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  1. #1
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    Default Peak timing for "BIG" Cams

    When i went from a 91 intake cam to BC2 cams i didnt change the timing much. Never been on the dyno either.. I was running a peak timing of about 40 or 41 deg... Its felt good on the butt dyno lol..

    Well now i have BC3 cams and springs

    Just wondering what some of you guys are running for peak timing with big cams like BC3/JWT C2 or bigger etc...?

    I have my current peak/Max timing at about 34 deg right now.

    Im up to posting/sharing some timing maps here.
    Last edited by Haulin200sx; 07-22-12 at 05:10 PM.
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  2. #2
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    Default

    I'd like to see your timing maps for the BC2 cams!

  3. #3
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    Default

    What CR its your Motor??
    40-41 its wayyy too much
    Maybe 30-32 if you are 10:1 on 93 US octane
    On what fuel octane??

  4. #4
    The People's Mod
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    Default

    By peak timing, you mean torque peak right?

    30 degrees is max I'd go on stock cams at torque peak and that is pushing it on 93 octane. Keep in mind with higher flowing cams, you need/want less timing at torque peak. And your torque peak will move to higher RPM. I'd start around 26 degrees BTDC at torque peak and work from there.
    Last edited by BenFenner; 07-16-12 at 06:33 PM.

  5. #5
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    Default

    hopefully his mechanical timing was retarded and in reality he was running like 32* max lol.
    N14GTI-VVL - RIP - Best Qtr: 13.147 @ 99mph 1.87 60'
    S13240SX-VVL+T
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    ---> Z33

  6. #6
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    Default

    I ment, like whats the max timing that you guys are running ie 6,400rpm and above.

    Ben, and this talk of peak torque timing. Do you mean what is my timing at peak torque? I've never been on the dyno but i assume your asking my timing around 4,000 to 5,000rpm (where peak torque should occur if im not mistaken).

    My fuel is just supreme which is 91 octane here on the east coast
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  7. #7
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    Here are the 2 timing tables:

    The first table i used to use when i had just a 91' intake cam and then BC2 cams.

    The second table (lower timing) is the table i am currently using with my BC3 cams.

    feedback more than welcome!
    Attached Images Attached Images
    Last edited by Haulin200sx; 07-22-12 at 06:11 PM.
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  8. #8
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    .....
    Last edited by Haulin200sx; 06-29-13 at 07:13 PM.
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  9. #9
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    Default

    Is this general rule of big cams or big displacement motors true:

    That they like less timing? If so just a bit less or a lot less?

    In the WOT range of the table (last 2 columns),
    should the timing rise slowly and then jump to meet the max/peak timing? (lower timing in the low to mid range)

    OR

    should it rise rapidly and smoothly to the max/peak timing (more timing in the low to mid range)
    Last edited by Haulin200sx; 07-22-12 at 08:48 PM.
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  10. #10
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    Default

    anyone else want to help out or share their timing map for a all motor de?

    I have come up with a 3rd revision of the timing map that seems to work well. I will post it later tonight...

    I think im close to what i need with a max timing of about 32deg.........

    Just wondering how long i should hold it at around 32deg? only from around 5,000rpm and up or should i hold 32 deg from a lower rpm like 3-4,000rpm?

    From posts ive found here on the forum it seems like a all motor de, likes just a bit over stock timing below 5K and about 32deg from 5K to the limiter.
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  11. #11
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    Default

    Stuff like this is what I was asking you about before. Only thing with mine is that I still have to go lower because of the nitrous lol.

  12. #12
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    .....
    Last edited by Haulin200sx; 06-29-13 at 07:13 PM.
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  13. #13
    9k rpm crew
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    Only way to figure out the best timing is to put on the dyno. Start conservative and slowly add timing until you don't see any torque gain. Otherwise it's all guessing.

    You need some more work on your timing map. Column 56-76 should be equal or more than 80-84. Higher loads require less timing. Base on your timing map, at 3/4 throttle you have less timing than at 100 % full throttle.

  14. #14
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    or log the TP values.... u wont get "torque" numbers but ull get the graphs shape.

    use the MAF logs for your "hp" curve.
    N14GTI-VVL - RIP - Best Qtr: 13.147 @ 99mph 1.87 60'
    S13240SX-VVL+T
    K6 GSX-R600
    ---> Z33

  15. #15
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    5speed- Most of the map is a stock de map with a few deg added and different WOT colums.

    I always wondered why the end of the stock map had the timing go lower like that. I will keep the timing going as you stated.
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  16. #16
    9k rpm crew
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    Default

    The timing map you have is not based off of the stock B13 timing map. The problem with all the bin sharing is people are making changes to the stock map and are not relabeling them after the changes. So want you think is a stock map is actually somebody else map with changes.

    If you look at the your map at 1150-2800rpm and 16-44tp, you will see it has a lot of timing, a lot more than stock for sure, too much if you ask me. The engine might seem to be responsive and snappy off throttle and cruising around town but you going to get a lot of pinging on a hot day. Your high load full throttle timing around the same rpm is good and conservative.

  17. #17
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    5speed,

    The last map i posted is from a supplied tunercode stock rom. The map is advanced 3 deg across the whole map and then the last two columns are totally changed. Not sure what a stock maps your talking about.


    Anyone care to post up your n/a de timing map?
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

  18. #18
    NismoTronic Guy
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    The biggest problem I see with your timing map is that is shouldn't have the HUGE shifts in timing before the last two columns, it should be a smooth transition to those values.

    For example, it shouldn't go from 18 -> 31 from 1 column to the other!

    If you want.. I can send you over a dyno tune Stock DE timing map for you to compare to.
    Last edited by JKTUNING; 08-10-12 at 08:55 PM.
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  19. #19
    9k rpm crew
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    Quote Originally Posted by Haulin200sx View Post
    5speed,

    The last map i posted is from a supplied tunercode stock rom. The map is advanced 3 deg across the whole map and then the last two columns are totally changed. Not sure what a stock maps your talking about.


    Anyone care to post up your n/a de timing map?

    What you got is not the factory timing map for the B13. There are a lot of bins out there labeled as factory but they're not.

    If you go to the old forum under the section called Calumsult, you will have a lot B13 bins to compare. You want to look for a bin labeled 91nx2000.bin It's the totally stock unmolested factory bin.

    Your second option is get someone with Nissandatascan with a stock ecu do a snapshot of the timing map for you.

  20. #20
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    .....
    Last edited by Haulin200sx; 06-29-13 at 07:15 PM.
    1995 200sx SE-R
    Custom 4 to 1 header, 3" VRS exhaust, Doug Fab Custom Intake Manifold w/70mm TB, 3.5" Intake w/Stack, BC3 Cams & Springs, CS cam gears, XTD lightweight flywheel, G spec pulleys
    ~Soon to be C.O.P.~

 

 

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