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idle stability

This is a discussion on idle stability within the General Help forums, part of the LSx Technical Help Section category; it very well could just be a tuning issue. It doesn't sound like the idle airflow tables are correct. A ...

  1. #21
    Veteran 0rion's Avatar
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    it very well could just be a tuning issue. It doesn't sound like the idle airflow tables are correct. A good tuner though should be able to get it figured out. That being said....I wouldn't want to tune that cam. It has the potential to be a real pain in the ass.

  2. #22
    Member 383ls6's Avatar
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    i've heard that about that cam. what would you suggest for a cam. i would like to keep the 1.8:1 rockers. the heads max at .650 lift wouldnt want to go much more than .600.
    Last edited by 383ls6; 03-04-2013 at 04:58 PM.

  3. #23
    Retired NOT tired SteveC's Avatar
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    If the O.D. of the performance stall converter is smaller than the stock 12" door stop, you need to have your idle raised, at least this was done to Sara (on the dyno) after installing a Y3000.

    SteveC

  4. #24
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    Quote Originally Posted by SteveC View Post
    If the O.D. of the performance stall converter is smaller than the stock 12" door stop, you need to have your idle raised, at least this was done to Sara (on the dyno) after installing a Y3000.

    SteveC
    I don't disagree with you....I think the stall may have just shown a prior issue though. I think it's more in those idle air tables for that cam.

  5. #25
    Member 383ls6's Avatar
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    got it back. no more dying. yay. but in gear the idle is at 1150 rpms and in park 900 rpms. it doesnt thump like i would like it too with the increased rpms but at least it doesnt die. hard to look kewl when your car wont idle at a red light.

  6. #26
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    those probably aren't bad idle rpm's for that cam.....probably could get it a little lower but not much I bet. Like you say....better idling with less lope than dying with no lope.
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  7. #27
    Retired NOT tired SteveC's Avatar
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    Quote Originally Posted by 0rion View Post
    I don't disagree with you....I think the stall may have just shown a prior issue though. I think it's more in those idle air tables for that cam.
    Point well taken.

    Quote Originally Posted by 383ls6 View Post
    got it back. no more dying. yay. but in gear the idle is at 1150 rpms and in park 900 rpms. it doesnt thump like i would like it too with the increased rpms but at least it doesnt die. hard to look kewl when your car wont idle at a red light.
    Your rpms are higher in "idle" than "park" ?


    SteveC

  8. #28
    Smiles for 9.5 Years cammed goat's Avatar
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    Glad to hear you got it fixed.
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  9. #29
    Member 383ls6's Avatar
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    Quote Originally Posted by SteveC View Post
    Point well taken.



    Your rpms are higher in "idle" than "park" ?


    SteveC
    yes it idles at 1150 in gear and 900 in park. the engine seems to want to push to idle right.

  10. #30
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    Quote Originally Posted by 383ls6 View Post
    yes it idles at 1150 in gear and 900 in park. the engine seems to want to push to idle right.
    define "push" do you mean it's trying to push through the brakes at idle in gear? What size stall did you put in? PM me who you had tune it.....

  11. #31
    Member 383ls6's Avatar
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    no meant the engine seems to want to be under a slight load so it doesnt surge. its a 3k yank.pm sent

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    I'd try a different tuner. Torquer 2 is a pretty good cam also. Lift with stock rockers is .595 and .598 exhaust so you should be able to keep your springs and rockers barring any possible ptv issues. Though with the 383 I'd look for something bigger overall.
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  13. #33
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    I love the 383 but i think ive outgrown it already lol. so i think im going to start saving for a 441 cid build. prolly take a couple years to acquire the funds but i'm patient. so thanks everyone for all advice and replies.

  14. #34
    Retired NOT tired SteveC's Avatar
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    Quote Originally Posted by 383ls6 View Post
    no meant the engine seems to want to be under a slight load so it doesnt surge. its a 3k yank.pm sent
    I have a Yank 3000 installed in my vehicle, it is a 10 1/2" converter (opposed to 12" stock), and the dyno tuner set my hot idle @ 700 rpm and my in gear idle @ 600 rpm.

    When the engine is first started (cold), the idle is @ 1100 rpm (and tries to push the vehicle forward with it in park with the parking brake on) , and decreases as the vehicle warms up to the above set rpm.

    SteveC

  15. #35
    Member 383ls6's Avatar
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    what cam do you have?

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    Quote Originally Posted by 383ls6 View Post
    got it back. no more dying. yay. but in gear the idle is at 1150 rpms and in park 900 rpms. it doesnt thump like i would like it too with the increased rpms but at least it doesnt die. hard to look kewl when your car wont idle at a red light.
    Doesn't sound fixed to me, not with a 1150rpm in gear idle! What they did is put a band-aid on it. I'd consider it fixed with a hot idle of 900rpm or less! BTW, that's a medium sized cam in a stock displacement LS1, in a 383 it's seem even smaller.

  17. #37
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    Quote Originally Posted by Blue28 View Post
    Doesn't sound fixed to me, not with a 1150rpm in gear idle! What they did is put a band-aid on it. I'd consider it fixed with a hot idle of 900rpm or less! BTW, that's a medium sized cam in a stock displacement LS1, in a 383 it's seem even smaller.
    while I agree with you that they did band aid it and the idle could be lower.....that cam has a lot of overlap which will make it tricky to tune the idle for an a4 car.

  18. #38
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    It does have 11* of overlap, but that's not something extreme, it's actually very common in this day-an-age. Furthermore if there's a mechanical or sensor problem preventing them from setting the hot idle to 900rpm or less, then they should have some good insight on what the issue would probably be. IMO, a good tuner should be an equally good trouble-shooter.
    Last edited by Blue28; 03-10-2013 at 01:06 PM.

  19. #39
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    how do you figure the overlap using .050 numbers?

  20. #40
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    Easy, the cam is a 226/236 110lsa.
    226+236=462, 462/2=231.
    The lsa is 110, so 110 x 2 = 220.
    231-220 = 11

    11* overlap

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