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Got my truck back today, Boy did i screw up, had a tank full of 87 oct.and bad
weather.the temp was almost 94 deg with 25% hum. it knocked every time they added
timing and the fuel curve sucked. we wound up with 284.9 hp / 293.8 tq.
the tuner wants back with me to bring it back with 93 oct on a cooler day so he
can retune it, he was very unhappy with the results just as i was. will post the dyno
sheet tonight, when i get to my scanner.

 

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Yikes. In for round two. Definitely curious.
 

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from 244 to 284. that's not bad!
 

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Discussion Starter #4
the tuner is thinking more like 300+hp it's dying to soon in the rpm range
 

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I believe he just finished his cam install before the tune.
 

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Discussion Starter #8
I installed a Comp cam 210/224 .558/.560 114 CL 1500-6600 rpm
it's an all around cam. stock converter,nice idle and i can still tow with it.
even moving the VVT timing around didn't help much. could only put in 6 deg adv.
i think he said. going back in a few weeks to retune it.
 

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Al that cam is designed for the square port L92 heads with the huge intake valves. Probably a great FI cam for cathedral ports but not ideal for NA 5.3s. Needs more intake or less exhaust duration. And that's not me talking, that came from Pat G when I was researching VVT cams.
 

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Discussion Starter #10
Tony thanks for that info, I am going to call Comp on Monday. that's the cam
they said would work great in my truck.
 

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Tony thanks for that info, I am going to call Comp on Monday. that's the cam
they said would work great in my truck.
They told me the same thing AFTER I had emailed Pat G! So I knew they were full of shit. They say that because they have no VVT cams dedicated to the cathedral port engines. Pat G said a 212/218 or 218/224 would be much better suited to a 5.3.
 

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Well at least comp cams is a big company so you may get lucky and have them swap it out for something more suited even though it's been installed.

Call them and just be reasonable and tell them it is not what you expected and did not work as you were promised on the phone prior to purchasing.
 

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Al, Pat G will spec a cam for you for $25. They use Comp or their own hardened billet cores. And they give a discount on the cam so you basically get it spec'd to your needs for free. But you need to get Comp to take back that "6.2" cam first.
 
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