, Roto fab washer relocation, tru cool 40k trans cooler, apex scoop, Pedders extreme coil overs and much more!!
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