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Thread: How much does your 1JZ breath under boost?

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    Default How much does your 1JZ breath under boost?

    Please refer to the other sticky for links where the credit is due . I will list different figures for the STOCK BORE 1JZ engine as that is what most people who have one are using. Information on the bore and stroke of the 1JZ was gathered through a SEARCH that took 10 seconds. The numbers where found in this link and the link to another site provided therein: http://www.supramania.com/forums/sho...ore+stroke+1jz

    If you would like an overbore equation made up, please PM me with the bore of the aftermarket piston and link to the info on it to back up the proof .


    10psi (1.68027210884)


    RPM -------- NA ---------- TURBO CFM ------- lb/min
    ---------------- STOCK BORE 1JZ
    ---------- 152 Cid -------- 1.680272109 ---- 14.472

    2500 ---- 87.96296296 ---- 147.8017133 ---- 10.21294315
    2750 ---- 96.75925926 ---- 162.5818846 ---- 11.23423747
    3000 ---- 105.5555556 ---- 177.3620559 ---- 12.25553178
    3250 ---- 114.3518519 ---- 192.1422273 ---- 13.2768261
    3500 ---- 123.1481481 ---- 206.9223986 ---- 14.29812041
    3750 ---- 131.9444444 ---- 221.7025699 ---- 15.31941473
    4000 ---- 140.7407407 ---- 236.4827412 ---- 16.34070904
    4250 ---- 149.5370370 ---- 251.2629126 ---- 17.36200336
    4500 ---- 158.3333333 ---- 266.0430839 ---- 18.38329767
    4750 ---- 167.1296296 ---- 280.8232552 ---- 19.40459199
    5000 ---- 175.9259259 ---- 295.6034266 ---- 20.4258863
    5250 ---- 184.7222222 ---- 310.3835979 ---- 21.44718062
    5500 ---- 193.5185185 ---- 325.1637692 ---- 22.46847493
    5750 ---- 202.3148148 ---- 339.9439405 ---- 23.48976925
    6000 ---- 211.1111111 ---- 354.7241119 ---- 24.51106356
    6250 ---- 219.9074074 ---- 369.5042832 ---- 25.53235788
    6500 ---- 228.7037037 ---- 384.2844545 ---- 26.55365219
    6750 ---- 237.5000000 ---- 399.0646258 ---- 27.57494651
    7000 ---- 246.2962963 ---- 413.8447972 ---- 28.59624082
    7250 ---- 255.0925926 ---- 428.6249685 ---- 29.61753514
    7500 ---- 263.8888889 ---- 443.4051398 ---- 30.63882945
    7750 ---- 272.6851852 ---- 458.1853112 ---- 31.66012377
    8000 ---- 281.4814815 ---- 472.9654825 ---- 32.68141808
    8250 ---- 290.2777778 ---- 487.7456538 ---- 33.7027124
    8500 ---- 299.0740741 ---- 502.5258251 ---- 34.72400671


    13psi (1.88435374149)


    RPM -------- NA ---------- TURBO CFM ------- lb/min
    ---------------- STOCK BORE 1JZ
    ---------- 152 Cid -------- 1.884353741 ---- 14.472

    2500 ---- 87.96296296 ---- 165.7533384 ---- 11.45338159
    2750 ---- 96.75925926 ---- 182.3286722 ---- 12.59871975
    3000 ---- 105.5555556 ---- 198.9040060 ---- 13.74405791
    3250 ---- 114.3518519 ---- 215.4793399 ---- 14.88939607
    3500 ---- 123.1481481 ---- 232.0546737 ---- 16.03473423
    3750 ---- 131.9444444 ---- 248.6300076 ---- 17.18007239
    4000 ---- 140.7407407 ---- 265.2053414 ---- 18.32541054
    4250 ---- 149.5370370 ---- 281.7806752 ---- 19.4707487
    4500 ---- 158.3333333 ---- 298.3560091 ---- 20.61608686
    4750 ---- 167.1296296 ---- 314.9313429 ---- 21.76142502
    5000 ---- 175.9259259 ---- 331.5066767 ---- 22.90676318
    5250 ---- 184.7222222 ---- 348.0820106 ---- 24.05210134
    5500 ---- 193.5185185 ---- 364.6573444 ---- 25.1974395
    5750 ---- 202.3148148 ---- 381.2326783 ---- 26.34277766
    6000 ---- 211.1111111 ---- 397.8080121 ---- 27.48811582
    6250 ---- 219.9074074 ---- 414.3833459 ---- 28.63345398
    6500 ---- 228.7037037 ---- 430.9586798 ---- 29.77879213
    6750 ---- 237.5000000 ---- 447.5340136 ---- 30.92413029
    7000 ---- 246.2962963 ---- 464.1093474 ---- 32.06946845
    7250 ---- 255.0925926 ---- 480.6846813 ---- 33.21480661
    7500 ---- 263.8888889 ---- 497.2600151 ---- 34.36014477
    7750 ---- 272.6851852 ---- 513.8353490 ---- 35.50548293
    8000 ---- 281.4814815 ---- 530.4106828 ---- 36.65082109
    8250 ---- 290.2777778 ---- 546.9860166 ---- 37.79615925
    8500 ---- 299.0740741 ---- 563.5613505 ---- 38.94149741


