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Header Question -Tune?
I have an exhaust leak on the Manifold/Header
If I put an aftermarket Header on, do I need a Tune or will it bolt right on, no tune needed - Will it code? Also curious if I do a High Flow Cat and Muffler at the same time will I need a Tune? Will it code the 02 sensors Tks Will |
You don't need a tune for anything. What year is your jeep
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I thought these were sd motors?
changing anything regarding intake or exhaust will alter the afr. I'd think ESP something like a manifold to header swap. I know it leaned my ls1 car WAY out doing such. and that was with a maf... sd motors are like carbs in a big way. I'm pretty sure the o2s can only change fueling like +\- 3% or whatever. |
Originally Posted by wiggles
(Post 2397010)
You don't need a tune for anything. What year is your jeep
Will |
Originally Posted by s346k
(Post 2397025)
I thought these were sd motors?
changing anything regarding intake or exhaust will alter the afr. I'd think ESP something like a manifold to header swap. I know it leaned my ls1 car WAY out doing such. and that was with a maf... sd motors are like carbs in a big way. I'm pretty sure the o2s can only change fueling like +\- 3% or whatever. tune after headers... Will |
Originally Posted by Willfulone
(Post 2397094)
That why I asked - I do LSx parts for a living and know they need a
tune after headers... Will looking into swapping my jeep. I just sold my 99 ws6 2 weeks ago. |
Originally Posted by s346k
(Post 2397100)
then you already know the answer. these are sd motors. best you could do is verify with a wideband. are you a vendor on tech? I don't do lsex parts for a living but I've owned multiple lsx powered cars and dealt with them about 10 years now. love em.
looking into swapping my jeep. I just sold my 99 ws6 2 weeks ago. I can do a Corvette half asleep, but I don't know squat about these Jeep straight 6's Will |
Originally Posted by Willfulone
(Post 2397086)
1999 4.0 Will |
Originally Posted by wiggles
(Post 2397161)
You'll need a cat with an o2 bung on it
Will |
Just put it on.................
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Originally Posted by Willfulone
(Post 2397204)
Pipe has a 02 before and after the cat, in the exhaust pipe already... Will |
Yeah... Just bolt it on up...
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You only need to tune the 4.0 if you do a stroker or super/turbocharge it... Intakes and exhausts are called "bolt on" for a reason
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Originally Posted by salad
(Post 2397873)
You only need to tune the 4.0 if you do a stroker or super/turbocharge it... Intakes and exhausts are called "bolt on" for a reason
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Originally Posted by s346k
(Post 2398114)
they are called "bolt ons" because they literally bolt on. not because of how they affect the engine. I'd like to see someone verify with a wideband what actually happens when doing mods like this, just to see. as stated earlier, putting bolt ons on my ls1 car took it from a solid 12.8 afr @ wot to 14.7 at only 2800 rpm. bolt ons or not that is not safe or right. the lean condition also caused 8* spark knock. also all below 3k rpm.
As stated by Salad, the only time you need to increase injector size is when using forced induction or stroking it to 4.6 + liters. |
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