Forged Performance: SPOHN's Custom FP Spec 4-Point Cage

ChadB@Forged · 02-07-2012, 10:19 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!

Quote:

Originally Posted by XwChriswX

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, 07:58 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, 08:12 PM

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

SPOHN · 02-09-2012, 08:48 PM

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

XwChriswX · 02-10-2012, 01:55 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, 10:53 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 · 02-14-2012, 12:37 AM

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

SPOHN · 02-14-2012, 09:37 AM

Quote:

Originally Posted by KingZee

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

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, 01:28 PM

Quote:

Originally Posted by SPOHN

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.

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

Sharif@Forged · 02-16-2012, 07:34 AM

Quote:

Originally Posted by wstar

@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

02-08-2012, 07:58 AM	#17 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	I should have my paint tomorrow. Still have a lot of masking off to do. That's going to be the pain. __________________

02-09-2012, 08:48 PM	#19 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 45 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	The loops are to keep your harnesses in place for it won't allow them to slide any. __________________

02-10-2012, 01:55 AM	#20 (permalink)
XwChriswX WFLYIDNNE Join Date: Jul 2009 Location: In The Fastlane Posts: 50,648 Drives: 02 GDB WRX Rep Power: 452	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. __________________ Bonnie - Stage 2, Audio build coming this fall! R.I.P. Abby 3/29/10 - 3/30/14

02-10-2012, 10:53 AM	#21 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3594	@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 __________________ 7AT Track Car! Journal thread / Car setup details

02-14-2012, 12:37 AM	#22 (permalink)
KingZee A True Z Fanatic Join Date: Feb 2010 Location: Glendale, CA Age: 41 Posts: 2,612 Drives: Focus ST Rep Power: 423	Good sht dude, nice to see someone that's not fcking around lol __________________ Focus ST

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