    15psi (2.02040816326)


    RPM -------- NA ---------- TURBO CFM ------- lb/min
    ---------------- STOCK BORE 1JZ
    ---------- 152 Cid -------- 2.020408163 ---- 14.472

    2500 ---- 87.96296296 ---- 177.7210884 ---- 12.28034055
    2750 ---- 96.75925926 ---- 195.4931973 ---- 13.5083746
    3000 ---- 105.5555556 ---- 213.2653061 ---- 14.73640866
    3250 ---- 114.3518519 ---- 231.0374150 ---- 15.96444271
    3500 ---- 123.1481481 ---- 248.8095238 ---- 17.19247677
    3750 ---- 131.9444444 ---- 266.5816327 ---- 18.42051082
    4000 ---- 140.7407407 ---- 284.3537415 ---- 19.64854488
    4250 ---- 149.5370370 ---- 302.1258503 ---- 20.87657893
    4500 ---- 158.3333333 ---- 319.8979592 ---- 22.10461299
    4750 ---- 167.1296296 ---- 337.6700680 ---- 23.33264704
    5000 ---- 175.9259259 ---- 355.4421769 ---- 24.5606811
    5250 ---- 184.7222222 ---- 373.2142857 ---- 25.78871515
    5500 ---- 193.5185185 ---- 390.9863946 ---- 27.01674921
    5750 ---- 202.3148148 ---- 408.7585034 ---- 28.24478326
    6000 ---- 211.1111111 ---- 426.5306122 ---- 29.47281732
    6250 ---- 219.9074074 ---- 444.3027211 ---- 30.70085137
    6500 ---- 228.7037037 ---- 462.0748299 ---- 31.92888543
    6750 ---- 237.5000000 ---- 479.8469388 ---- 33.15691948
    7000 ---- 246.2962963 ---- 497.6190476 ---- 34.38495354
    7250 ---- 255.0925926 ---- 515.3911565 ---- 35.61298759
    7500 ---- 263.8888889 ---- 533.1632653 ---- 36.84102165
    7750 ---- 272.6851852 ---- 550.9353741 ---- 38.0690557
    8000 ---- 281.4814815 ---- 568.7074830 ---- 39.29708976
    8250 ---- 290.2777778 ---- 586.4795918 ---- 40.52512381
    8500 ---- 299.0740741 ---- 604.2517007 ---- 41.75315787


    18psi (2.22448979591)


    RPM -------- NA ---------- TURBO CFM ------- lb/min
    ---------------- STOCK BORE 1JZ
    ---------- 152 Cid -------- 2.224489796 ---- 14.472

    2500 ---- 87.96296296 ---- 195.6727135 ---- 13.52077899
    2750 ---- 96.75925926 ---- 215.2399849 ---- 14.87285689
    3000 ---- 105.5555556 ---- 234.8072562 ---- 16.22493479
    3250 ---- 114.3518519 ---- 254.3745276 ---- 17.57701269
    3500 ---- 123.1481481 ---- 273.9417989 ---- 18.92909058
    3750 ---- 131.9444444 ---- 293.5090703 ---- 20.28116848
    4000 ---- 140.7407407 ---- 313.0763416 ---- 21.63324638
    4250 ---- 149.5370370 ---- 332.6436130 ---- 22.98532428
    4500 ---- 158.3333333 ---- 352.2108844 ---- 24.33740218
    4750 ---- 167.1296296 ---- 371.7781557 ---- 25.68948008
    5000 ---- 175.9259259 ---- 391.3454271 ---- 27.04155798
    5250 ---- 184.7222222 ---- 410.9126984 ---- 28.39363588
    5500 ---- 193.5185185 ---- 430.4799698 ---- 29.74571378
    5750 ---- 202.3148148 ---- 450.0472411 ---- 31.09779167
    6000 ---- 211.1111111 ---- 469.6145125 ---- 32.44986957
    6250 ---- 219.9074074 ---- 489.1817838 ---- 33.80194747
    6500 ---- 228.7037037 ---- 508.7490552 ---- 35.15402537
    6750 ---- 237.5000000 ---- 528.3163265 ---- 36.50610327
    7000 ---- 246.2962963 ---- 547.8835979 ---- 37.85818117
    7250 ---- 255.0925926 ---- 567.4508692 ---- 39.21025907
    7500 ---- 263.8888889 ---- 587.0181406 ---- 40.56233697
    7750 ---- 272.6851852 ---- 606.5854119 ---- 41.91441487
    8000 ---- 281.4814815 ---- 626.1526833 ---- 43.26649276
    8250 ---- 290.2777778 ---- 645.7199546 ---- 44.61857066
    8500 ---- 299.0740741 ---- 665.2872260 ---- 45.97064856


