Lemons Mk2 Build - Page 118

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  1. #1171
    CelicaSupra.com Member SupraFiend's Avatar
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    Got a real dyno sheet?
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  3. #1172
    CelicaSupra.com Member revvhappy's Avatar
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    What do you mean by "real"? The car made about 60 pulls across 3 days of tuning but someone had messed up the graph axis markings. The numbers for peak tq and HP were 140 and 180 at the axles. I believe there's something wrong because this engine is supposed to pump out 150+ lb-ft of torque from 2500rpm and not have a dip in the curve. Still trying to track down the issue (checked cam timing, VTEC, VTC angles, compression, plugs).

  4. #1173
    CelicaSupra.com Member BillyM's Avatar
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    That thing sounds so wrong but I love it! ...looking forward to seeing how the car does for you without that extra 150 pounds on the nose!

    --billyM
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  6. #1174
    CelicaSupra.com Member revvhappy's Avatar
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    Quote Originally Posted by BillyM View Post
    That thing sounds so wrong but I love it! ...looking forward to seeing how the car does for you without that extra 150 pounds on the nose!

    --billyM
    I'm going to miss the smooth I-6 sound for sure! And the boatload of torque from low rpm.

  7. #1175
    CelicaSupra.com Member SupraFiend's Avatar
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    Quote Originally Posted by revvhappy View Post
    What do you mean by "real"? The car made about 60 pulls across 3 days of tuning but someone had messed up the graph axis markings. The numbers for peak tq and HP were 140 and 180 at the axles. I believe there's something wrong because this engine is supposed to pump out 150+ lb-ft of torque from 2500rpm and not have a dip in the curve. Still trying to track down the issue (checked cam timing, VTEC, VTC angles, compression, plugs).
    Like a printout with legible engine RPM numbers and Torque and HP figures on the sidebar so we can tell what we're looking at

    Thanks for the extra info, only the peak torque was listed on the screen photo. The computer read out at dyno shops is always missing a bunch of that info.

    Curious what this thing weighs now!
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  8. #1176
    CelicaSupra.com Member revvhappy's Avatar
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    No paper copy, but below is the final tune and graph (solid lines). The dyno was rebooted to get the numbers back to the correct scale. I have a track day scheduled for December 6th at Road Atlanta, a friend is bringing scales so I'll have the current weight soon. The only time it was weighed it came in at 2450 lb with all fluids but no driver. I would love to see a number under 2350. The mass is also more centralized with 95% of the engine weight behind the front wheel bearings, so the distribution should be much better.



    I've been scouring the internet for tuning information about the K24 and might have found a reason for the low torque at low rpm. The VTC (like Toyota VVT) is also supposed to be advanced on the low cam profile and we have the VTC set at 0 degrees until VTEC hits. I will try adding some cam advance at low rpm to see what happens.

  9. #1177
    CelicaSupra.com Member
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    Quote Originally Posted by revvhappy View Post

    I've been scouring the internet for tuning information about the K24 and might have found a reason for the low torque at low rpm.
    Did you find the "Honda" written on the engine?

  10. #1178
    CelicaSupra.com Member revvhappy's Avatar
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    Quote Originally Posted by Texasissouth View Post
    Did you find the "Honda" written on the engine?
    Bwah ha ha ... well played, sir!

    "For a Honda" this engine actually produces reasonable torque when the iVTEC systems are working properly (150-160 lb-ft from 2500rpm). It's not the monster 175 lb-ft of the 6MGE, but good enough for a race car.

  11. #1179
    CelicaSupra.com Member SupraFiend's Avatar
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    Yeah if you can fill in that big dip before 5000rpm it should be pretty respectable. Your curb weight is awesome, hundreds better then you could do with any Toyota inline 6, lets see if you can get your torque output up to those ranges! Thanks for posting a real graph!
    Black 86 mk2 Project Car
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  12. #1180
    CelicaSupra.com Member revvhappy's Avatar
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    Finally looking like a race car gain after almost 2 years of work.


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