Poll: LT Headers with hi flow's WILL definitely cause your car to run rich - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

jordan 572 · 09-30-2011, 07:30 AM

Quote:

Originally Posted by Raptor626

If something's on your mind you can go ahead and say it. If you wanna make a bitch ass comment like that then I suggest you don't comment at all.

Rhino79 · 09-30-2011, 08:54 AM

Some of the smell is probably because of the hi-flow cats, sure they work, but they can't work as well as 4 factory garbage can cats with smell and emissions. Jannetty did a header test and the car was untuned if I recall correctly and the afr's were high 11's to low 12's on all the pulls.

Would I tune it afterwards, yes. Do you have to? Probably varies from one car to the next.

Ratt · 09-30-2011, 05:06 PM

I have headers and no tune and the car runs rich. The new Camaros run a little rich totally stock. The VMAX throttle body helps but I need a tune soon.

Stickboy · 09-30-2011, 05:50 PM

P1133 and P1153 will cause a MIL if not turned off with a tune... and they are for the pre-cat sensors so the answer is yes you will get a MIL without a tune.

kmcd · 10-02-2011, 01:12 PM

Quote:

Originally Posted by jrhaus76

This topic has been beaten to almost to death, only reason they kept it alive is to beat OT again... and again... and again.

If you get headers... GET A F-ING TUNE!

bluetorp · 10-03-2011, 05:26 AM

Narrowband O2 sensors are extremely temperature sensitive. When you move the O2s from the manifold locations close to the exhaust ports down to the collectors on a set of long tubes, you inadvertently change what the sensor reads as stoichiometric because of the change in the operating temperature of the sensor. The PCM still commands what it thinks is 14.7, but because the sensor readings have changed the actual AFR is going to be off to a greater or lesser extent.

With a tune you can compensate for the changed O2 locations and resulting operating temperature by, for example, changing the rich/lean swing points of the sensors.

Parag · 10-03-2011, 07:08 PM

i put in cam, ported heads, catless LT's, and muffler delete at same time, i was running lean enough to throw a lean code at idle and low rev, and rich over 2000.

so basically, just get a real tune, its hard to try to do it yourself with crappy handheld tuners.

View Poll Results: Will Long Tube headers + hi flow cats + NO TUNE=Run rich + codes?
YES	39	72.22%
NO	15	27.78%
Voters: 54. You may not vote on this poll

09-30-2011, 05:50 PM	#18
Stickboy Drives: 2010 Camaro 1SS Join Date: Dec 2009 Location: Victoria Posts: 108	P1133 and P1153 will cause a MIL if not turned off with a tune... and they are for the pre-cat sensors so the answer is yes you will get a MIL without a tune. __________________ 2010 Camaro 1SS H&R Sport Springs XSPower Full Exhaust Hi-Flo Cats K&N CAI 5252motorsport Custom Dyno Tune 435hp/434ft-lbs

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09-30-2011, 08:54 AM	#16
Rhino79 Drives: 2010 Camaro SS L99/Auto Join Date: Jul 2011 Location: Cabot, AR Posts: 2,827 View My Garage	Some of the smell is probably because of the hi-flow cats, sure they work, but they can't work as well as 4 factory garbage can cats with smell and emissions. Jannetty did a header test and the car was untuned if I recall correctly and the afr's were high 11's to low 12's on all the pulls. Would I tune it afterwards, yes. Do you have to? Probably varies from one car to the next.

09-30-2011, 05:06 PM	#17
Ratt Account Suspended Drives: 2ss Join Date: Sep 2011 Location: Illinois Posts: 199	I have headers and no tune and the car runs rich. The new Camaros run a little rich totally stock. The VMAX throttle body helps but I need a tune soon.

10-03-2011, 05:26 AM	#20
bluetorp Drives: 2010 2SS/RS IOM M6 Join Date: May 2011 Location: Abu Dhabi, UAE Posts: 288	Narrowband O2 sensors are extremely temperature sensitive. When you move the O2s from the manifold locations close to the exhaust ports down to the collectors on a set of long tubes, you inadvertently change what the sensor reads as stoichiometric because of the change in the operating temperature of the sensor. The PCM still commands what it thinks is 14.7, but because the sensor readings have changed the actual AFR is going to be off to a greater or lesser extent. With a tune you can compensate for the changed O2 locations and resulting operating temperature by, for example, changing the rich/lean swing points of the sensors.

10-03-2011, 07:08 PM	#21
Parag Drives: 2010 camaro 2SS LS3 Join Date: Aug 2011 Location: Denver Posts: 1,334	i put in cam, ported heads, catless LT's, and muffler delete at same time, i was running lean enough to throw a lean code at idle and low rev, and rich over 2000. so basically, just get a real tune, its hard to try to do it yourself with crappy handheld tuners.