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-   -   Forged Performance: SPOHN's Custom FP Spec 4-Point Cage (http://www.the370z.com/members-370z-gallery/49235-forged-performance-spohns-custom-fp-spec-4-point-cage.html)

ChadB@Forged 02-07-2012 09:19 AM

Thank you for all the comments Chris, I can't wait to see the cage once it is painted. I really like where you're going with the car dude, it is looking so sick! :tup:

Quote:

Originally Posted by XwChriswX (Post 1530105)

Also, since this is a full up weld-in kit, something because race car, is there something in development, or rather hopefully closer to production, for those not sponsored and not quite ready to go full race car?

Either a bolt in cage, or just a harness bar to replace the rear crossmember?

We are working on a lot of product development for 2012 for a few different vehicles including the 370Z. At this point I don't think we have plans for a production unit but if you guys are interested we might be able to do something for you. We do still have our NISMO that could be used for fab/test purposes.

SPOHN 02-08-2012 06:58 AM

I should have my paint tomorrow. Still have a lot of masking off to do. That's going to be the pain.

sixpax 02-09-2012 07:12 PM

Awesome ! What are the thin bars on top that look like two slots for ? Belts to pass through ?

SPOHN 02-09-2012 07:48 PM

The loops are to keep your harnesses in place for it won't allow them to slide any.

XwChriswX 02-10-2012 12:55 AM

I would love for at least a harness bar capable of actually being used, if not a full up cage. It looks great and will help with stability/restraint prior to a full cage being put in. I'd be interested in one for sure.

wstar 02-10-2012 09:53 AM

@Forged,

Do you mind if I pick your brains a little bit on the design here? I'm in a similar boat w/ Chris on current status/requirements and looking to put in a similar 4-point in the near future. Forged is a bit of a drive for me though (~13 hrs each way), so I'll probably use a local shop (undecided who yet). I've been trying to at least mostly sort through the design issues first on my own, so that I know what I'm talking about and what is or isn't acceptable when I start talking design with the shop (who I hope knows more than I do anyways, heh).

1) What was the logic on choosing this particular DOM size (1.75 x .095), does that just happen to hit a sweet spot for being legal for this car's usual class in a couple of different rule sets or other?

2) Is it possible to take the main hoop ends all the way to the lower floorboard as a design option when doing this, or does that just end up being a much weaker mountpoint than the obviously-strong spot you put them on that crossmember? Are there other pros/cons between those two spots, assuming the lower one is even viable?

3) What's the pros/cons on going with the harness bar offset to the rear like Chris's vs having it inline with the main hoop? I imagine your design is stronger (because in-line one of the two bars has to be cut and put back together), but is there more to this decision?

Oh and I guess (4) if you happen to know of a shop that's closer to Houston you'd recommend, I'd love to hear about it, would make my search easier :)

KingZee 02-13-2012 11:37 PM

Good sh*t dude, nice to see someone that's not f*cking around lol

SPOHN 02-14-2012 08:37 AM

Quote:

Originally Posted by KingZee (Post 1542693)
Good sh*t dude, nice to see someone that's not f*cking around lol

:bowrofl:

I hoping I'll have it painted tomorrow or Thursday at the lateset. The weather should be a lot warmer than it has been that last three days.

KingZee 02-14-2012 12:28 PM

Quote:

Originally Posted by SPOHN (Post 1542950)
:bowrofl:

I hoping I'll have it painted tomorrow or Thursday at the lateset. The weather should be a lot warmer than it has been that last three days.

:tup: can't wait to see it with some paint on it.

Sharif@Forged 02-16-2012 06:34 AM

Quote:

Originally Posted by wstar (Post 1536461)
@Forged,

Do you mind if I pick your brains a little bit on the design here? I'm in a similar boat w/ Chris on current status/requirements and looking to put in a similar 4-point in the near future. Forged is a bit of a drive for me though (~13 hrs each way), so I'll probably use a local shop (undecided who yet). I've been trying to at least mostly sort through the design issues first on my own, so that I know what I'm talking about and what is or isn't acceptable when I start talking design with the shop (who I hope knows more than I do anyways, heh).

1) What was the logic on choosing this particular DOM size (1.75 x .095), does that just happen to hit a sweet spot for being legal for this car's usual class in a couple of different rule sets or other?
Minimum tube diameter and wall thickness is mandated by the various road racing sanctioning bodies such as the SCCA, NASA, and Grand Am. We look at the final projected race weight and select the tubing accordingly. Vehicles that race at 2500lbs or greater require a minimum 1.75 X .095 tubing to be used.

2) Is it possible to take the main hoop ends all the way to the lower floorboard as a design option when doing this, or does that just end up being a much weaker mountpoint than the obviously-strong spot you put them on that crossmember? Are there other pros/cons between those two spots, assuming the lower one is even viable?
The cage is tied into the much stronger frame rail, rather than the floor board. You always should strive to anchor your cage to a frame rail or major chassis support structure.


3) What's the pros/cons on going with the harness bar offset to the rear like Chris's vs having it inline with the main hoop? I imagine your design is stronger (because in-line one of the two bars has to be cut and put back together), but is there more to this decision?

The main purpose is to have more seat travel, and more room to loop and angle your harnesses. We take a look at seat, and driver location, and many other factors before making the final decision. It's more work to do the angled harness bar but we think it's the right thing to do for maximum versatility.



Oh and I guess (4) if you happen to know of a shop that's closer to Houston you'd recommend, I'd love to hear about it, would make my search easier :)
Many of our customers live further away than you...come on down. :)

Answered inline above


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