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Xer273 no tune

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Old Jan 8, 2018 | 07:23 PM
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Default Xer273 no tune

Hi ls1tech sorry if this is in the wrong place feel free to move this as required.

Looking at a decent priced ls1 t56 swap and researching all the details. It has an xer273 cam and heads where changed to 799 with supporting valvetrain however swap was done and motor upgraded with no tune for around 400 miles. Wondering what damage is possible from a stock tune with this cam and heads. I'm assuming it's gonna run rough but is there any way to tell if it's less than conservative. I'm planning on checking plug color and maybe compression check. Or am I worrying too much here.

Thanks in advance
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Old Jan 8, 2018 | 07:48 PM
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I would never buy a setup like that untuned. That's just me
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Old Jan 8, 2018 | 09:12 PM
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Originally Posted by acidrain088
Hi ls1tech sorry if this is in the wrong place feel free to move this as required.

Looking at a decent priced ls1 t56 swap and researching all the details. It has an xer273 cam and heads where changed to 799 with supporting valvetrain however swap was done and motor upgraded with no tune for around 400 miles. Wondering what damage is possible from a stock tune with this cam and heads. I'm assuming it's gonna run rough but is there any way to tell if it's less than conservative. I'm planning on checking plug color and maybe compression check. Or am I worrying too much here.

Thanks in advance
I would be less concerned about the actual parts list and more concerned with why they want to sell it cheap. They spent good time and money on a build, and are now letting it go. The reason might be as simple as they lacked tuning, but it could be something far worse.
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Old Jan 8, 2018 | 09:29 PM
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The car definitely needs work, and finishing. I can see how a beefy cam would really affect open loop operation but would the closed loop operation be able to correct "enough" for it to be driveable.
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Old Jan 8, 2018 | 09:41 PM
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That's a rather mild cam. So yes, assuming mostly DD and not hitting it too hard, the long term fuel trims might be able to dial it in. And the factory tune is conservative on timing.

But if he drove it like he stole it...
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