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Seat Rail Modification

cogs

By cogs,
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cogs Experienced

cogs

Posted
Posted

I want to get the seat rails moved back (bolted further back in the car) or leave them where they are, but extend the rails (weld extra lengths on) so the seat has more travel.

Does anyone know which option would be easier or more feasible? Who can perform this work? I imagine I will need to get it engineered?

This will be for the drivers seat. I've noticed in the R33 the front part of the rails is bolted to a raised section of floor, thus if you moved it back you would have to straighten this piece out. Are there any other things which come to mind?

Has anyone else done this to an R33?

Thanks in advance.

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Duncan Grand Master

Duncan

Posted
Posted

Nope I haven't ever tried this, but I can't see how you would extend the rails, it would have to be moving the rails backwards. Basically you need a good workshop to help you out I'm sure they can extend the mounts to give you an extra bit of room.

Abo Bob Grand Master

Abo Bob

Posted
Posted

Maybe new rails could be fabricated that are longer. I don't know that you could do that at home though.

I'm also 6'5" (nearly 6'6") and I have no real problems with my R34. I need to lay the seat back a bit when wearing a helmet though.

Maybe you could get a race style seat (I think Ducan can get them :)) as this would sit you lower giving you more headroom.

Do those seats need new rails?

cogs Experienced

cogs

Posted
  • Author
Posted

Headroom isn't really a problem for me, it's more legroom as most of my height is in my legs.

If my left foot is on the clutch fully depressed then my knee fits comfortably under the steering wheel, otherwise, with my foot just resting on the clutch, my knee does not fit under the wheel and has to sit to the side of the wheel. Obviously, the same applies to the right hand side.

Although a spacer or dished steering wheel could possibly free up some room for my knees, my arms are already close enough to the wheel, so I'd like to actually make the seat further away.

What are the mounts that the seat is bolted to? Are they special reinforced areas of the chassis such that you couldn't simply drill new holes to mount the seat further back?

Thanks for your help guys.

kenetic Apprentice

kenetic

Posted
Posted

You can't just move the mounting points further backwards, you need to fabricate a mounting plate the rails will go to the plate and the plate will bolt to the seat, you can get a couple of inches here easilly without too much trouble but I wouldn't go past 15cm. You will need this engineered as well.

Duncan Grand Master

Duncan

Posted
Posted

Yes the mounting points are specially reinforced and new mounting points would need to be as well. But its not that easy because the floow is nothing like flat so the rails need to take that into account.

  • 3 weeks later...
  • 5 years later...
tridentt150v Grand Master

tridentt150v

Posted
Posted

I'd be careful and ensure that you get any seat mod engineered, I can see popo having a field day on this if you just do a back yard job. Esp. if you also do the passenger seat and are then involved in an accident - or sell the car and it is involved in an accident.

  • 1 year later...
Carbon 34 Grand Master

Carbon 34

Posted
Posted

Mine have been moved back on bride rails but on r34 sunroof still no headroom at 6'2" but large build not skinny butt

I'm back about as far as legal you cant be passed a certain point on the B pillar or seatbelts wont work now i need monkey arms cause I have to lay the seats back still ( new seats as well)

Wilshire motor trimmers does seat mods and engineers them in adelaide but wanted to do serious mods to the floor pan mounts etc , 1400 to do 1 drivers seat , just regular mount passenger side and the customer service was lame so didnt use them , still not happy with seating location , going to look at dropping the seat inside the bride rails to gain 40mm or so

Sunroof cars loose 30mm headroom per sales manual , Damn jdm cars with no leg room lol

Funny thing is when I was in japan I saw some tall asians , like 6'5" only thin as a rail , wonder if they cuss the local cars too ?

scotty nm35 Grand Master

scotty nm35

Posted
Posted

I am 6 foot and there is around 10 inches clearance from the roof lining to my head, plenty of room, even to slide a helmet on in the car.

Sounds like you need to sell the 34 and upgrade to a V35 or M35 Stagea. :)

Shoota_77 Veteran

Shoota_77

Posted
Posted

I'm 6'8" and actually don't find my 33 GTR too bad (relative to my Datsun 1200 Ute anyway!).

In Melbourne there is a business in Coburg (Franks Engineering) that perform seat modifications and engineers them.

I seem to remember them being pretty good price-wise.

Carbon 34 Grand Master

Carbon 34

Posted
Posted

I am 6 foot and there is around 10 inches clearance from the roof lining to my head, plenty of room, even to slide a helmet on in the car.

Sounds like you need to sell the 34 and upgrade to a V35 or M35 Stagea. :)

Hmmmm NO

R35 2013 black edition modded to hell YES

My old dodge 4x4 v10 extended cab fit ok haha piece of crap

To fix the problem - ADR rules in bin and do it even better like a rollcage with backing plates thru the floor and add crossbracing for side impacts lol

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