LT4 mods without a tune

drizzit · 07-23-2021, 09:33 AM

What mods can be done in the LT4 without requiring a tune? CAI, headers? Small od% Pulley? Etc

Camaro1973 · 07-23-2021, 09:35 AM

Quote:

Originally Posted by drizzit

What mods can be done in the LT4 without requiring a tune? CAI, headers? Small od% Pulley? Etc

Same size CAI and that’s about it.

Maybe some go fast stickers.

Jaxcam02 · 07-23-2021, 09:39 AM

yea I agree with the above. Too many computer systems on new cars to not get a tune with even headers. You could get away with it on the LS1s but now, its just a requirement when doing anything that deals with the combustion process.

avalonandl · 07-23-2021, 10:01 AM

CAI and thats about it.

CW3SF · 07-23-2021, 10:02 AM

I ran regular Rotofab CAI, Soler ported TB and AWE catback with PLPs and secondary cat delete. Didn’t tune until I added flex fuel and headers.

Mark R · 07-23-2021, 11:12 AM

Quote:

Originally Posted by drizzit

What mods can be done in the LT4 without requiring a tune? CAI, headers? Small od% Pulley? Etc

What the others said. Since you are in California, you should probably leave it stock. Aren't aftermarket exhausts illegal there now?

*radz28* · 07-23-2021, 11:32 AM

If you are looking for real performance improvement, there's not really anything that is guaranteed. It seems to me that there's little room in the OEM to grow much, if any, consistent power above stock. Unless you upgrade to a CARB-legal mod', which would modify and adjust some torque modeling, you could potentially the stock torque management system by driving in cool-dry weather at sea level with a completely stock car.

It seems, to guarantee any improvement, you have to crack the ECM open. And at this time, in CA, when it comes time to smog, they, apparently, can see a non-OEM tune file and fail you. If you're not concerned about that, get a tune and enjoy all the available power all the time, and optimize your set-up.

JMO...

LT4Greg · 07-23-2021, 11:38 AM

Not many mods you can do without a tune except for a CAI and a few other things as others have replied.

*radz28* · 07-23-2021, 11:40 AM

Quote:

Originally Posted by LT4Greg

Not many mods you can do without a tune except for a CAI and a few other things as others have replied.

IF it matters in this discussion - no CARB-legal CAIs I've noticed yet... Again - if it matters in this context

LT4Greg · 07-23-2021, 11:43 AM

It doesn’t stop people from putting them on out in California but what do I know? Doesn’t matter to me anyway as I don’t live there.��

serper3 · 07-23-2021, 11:50 AM

From what I read, in CA, you can tune the but before you smog, you need to put the stock tune back on and drive the car so all the monitors are ready.

It is easy to put a stock intake back on, but if you have a cam or something more difficult to put back to stock, with a stock tune, you will likely get codes and fail regardless of you failing visual.

Camaro1973 · 07-23-2021, 11:52 AM

Quote:

Originally Posted by serper3

From what I read, in CA, you can tune the but before you smog, you need to put the stock tune back on and drive the car so all the monitors are ready.

It is easy to put a stock intake back on, but if you have a cam or something more difficult to put back to stock, with a stock tune, you will likely get codes and fail regardless of you failing visual.

Yeah its new, it popped up on one of my feeds.... What a joke...

Here's a good reminder to anyone running a tuned car out in California: As of today, July 19, the state's notoriously strict smog testing will automatically fail any car when it detects modified software onboard, aka, a tuned ECU.

CamOnlyJabroni · 07-23-2021, 01:42 PM

Certain CAI’s and a ported TB. Made a noticeable difference on my ZL1 and the same when I did it to the C7Z. Both responded well. This is a state where 93octane is available. I wouldn’t do any mods in a 91 octane state unless it could be tuned. Too easy for these engines to detonate on lower grade fuels.

AZIROC · 07-23-2021, 01:54 PM

From whats I've seen and done, axle/cat back exhaust (as long as you keep both sets of cats), ported stock TB, and a CAI (as long as it not a big gulp or any other 5" CAI).

