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  1. #76
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    Click here to enlarge Originally Posted by dperf Click here to enlarge
    bigdnno98: You are correct. The turbo is a Tial spec HTA3586r. There is a lot left in this turbo. My guess is that it will easily make 650 on pump and on a Dynojet. I dont think 700+ is out of the question with additional octane and fuel volume. I want reliable power for road racing and on pump gas. The HPFP is getting close to being tapped out at 600whp on my setup.
    no meth?

    Click here to enlarge Originally Posted by Autobahn335i Click here to enlarge
    Interesting to read that you went with a single turbo setup for road racing. I would have suspected that turbo lag would be too much of an issue to make the car enjoyable and controllable at the track.
    E.g. get on the throttle at the apex and...wait for it...vtec kicks in a second later Click here to enlarge

    Curious about your thoughts on this and how it can be avoided Click here to enlarge
    the current fastest track (timeattack) cars are stroked 4cyl's running EFR9180's... as long as you're making enough power, the added potential difficulty in driving will be offset by extra speeds, with the right suspension/tire setup... HTA35 being smaller than a 9180 (which is closer to what.. GT40?) on a larger motor i'd think is fine spool/response wise haha

    Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
    Spool is usually a direct result of manifold design coupled with proper turbo choice, use the right manifold / turbo, keep exhaust gas velocity up, and you are rewarded with amazing spool, do a cookie cutter copy of all the other kits on the market, and expect the same marginal spool they are exhibiting. Its quite obvious whoever built this system paid close attention to the subtle nuances of manifold design and did a good job on it. When prototyping, manifold design is not always top priority as you are just seeing what fits, once you get down to production it should be focused on.
    i found a REALLY nice thread started by TK (Tony Knight), with fluid dynamics info from an engineer, on head design for turbo cars, with some discussion on manifold design

    will stick it over in advanced tech Click here to enlarge
    boop

  2. #77
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    No meth on my racecar. 93 pump only

  3. #78
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    Click here to enlarge Originally Posted by dperf Click here to enlarge
    No meth on my racecar. 93 pump only
    would you go E85 when HPFP stuff gets released?
    boop

  4. #79
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    Click here to enlarge Originally Posted by The Ghost Click here to enlarge
    There, I simplified things. There were a bunch of bullets. The cleaning, checking, leak, etc are all standard machine shop things.

    The only "parts" are valves, springs, guides, and retainers. The work is the ports and CC. I stand by $4k is a lot. But it's my opinion. Competition causes price to find its level.
    Not all valve jobs are equal. ;-) Our lead machinist has 50 years experience and our head guy came from a top machinist school and has quite a few years post graduation developing badass heads.

    http://www.racetechmag.com/videos/me...1-youtube.html

    Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
    $4k seems like a fair price to me considering the R&D and nonrecurring costs involved. If they were to make just a handful of these it might cost $10k each. If they sold thousands I'm sure it could be much less.

    Anyway, what is the lead time on getting one done? Do you have head cores there or does ours need to be sent in first?
    3-4 weeks lead time right now. Possibly quicker if received in the next week or so. I think I'm down to just 1 set of Ferrea components, will look in the AM. I sold the last N54 core head this week, but I can call around tomorrow and see what I find :-) There are a lot of turd N54 heads at the recyclers with smoked ledges and rockers.

  5. #80
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    I'd love to see some S65 head work... *hint* *hint*
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  6. #81
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    Click here to enlarge Originally Posted by Autobahn335i Click here to enlarge
    Is there potential for gains on a RB Turbos setup on 93 octane fuel, rev limit 7200 with Cobb?
    +1. I'd like to know this as well.
    Stuff

  7. #82
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
    This looks very nice. If you can't pay, don't play. They are a business. Not a charity. And being smart business people, I would certainly hope they would charge what the market will pay for it. If the market doesn't show demand, the price will reduce until their reward / hassle ratio deteriorates.

    Good Job VAC. I have been waiting years to see real headwork results. Now just to get a glimpse at some cam numbers.
    I'm personally into Toyotas and BMWs. Look at the prices of heads from Titan Motorsports or any proven specialist. Titan sells head work from $3,700 to $15,000. The 2JZGTE head is pretty simple when compared to the N54 head as well. Titan has been selling them since the late 90s. We just started selling these recently...