    20psi (2.36054421768)


    RPM -------- NA ---------- TURBO CFM ------- lb/min
    ---------------- STOCK BORE 1JZ
    ---------- 152 Cid -------- 2.360544218 ---- 14.472

    2500 ---- 87.96296296 ---- 207.6404636 ---- 14.34773795
    2750 ---- 96.75925926 ---- 228.4045100 ---- 15.78251174
    3000 ---- 105.5555556 ---- 249.1685563 ---- 17.21728554
    3250 ---- 114.3518519 ---- 269.9326027 ---- 18.65205933
    3500 ---- 123.1481481 ---- 290.6966490 ---- 20.08683313
    3750 ---- 131.9444444 ---- 311.4606954 ---- 21.52160692
    4000 ---- 140.7407407 ---- 332.2247417 ---- 22.95638072
    4250 ---- 149.5370370 ---- 352.9887881 ---- 24.39115451
    4500 ---- 158.3333333 ---- 373.7528345 ---- 25.82592831
    4750 ---- 167.1296296 ---- 394.5168808 ---- 27.2607021
    5000 ---- 175.9259259 ---- 415.2809272 ---- 28.6954759
    5250 ---- 184.7222222 ---- 436.0449735 ---- 30.13024969
    5500 ---- 193.5185185 ---- 456.8090199 ---- 31.56502349
    5750 ---- 202.3148148 ---- 477.5730663 ---- 32.99979728
    6000 ---- 211.1111111 ---- 498.3371126 ---- 34.43457108
    6250 ---- 219.9074074 ---- 519.1011590 ---- 35.86934487
    6500 ---- 228.7037037 ---- 539.8652053 ---- 37.30411867
    6750 ---- 237.5000000 ---- 560.6292517 ---- 38.73889246
    7000 ---- 246.2962963 ---- 581.3932981 ---- 40.17366626
    7250 ---- 255.0925926 ---- 602.1573444 ---- 41.60844005
    7500 ---- 263.8888889 ---- 622.9213908 ---- 43.04321385
    7750 ---- 272.6851852 ---- 643.6854371 ---- 44.47798764
    8000 ---- 281.4814815 ---- 664.4494835 ---- 45.91276144
    8250 ---- 290.2777778 ---- 685.2135299 ---- 47.34753523
    8500 ---- 299.0740741 ---- 705.9775762 ---- 48.78230903


    23psi (2.56462585034)


    RPM -------- NA ---------- TURBO CFM ------- lb/min
    ---------------- STOCK BORE 1JZ
    ---------- 152 Cid -------- 2.56462585 ---- 14.472

    2500 ---- 87.96296296 ---- 225.5920887 ---- 15.58817639
    2750 ---- 96.75925926 ---- 248.1512976 ---- 17.14699403
    3000 ---- 105.5555556 ---- 270.7105064 ---- 18.70581167
    3250 ---- 114.3518519 ---- 293.2697153 ---- 20.2646293
    3500 ---- 123.1481481 ---- 315.8289242 ---- 21.82344694
    3750 ---- 131.9444444 ---- 338.3881330 ---- 23.38226458
    4000 ---- 140.7407407 ---- 360.9473419 ---- 24.94108222
    4250 ---- 149.5370370 ---- 383.5065508 ---- 26.49989986
    4500 ---- 158.3333333 ---- 406.0657596 ---- 28.0587175
    4750 ---- 167.1296296 ---- 428.6249685 ---- 29.61753514
    5000 ---- 175.9259259 ---- 451.1841774 ---- 31.17635278
    5250 ---- 184.7222222 ---- 473.7433862 ---- 32.73517041
    5500 ---- 193.5185185 ---- 496.3025951 ---- 34.29398805
    5750 ---- 202.3148148 ---- 518.8618040 ---- 35.85280569
    6000 ---- 211.1111111 ---- 541.4210128 ---- 37.41162333
    6250 ---- 219.9074074 ---- 563.9802217 ---- 38.97044097
    6500 ---- 228.7037037 ---- 586.5394306 ---- 40.52925861
    6750 ---- 237.5000000 ---- 609.0986395 ---- 42.08807625
    7000 ---- 246.2962963 ---- 631.6578483 ---- 43.64689389
    7250 ---- 255.0925926 ---- 654.2170572 ---- 45.20571153
    7500 ---- 263.8888889 ---- 676.7762661 ---- 46.76452916
    7750 ---- 272.6851852 ---- 699.3354749 ---- 48.3233468
    8000 ---- 281.4814815 ---- 721.8946838 ---- 49.88216444
    8250 ---- 290.2777778 ---- 744.4538927 ---- 51.44098208
    8500 ---- 299.0740741 ---- 767.0131015 ---- 52.99979972


