Dnyo History Comparison

Discussion in 'Dyno Performance' started by Dalamar, Feb 6, 2007.

  1. Dalamar

    Dalamar Legend Retired Staff SN95 Supporter

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    What do you guys think of the differences here?
    I choped and scaled in my 3 different dyno's.

    First is - stock with mufflers and CAI, Auto
    Second is - ported PI headswap, cams, mufflers, Auto
    Third is - Stroker, Ported PI's, cams, mufflers, Manual

    Keep in mind that along with the stroker assembly, the compression changed from 10.3:1 to 9:1
    and it's changed from an auto to a manual Transmission.

    My elevation here is 4200 ft, and these were all loaded dyno pulls
    There's more to come, but here's the NA comparisons on my Modualar (so far)

    Edit: if your not sure what your looking at, here's the beef

    the fat fuzzy lines are stock NPI with mufflers and CAI. sux like a boat ancor. 5 years ago or something.

    the thin lines are the dyno after my PI/Cam swap, auto trans
    blue is torque, red is HP

    the fat color lines are my latest dyno
    Stroker, Manual trans ect. - HP (red) and Torque (blue)


    What do Y'all think?

    <img src="http://www.sn95forums.com/hosting/users/dalamar96/dynocompair.jpg" />
     
  2. 95KBGT

    95KBGT Legend

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    wow if im reading this right thats some good shiet
     
  3. FIVELITERS

    FIVELITERS Well-Known Member

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    Thats pretty neat. :)
     
  4. Dalamar

    Dalamar Legend Retired Staff SN95 Supporter

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    Thanks KB, thanks 5L

    it's interesting how different they are.
     
  5. ALITL8

    ALITL8 Well-Known Member

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    by different do you mean the way the torque curve drops off faster with the new set up? what gears are you running? your numbers are definitely better but i was expecting more... especially in the torque curve. looks like with your last set up you made solid, steady torque all the way up to 5K before it started falling off. now you hit peak torque at 4K and then it immediately starts falling off :dunno:

    i like the new numbers by the way. when are you going to the track?
     
  6. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    from the results and research i have seen done on strokers on 4.6's this is typical. The piston come out of the bore way too much at BDC and they actually wabble and become unsteady...Thats one of the reasons you will never hear get a stroker on a 4.6 come out of my mouth. I considered it a few years ago but after talking to a few guys who raced modulars over on Modular Depot and then seeing test results the Tymesky's (modular performance) posted on Corral a few years ago (stroker vs big bore) i just came to the conclusion that it will give you a small boost in TQ down low but you will be hindered in the HP and higher rpm TQ #'s and you see it on Dal's dyno. I was told go Big Bore or stay at 281-284 ci by a builder who sells stroker kits all day long. Modulars already have all the stroke you need...we need more bore.
     
  7. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    Oh let me add this so it doesn't seem like i'm bashing Dal, his combo was built for Turbo so while his compression isn't low its not what most NA cars are at and he would certainly have better numbers if he was @ 10.0 CR...and these strokers seem to respond well to FI and since Dal is going the Turbo route he will be making big power down low and not have to wind that thing out to 6500rpm's to make power so his ride will be sick!
     
  8. Dalamar

    Dalamar Legend Retired Staff SN95 Supporter

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    That's interesting, thanks for the replys.

    I hear what your saying DT, but I still think the Bore vs Stroke is hyped up.
    I think this is a pretty good gain in torque in the lower RPM's, which is what I wanted.
    It does fade off on the higher rpms compared to before.
    I don't know exactly why, but I don't think it's piston wobble.
    I've heard from a number of sources that - that first test everyone likes to talk about was on some POS stroker parts.

    In the picture of the bottom of my longblock, you can see the first piston at BDC, and it's not far out of the bore.
    :dunno:


    I'm not done yet boys, this was just the first tune on a brand new motor.
    thanks for the feedback.




    Edit - that's correct DT, thanks for unbashing me :)
     
  9. Dalamar

    Dalamar Legend Retired Staff SN95 Supporter

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    The compression is a big difference.
    on the PI before, it was 10.3:1
    the after dyno is 9:1 compression.

    Do you think maybe on reason the torque fades is that it's not getting enough fuel?
    it's still pushing the stock 19#ers - woot
     
  10. Lightning Struck

    Lightning Struck Legend

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    Hmmm they really drop there after the 5 grand mark, I would think a inadequate fuel system would definitely hurt.......but those numbers really go on the decline :( could the fuel hurt THAT MUCH??
     
  11. ALITL8

    ALITL8 Well-Known Member

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    damn if i know... something to talk to the tuner about though. like Jeff said, this is the first tune on a fresh build... could all be in the tune.
     
  12. uncltrvlnmatt

    uncltrvlnmatt Legend

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    DropTop has some interesting thoughts on piston wobble at BTC, but IMO if it the piston were to wobble enough to make the torque and HP curve drop that much that quick, that engine would vibrate violently and self destruct. Like I said that is my opinion.

    If you have a bored, stroked, cammed, ported, PI set up, you need to give that bitch some fuel. Those stock injectors and fuel pump won't keep up. You need to feed it same as anything else.

    It would be like installing a 2bbl carb on a HiPo 289, it is going to starve for fuel.

    I would talk to your engine builder, or a tech support line and get some pump and injector recommendations.
     
  13. Dalamar

    Dalamar Legend Retired Staff SN95 Supporter

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    thanks for your input, I will be talking with my tuner on it.

    It could just be the Compression difference and fuel ?
     
  14. ryclef331

    ryclef331 Well-Known Member

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    Your HP numbers stayed up there.... Your TQ dropped.

    You gotta remember that with an auto, a torque converter provides TORQUE MULTIPLICATION so that number will be high. I would say that you're giving up some power with those injectors BUT your tq loss can ALSO be attributed to the switch from an Auto to a Manual.

    Dyno's are great for tuning and bragging rights but the TRACK is where its AT. THATS the Before and After that MATTERS!
     
  15. Dalamar

    Dalamar Legend Retired Staff SN95 Supporter

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    Roger that Ryclef, thanks for you input.


    I dont know the exact reason, it's probably attributed by a number of factors.
    I'll do some asking and more tuning :)

    compression
    fuel injector size
    Torque convertor - Auto/Manyal swap
    longer stroke

    Does the flywheel have anything to do with it?
    the stock wan was small, and the new one weighs like 30# or something.
    It's a beefy SOB.


    Thanks for the feedback everyone.
     
  16. ryclef331

    ryclef331 Well-Known Member

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    Rotating mass is the most parasitic of all. That can affect it as well.
     
  17. uncltrvlnmatt

    uncltrvlnmatt Legend

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    +1 increased mass is a big power thief.
     
  18. TRUUBLE

    TRUUBLE -Never Forget-

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    I dunno . .. mine also starts dropping off a bit when I get over 8500 rpm . . . :pimp2:
     
  19. ALITL8

    ALITL8 Well-Known Member

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    now thats funny shit right there!!!