BRP "hedder" dyno / track updates

Discussion in 'High Tech Retrofits' started by 1st and goal, Sep 20, 2008.

  1. 1st and goal

    1st and goal Veteran Member

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    Well boys and girls the dyno results are in :)

    On Thursday I went to the dyno and tweaked the tune slightly to accomodate for the "Hedders" as Hedman spells them.

    I went with 1 3/4 long tubes, they are made by Hedman and sold through BRP Hot rods.

    The motor is from a 98 Z/28 and has an LS6 intake manifold and comp cams camshaft, springs and pushrods. Otherwise the motor is stock. Tranny is a 4L60E w/ Vigilante t/c.

    I did three baseline dyno pulls with exhaust manifolds and the first one was 322 @ 5850, the next pull was 312 and after letting the car cool I backed it up with another 322 RWHP pull.

    On to the "Hedder" dyno pulls :bowtie:

    On the first pull we only spun it up to 5700 and it made 338, we tweaked the tune a bit and it ran it up to 6200ish and it made 355.9 RWHP @ 6150 and torque went up from 273.8 to 304 @ the same 6150 rpm. Peak torque was 327 @ 5200, the previous peak torque was 303 @ 5200

    I backed up the 355RWHP run with another 355 RWHP pull and spun it up to 6500. HP remained at 355, it flatlined from 6150-6500 @ 355.

    [​IMG]

    [​IMG]

    Of course with new found power a trip to my local track (New England Dragway) was required so off I went last night to make a couple of passes

    My previous best was 12.730 @ 106.39, other pases that day was 12.781 @ 106.14, 12.794 @ 105.92 and 12.757 @ 105.55. Sixty foot times ranged from 1.821 - 1.848 on the above passes.

    With the increase in power my sixty foot times improved to 1.782 1.792 and 1.755.

    First pass I cut a .080 light and my sixty foot was 1.782, 7.842 @ 88.03 in the eight and then I bounced off the rev limiter a couple of times and as I ran thought the lights I looked up and saw 12.330 (well actually I only saw the 33) but you get the gist... so it was a 12.330 @ 109.60, next pass I red light by a c/h (.004) and sixty footed to a 1.792 and ran 12.384 @ 109.26 with again bouncing off the rev limited on the 2-3 shift. I decided to give it one more shot before I left and cut a 1.755 sixty foot (.102 light) and ran 7.790 @ 88.62 and again as I go through the lights I crouch down and lookup and saw a "25" :bowtie: , drive around and get my slip and it's a 12.256 @ 109.96 with again bouncing off the rev limiter twice before it shifted into third. My buddy has the laptop with EFI live so at the time I was stuck and couldnt' make any changes.

    Bottom line I picked 34 RWHP, 30 RWTQ on the dyno and a solid 3+ mph and almost a half second at the track.

    These "Hedders" are by far one of the best investments I made as far as dollar vs. performance gain.

    Uncle Marc
     
    Last edited: Sep 20, 2008
  2. 1st and goal

    1st and goal Veteran Member

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    I was able to export the table into excel so I could do a chart, not sure how it will come out but here goes....

    EDIT - OK it looks linda ugly, if you go from left to right its rpm, HP with hedders, hp with manifolds, change in hp, torque with hedders, torque with manifolds and torque change.

    RPM Hp Headers Hp manifolds Change Torque (ft-lb) Headers Torque (ft-lb) manifolds Change
    4150 235.3 227.2 8.1 297.2 287.3 9.9
    4200 246.6 230.1 16.5 308.1 287.6 20.5
    4250 252.2 232.7 19.5 311.5 287.6 23.9
    4300 255.1 235.1 20 311.5 287.2 24.3
    4350 257.4 237.2 20.2 310.8 286.7 24.1
    4400 260 239.3 20.7 310.4 286.1 24.3
    4450 263.1 241.7 21.4 310.7 285.7 25
    4500 266.8 244.6 22.2 311.6 285.9 25.7
    4550 270.7 247.9 22.8 312.9 286.6 26.3
    4600 275 251.7 23.3 314.4 287.8 26.6
    4650 279.4 256 23.4 316 289.4 26.6
    4700 284 260.7 23.3 317.7 291.5 26.2
    4750 288.7 265.4 23.3 319.6 293.5 26.1
    4800 293.5 270.2 23.3 321.4 295.6 25.8
    4850 298.2 274.9 23.3 323 297.5 25.5
    4900 302.7 279.1 23.6 324.4 299.1 25.3
    4950 306.7 283.2 23.5 325.3 300.4 24.9
    5000 310.4 287.1 23.3 325.9 301.5 24.4
    5050 314 290.8 23.2 326.4 302.4 24
    5100 317.3 294.3 23 326.7 303 23.7
    5150 320.6 297.6 23 326.9 303.4 23.5
    5200 323.9 300.6 23.3 327.1 303.6 23.5
    5250 327.1 303.6 23.5 327.2 303.6 23.6
    5300 330.3 306.3 24 327.2 303.5 23.7
    5350 333.2 308.9 24.3 327.1 303.2 23.9
    5400 335.9 311.3 24.6 326.7 302.6 24.1
    5450 338.4 313.3 25.1 326 301.9 24.1
    5500 340.5 315.1 25.4 325.2 300.8 24.4
    5550 342.5 316.5 26 324.1 299.6 24.5
    5600 344.3 317.8 26.5 322.9 298.2 24.7
    5650 345.9 319 26.9 321.5 296.5 25
    5700 347.4 320.1 27.3 320.1 294.8 25.3
    5750 348.8 320.9 27.9 318.6 293.1 25.5
    5800 350.2 321.5 28.7 317 291.1 25.9
    5850 351.3 321.8 29.5 315.4 288.9 26.5
    5900 352.4 321.7 30.7 313.7 286.4 27.3
    5950 353.3 321.3 32 312 283.6 28.4
    6000 354.1 320.8 33.3 310.1 280.9 29.2
    6050 354.9 320.5 34.4 308 278.3 29.7
    6100 355.5 320.4 35.1 306.1 275.9 30.2
    6150 355.9 320.6 35.3 304 273.8 30.2
    6200 355.3 321 34.3 301 271.9 29.1
    AVG 312.8 287.9 25.0 317.5 292.3 25.1
     
