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  1. Replies
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    I don't think stock valves are titanium right? ...

    I don't think stock valves are titanium right?



    Damn, well I was planning to pull the motor this winter to change the cam out. It is a big cam, 235/250 114, and I believe is making the car...
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    Interestingly enough, I did see variation of...

    Interestingly enough, I did see variation of .005" depending on which locks I used. I ended up using the leftover BTR dual spring locks I had because they were the most consistent.

    The springs...
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    No the whole thing was my fault. The heads are...

    No the whole thing was my fault. The heads are LME ported factory heads and they shipped with BTR duals and had correct install height. I wanted to try the conical springs and just dropped them in...
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    It wasn?t the springs it was the install height....

    It wasn?t the springs it was the install height. Every single spring needed min .030 in shims and up to .050. Cyl 7 needed the most. I guess since the heads were ported with different valves the...
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    Yeah plus the fact that it was fine for a year, I...

    Yeah plus the fact that it was fine for a year, I doubt it's the pressure.

    I am putting on TSP dual springs which are PAC racing. Will report back.
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    Spring was not broken, but I am putting on...

    Spring was not broken, but I am putting on TSP/PAC dual springs tomorrow and I will report back after I go to the track this weekend.
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    I am going to pull the valve cover tonight. I...

    I am going to pull the valve cover tonight. I figured if it was a broken spring I would have had catastrophic failure by now
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    Intermittent WOT misfire on cylinder #7

    Hello, I have been chasing a misfire for months now on my C7 h/c/i. Tried replacing spark plugs, wires, and coil pack. Someone suggested it could be a bad injector, so I replaced all the LT4...
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    Thank you for the detailed response. I am going...

    Thank you for the detailed response. I am going to the track today so maybe I'll get a chance to mess with it. It's a 4k stall, so when it unlocks in 4th it loses 3 mph and like 2 tenths, very...
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    Throttle drop between shifts

    Hello, I have been chasing this issue for a while. Car is a 2016 C7 A8 H/C/I. This car wasn't fully tuned by me and I am new to Gen 5 stuff, so I have been spending a lot of time trying to figure...
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    Fighting the same issue on my 2016 c7 it will...

    Fighting the same issue on my 2016 c7 it will stay locked until 4th then it will unlock. I lose 4 mph and 2 tenths when this happens

    Tried removing all the adaptives and continues to happen
  12. Wanted to update in case someone searches for a...

    Wanted to update in case someone searches for a similar issue. It has nothing to do with VVT.

    I believe it's just the TCS/Stability control. Apparently very aggressive in the trucks. I was...
  13. So one thing that was different than normal is I...

    So one thing that was different than normal is I ran an entire week with E85. No idea if that gunked something up, but I mixed in 10 gallons of 93 just now and drove it a good bit. Now it's pulling...
  14. 6.2 L94 Truck - Breaking up at WOT with VVT ON

    Hello, I did a 6.2 swap in my 5.3 Yukon. I have a cam motion VVT cam. I have the cam phaser installed with the block off, the most it will get is 8 degrees of retard. I have a few thousand miles...
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    Per this older thread from 2012 on tech, it...

    Per this older thread from 2012 on tech, it suggests the phaser and limiter is measured in crank degrees. So that "7" parked is 3.5 at the cam.

    But they seem pretty certain the values in the tune...
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    Thank you, I was about to drop a tvs2300 on top...

    Thank you, I was about to drop a tvs2300 on top of the 5.3 but decided on the 6.2 instead. I like simplicity... It has 50k on it, so it's fairly fresh.

    As for the cam degrees, from the...
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    https://www.underhoodservice.com/gm-ls-v8-vvt-syst...

    https://www.underhoodservice.com/gm-ls-v8-vvt-system-oil-flow-pressure/

    Looks like parked is 7 crank degrees advanced. It makes sense that these huge numbers in the tune are in crank degrees, not...
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    Thanks. Any recommendations on specs? I am a...

    Thanks.

    Any recommendations on specs? I am a big fan of Cam Motion. They were amazing to me when I had issues with "whining" camshafts from another vendor and sent me a free cam to fix it. I...
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    That's great to hear. That's exactly what I...

    That's great to hear. That's exactly what I want.

    Guess I got some reading to do.
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    VVT or no 6.2 Yukon XL

    Hey all, been away from the forum a while.

    I have a 5.3 Yukon XL, it is anemic as you can imagine. I did a DOD delete with a 206/212 112 cam, eliminated VVT, and added headers. It picked up...
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    Any cliffs? Seems like gen 4, the limit table is...

    Any cliffs? Seems like gen 4, the limit table is our ticket now?
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    I was just sanity testing to see if any settings...

    I was just sanity testing to see if any settings worked. 2nd was engage at 19 mph and release at 12 mph or less no matter throttle, so as soon as I hit 19 mph it does indeed lock, but I hit 300...
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    2008 G8 missing tcc wot TUTD

    Hi, I do not see the WOT TCC tables for TUTD in my 2008 tcm for my g8. Therefore, I cannot lock my tcc at wot for manual mode. Can you add them?
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    I think the problem is that the TUTD tcc tables...

    I think the problem is that the TUTD tcc tables for wot are missing and it is going into wot mode at 300 ft lbs
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    Tried upping the torque rows in the apply ramp...

    Tried upping the torque rows in the apply ramp with no luck. This is puzzling.
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