gravedigger472

Cam Specs: 214° int 228° exh@0.050” lift is 0.559” intake 0.571” exhaust 114° LSA

Just last week I installed a comp 189-401-13 VVT cam into my 2010 Silverado LMG 5.3. The truck has an Airaid MIT and a dumped muffler. Along the way I installed a VVT phaser limiter, DOD delete (LS7 lifters) COMP 918 beehive springs, and COMP rocker trunnion upgrade. COMP advertise no loss of low end torque, and I can vouch for this 100%. (Based on the SOTP) the truck pulls just as hard as before on the bottom end, stronger mid range, and up top it pulls way harder.

Using HPTuners I set the the shift points to about 6,200rpm on the 6l80. It hasnt been on a dyno yet, but I would guess about 40-50whp gain up top based on experience. Also I haven't messed with the VVT tables yet. It set at about 7 degrees of cam retard by 6,000 RPM.

I can't stress enough about checking the part number on your cam phaser. I have seen many people online swap VVT cams and complain about a loss in torque, having not checked what cam core to use. If you use the wrong cam core you will loose low end torque. (see the sticky at the top of this section for more info) My 2010 used a 189 cam core.

It has a decent sounding idle, great daily driver truck cam. Check out the idle clip...

Idryfly5

sounds good! i've been debating one of the comp vvt cams in my 6.2, just haven't pulled the trigger.

Vortec350ss

iTrader: (20)

How much advance do you have in the cam in the lower RPM range?

gravedigger472

The tables control retard only, all the advance is ground into the cam. The cam stays fixed (max advance) from zero to 4,000. Starting at 4,000rpm it retards the cam 1 degree and by 6,000 rpm it's 6 degrees or so. These are the stock settings I haven't messed with yet. A few people I have talked with said leave it, some said make it retard less. Once I get in on a dyno I will play with it and see what is what.

gravedigger472

Thanks! I would say do it without any hesitation. I'm going turbo soon, otherwise I would have done more, but I am sure headers cam, and other supporting mods would wake a 6.2 up even more.

Vortec350ss

iTrader: (20)

Thats all it does stock? Doesnt seem right. Why would you need a 20* phaser limiter limiter if you only retard it 6*? Or do you mean 6* total retard after phasing out all the advance ground into the cam? Do you know how much advance is ground into that cam?

gravedigger472

Two reasons, from my understanding for needing the phase limiter. First under light load low RPM cruise condition the stock tune commands retard in the 25 to 30 degree range for a natural EGR effect, emissions, and for mileage. I disabled this out in my tune. Secondly I read somewhere that if the engine changes speed too quickly the cam could retard even further than is commanded causint PTV contact. ( I think the stock phaser has up to 58 degrees depending on the year). Unlikely that it would happen, but I guess COMP decided rather safe than sorry.

As far as actual retard under load/wot, yes it only retards about 6-7 degrees total. The cam card lists the specs given at a 107 degree intak centerline but I do not know if correlates to the intake centerline with the cam in park/max advance.

gravedigger472

Quoted from a HP Tuners forum...
"For the 6.0 liter (LY6, L76) and the 6.2 liter (L92) engine, the Park position for the CMP actuator and camshaft is 8.5 degrees before top dead center (BTDC) or 17 crankshaft degrees BTDC. The engine control module (ECM) can only command the CMP actuator to retard the valve timing from the Park position or advance the valve timing back to the Park position. The total range of valve timing authority is 31 degrees camshaft rotation, or 62 degrees of crankshaft rotation. The control range is from the Park position of 8.5 degrees camshaft or 17 degrees crankshaft BTDC, to 22.5 degrees camshaft or 45 degrees crankshaft after top dead center (ATDC)." --according to ALL DATA's description."


Edit:

Attached a pic of my actual cam retard tables.

Sunsetorangehd

Is the vvt only for better mileage.

2000 bigred

iTrader: (1)

I have the same cam in a 2010 ly6 motor with stock exhaust and little head work and 4 speed and made 345hp and 378tq at the wheels.