  3. Zedzag

    Zedzag Veteran Member

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    Great gains! Thanks for sharing the results. I hope my 6.0 will do the same.
     
  4. 1st and goal

    1st and goal Veteran Member

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    No problem ;)

    The headers and tweaking the tune were the only changes between the before and after results. I merged the headers into my existing 2½ true dual exhaust (Flowmaster mufflers)
     
  5. ErikNORCAL

    ErikNORCAL Veteran Member

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    awesome info!
     
  6. BonzoHansen

    BonzoHansen Administrator Lifetime Gold Member

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    ;) nice.

    Code:
    	HP			Torque (ft-lb)		
    RPM	Hdrs	Mnflds	Change	Hdrs	Mnflds	Change
    4150	235.3	227.2	8.1	297.2	287.3	9.9
    4200	246.6	230.1	16.5	308.1	287.6	20.5
    4250	252.2	232.7	19.5	311.5	287.6	23.9
    4300	255.1	235.1	20.0	311.5	287.2	24.3
    4350	257.4	237.2	20.2	310.8	286.7	24.1
    4400	260.0	239.3	20.7	310.4	286.1	24.3
    4450	263.1	241.7	21.4	310.7	285.7	25.0
    4500	266.8	244.6	22.2	311.6	285.9	25.7
    4550	270.7	247.9	22.8	312.9	286.6	26.3
    4600	275.0	251.7	23.3	314.4	287.8	26.6
    4650	279.4	256.0	23.4	316.0	289.4	26.6
    4700	284.0	260.7	23.3	317.7	291.5	26.2
    4750	288.7	265.4	23.3	319.6	293.5	26.1
    4800	293.5	270.2	23.3	321.4	295.6	25.8
    4850	298.2	274.9	23.3	323.0	297.5	25.5
    4900	302.7	279.1	23.6	324.4	299.1	25.3
    4950	306.7	283.2	23.5	325.3	300.4	24.9
    5000	310.4	287.1	23.3	325.9	301.5	24.4
    5050	314.0	290.8	23.2	326.4	302.4	24.0
    5100	317.3	294.3	23.0	326.7	303.0	23.7
    5150	320.6	297.6	23.0	326.9	303.4	23.5
    5200	323.9	300.6	23.3	327.1	303.6	23.5
    5250	327.1	303.6	23.5	327.2	303.6	23.6
    5300	330.3	306.3	24.0	327.2	303.5	23.7
    5350	333.2	308.9	24.3	327.1	303.2	23.9
    5400	335.9	311.3	24.6	326.7	302.6	24.1
    5450	338.4	313.3	25.1	326.0	301.9	24.1
    5500	340.5	315.1	25.4	325.2	300.8	24.4
    5550	342.5	316.5	26.0	324.1	299.6	24.5
    5600	344.3	317.8	26.5	322.9	298.2	24.7
    5650	345.9	319.0	26.9	321.5	296.5	25.0
    5700	347.4	320.1	27.3	320.1	294.8	25.3
    5750	348.8	320.9	27.9	318.6	293.1	25.5
    5800	350.2	321.5	28.7	317.0	291.1	25.9
    5850	351.3	321.8	29.5	315.4	288.9	26.5
    5900	352.4	321.7	30.7	313.7	286.4	27.3
    5950	353.3	321.3	32.0	312.0	283.6	28.4
    6000	354.1	320.8	33.3	310.1	280.9	29.2
    6050	354.9	320.5	34.4	308.0	278.3	29.7
    6100	355.5	320.4	35.1	306.1	275.9	30.2
    6150	355.9	320.6	35.3	304.0	273.8	30.2
    6200	355.3	321.0	34.3	301.0	271.9	29.1
    AVG	312.8	287.9	25.0	317.5	292.3	25.1
     

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  7. 1st and goal

    1st and goal Veteran Member

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    Timeslips :bowtie: :) :bowtie:

    [​IMG]
     
  8. 1970camaroRS

    1970camaroRS Veteran Member

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    Now all you have to do is put a cam in that thing!
     
  9. 1st and goal

    1st and goal Veteran Member

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    Thanks but it does have a Comp cams cam, I believe I listed that in one of the above posts. Next mod will be some heads, then we're talking solid 11's at 115ish :bowtie:
     
  10. Mizzouri

    Mizzouri Member

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    What's the weight of this car? Nice times for the mods done!
     

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