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How to get a choppy idle

This is a discussion on How to get a choppy idle within the Internal Engine forums, part of the LSx Technical Help Section category; I want a new cam for my car, and i wanna put a different one in my truck too. What ...

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    Member blk_jaws's Avatar
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    How to get a choppy idle

    I want a new cam for my car, and i wanna put a different one in my truck too. What do you look for when you want a cam to produce a choppy idle. My car is not stock, it has headers, catback, a cam already in it, sfc, cai, and free mods. but my truck is a 89 silverado with a stock 350. I just want a streetable cam for both

    Thanks

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    Senior Member Zboner's Avatar
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    if your going for sound and nothing else then get a GM hot cam

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    Member blk_jaws's Avatar
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    Well I'm just going for the sound of it in my truck, but I want it for sound AND performance in my car. Does to lobe seperation degree cause the sound or something like that, right?
    SLP LT's, SLP High Flow Cats, 3" Flowmaster CB, Comp Cam, SLP Lid, LS6 Intake, BBK 80mm TB, SFC, Ram Air HO Hood, Lowered, Torq Thrust II's

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    Member TACE02's Avatar
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    yes a lower LSA will cause the lopey sound... ie 110-112 to keep it streetable. also duration will play a factor also. 228+ dur. on a 112 LSA will chop pretty good. or go with a T-Rex cam 240+ dur. on a 109.? LSA those chop pretty hard...lol. for good streetability and choppy making pretty good power with a nice power curve the 228s are pretty good choices on a 112 LSA.

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    Member blk_jaws's Avatar
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    Thanks

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    member since may 2000 nhraformula's Avatar
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    a 224 or a 228 cam with a 112 lsa while have a nice lope.
    or you can get a 114 lsa cam and have the tuner lower you idle so it chops.

    what cam do you have now??
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    ArtistFormerlyKnownAsMac Silver Streak's Avatar
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    Member blk_jaws's Avatar
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    Quote Originally Posted by nhraformula View Post
    a 224 or a 228 cam with a 112 lsa while have a nice lope.
    or you can get a 114 lsa cam and have the tuner lower you idle so it chops.

    what cam do you have now??
    Its a comp cam but I dont know the spec's or anything

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    Member TACE02's Avatar
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    Thats not good, not knowing the specs... just buy one brand new that way you know where it has been and what it is. but yeah I forgot about those pesky 224s, they have some good power under the curve too.

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    Junior Member rocksws6's Avatar
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    Overlap is what gives you the choppy idle. More overlap more lope. If you want to know how much overlap a cam has try this add the intake and exhaust duration together then divide by 2. Now take the LSA and multiply it by 2. Subtract the LSA from the duration average and that will give you your overlap. This is not an exact way of figuring I'm sure, but it works.
    I + E = X
    X/2 = Y
    LSA x 2 = Z
    Y - Z = Your overlap.

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    Member blackls1ta's Avatar
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    im thinkin the 228 is gonna be my choice has good power range and still has good drivability.

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    Member Bouvers's Avatar
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    I'm trying to plan my heads and cam setup for a FI build, I'm thinking 500 rwhp. I'm new in this department so I could use some input. my understanding of this so far is that you don't want a really raunchy cam for a FI car right? why is that?
    what does the LSA stand for? or what is it exactly? should I be getting one with about 118?
    and what size of heads should I get? 64cc? sound right?

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    Quote Originally Posted by rocksws6 View Post
    Overlap is what gives you the choppy idle. More overlap more lope. If you want to know how much overlap a cam has try this add the intake and exhaust duration together then divide by 2. Now take the LSA and multiply it by 2. Subtract the LSA from the duration average and that will give you your overlap. This is not an exact way of figuring I'm sure, but it works.
    I + E = X
    X/2 = Y
    LSA x 2 = Z
    Y - Z = Your overlap.
    We got a winner^^^^^^

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    Member chieftransam's Avatar
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    where is the power at on a 224/224 581/581 112 cam? this power curve or torque curve your talking about?

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    Visualize°Design°Create SSwt00SS's Avatar
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    Quote Originally Posted by chieftransam View Post
    where is the power at on a 224/224 581/581 112 cam? this power curve or torque curve your talking about?
    here, look at my dyno sheet for example...

    i have a nice long, flat TQ curve that gives 'x' amount of TQ over a wide RPM range. a 224 cam is not a peak HP/TQ cam, it's an under the curve cam that power starts early and stays damn near steady the whole RPM range...


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    Just another Joe Eagle's Avatar
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    Damn thats a killer power band for sure... which cam is that exactly?

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    Member chieftransam's Avatar
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    224/224 .581/.581 112 (I think..)

    Mine car has a date with the dyno doctor to get it running right (running really rich) and see what my numbers will be.

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    Visualize°Design°Create SSwt00SS's Avatar
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    Quote Originally Posted by Eagle View Post
    Damn thats a killer power band for sure... which cam is that exactly?
    Comp Cams: 224/224 .581/.581 @112lsa

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    Member chieftransam's Avatar
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    thats what I was thinking..

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    Just another Joe Eagle's Avatar
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    Quote Originally Posted by SSwt00SS View Post
    Comp Cams: 224/224 .581/.581 @112lsa
    Awesome thanks bro!

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