Z28 factory cold air not recommended for L99 - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

jshaf · 03-23-2015, 07:22 PM

Quote:

Originally Posted by 31B

Nothing is recommended for L99 :(

GM doesn't want you to have any fun

402 · 03-23-2015, 10:40 PM

To keep this simple as possible, it comes down the transmission. Since the trans operates based on load once you screw with the maf readings, load changes and charaistics of the transmission change. Shirt points, firmness, pressures, etc. Might be noticeable might not be. Tune can fix this worry.

Apharaoh06 · 12-06-2023, 12:02 AM

I know this is an old post. But possibly GM does not recommend it for the L99 due to the DOD. Sometimes the L99 will be running 4 cylinders when cruising, maybe they believe it will be too much air intake for only 4 cylinders sometimes. Probably fine when the L99 is using all 8 cylinders. Just a theory.

el ess A · 12-06-2023, 08:21 AM

Engine is only going to pull in what air it needs. It would be different if it were say, forced induction. But it isn't, so I'm hard pressed to think it would be a problem sucking air in 4-cylinder mode.

It may have something to do with air velocity in whatever sensor/computer algorithm or computations the computer does as the larger intake tube would effectively alter velocity due to the larger diameter which could make a difference in 4-cylinder mode. The development engineers know why for sure, but it may have been more out of an abundance of caution than it just wouldn't work.

Regardless, when they first were available, I bought one, plus a spare filter for the shelf (Camaro parts start disappearing fast from GM), and put it on our 2010 L99 and it works just fine. Glad I got them then, I think I paid about 425 for both from GM at the time with my discount. Now they're almost $700 list price for the kit and over 160 for the replacement filter alone. TBH, the filter looks a lot like a K&N unit. But it does have that little "Z/28" molded on the cap.

No codes, no shift problems, nothing. And the engine is stock as a rock, otherwise. No tune. Just did an oil cooler/heater/whatever delete on it this summer since the little heat exchanger decided to start dripping coolant and oil on the garage floor, but that was just recently and wouldn't have anything to do with the intake anyway.

AlisoBob · 12-06-2023, 11:10 AM

Quote:

Originally Posted by Apharaoh06

I know this is an old post. But possibly GM does not recommend it for the L99 due to the DOD......

Your close..... but it's not aitflow.
The L99 intake has resonators built into it to deal with the annoying "droan" from both the intake and exhaust during DOD operation.

Removing the resonators, is what GM is against......

morepowerjoe · 12-07-2023, 02:58 AM

Come on guys. It has to do with the maf sensor location and tube diameter. When you change that it throughs the fuel trims off.

olblue75 · 12-07-2023, 08:51 AM

Runs fine in my LS3 no tune prior to current build of the motor.

12-06-2023, 08:21 AM	#18
el ess A Older Than Dirt Drives: 2010 & 2013 Camaros Join Date: Apr 2010 Location: Aiken, SC Posts: 4,564	Engine is only going to pull in what air it needs. It would be different if it were say, forced induction. But it isn't, so I'm hard pressed to think it would be a problem sucking air in 4-cylinder mode. It may have something to do with air velocity in whatever sensor/computer algorithm or computations the computer does as the larger intake tube would effectively alter velocity due to the larger diameter which could make a difference in 4-cylinder mode. The development engineers know why for sure, but it may have been more out of an abundance of caution than it just wouldn't work. Regardless, when they first were available, I bought one, plus a spare filter for the shelf (Camaro parts start disappearing fast from GM), and put it on our 2010 L99 and it works just fine. Glad I got them then, I think I paid about 425 for both from GM at the time with my discount. Now they're almost $700 list price for the kit and over 160 for the replacement filter alone. TBH, the filter looks a lot like a K&N unit. But it does have that little "Z/28" molded on the cap. No codes, no shift problems, nothing. And the engine is stock as a rock, otherwise. No tune. Just did an oil cooler/heater/whatever delete on it this summer since the little heat exchanger decided to start dripping coolant and oil on the garage floor, but that was just recently and wouldn't have anything to do with the intake anyway. __________________ 2010 2SS TE, 1 of 822/2013 Camaro ZL1 vert, 1 of 54

12-07-2023, 02:58 AM	#20
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,105	Come on guys. It has to do with the maf sensor location and tube diameter. When you change that it throughs the fuel trims off. __________________ 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

12-07-2023, 08:51 AM	#21
olblue75 Drives: 2010 2SS/RS Join Date: Dec 2009 Location: Clarksville Tennesse. Posts: 6,064	Runs fine in my LS3 no tune prior to current build of the motor. __________________ Orange Krush II 1LE Front sway bar, Splitter, shocks and struts, Z28 dual mode mufflers, Intake, UCA Bushings, and Toresen 3.91 Diff. 1 piece DSS Drive Shaft, ZL1/C7 Calipers, and 32mm JPSS Rear Bar. ASC race spec splitter and wicker. 6th Gen M017 Wheels. Stainless Works 1 7/8 LTs. DSE and PAFDT Suspension components.

03-23-2015, 10:40 PM	#16
402 Drives: Camaro Join Date: Aug 2014 Location: NEB Posts: 242	To keep this simple as possible, it comes down the transmission. Since the trans operates based on load once you screw with the maf readings, load changes and charaistics of the transmission change. Shirt points, firmness, pressures, etc. Might be noticeable might not be. Tune can fix this worry.

12-06-2023, 12:02 AM	#17
Apharaoh06 Drives: 2010 Camaro SS Join Date: Jan 2023 Location: Dallas Posts: 33	I know this is an old post. But possibly GM does not recommend it for the L99 due to the DOD. Sometimes the L99 will be running 4 cylinders when cruising, maybe they believe it will be too much air intake for only 4 cylinders sometimes. Probably fine when the L99 is using all 8 cylinders. Just a theory.