Most power out of a Built K24Z7 so far?
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Thread: Most power out of a Built K24Z7 so far?

  1. #1
    Greenhorn
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    Most power out of a Built K24Z7 so far?

    Have any of you guys built your K24Z7 and really pushed it yet? If so, please share the details and results

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  3. #2
    Nooblets RRCoupe's Avatar
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    Anything over 700 sleeved block will start distorting. Over 550 stock k24 will crack a sleeve. People claim 600 stock motor but that's just a kill mode bragging number.

  4. #3
    Nooblets
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    You can probably do like 300-ish on stock internals. Maybe even close to 400, but I would start praying if things are good after 300hp. You can definitely do 500 with built internals.

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  6. #4
    Big Timer!!! 9thgensifamily's Avatar
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    I'm sitting at over 360WHP with a full race turbo kit, stock block and transmission, no issues.

    First problem on a Si is 4th gear at my power level, planning on gears this winter. Next is non-return fuel system at around 430 WHP. Believe after 450 WHP your risking things without rods and pistons, that's my safe recommendation. Get past all these items, seems like 700 is a good goal, but not sure if they were closed deck or not. Either way, well over 500 WHP. Common for super charged cars to make 400 after parisitic loss (meaning crank made 400+).

    No cams are made for our engine, so plan on head swap and loads of cash if your talking a N/A build.

  7. #5
    One Bad Mama Jama!!! TenZen's Avatar
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    Quote Originally Posted by 9thgensifamily View Post
    I'm sitting at over 360WHP with a full race turbo kit, stock block and transmission, no issues.

    First problem on a Si is 4th gear at my power level, planning on gears this winter. Next is non-return fuel system at around 430 WHP. Believe after 450 WHP your risking things without rods and pistons, that's my safe recommendation. Get past all these items, seems like 700 is a good goal, but not sure if they were closed deck or not. Either way, well over 500 WHP. Common for super charged cars to make 400 after parisitic loss (meaning crank made 400+).

    No cams are made for our engine, so plan on head swap and loads of cash if your talking a N/A build.
    Is it just the 3rd and 4th gear that needs to be replaced when going turbo?
    2015 Rallye Red Si Coupe
    Acuity Curl CAI, Hasport Torque Mount & Rear Motor Mount, Acuity Shift Linkage & Shifter Base Bushings, Acuity ESCO Shift Knob, BFGoodrich g-Force COMP-2 A/S, FKX RSB/LTB, SiriMoto FSB/RLTB, Full Race Cat-Back, RV6 Catted DP

  8. #6
    Big Timer!!! 9thgensifamily's Avatar
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    4th gear likes to strip teeth off. They make "kit", I think it's 1-4th and the gears are slightly taller. After the gears, I've read it's held up to at least 700 HP. I have to say, at 360 WHP the gears are way to short, my 0-60 hasn't improved over when I was stock. Rolling start to 60 is a different story.
    I've heard of putting a final drive out of a different model Honda, making 1st gear top at near 60 MHP (I don't think this is worth while however).

    When I get to work, I will definitely be watching your YouTube videos.

  9. #7
    Greenhorn
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    Quote Originally Posted by 9thgensifamily View Post
    I'm sitting at over 360WHP with a full race turbo kit, stock block and transmission, no issues.

    First problem on a Si is 4th gear at my power level, planning on gears this winter. Next is non-return fuel system at around 430 WHP. Believe after 450 WHP your risking things without rods and pistons, that's my safe recommendation. Get past all these items, seems like 700 is a good goal, but not sure if they were closed deck or not. Either way, well over 500 WHP. Common for super charged cars to make 400 after parisitic loss (meaning crank made 400+).

    No cams are made for our engine, so plan on head swap and loads of cash if your talking a N/A build.
    Thanks for sharing your results - If dont mind me asking, which turbo did you end up with and how much boost did you run

  10. #8
    Greenhorn
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    Any one else have a turbo setup and want to share the results?

    I'm not interested in any drama as to whos setup is better, just hoping to get an idea of real world results for turbo setups on these engines

    Thanks!

  11. #9
    Big Timer!!! 9thgensifamily's Avatar
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    Borg Warner EFR 7064. 360whp was made at 8 PSI falling to 6 PSI at redline. Bearings broke in on turbo and holds 9PSI to redline now.
    I picked the EFR because I wanted to keep the car as quite as I could (internal waste gate), and it has a recirculating blow off valve built into it.

  12. #10
    One Bad Mama Jama!!! TenZen's Avatar
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    Quote Originally Posted by 9thgensifamily View Post
    Borg Warner EFR 7064. 360whp was made at 8 PSI falling to 6 PSI at redline. Bearings broke in on turbo and holds 9PSI to redline now.
    I picked the EFR because I wanted to keep the car as quite as I could (internal waste gate), and it has a recirculating blow off valve built into it.
    What?! That's like paying a hot ass stripper to keep her clothes on! I just wanted to say that.
    H82LOS3 likes this.
    2015 Rallye Red Si Coupe
    Acuity Curl CAI, Hasport Torque Mount & Rear Motor Mount, Acuity Shift Linkage & Shifter Base Bushings, Acuity ESCO Shift Knob, BFGoodrich g-Force COMP-2 A/S, FKX RSB/LTB, SiriMoto FSB/RLTB, Full Race Cat-Back, RV6 Catted DP

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