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Chips Enthusiast

Chips

Posted
Posted
On 4/28/2019 at 2:00 PM, destrada127 said:

Wow! $4k for a little sound and better flow just to be choked back down by cats. I'd rather spend that plus 2 more on a supercharger

Sent from my SM-G975U1 using Tapatalk
 

Long tubes bypass the factory cats , normally you run them catless and tune out the sensors, they offer Y pipe with cats but it defeats the purpose a bit.

 

On 8/30/2020 at 11:47 AM, calgator73 said:

Has anyone added the kooks headers with ultra green y-pipe and not tuned?  love to see the dyno results.

You would still Likely get a cel and need a tune , the long tube headers are much longer than stock , once adding the new Y pipe the cats are much further back than stock configuration, requiring O2 extensions , cats use heat To function and the further back Cats are the more likely they wont function efficient enough.

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Daly
Daly

You really are just a lonely old man that has to have an opinion on everything aren't you. I'm going to start calling you Ken from now on.   So headers only net you 15hp for $1500, and? 

Daly
Daly

Definitely the word Ken   Still nobody cares...

Grumpy Bear
Grumpy Bear

Couldn't be more relevant. Those lower numbers are also at WOT. To get that 'additional' power you actually have to ask for it with the loud pedal. If it made power based only on rpm then you could no

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calgator73 Senior Enthusiast

calgator73

Posted
Posted

I posted this after I heard back from Kooks...I'm hitting them back up for a dyno sheet today.

 

 

calgator73 Senior Enthusiast

calgator73

Posted
Posted
9 hours ago, Chips said:

Ive been kicking the tires on these once they are stock I may pull the trigger.

 

https://pertronixbrands.com/products/jba-performance-exhaust-1850s-5-1-5-8-header-shorty-stainless-steel-2019-2020-chevy-gmc-1500-5-3-6-2l-l82-l84-l87?variant=31797186232356

 

They bolt up to the factory Y pipe and cats.

I don't know how much of an advantage running shorties through the factory cats would provide.  Easy way to avoid a CEL though.

Chips Enthusiast

Chips

Posted
Posted
1 hour ago, calgator73 said:

I don't know how much of an advantage running shorties through the factory cats would provide.  Easy way to avoid a CEL though.

It changes the exhaust note a fair bit, deeper meaner sound.

 

Also

 

87BF0B1A-24FD-4B67-A1FA-9172FACF1EF6.jpeg

calgator73 Senior Enthusiast

calgator73

Posted
Posted

They are using the same term "gains" as kooks.  Really need to see the dyno.  Having a difficult time finding anyone who has run any of this without a tune.

Chips Enthusiast

Chips

Posted
Posted
9 hours ago, calgator73 said:

They are using the same term "gains" as kooks.  Really need to see the dyno.  Having a difficult time finding anyone who has run any of this without a tune.

Afe has shorties for these trucks and Dyno sheets posted. long tube require a tune no matter what. But ive seen a few shortys on the silverado 1500 without a tune.

 

Note “Gains” vs “peak”.

 

Gains are taking from a dyno run where the highest delta is. Peak is taken from where the peak power is generated.


If at 4000 RPM the difference is 15 HP between Headers and no headers but one peaks at 290 and the other 280. The gains are 15 HP but the peak Increase is 10hp increase.

See attached Dyno sheet for comparison of stock vs shorty headers.

92396DFC-4C46-45C0-B0EC-ABD723438F3B.png

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calgator73 Senior Enthusiast

calgator73

Posted
Posted
9 hours ago, Chips said:

Afe has shorties for these trucks and Dyno sheets posted. long tube require a tune no matter what. But ive seen a few shortys on the silverado 1500 without a tune.

 

Note “Gains” vs “peak”.

 

Gains are taking from a dyno run where the highest delta is. Peak is taken from where the peak power is generated.


If at 4000 RPM the difference is 15 HP between Headers and no headers but one peaks at 290 and the other 280. The gains are 15 HP but the peak Increase is 10hp increase.

See attached Dyno sheet for comparison of stock vs shorty headers.

92396DFC-4C46-45C0-B0EC-ABD723438F3B.png

Thanks for posting this.  I have always been of the same thought.  Shorties/mids no tune required but long tubes definitely.  Thought it had more to do with the cats being so far back and getting cold or something.  Looks like my truck will be done today and they extended my warranty for the powertrain.  This will be put off for a bit.

IrritableVet Enthusiast

IrritableVet

Posted
Posted (edited)

This whole needing to tune on headers isn't completely accurate. I ran my full stainless works setup with defoulers and worked fine. BUT. A tune will greatly aid and while 1400 for unlocked ecm plus headers seems a little steep you gotta pay to play. 

 

Now while I run my procharged setup on my 2020 5.3. I am waiting on seeing if someone makes a 2 inch primary setup for when the LT1 416ci goes in when i have the P1 swapped to my F1 blower. She's gonna need it. 

 

But for all intensive purposes. There are far more people running headers with no tune and no cell than most really know about. 

 

Edited by IrritableVet
Updated
Chips Enthusiast

Chips

Posted
Posted
2 hours ago, Gangly said:

You can run long tubes without a tune, but you benefit the most with a tune. 

You can but the tune is to tune out the cel, sure some run defoulers but they dont always work .

Gangly Senior Enthusiast

Gangly

Posted
Posted

I haven't seen any Long Tube header systems throw a CEL unless they removed the cats entirely as opposed to simply moving them downstream in conjunction with 02 extensions, or installing high flow cats.  

IrritableVet Enthusiast

IrritableVet

Posted
Posted (edited)
48 minutes ago, Chips said:

You can but the tune is to tune out the cel, sure some run defoulers but they dont always work .

That sure is the theory is to see if they will do it. As most header design gets better so do the abilities to defeat the CEL. Most new style Defoulers come with flow inserts to thwart that issue. Not the right way, but a way none the less.

16 minutes ago, Gangly said:

I haven't seen any Long Tube header systems throw a CEL unless they removed the cats entirely as opposed to simply moving them downstream in conjunction with 02 extensions, or installing high flow cats.  

most the green systems are pretty good about it.

Edited by IrritableVet
Chips Enthusiast

Chips

Posted
Posted
2 hours ago, Gangly said:

I haven't seen any Long Tube header systems throw a CEL unless they removed the cats entirely as opposed to simply moving them downstream in conjunction with 02 extensions, or installing high flow cats.  

Oh I just assume anyone running long tubes are not using cats . And if they are they arent factory cats which also tend to throw a code.

 

1 hour ago, IrritableVet said:

That sure is the theory is to see if they will do it. As most header design gets better so do the abilities to defeat the CEL. Most new style Defoulers come with flow inserts to thwart that issue. Not the right way, but a way none the less.

most the green systems are pretty good about it.

Im interested in defoulers with flow inserts just to further my knowledge. Can you link me .

IrritableVet Enthusiast

IrritableVet

Posted
Posted
1 minute ago, Chips said:

Oh I just assume anyone running long tubes are not using cats . And if they are they arent factory cats which also tend to throw a code.

 

Im interested in defoulers with flow inserts just to further my knowledge. Can you link me .

Defouler

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