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Thread: Tarrett Caliper Studs

  1. #21
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    Re: Tarrett Caliper Studs

    It may be that I didn't know the stud length and just guessed and got lucky.

    Looking at the pictures in an associated article to that post, it looks like his fit almost flush.

    https://www.planet-9.com/reviews/cay...per-studs.html

    Mine definitely have threads protruding from the nut end by probably about 7-8mm after torquing. (I don't know exactly. I'll check and take a picture when I put my track pads on for this weekend).

    This would be consistent with what others said. If they use 85mm bolts they would not be able to (or barely be able to) thread the nut all the way on.
    2014 Boxster S - Racing Yellow, Sport Chrono, PASM, PTV, PDK, 3rd radiator, Cobb Stage 1 tune (Pagid RSL29's & Nitto NT-01's on the track)

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  3. #22
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    Re: Tarrett Caliper Studs

    A good rule of thumb regarding minimum bolt [or stud] protrusion Is the equivalent of two full thread lengths should protrude through the end of a nut after the nut is fully torqued. For example, a 1/4"-20 bolt would have 20 threads/inch, so the equivalent length of two threads is 2x 1/20" = 1/10". The rationale is that the end of the bolt is beveled or chamfered, and the first thread beyond it is imperfect. So, using this rule of thumb insures that all of the nut's threads are engaged with complete bolt threads.
    Also, IMO, the stud should bottom in the blind hole and then be torqued to spec, to preload the stud and lock it in place. Otherwise, Loctite is the only thing preventing the studs from backing out when removing the nuts.

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    Re: Tarrett Caliper Studs

    The salesperson at Tarret recommended 85 mm to me. Now I know to buy 95 mm.

    And that buying 85 mm and not seating them fully just to gain some stud protrusion is ill-advised. My instinct was confirmed.

    We are all in this together. I have learned something here. Maybe others have too. Most of all, I hope that Tarret has.

    It is really good practice just to LOOK at things and think.
    Last edited by dcharnet; 06-05-2019 at 09:37 PM.
    '14 BS/MT/X73/ 20" MPSS/ Sports Chrono/ Softronic ECU Flash/FVD Brombacher "Sound" Catback/ Numeric Short Shifter/ Fabspeed rear chassis brace/ Soul Catless Comp Headers with Jet-Hot Ceramic Coating Inside/ Out.

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    Re: Tarrett Caliper Studs

    Quote Originally Posted by ledbette View Post
    It may be that I didn't know the stud length and just guessed and got lucky.

    Looking at the pictures in an associated article to that post, it looks like his fit almost flush.

    https://www.planet-9.com/reviews/cay...per-studs.html

    Mine definitely have threads protruding from the nut end by probably about 7-8mm after torquing. (I don't know exactly. I'll check and take a picture when I put my track pads on for this weekend).

    This would be consistent with what others said. If they use 85mm bolts they would not be able to (or barely be able to) thread the nut all the way on.
    Some really good pictures in that link. Note in the picture with the studs next to the bolt that the studs are clearly shorter by several mm. Interesting. Well, I'll see how the 95mm go for me. I look forward to seeing your pictures and will post some of my own if they add any value.

    The question that DOES remain in my mind is whether or not I could have saved a bunch of $ by going to the vendor the guy who posted those pictures went to (and perhaps ordered a bit longer studs).

    Lastly, that MaxJax looks awesome. I'd prefer a full-height lift, but, given my low-ceiling garage, I'll take a set of these. What's $2200 among friends? That price is a large percentage of what full-height options go for. Interesting.
    "Let him who thinks he stands take heed lest he fall."

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    Re: Tarrett Caliper Studs

    Quote Originally Posted by dcharnet View Post
    The salesperson at Tarret recommended 85 mm to me. Now I know to buy 95 mm.

    And that buying 85 mm and not seating them fully just to gain some stud protrusion is ill-advised. My instinct was confirmed.

    We are all in this together. I have learned something here. Maybe others have too. Most of all, I hope that Tarret has.

    It is really good practice just to LOOK at things and think.

    I'd call Tarett and ask to talk to Ira. I'm sure he would work with you to solve your situation. I'll also point him to this thread.
    "Let him who thinks he stands take heed lest he fall."

  8. #26
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    Re: Tarrett Caliper Studs

    Thanks. My solution is to self-engineer and insist on longer studs than they recommend. Then their product makes sense. Caveat emptor.
    Last edited by dcharnet; 06-07-2019 at 06:36 PM.
    '14 BS/MT/X73/ 20" MPSS/ Sports Chrono/ Softronic ECU Flash/FVD Brombacher "Sound" Catback/ Numeric Short Shifter/ Fabspeed rear chassis brace/ Soul Catless Comp Headers with Jet-Hot Ceramic Coating Inside/ Out.