  8. #83
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    Click here to enlarge Originally Posted by Mike@VAC Click here to enlarge
    I'm personally into Toyotas and BMWs. Look at the prices of heads from Titan Motorsports or any proven specialist. Titan sells head work from $3,700 to $15,000. The 2JZGTE head is pretty simple when compared to the N54 head as well. Titan has been selling them since the late 90s. We just started selling these recently...
    +1
    Getting anything as thorough as something like this from an industry leader will always demand a hefty price. I live 45 minutes from Sonny Leonard's(www.Sonnysracingengines.com) and people are literally on a waiting list for his $70K street engines. The best costs what it does because of what goes into it.
    Click here to enlarge
    MOTIV750, MOTIV P-1000 PI, MOTIV/FUEL-IT! low pressure fuel system, AEM EMS/COBB AP, Aquamist HFS-3, ETS FMIC, SPEC stage 3+ clutch/SS flywheel, BC Racing coilovers and VMR wheels wrapped in Hankook RS3s.

  9. #84
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    6 out of 6 members liked this post. Yes Reputation No
    Lets be honest... we're always looking for some good quality head for cheap... haha Click here to enlarge
    Click here to enlarge
    FBO's. Spec S2+. E85.

  10. #85
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I'd love to see some S65 head work... *hint* *hint*
    you know you want to Click here to enlarge

    Click here to enlarge Originally Posted by rader1 Click here to enlarge
    +1
    Getting anything as thorough as something like this from an industry leader will always demand a hefty price. I live 45 minutes from Sonny Leonard's(www.Sonnysracingengines.com) and people are literally on a waiting list for his $70K street engines. The best costs what it does because of what goes into it.
    That's true.. VAC has a good name and genuinely makes good stuff, and charge accordingly

    I have a feeling my head may end up costing a touch over $4k inc parts, maybe up to $5k... hopefully no more... waiting on a quote response first though lol.

    those titan $15k heads are getting a bit ridiculous, literally fractions of a percent gain lol... near triple the price of their stage 4 even!
    boop

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    The work is definitely very nice but I'd like to see testing and pricing at lower stages. Some of the import shops I used to hang out at showed in their testing that most of the gains were made with just new valves and a proper valve job all the other stuff was minimal in comparison.
    2008 135i - Cobb AP, JB4 G5 w/2Step&FSB, MS DP's, Berk street exhaust, AMS IC, VTT Inlets, UR Intake, ER CP w/Tial BOV, Spec 3+ & Steel FW, CDV delete, Quaife LSD, DSS Axles, M3 control arms, M3 rear SF bushings, M3 Trans bushings, SS brake lines. Pics

  12. #87
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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    you know you want to
    Well I wouldn't mind revving to 9-9.5k
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  13. #88
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Well I wouldn't mind revving to 9-9.5k
    plus, if you plan on going turbos.... Click here to enlarge

    Click here to enlarge Originally Posted by brusk Click here to enlarge
    The work is definitely very nice but I'd like to see testing and pricing at lower stages. Some of the import shops I used to hang out at showed in their testing that most of the gains were made with just new valves and a proper valve job all the other stuff was minimal in comparison.


    yeah i'm not sure what's so secret squirrel about flow bench numbers :/.. not like it highlights the proprietary cuts/methodology and such.
    boop

  14. #89
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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    plus, if you plan on going turbos.... Click here to enlarge
    I do and I will.

    Anyway this is for the N54 head but @Mike@VAC if you guys have some s65 results I'd love to see them!
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  15. #90
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    1 out of 1 members liked this post. Yes Reputation No
    I would love to run E85 for the added octane and minimal effects with heat soak/ elevated iat's, but the HPFP just cant keep upClick here to enlarge

  16. #91
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    With the article... What's with 'no word on pricing' @Sticky - vac website says $4k

  17. #92
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    Click here to enlarge Originally Posted by Flinchy Click here to enlarge
    With the article... What's with 'no word on pricing' @Sticky - vac website says $4k
    Yeah VAC mentioned that in the thread so there you go. There was no way to know whether this particular head had upgrades as it was for a single turbo. Different valves, springs, whatever. We got a lot of supplement info after the initial post which is the beauty of comments.
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  18. #93
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Yeah VAC mentioned that in the thread so there you go. There was no way to know whether this particular head had upgrades as it was for a single turbo. Different valves, springs, whatever. We got a lot of supplement info after the initial post which is the beauty of comments.
    Page for stage 3 lists valves, springs, retainers thougg

    Didnt know you made the article so soon after post, my bad haha
    boop

  19. #94
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    i have a question on the stage 3 head re: valves

    are the intakes stock size and exhaust +.5mm in this head?
    boop

  20. #95
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    Wonder if this can be done for the N55 head? Intake is already 1 mm larger than N54 head.

  21. #96
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    Click here to enlarge Originally Posted by maxnix Click here to enlarge
    Wonder if this can be done for the N55 head? Intake is already 1 mm larger than N54 head.
    I see absolutely no reason why they can't apply this to the N55 head. They probably already have done an N55 head.
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