    25psi (2.7006802721)


    RPM -------- NA ---------- TURBO CFM ------- lb/min
    ---------------- STOCK BORE 1JZ
    ---------- 152 Cid -------- 2.700680272 ---- 14.472

    2500 ---- 87.96296296 ---- 237.5598387 ---- 16.41513535
    2750 ---- 96.75925926 ---- 261.3158226 ---- 18.05664888
    3000 ---- 105.5555556 ---- 285.0718065 ---- 19.69816242
    3250 ---- 114.3518519 ---- 308.8277904 ---- 21.33967595
    3500 ---- 123.1481481 ---- 332.5837742 ---- 22.98118949
    3750 ---- 131.9444444 ---- 356.3397581 ---- 24.62270302
    4000 ---- 140.7407407 ---- 380.0957420 ---- 26.26421656
    4250 ---- 149.5370370 ---- 403.8517259 ---- 27.90573009
    4500 ---- 158.3333333 ---- 427.6077097 ---- 29.54724363
    4750 ---- 167.1296296 ---- 451.3636936 ---- 31.18875716
    5000 ---- 175.9259259 ---- 475.1196775 ---- 32.8302707
    5250 ---- 184.7222222 ---- 498.8756614 ---- 34.47178423
    5500 ---- 193.5185185 ---- 522.6316452 ---- 36.11329776
    5750 ---- 202.3148148 ---- 546.3876291 ---- 37.7548113
    6000 ---- 211.1111111 ---- 570.1436130 ---- 39.39632483
    6250 ---- 219.9074074 ---- 593.8995969 ---- 41.03783837
    6500 ---- 228.7037037 ---- 617.6555807 ---- 42.6793519
    6750 ---- 237.5000000 ---- 641.4115646 ---- 44.32086544
    7000 ---- 246.2962963 ---- 665.1675485 ---- 45.96237897
    7250 ---- 255.0925926 ---- 688.9235324 ---- 47.60389251
    7500 ---- 263.8888889 ---- 712.6795162 ---- 49.24540604
    7750 ---- 272.6851852 ---- 736.4355001 ---- 50.88691958
    8000 ---- 281.4814815 ---- 760.1914840 ---- 52.52843311
    8250 ---- 290.2777778 ---- 783.9474679 ---- 54.16994665
    8500 ---- 299.0740741 ---- 807.7034517 ---- 55.81146018


    To calculate what diameter piping is best for your setup, plug in these numbers for the specific RPMs that you are curious about in this link: http://not2fast.com/gasflow/velocity.shtml

    For example: Let's say that the peak power of this specific 1JZ is around 6500 RPMs at 20 psi. Using an intake temp of 75 degrees and 2.5" piping, that will give you 263.9 ft/sec velocity with a psig of 0.57. You are reving the engin to 7250 RPM's in this specific setup so velocity is 294.3 ft/sec and psig is 0.72 with the 2.5" piping. A tip from a well respected member on here is to have a throttle body that is typically .5" larger than you intake piping since they do not flow the same as straight through piping. This is all assuming that 2.5" is the smallest piping comming of your turbo (s). There is still more room to grow with on the 2.5" piping in the 1JZ. Bumping boost up to 23psi will yeild 286.7 ft/sec at 6500 RPM with a psig of 0.68, and the same sized piping, and 319.8 ft/sec at 7250 RPM. The threshold of critical velocity has been breached, but not by much. Notice that the psig is 0.84? Not bad, but it was starting to climb fast after passing 300 ft/sec.
    Last edited by starscream5000; May 10th, 2007 at 09:16 AM.
    Quote Originally Posted by Reign_Maker
    I can count on one hand the members of this site that I dont like... You're the middle finger...
    Quote Originally Posted by mibrum View Post
    I shift the gears at 9450rpm
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