LS3 catless header tune - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

LS3_JC · 03-16-2021, 01:31 AM

I finally decided to pull the trigger on some headers(thanks to my stimmy) I also decided that I would be tuning it myself with hp tuners as it seems pretty doable (correct me if I’m wrong) I’ve been researching the topic for a couple weeks already but I can’t find anything on how to tune for catless header though. Is it just correcting values to stay of the optimum AFR or do I gotta do something extra. Any tuners out there trynna help a beginner?

Avenging Orange · 03-16-2021, 02:20 AM

A couple categories down called - Tuning / Diagnostics- would be a better place to ask this question. HP tuners is a bit more complicated . In you case, a hand held SCT tuner would fit your needs better. You can get a tune from one of our quality sponsors sent to you just for your set up. You can download it and off you go.

Bigdumogre · 03-16-2021, 03:17 AM

Contact dyno Steve and do it right. He will send you a handheld scanner and will write a custom tune for you and it’s easy to download. Best part is his updates are free so whenever you buy something else just data log it with the tool he sends you and send him the file. He has updated my tune 4x already due to that and having a scanner to
Keep is great.

1JEWLDSSRS · 03-16-2021, 09:08 AM

^^^^ this would be your best bet for sure!!! This way it will be done RIGHT and no guess work on your part and maybe mess something up. Just from what I've read on here..

InFiD3ViL · 03-16-2021, 11:57 AM

+1 on using DynoSteve for this type of tune.

Learning HP Tuners would be a great tool to have, but it's not going to happen overnight, no matter how quick you learn. It is a very in-depth and complicated program that can overwhelm even the most technology/mechanically literate among us.

Not trying to discourage you from learning HP Tuners. Just trying to let you know that it is not an easy program to just jump into unless you already have some tuning knowledge and really know what you are doing.

1JEWLDSSRS · 03-16-2021, 03:02 PM

And the fact that when you do any other mods, you can get a FREE tune upgrade from him.. Winner winner!!!

GONIF · 03-16-2021, 03:09 PM

Quote:

Originally Posted by 1JEWLDSSRS

And the fact that when you do any other mods, you can get a FREE tune upgrade from him.. Winner winner!!!

Your best bet over all for sure.

hunter1660 · 03-16-2021, 06:38 PM

You’ll need a wide band gauge to measure fuel/air mixture. That’s what gets adjusted. Catted or Catless on the headers won’t affect the tune, but so as to not trip a CEL the down stream o2 sensors need to be commanded not to report. Search the repository on HPTuners for a tune closest to the mods. You have. There is a compare function that lets you see the different values between a stock tune and the tune you need. Thus enabling you to change your perimeters. There are mentors and having one is a great asset.

03-16-2021, 01:31 AM	#1
LS3_JC Drives: 12’ Chevy camaro SS 6MT Join Date: Jul 2020 Location: Florida Posts: 9	LS3 catless header tune I finally decided to pull the trigger on some headers(thanks to my stimmy) I also decided that I would be tuning it myself with hp tuners as it seems pretty doable (correct me if I’m wrong) I’ve been researching the topic for a couple weeks already but I can’t find anything on how to tune for catless header though. Is it just correcting values to stay of the optimum AFR or do I gotta do something extra. Any tuners out there trynna help a beginner? __________________ haul ass and burn rubber brotha

03-16-2021, 02:20 AM	#2
Avenging Orange Drives: 2010 Inferno Orange 2SS/RS Join Date: Apr 2010 Location: Clermont, IN Posts: 3,297	A couple categories down called - Tuning / Diagnostics- would be a better place to ask this question. HP tuners is a bit more complicated . In you case, a hand held SCT tuner would fit your needs better. You can get a tune from one of our quality sponsors sent to you just for your set up. You can download it and off you go. __________________ 2010 Inferno Orange 2SS/RS M6 Black Leather, Sun Roof, OBX Headers, Borla touring axle back, Cold Air Inductions CAI , non synthetic fluids, BMR total bushing upgrade/1" lowering springs, DSE 32mm rear sway bar. GM fe4 shocks/struts/LCA's, AAM 3.91 diff, Vertini RFS1.8 20x9 +30. Conti ExtremeContact Sport 275/35/20. sjm autoprod ABL dash kit. Mike Norris tuned 413/419. Avenging Orange: 43 years of not buying into the Hype........and damn proud of it!! https://youtu.be/9JD9it6SmB8 https://youtu.be/xmelTlEzI34 KICKING CANCERS ASS SINCE 2015!!

03-16-2021, 03:17 AM	#3
Bigdumogre Drives: 2012 Camaro SS Join Date: Dec 2019 Location: New York Posts: 1,434	Contact dyno Steve and do it right. He will send you a handheld scanner and will write a custom tune for you and it’s easy to download. Best part is his updates are free so whenever you buy something else just data log it with the tool he sends you and send him the file. He has updated my tune 4x already due to that and having a scanner to Keep is great. __________________ 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!!

03-16-2021, 09:08 AM	#4
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,405	^^^^ this would be your best bet for sure!!! This way it will be done RIGHT and no guess work on your part and maybe mess something up. Just from what I've read on here.. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

03-16-2021, 11:57 AM	#5
InFiD3ViL Drives: 2010 CGM 2SS/RS LS3 Swapped A6 Join Date: Sep 2016 Location: Spring Hill, FL Posts: 4,570	+1 on using DynoSteve for this type of tune. Learning HP Tuners would be a great tool to have, but it's not going to happen overnight, no matter how quick you learn. It is a very in-depth and complicated program that can overwhelm even the most technology/mechanically literate among us. Not trying to discourage you from learning HP Tuners. Just trying to let you know that it is not an easy program to just jump into unless you already have some tuning knowledge and really know what you are doing. __________________ 2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) on CamMotion 8620 core, BTR Platinum .660" Dual Spring kit w/titanium retainers, CHE bronze trunnion upgrade, stock heads milled @ .015, Melling HV 10296 oil pump, TSP 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, Stage 2 Ported Throttle Body, Vararam OTR CAI, Mike Norris Gen 2 catch can + GM 1LE clean side separator, 160º thermostat - Megan Racing adjustable coilovers (lowered 1.75"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI

03-16-2021, 03:02 PM	#6
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,405	And the fact that when you do any other mods, you can get a FREE tune upgrade from him.. Winner winner!!! __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

03-16-2021, 06:38 PM	#8
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	You’ll need a wide band gauge to measure fuel/air mixture. That’s what gets adjusted. Catted or Catless on the headers won’t affect the tune, but so as to not trip a CEL the down stream o2 sensors need to be commanded not to report. Search the repository on HPTuners for a tune closest to the mods. You have. There is a compare function that lets you see the different values between a stock tune and the tune you need. Thus enabling you to change your perimeters. There are mentors and having one is a great asset. __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners