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Old 05-09-2010, 07:09 AM   #1
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Mast Motorsports Cam Slugfest (VVT vs LS3)

This is from the GM High Tech Performance Magazine (July 2010)

In the article Mast Motorsports stage 1-3 cams were dyno tested on an L99 and LS3. What I found interesting was that the L99 VVT Mast Motorsports stage 1 and stage 2 cams made more HP and TQ below 5100 rpms than the LS3. Above 5100 rpms they made basically identical power.

The LS3 did make more HP/TQ with the stage 3 cam by 10.4 hp, 8.2 ft. lbs at higher rpms.

I keep hearing about guys doing LS3 conversions, but after reading this article there seems to be some advantages to the VVT cams.

Last edited by SGOS252382; 05-09-2010 at 07:26 AM.
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Old 05-09-2010, 07:40 AM   #2
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how can you put a stage 3 cam on a l99. i thought the AFM cylinder's strings couldn't take it and once u replace them and that deletes AFM. i might be showing my ignorance so don't judge me lol.
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Old 05-09-2010, 02:02 PM   #3
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how can you put a stage 3 cam on a l99. i thought the AFM cylinder's strings couldn't take it and once u replace them and that deletes AFM. i might be showing my ignorance so don't judge me lol.

You might know more than I do.

I'm just going off the magazine. They show a stage 3 dyno graph comparing the L99 vs LS3.
Mast Motorsports uses different cams in their packages. The L99 cams have lower lift and have lower compression. Even with a smaller cam, the L99 makes similar HP.
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Old 05-09-2010, 03:28 PM   #4
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[QUOTE=
Mast Motorsports uses different cams in their packages. The L99 cams have lower lift and have lower compression. Even with a smaller cam, the L99 makes similar HP.[/QUOTE]

Just read the article and very interesting. Article talks to VVT only and I did not read anything bout AFM or replacing the lifters related to AFM. They were reving the Stage 1, 2, and 3 L99 and LS-3 motors to about 6800 rpm except on the baseline test of the L-99. They replaced valve springs with the replacement cams. Stage 3 comparison used ported heads with the Stage 3 cams to aid heavier breathing needed. Stock heads with Stage 1 and 2 cams. Cams were slightly different between L99 and LS-3 with all three Stages. Also Mast Motorsports limits by half or more the amount the cam phaser can alter cam timing. Stock is 52 degrees of rotation and Mast limits the travel to 32 or 22 degrees depending on cam selected. A mechanical limiter is inserted into the cam phaser to accomplish this. I would assume the ECM has some tuning done to it as well but not sure. Lastly, the article makes the VVT switch appear very attractive for L99 owners. However, we know nothing of the tunes used so we really do not know how to compare the validity of the test done for the magazine. Looks like help is on the way for L-99's.
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Old 05-09-2010, 03:35 PM   #5
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Old 05-09-2010, 03:56 PM   #6
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L99 with mast stage 1 cam on a procharged 2ss auto. I was running out of fuel at 538rwhp on the dyno and got the fastlane duece pump and went to 573rwhp. I used the trunion upgrade kit from comp because i blew a stock rocker at the strip and i would reccomend the 7.4 pushrods for l99 usage.
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Old 05-09-2010, 04:04 PM   #7
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This mast stage 1 cam specs are;
duration@ .50 220/234
lift 573/588
lsa 116 deg
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[SIGPIC][/SIGPIC]Va.Speed built 427 stroker
LS2 Darton sleeved 427 stroker.Callies dragonslayer crankshaft. Callies I beam rods. Wiseco blower pistons. Mast cnc 12 degree big bore ls3 heads-2.2 intake &1.6 ex. 6 bolt 270cc-.750 deck. Lunati link bar lifters.T&D roller rockers.COMP-VA. Speed special cam 605 lift, 238dur. Procharger F1R @15psi. ARH headers with custom 3'' exhaust all the way.Magnaflow mufflers. QTP cutouts.Rossler built 6l80e trans. DSS 1400hp axles.
Pfadt suspension.-Coilovers, sway bars,motor mounts,trailing arms. Aeromotive eliminater pump.
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Old 05-09-2010, 04:09 PM   #8
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I need to add that this cam is user friendly on the street but comes on strong at above 3000rpm. You may need to up your idle rpm for this.
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Pfadt suspension.-Coilovers, sway bars,motor mounts,trailing arms. Aeromotive eliminater pump.
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Old 05-09-2010, 07:38 PM   #9
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I need to add that this cam is user friendly on the street but comes on strong at above 3000rpm. You may need to up your idle rpm for this.
Does it have a nice lope
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Old 05-09-2010, 10:51 PM   #10
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Old 05-09-2010, 11:01 PM   #11
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Does it have a nice lope
For some reason I don't like cam lope? I like the sleepers that are quiet then roar with the pedal down. Just my personal taste.
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Old 05-09-2010, 11:13 PM   #12
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then dont do a cam.. just do a kenne bell, "set it and forget it!" lol :-)
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Old 05-10-2010, 04:16 PM   #13
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For some reason I don't like cam lope? I like the sleepers that are quiet then roar with the pedal down. Just my personal taste.

That's all in the tune. I had a real strong cam lope on my GTO. I loved it and so did everyone else that heard it. But before I sold my GTO, I had my tuner tune my car so it would idle as close to stock as possible. I was amazed at how he had my car running.
I just assumed it would have a strong cam lope just because the car had a more aggressive cam in it. But that's not always the case. Most cams can be tuned to idle very close to stock like.
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Old 05-11-2010, 12:02 PM   #14
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Quote:
Originally Posted by SGOS252382 View Post
That's all in the tune. I had a real strong cam lope on my GTO. I loved it and so did everyone else that heard it. But before I sold my GTO, I had my tuner tune my car so it would idle as close to stock as possible. I was amazed at how he had my car running.
I just assumed it would have a strong cam lope just because the car had a more aggressive cam in it. But that's not always the case. Most cams can be tuned to idle very close to stock like.
That was probably done by raising the value in the TPS and increasing the idle. The "lope" of a cam is a combination of its duration and lobe separation angle... Those are physicaly aspects you just can't remove or "tune out".
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