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    Re: Tarrett Caliper Studs

    I mentioned previously about the GT3 studs available from PMNA ($95). I went and measured the bolts and they are approximately 94 mm. The important thing to note is that to properly seat them means backing off at least two full circles to get the nut seated properly. Here is a photo with a ruler to show measurements. Hope this helps.
    Tarrett Caliper  Studs-img_2574-jpg

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    Re: Tarrett Caliper Studs

    OK, here we go. I received the 95mm studs from Tarett last Friday and installed them that evening. Note that 1) the stock pins/bolts are around 97mm long not 95mm and 2) the Tarett "95mm" studs are about 110mm long (you can see that the studs in this case come with thread lock pre-applied). I chatted again with Ira at Tarett and he said the mm designation didn't reflect the actual length of the stud, but the size of the application bolt it was replacing. I consider 97 close enough to 95 to corroborate what Ira said. I've attached 6 pictures (I guess the max I can attach to a post) of the 10 I took. "Stud Size Comparison" shows the studs relative to the stock bolts. "Dry Fit" I, II, and III show how things look on each end of the stud when inside the caliper, if the stud only bottomed out in the aluminum wheel housing (or whatever it's called) to the end of the threads. As you can see, there is left a LOT of non-threaded space on the nut end of the stud, which obviously would be very bad. However, as you can see in "Bottomed Out 5ft-lb", the stud bottoms out in the housing MUCH farther than the thread depth (thankfully). "Fully Seated w-Washer Top" shows how things looked as I waited for the thread cement to set but had slid the calipers over the studs and added the washers. I'll finish this with a second post to get the other 4 pictures and explain them. Apologies for the poor photos. I was in a bit of a hurry and it's hard to get the iPhone to set the focus when the phone is facing away from you...😒 I also take no credit/blame for how the forum tool rotated my pictures, ALL of which got badly flipped around when attached. 😢





    Tarrett Caliper  Studs-dry-fit-ii-jpgTarrett Caliper  Studs-dry-fit-i-jpgTarrett Caliper  Studs-stud-size-compare-jpgTarrett Caliper  Studs-fully-seated-w-washer-top-jpgTarrett Caliper  Studs-bottomed-out-5ft-lb-jpgTarrett Caliper  Studs-dry-fit-iii-jpg
    "Let him who thinks he stands take heed lest he fall."

  11. #29
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    Re: Tarrett Caliper Studs

    The rest of the story...

    Four more pix attached. "Fully Seated w-Washer Bottom" shows the other stud and the exposed threads above the washer. "Done w-54 ft-lb, Bottom, Top" show the finished result and the substantial number of threads beyond the nut after torquing them down to the specified 54 ft-lbs.

    Overall, I think the "85mm" (not a typo) stud set should probably be another 5-10mm longer than they are. These "95mm" studs (110mm actual length) are almost too long, but still work well when fully torqued down in the housing. I intend to pass this info on to Ira at Tarett.

    Thus ends my report from the field. I hope it was somewhat helpful.



    Tarrett Caliper  Studs-done-bottom-jpgTarrett Caliper  Studs-done-top-jpgTarrett Caliper  Studs-fully-seated-w-washer-bottom-jpgTarrett Caliper  Studs-done-w-54-ft-lb-jpg
    "Let him who thinks he stands take heed lest he fall."

  12. #30
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    Re: Tarrett Caliper Studs

    Tarrett Caliper  Studs-862df4a6-82f7-476d-96a2-9fada2d8d52a-jpgTarrett Caliper  Studs-862df4a6-82f7-476d-96a2-9fada2d8d52a-jpg

    This was what prompted the post in the first place
    '14 BS/MT/X73/ 20" MPSS/ Sports Chrono/ Softronic ECU Flash/FVD Brombacher "Sound" Catback/ Numeric Short Shifter/ Fabspeed rear chassis brace/ Soul Catless Comp Headers with Jet-Hot Ceramic Coating Inside/ Out.

  13. #31
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    Re: Tarrett Caliper Studs

    Quote Originally Posted by dcharnet View Post
    Tarrett Caliper  Studs-862df4a6-82f7-476d-96a2-9fada2d8d52a-jpgTarrett Caliper  Studs-862df4a6-82f7-476d-96a2-9fada2d8d52a-jpg

    This was what prompted the post in the first place
    Yeah, I recommended to Ira at Tarett that they add a few threads/mm to the length of the "85mm" solution.
    "Let him who thinks he stands take heed lest he fall."

  14. #32
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    Re: Tarrett Caliper Studs

    Quote Originally Posted by peloton View Post
    Some really good pictures in that link. Note in the picture with the studs next to the bolt that the studs are clearly shorter by several mm. Interesting. Well, I'll see how the 95mm go for me. I look forward to seeing your pictures and will post some of my own if they add any value.

    The question that DOES remain in my mind is whether or not I could have saved a bunch of $ by going to the vendor the guy who posted those pictures went to (and perhaps ordered a bit longer studs).

    Lastly, that MaxJax looks awesome. I'd prefer a full-height lift, but, given my low-ceiling garage, I'll take a set of these. What's $2200 among friends? That price is a large percentage of what full-height options go for. Interesting.
    Following this just for reference when I eventually need new pads on my CGTS. However, I too have a MaxJax and LOVE it. I get emails from Dannmar regularly with a sale price of around $1800 for the basic MaxJax like I have. The newer one with the locking detents (M6?) is closer to the $2200 your quote, and were it available when I bought mine I would have gone that route. I just install the safety bars once I reach max height and let the arms down on the bars to relieve pressure, my car sat on it for over a week one time while waiting for parts for my clutch R&R(previous 987 CS). Best money I've ever spent on a car-related tool.

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    Re: Tarrett Caliper Studs

    Update on the MaxJax, I received an email from Dannmar today(no affiliation whatsoever) and the MaxJax is on sale for $1699 delivered right now.

    https://www.maxjaxusa.com/buy-purcha...kp8qKN16Ec3wyr

    Significantly less than I paid for mine several years ago.

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