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new spec miata shock - penseke!

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  • gerglumuff
    started a topic new spec miata shock - penseke!

    new spec miata shock - penseke!

    https://www.mazdamotorsports.com/2018/08/14/14166/

    this will be great for us spec miata racers, but also for you guys too. should match well with STS spring rates, as a good budget option for autocross/hpde stuff too.
    Last edited by emiliorescigno; 08-15-2018, 08:30 AM.

  • haroldk
    replied
    I don't know what they're using for bushings, but could it be metal to metal followed shortly thereafter by tire to metal after bushing deflection?

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  • SUV-ETR
    replied
    Thanks for posting that. Clears up a lot, and makes it clear that this might be an good solution for non-SM's too.

    Though I have to say that this seems like a confusing statement:

    The reason a raised upper mount was not developed to increase rear suspension travel is because the rear upper control arm would have metal-to-metal contact with the rear subframe. Then, the tire would begin to contact the wheel well, limiting travel gains, but more importantly, causing damage to the tire.
    So...do you get metal-to-metal contact on the control arm, or tire-to-wheel-well contact? Either one of them should be a limiting factor...so which is it?

    My Penskes are out for rebuild with Guy Ankeny after four years of service. But when they come back, I'll have to compare lengths. I feel like they're shorter, but now I'm curious. I certainly don't have any metal-to-metal contact on the control arms or subframe, and I've taken fairly extreme measures to make tire-to-wheel-well interference a non-issue.

    Neal

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  • gerglumuff
    replied
    ordered mine.

    interesting tech bullitin on why the penske isn't shorter that much shorter: because the suspension can't actually move any farther if they made it any shorter: http://www.mazdamotorsports.com/wp-c...xplanation.pdf

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  • SUV-ETR
    replied
    Originally posted by gerglumuff View Post
    the rears are significantly shorter, the fronts are supposed to be too. huge improvement over the bilsteins, hopefully save us on tires and hubs/bearings.
    If that's true, that's awesome. But they sure don't look much/any shorter, based on those pictures. I assume the Bilstein in the comparison pics is an SM B6, not a B8. But maybe it is just an optical illusion from the camera angle?

    Originally posted by gerglumuff View Post
    gotta remember it isn't a 6 grand penske setup, its a 200 dollars a shock penske setup.
    Oh, absolutely. But the length of the body and shaft aren't things that would change the cost any. I assume most of the cost reduction is from no reservoirs, a much simpler (and not threaded) body in steel, no adjusters, and other features.

    The valve stack might be different, but the general shape of the dyno plots is very similar to my $$ shocks...which means that it might not be all that different. If the bodies are closer to a B8, it would make a pretty awesome street/autocross/HPDE option. Especially if they can be revalved! But if the bodies are the same length as a B6, well...that's IMHO a massively missed opportunity. They'd be mostly useless.

    Neal

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  • gerglumuff
    replied
    Originally posted by 4drcivicmaster View Post
    Some people in ES were looking into these.
    that seems ... aggressive. though the price is just so good, its probably worth a shot

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  • 4drcivicmaster
    replied
    Some people in ES were looking into these.

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  • gerglumuff
    replied
    Originally posted by SUV-ETR View Post
    Nice! Valving still not super aggressive, but better low-speed will help a lot. And there's actually SOME compression valving. LOL.

    A little disappointed to see the body/shaft pics tho. Looks like maybe only a very minor step in the right direction. Glad they moved the snap rings for the coilover sleeves a bit, at least. But really would have hoped for something a bit shorter. But that probably explains why the valving is still a bit on the soft side...bump stops will still be a critical thing.

    Neal
    one of the stated goals is actually to keep us off the bump stops, as thats why we kill our tires and hubs so fast. bump stops are shorter, but much firmer than the old spec miata ones. try and punish folks for running too low, and getting into the bump stops. its all spec for us, so disregard for STS/CSP use, but thats why we will be running short and hard stops with them.

    the rears are significantly shorter, the fronts are supposed to be too. huge improvement over the bilsteins, hopefully save us on tires and hubs/bearings.

    gotta remember it isn't a 6 grand penske setup, its a 200 dollars a shock penske setup. if i was getting into building a miata though, id certainly look at these long before anything else in the price range! and i think these will both perform better, with a faster and more consistent race car, and save me money on tires and hubs. like a lot of money.
    Last edited by gerglumuff; 12-03-2018, 02:41 PM.

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  • SUV-ETR
    replied
    Nice! Valving still not super aggressive, but better low-speed will help a lot. And there's actually SOME compression valving. LOL.

    A little disappointed to see the body/shaft pics tho. Looks like maybe only a very minor step in the right direction. Glad they moved the snap rings for the coilover sleeves a bit, at least. But really would have hoped for something a bit shorter. But that probably explains why the valving is still a bit on the soft side...bump stops will still be a critical thing.

    Neal

    Leave a comment:


  • gerglumuff
    replied
    dyno sheets are up on V2 motorsports FB page. hubba hubba

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  • JohnMoravec
    replied
    Thanks everyone. I'll look into the membership and keep in mind that they may not be available for me at first.

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  • SUV-ETR
    replied
    Originally posted by Adam777 View Post
    Keep in mind that you have to order these through Mazdaspeed so make sure your membership is up to date
    They do sell non-OEM parts on their website without being registered as a racer, so I'd expect these to (eventually, at least) be available to anyone. The racer registration is required if you want a discount on OEM parts.

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  • Adam777
    replied
    Keep in mind that you have to order these through Mazdaspeed so make sure your membership is up to date if you are non-SMer. Considering what it looks like the initial demand will be (AKA All SM cars), I would not be terribly surprises if they restricted this to just SM racers to start.

    Leave a comment:


  • SUV-ETR
    replied
    I wouldn't necessarily assume that stock shock hats would fit these shocks, or vice-versa. Depends on whether it is a spherical end to the shock (common in non-Miata shocks), or a bayonet mount shock with top hats that have a spherical bearing in the hat (what you usually see in a Miata).

    My Penskes have spherical ends on the shock, and I fabricated a custom hat. Considering they're less expensive, simpler, and more durable than bayonet mounts with a Miata-style hat, I wouldn't be surprised if that's what they do. In that case, you won't be able to put a stock-style hat on there.

    But in any case, no, I don't think this is a problem...unless you plan to drive it in the winter, where corrosion becomes a problem.

    Neal


    Attached Files
    Last edited by SUV-ETR; 08-16-2018, 09:41 AM.

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  • 767
    replied
    Originally posted by JohnMoravec View Post
    Oooh. There's a Miata in my garage that already has C1M wheels, and its shocks are on the way out. I bet these would go very nicely on it. I'm very excited to hear how they perform.

    Spherical bearings concern me though, as this is a street car. Would stock-style top hats keep them quiet enough for road trips?
    The noise floor of any Miata is so high that I wouldn't worry about them. I've never heard a peep out of my Xidas and I'm fairly sensitive/not tolerant of extra NVH.

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