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Thread: How does LSA affect performance?
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07-20-2011, 09:58 PM #1
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2001 3.8 Black - sold- 2000 SS Black M6
How does LSA affect performance?
I'm looking at buying a torquer V2 cam, and you can get it with all the same specs, except the LSA is available at 111, 112, 113, and 114. Ive seen other cams as low as 108, and as high as 116.
All I know is that the lower the number, the choppier the idle. 114 is stock, I've heard a 111, it was too choppy for me, so I'm thinking 112 or 113.
My question is, when it comes to track times or dyno numbers, what end affect does the LSA have.....
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07-24-2011, 06:22 AM #2
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2000 Grand Prix GTP- 2000 Trans Am WS6 M6
Condition---------------Wide Separation Angle-----Narrow Separation Angle
Overlap-----------------Decreased-------------------Increased
Low End Power---------Higher-----------------------Lower
High End Power--------Lower------------------------Higher
Detonation Potential---Lower------------------------Higher
Intake Events----------Later-------------------------Earlier
Exhaust Events--------Earlier------------------------Later
Overlap----------------Decreased--------------------Increased
Manifold Vacuum------Higher------------------------Lower2000 Pontiac Trans Am WS6 M6: 427ci LS3, Built T56, Moser 9" w/ 4.11 Gearing, Full Suspension, and 6-point Cage.
2000 Pontiac Grand Prix GTP: Twincharged w/ a T67 Turbocharger
2007 Chevrolet 3500 Dually Duramax: 3" Downpipe, Dual 4" Exhaust, EFILive Tuning
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07-24-2011, 06:59 AM #3
There is one descrepancy with the list. Detonation potential is backwards. A narrow lobe seperation affectively increases overlap, which is the area where the intake and the exhaust valve are open at the same time. This actually bleeds off cylinder pressure, which in turn lowers the dynamic compression ratio and reduces the chance of detonation at slow speeds. That's why the vacuum signal is so weak with a tight LSA, cylinder pressure is low when both valves are open.
Tighter lobe seperation works great on cars with more compression than pump gas can handle, especially cast iron heads. As it bleeds off cylinder pressure it gives you some wiggle room before detonation becomes a problem providing the tune is spot on.
Tighter lobe seperation does give you that choppy idle, but what it also does is bring the power curve in sooner.
One of the reasons these LS1's seem to make endless top end power is because of their very wide LSA from the factory (116 or more) It kills the bottom end potential however. It's one reason why these cars love gears.
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08-04-2011, 09:56 AM #4
But Firebird, the wider lsa should give a later intake valve closing point which would also drop dynamic compression.....right?
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08-04-2011, 11:05 AM #5
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sebring silver- Y2K SS CAMARO
if your wanting a choppy idle the just go with a 112 or 113 when you get into the 114 or higher its smooth and below 112 you are going to have a hard time finding a tuner that will mess with it
2000 ss camaro, forged lq9 370 short block, stage 3 PRC 243 heads, fast 102 w, big mouth throttle body, MS3 cam, 1.7 roller rockers, stage 3 t-56, monster stage 3, pro 5.0, 4.10's with moser axles, bmr tq arm, lca's, phb. SOLD (thankfully)!!!
New project: 1968 step-side, partial restore, ls/th400 swap. hopefully boosted pics and more info to come!!!
Having a small cam is like having a small dick, everytime you go to use it you wish it was bigger
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08-05-2011, 09:35 AM #6
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2001 3.8 Black - sold- 2000 SS Black M6
i think 113 will be good for me...
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08-05-2011, 02:36 PM #7
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SOM- 2002 SS
just a different perspective. I like to think of it as an oval on say a dyno graph. think of the oval as the powerband. tighter/narrow lsa and the oval gets thinner but taller. Wider lsa and the oval gets wider (more rpm range) but shorter (less power). Alter duration to where you want the peak in the rpm range.
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08-05-2011, 03:11 PM #8
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Bat mobile black- 2000 Trans am WS6 M6
112lsa is not hard to tune. You live in texas so there are probably a handful or good tuners out there so i wouldnt be worried if i were you
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08-05-2011, 04:17 PM #9
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08-06-2011, 08:35 AM #10
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08-06-2011, 09:09 AM #11
For a 2000 LS1, the cam specs stock are:
202/210 int/exh @ 0.05" duration
0.496" / 0.496" int/exh lift
116 LSA
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08-06-2011, 01:29 PM #12
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2001 3.8 Black - sold- 2000 SS Black M6
oh wow, i didnt know it was that wide...somewhere i read 114, guess it was wrong
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08-07-2011, 12:51 AM #13
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08-07-2011, 07:34 AM #14
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09-22-2012, 06:35 AM #15
I have the torquer v2 cam with a 112 lsa +2. I tuned this car myself, and by no means am i a tunner, so to say that there isn't a Professional tunner out there that can't tune a 112 is wrong.. Most would and could tune a 112 and even a 110 isn't out of the question... Just my 2cents..
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09-22-2012, 01:53 PM #16
Lots of good info in this thread. Not sure why I missed it the first time, so let's get it stickied for future reference.
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09-24-2012, 08:56 AM #17
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09-24-2012, 10:10 AM #18
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Navy Blue Metallic/Black- 02 camaro z28/01 wife t/a
ey thats the cam im getting for the trans am v2 with a 112 lsa and 3600 stall
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09-24-2012, 01:59 PM #19
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2001 3.8 Black - sold- 2000 SS Black M6
very nice...my heads cam build is currently on hold due to funds
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09-24-2012, 07:49 PM #20
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Navy Blue Metallic/Black- 02 camaro z28/01 wife t/a
im waiting on tax returns lolz Thank you uncle sam!
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