Question about L99 with Aftermarket Cylinder Heads - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Hallwj · 07-05-2015, 01:56 PM

I would like to know some of your guys opinions on compression ratios for L99's with Aftermarket heads. I have a set of TFS Gen X 255's being worked by Tony Mamo as we speak. I will be running 93 octane pump gas. I have confidence in my tuner but want to stay in a "safe zone" with the increased comppression.

LSX Camaro · 07-05-2015, 03:29 PM

How much are increasing the compression?

Unreal · 07-05-2015, 03:41 PM

Also depends on cam choice. Dynamic compression plays a huge roll.

I've seen plenty of LS cars run 11.5-12.0. They just may take a bit less timing. I think 11.5-11.8 is a good range for NA compression.

flyer08 · 07-05-2015, 05:27 PM

Have ls3 heads done by lpe at 11.4

Hallwj · 07-05-2015, 05:48 PM

11.5 is what was suggested. I will be running a mid-size vvt cam not definite on specs yet. I'm thinking 11.5:1 may be a little too aggressive on the street running pump gas. I was just curious as to what other members are running.

Unreal · 07-05-2015, 06:18 PM

11.5 is fine with pump gas.

62nalide · 07-05-2015, 07:08 PM

I'm 11.5:1 on 93 pump gas even a buddy runs 12.5:1 on pump 93 on his

flyer08 · 07-05-2015, 10:49 PM

Should have listed more info. 11.4 on 93 pump with tsp vvt2 cam which is pretty mild i believe.

07-05-2015, 01:56 PM	#1
Hallwj Drives: 2010 SIM 2SS/RS Join Date: Aug 2014 Location: United States Posts: 6	Question about L99 with Aftermarket Cylinder Heads I would like to know some of your guys opinions on compression ratios for L99's with Aftermarket heads. I have a set of TFS Gen X 255's being worked by Tony Mamo as we speak. I will be running 93 octane pump gas. I have confidence in my tuner but want to stay in a "safe zone" with the increased comppression. __________________ CAI intake, TSP long tubes, custom exhaust, 1LE gears, tuned by Greg's Tunning Operation.

07-05-2015, 03:29 PM	#2
LSX Camaro Master ASE, GM, LSX Tech. Drives: 2010 Camaro SS Join Date: Oct 2012 Location: Austin, TX Posts: 1,034	How much are increasing the compression? __________________ 2010 2SSRS A6, Custom Pat G. Cam, WCCH Cylinder Heads, Kooks Headers/Exhaust, BTR Valvetrain, Fluidampr 25% UDP, All Engine ARP bolts, Flex-a-lite radiator/Trans cooler, Yank converter, PFADT Suspension, ADM Race Intake/Scoop, Torq tow hook, CFD auto shifter, Dynojet AFR gauge, Aeroforce scan gauge, Brake Performance rotors/pads Prothane bushings, ZL1 wheels, spoiler, Z/28 wickerbill, 1LE Aero/Suspension Package, Anderson Composites COPO Carbon Fiber Hood, LED lighting, Elite Catch Can, Improved Racing oil pan baffle, crank scraper, windage tray 480 RWHP 452 RWTQ + Nitrous Express 150 Shot

07-05-2015, 03:41 PM	#3
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	Also depends on cam choice. Dynamic compression plays a huge roll. I've seen plenty of LS cars run 11.5-12.0. They just may take a bit less timing. I think 11.5-11.8 is a good range for NA compression. __________________ Nick Corvette Z06 -1200ish rwhp

07-05-2015, 05:48 PM	#5
Hallwj Drives: 2010 SIM 2SS/RS Join Date: Aug 2014 Location: United States Posts: 6	11.5 is what was suggested. I will be running a mid-size vvt cam not definite on specs yet. I'm thinking 11.5:1 may be a little too aggressive on the street running pump gas. I was just curious as to what other members are running. __________________ CAI intake, TSP long tubes, custom exhaust, 1LE gears, tuned by Greg's Tunning Operation.

07-05-2015, 06:18 PM	#6
Unreal Drives: 2006 Z06 Join Date: Oct 2010 Location: Gilbert, AZ Posts: 5,712	11.5 is fine with pump gas. __________________ Nick Corvette Z06 -1200ish rwhp

07-05-2015, 05:27 PM	#4
flyer08 Account Suspended Drives: 2010 2SS/RS Join Date: Jun 2009 Location: Texas Posts: 3,418	Have ls3 heads done by lpe at 11.4

07-05-2015, 07:08 PM	#7
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	I'm 11.5:1 on 93 pump gas even a buddy runs 12.5:1 on pump 93 on his __________________ https://frankensteined.net/ Martin@Frankensteined.net

07-05-2015, 10:49 PM	#8
flyer08 Account Suspended Drives: 2010 2SS/RS Join Date: Jun 2009 Location: Texas Posts: 3,418	Should have listed more info. 11.4 on 93 pump with tsp vvt2 cam which is pretty mild i believe.