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How does LSA affect performance?

This is a discussion on How does LSA affect performance? within the Internal Engine forums, part of the LSx Technical Help Section category; I'm looking at buying a torquer V2 cam, and you can get it with all the same specs, except the ...

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    James Bond Spikito's Avatar
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    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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    Moderator Firebirdjones's Avatar
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    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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    cutting and welding mark21742's Avatar
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    But Firebird, the wider lsa should give a later intake valve closing point which would also drop dynamic compression.....right?

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    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
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    James Bond Spikito's Avatar
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    i think 113 will be good for me...

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    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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    Senior Member Lunatikgixxer's Avatar
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    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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    Quote Originally Posted by 5abivt View Post
    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.
    this is by far one of the best posts i have seen on the forum yet. i wish this was around when i wasnt too sure about cam selection

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    Quote Originally Posted by Spikito View Post
    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, 1 114 is stock,
    114 lsa is not stock

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    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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    James Bond Spikito's Avatar
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    oh wow, i didnt know it was that wide...somewhere i read 114, guess it was wrong

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by 5abivt View Post
    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.
    I agree, this is a GREAT example!

    My 115 lsa cam is very choppy......but it is a 255/266.

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    Senior Member Lunatikgixxer's Avatar
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    Quote Originally Posted by WICKEDLS1 View Post
    this is by far one of the best posts i have seen on the forum yet. i wish this was around when i wasnt too sure about cam selection
    I agree that makes a lot of sense.

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    Quote Originally Posted by Spikito View Post
    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.....
    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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    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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    Quote Originally Posted by 5abivt View Post
    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.
    I'm one of those visual hands on kinda person. Could you post a pic to show this^^^?


    I'm trying to picture what you stated.

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    ey thats the cam im getting for the trans am v2 with a 112 lsa and 3600 stall

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    James Bond Spikito's Avatar
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    very nice...my heads cam build is currently on hold due to funds

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