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| Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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#1 |
| Post Whore! ![]() | Ultimate S13 seat fitment guide A bunch of members requested me to do this so don't flame me if the information already exists and/or not interesting. ================================== The stock S13 has 37.8" of headroom (source:Edmunds.com): 1990 Nissan 240SX specs, auto safety at Edmunds I measured the bottom of the seat to the headliner on my seafam green fastback with no sunroof and it appears to be about 37.5": The first thing you'll need to do is remove the seat. There are two (2) bolts on the front. Use a 14mm socket. And two (2) more in the back. Also 14mm. Pop out the plastic trim pieces to expose the bolt and nut. Tips: if you have problems with the bolts/nut, dab them with a little bit of PB Blaster and let soak. Use a breaker bar and apply gentle pressure. It's easy to strip the threads here so be careful. Install and remove bolts slowly. Try to hold the seat up to take the pressure of the bolts so you don't shear them on the seat rail. Remember to unplug the seatbelt sensor. Then bolt up the aftermarket rails using the stock bolts and nut. This is a Bride FG. Note the extra hole on the left rail. Apparently it's to fit the Skyline. This is the crucial part. I measured everything myself so dimensions are approximate. The rails come with brackets to bolt on to the side of the seat. They do have some adjustment. The biggest seat they can fit is about 16" outside width. You can also move the brackets in to accomodate a smaller seat. I have them set at the thinnest position possible and they appear to fit a seat with 15" outside width. Anything smaller or larger than 15-16" and you'll have to fabricate your own mounting brackets. I also measured the maximum height possible. The seat can go as low as possible until it hits the catalytic converter hump. The seat goes between the rails so there's nothing on the bottom of the rails to stop the seat (as stated by some of the members here). Basically you can go as low as you want until you hit the floor. I measured from the highest point of the floor, the cat hump, straight up to the headliner. It's about 36.5". As far as length goes, I suppose that anything that can fit between the steering wheel and the rear seat would work. So let's say using a Bride FG sidemount rail on a stock S13: 15-16" outside diameter. other sizes need custom brackets. You can squeeze something up to 17" but you'll lose about 1-2" of helmet clearance because the seat has to go over the rails and not between. Anything over 17" you'll have to start modding the brackets to extend and move the locking handles out so the handles don't get trapped under the seat. Look at the picture and think about how you need to mount the seat to ride on the rails. Obviously anything that's too wide to fit between the transmission hump and the door panel won't work. Use common sense here. I went ahead and measured between the door panel and the transmission hump. A seat that is wider than 21.5" at the base will not physically fit unless you start hacking up stuff. So keep that in mind while trying to fit some of the bigger seats. Let's say 36" max height. Anything higher than this won't physically fit between the cat hump and the headliner. Length let's say be reasonable. If it can't fit between the steering wheel and the rear seat then obviously it won't fit at all. I also have another solution for people who want maximum lowness. The Dent Sport Garage car gave me some inspiration. Stay tuned. Last edited by g6civcx; 10-19-2009 at 08:34 AM. |
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| | #2 |
| Post Whore! ![]() | For reference, I use a Kirkey Roadrace Intermediate 15". It measures 16.5" width, 35" height, and 24" long. It fits perfectly on these rails, with about 2-3" of clerance between the seat and the headliner. |
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| | #4 |
| Post Whore! ![]() | Thanks for the info. I updated the post with the info. We don't have Skylines here so the vendor couldn't tell me. Do you know if it fits all R32-R34, or only certain models? More tips: Use antiseize compound on the treads of the nut and bolts. Torque the bolts to 32-41 and the nut to 19-24 ft-lbs. Be very careful threading the bolts in since the weird angle can strip the threads easily. |
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| | #6 |
| Post Whore! ![]() | |
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| | #9 |
| Leaky Injector | I have a Kirkey Intermediate Roadrace seat as well that i want to try to fit to my car this winter so this post is a great help to know that i can use a set of rails and not have to completely engineer my own brackets. Thank you Can't wait for more info Last edited by Ruff Ryder 6; 12-02-2009 at 06:31 PM. Reason: wrong seat |
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| | #10 |
| Post Whore! ![]() | I got the idea from the Dent Sport Garage car. I drilled out all the spot welds that held the bar that elevated the seat up from the floor. Then the floor where the hump is was cut as much as possible without hitting the cat. Then the floor is rewelded in flat. ![]() I'm using a universal Summit bottom mount sliders shown mounted and next to the Bride for comparison. ![]() ![]() ![]() When mounted in the car, headroom becomes a whopping 43". The seat is actually too low. I have to order a pair of seat brackets to raise the seat off the floor and adjust the title a little bit. |
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| | #12 |
| Leaky Injector | So using one of the aftermarket rails with that seat was not an option? how close to the headliner would you be if you used some of those rails without removing the cat hump. looking for a quick option if there is one here. |
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| | #13 | ||||
| Post Whore! ![]() | Quote:
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What option would there be? You put the seat on the rail. You mount the rail in the car. If it doesn't fit, you bend or trim the aluminium seat. Done. | ||||
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| | #14 |
| Zilvia Junkie ![]() | this is awesome i also have a kirkey, but i tried useing the stock rails.... it hits the sun roof, and the car is stripped, no headliner. gotta get me some rails.
__________________ grip like roots, float like leaves. wtb s13 sus. |
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| | #15 | |
| Leaky Injector ![]() | Quote:
Thanks
__________________ (818) 628-0286 | |
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| | #16 |
| Post Whore! ![]() | Go to SummitRacing.com. Drill down to Interior & Accessories, Seats, and Seat Brackets. They care a bunch of universal bottom mount sliders. The one I have is the summit Racing brand part # SUM-G1153. |
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| | #17 |
| Leaky Injector | I ask because when i decide to put a cage in the car, my head will have to be lower than the forward bars when i am sitting down with a helmet on. That is why i was asking if one could "get by" by using some low max rails or something. |
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| | #19 |
| Premium Member ![]() | Just an fyi you can beat down that hump on the drivers side (custom exhaust, no cat of course) for people not wanting to cut/weld. |
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| | #20 |
| Zilvia Member ![]() | |
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| | #21 |
| Leaky Injector | |
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| | #23 |
| Leaky Injector | |
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| | #24 |
| Leaky Injector | Kirkey Racing 99204 - Kirkey Universal Seat Brackets - Overview - SummitRacing.comthey say to bolt to your roll bar but u can bolt them right to your seat rail the to the side of the seat |
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| | #26 |
| Leaky Injector | |
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| | #27 |
| everything was beautiful... ![]() | Does anyone know if these summit sliders will fit most aftermarket seats? If so, how do they mount with that hump taken out? I assume flat on the floor, with holes made through the floor? |
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| | #28 | ||
| Post Whore! ![]() | Quote:
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It's just nuts a bolts. Nothing special. | ||
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| Posted By | For | Type | Date | Hits |
| De cubo o tapizado al 240sx - www.NipponPower.com.mx | This thread | Refback | 12-10-2009 09:34 PM | 11 |