07-23-2021, 09:33 AM	#1
drizzit Drives: 2011 Camaro SS 2,200HP Join Date: Jul 2021 Location: Ontario, CA Posts: 12	LT4 mods without a tune What mods can be done in the LT4 without requiring a tune? CAI, headers? Small od% Pulley? Etc

07-23-2021, 09:39 AM	#3
Jaxcam02 Drives: 2017 Silverado/2017 ZL1 Join Date: Aug 2019 Location: Jax/Palatka FL Posts: 1,090	yea I agree with the above. Too many computer systems on new cars to not get a tune with even headers. You could get away with it on the LS1s but now, its just a requirement when doing anything that deals with the combustion process. __________________

07-23-2021, 10:01 AM	#4
avalonandl Drives: 2019 ZL-1 Join Date: Feb 2009 Location: Troy, MI & Naples, FL Posts: 2,019	CAI and thats about it. __________________ 2019 ZL-1 Acquired 4/23/21 at 6300 miles. Riverside Blue, A10, PDR. Traded in 2017 2SS with 6M and 32k miles. Continental Extreme Contact Sports. Now has 10,000 miles... 2012 Yukon XL Denali w/ 6.2 AWD

07-23-2021, 10:02 AM	#5
CW3SF Drives: 2019 Chevy Camaro ZL1 M6 Join Date: Jul 2019 Location: Sea level Posts: 1,252 View My Garage	I ran regular Rotofab CAI, Soler ported TB and AWE catback with PLPs and secondary cat delete. Didn’t tune until I added flex fuel and headers. __________________ Kong Stage X Port, NW103, LPE HPFP, XDI +30 Injectors, ARH Headers, Flex Fuel, JMS Booster, AWE Touring, Elite E2-X CC. Stock heads, stock cam, stock pulleys: Tuned by KingLT1. 740whp Uncorrected on e50

07-23-2021, 11:32 AM	#7
radz28 Petro-sexual Drives: Ultra-Grin Join Date: Oct 2006 Location: Crazy Coast Posts: 15,201 View My Garage	If you are looking for real performance improvement, there's not really anything that is guaranteed. It seems to me that there's little room in the OEM to grow much, if any, consistent power above stock. Unless you upgrade to a CARB-legal mod', which would modify and adjust some torque modeling, you could potentially the stock torque management system by driving in cool-dry weather at sea level with a completely stock car. It seems, to guarantee any improvement, you have to crack the ECM open. And at this time, in CA, when it comes time to smog, they, apparently, can see a non-OEM tune file and fail you. If you're not concerned about that, get a tune and enjoy all the available power all the time, and optimize your set-up. JMO... __________________ '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

07-23-2021, 11:38 AM	#8
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	Not many mods you can do without a tune except for a CAI and a few other things as others have replied. __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

07-23-2021, 11:43 AM	#10
LT4Greg Drives: 2017 Camaro ZL1 Coupe Join Date: May 2016 Location: Georgia Posts: 5,813	It doesn’t stop people from putting them on out in California but what do I know? Doesn’t matter to me anyway as I don’t live there.�� __________________ ZL1 Coupe, PDR, Exposed carbon fiber hood insert, My Link with Nav, M6 6 speed and Silver Ice Metallic. Mods done: ceramic window tint, GM Accessories Camaro floor mats and Roto-Fab CAI.

07-23-2021, 11:50 AM	#11
serper3 Drives: 2018 Camaro ZL1 1LE Join Date: Mar 2021 Location: Bay Area, CA Posts: 288	From what I read, in CA, you can tune the but before you smog, you need to put the stock tune back on and drive the car so all the monitors are ready. It is easy to put a stock intake back on, but if you have a cam or something more difficult to put back to stock, with a stock tune, you will likely get codes and fail regardless of you failing visual.

07-23-2021, 01:42 PM	#13
CamOnlyJabroni Drives: 19’ ZL1 A10 / 16’ C7Z M7 Join Date: Apr 2021 Location: Fort Wayne, IN Posts: 247	Certain CAI’s and a ported TB. Made a noticeable difference on my ZL1 and the same when I did it to the C7Z. Both responded well. This is a state where 93octane is available. I wouldn’t do any mods in a 91 octane state unless it could be tuned. Too easy for these engines to detonate on lower grade fuels.

07-23-2021, 01:54 PM	#14
AZIROC Drives: '86 IROC-Z '18 ZL1 Join Date: Jul 2019 Location: Arizona Posts: 734	From whats I've seen and done, axle/cat back exhaust (as long as you keep both sets of cats), ported stock TB, and a CAI (as long as it not a big gulp or any other 5" CAI).

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