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Mazdaspeed Archive => FAQ and How To(In Progress) => Topic started by: JCALD on December 19, 2015, 02:55:42 PM



Title: LOWERING STOCK SEAT
Post by: JCALD on December 19, 2015, 02:55:42 PM
I just completed a project to lower my stock seat without cutting out foam.  This was accomplished by deleting the seat slides and replacing them with fabricated units.  I netted 1" additional head room from the project.

I am 6'-2" so the seat is located as far back as possible without interfering with the original floor mount locations.  The seat bottom was angled up approximately 2" in the front to provide leg support.

The seat mounts are made from mild steel in various sizes.

Main runner - 1/4"x1-1/2" bar approximately 39 cm long.  Anchor holes are aligned with original connection points.
Front Anchor - 1/4"x1" bar approximately 7.5 cm long.
Riser - 1"x1"x1/8" steel tube approximately approximately 4 cm long with a 14 degree angle cut.
Seat belt anchor - 1/8" mild steel plate cut to match existing slide rail unit using original attachment points.

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4350.jpg)

Overall view of seat mount brackets mounted to seat.

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4352.jpg)

Right side bracket mounted to seat.  Note attachment points of bracket to original seat belt location.  This requires a spacer to be welded to the bracket.

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4353.jpg)

Left side bracket mounted to seat.

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4354.jpg)

Main rail at rear of seat.  Note slot for rear floor anchor bolt necessary since there is no room to drop floor mounting bolt in from the top.

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4358.jpg)

Note slight bend in main rail at rear to align with floor mounting point.

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4360.jpg)

Front mount detail.  Note slight bend in bracket to align with floor mount.

The rear floor mounting bolts are left in place with enough room to slide the seat rails in.  Once in place and the front brackets bolted down the rear bolts are tightened.  This operation is totally blind and requires a short/thin 14mm wrench.

HAVE FUN!!!


Title: Re: LOWERING STOCK SEAT
Post by: joeereid on December 19, 2015, 08:07:18 PM
Nice piece of work! Been so long since I did my Sparcos that I'd forgotten how much "fun" sorting them out was.


Title: Re: LOWERING STOCK SEAT
Post by: millsj on December 19, 2015, 11:14:20 PM
If you have visions of fabbing a bracket for the passenger side, you should know that the two sides have different dimensions.  I think the passenger side is narrower. Don't just build one like you did and think it will fit.

Excellent fab work!   :mrgreen:


Title: Re: LOWERING STOCK SEAT
Post by: JCALD on December 19, 2015, 11:58:01 PM
I always disassemble and verify dimensions before fabricating anything and I have no plans for the passenger side.


Title: Re: LOWERING STOCK SEAT
Post by: barmato on December 19, 2015, 11:59:29 PM
Nice work.  I wish someone made brackets like this.  I don't have the equipment to fabricate them but I'd love to buy a set  :'(


Title: Re: LOWERING STOCK SEAT
Post by: svetki on December 23, 2015, 04:15:35 PM
Nice work.  I wish someone made brackets like this.  I don't have the equipment to fabricate them but I'd love to buy a set  :'(
  Same here!


Title: Re: LOWERING STOCK SEAT
Post by: Bassparrott on December 23, 2015, 05:55:34 PM
Here as well!


Title: Re: LOWERING STOCK SEAT
Post by: eviltwinz on December 23, 2015, 08:34:18 PM
Fab work looks great! Nice job!


Title: Re: LOWERING STOCK SEAT
Post by: water hazard on December 25, 2015, 01:27:45 PM
Did you reuse the original triangular plate to mount the seat belt buckle or is that a new piece as well? 


Title: Re: LOWERING STOCK SEAT
Post by: JCALD on December 25, 2015, 03:57:24 PM
That is a new piece.  The original piece is welded on to the slide.  The new piece has a nut welded to the back to receive the standard seat belt attachment bolt.


Title: Re: LOWERING STOCK SEAT
Post by: ryanj on January 05, 2016, 09:21:50 PM
Very nice work.  If you ever decide to build/sell a few, give me a shout.  I'd buy immediately. 


Title: Re: LOWERING STOCK SEAT
Post by: JCALD on January 06, 2016, 01:09:36 AM
Not ready to start a fab shop yet, but what would you guys consider a fair price for it?  If I feel like I can come out a little ahead on them I might consider.


Title: Re: LOWERING STOCK SEAT
Post by: ryanj on January 06, 2016, 01:37:24 AM
Honestly, I wouldn't even know what something like this would cost. 

How much did it cost you in parts and material?


Title: Re: LOWERING STOCK SEAT
Post by: water hazard on January 06, 2016, 11:52:35 AM
I would pay $250 right now


Title: Re: LOWERING STOCK SEAT
Post by: ryanj on January 06, 2016, 04:09:59 PM
I'd put up $100-150 for one set of rails.  I'd pay right now as well.


Title: Re: LOWERING STOCK SEAT
Post by: svetki on January 06, 2016, 08:28:09 PM
I'd pay 150ish for drivers side low as it can go and farthest back.


Title: Re: LOWERING STOCK SEAT
Post by: JCALD on January 08, 2016, 02:35:34 AM
Working on possibly fabricating a few.  Give me a few days and I will let you know.


Title: Re: LOWERING STOCK SEAT
Post by: ryanj on January 09, 2016, 03:11:19 AM
Quick question -- do you have a rollbar?  I'm curious how the positioning of the seat may/may not be compatible with a roll bar.  I know I can't put my seat as far back as I would like with my Hard Dog Hard Core bar.


Title: Re: LOWERING STOCK SEAT
Post by: JCALD on January 09, 2016, 02:28:02 PM
I have a Hard Dog Sport with two diagonals with the foam pad and leather cover.  The seat back clears the top bar by 1-1/4" when tilted back.  I need to remove my speaker bar since the seat is resting against it.


Title: Re: LOWERING STOCK SEAT
Post by: ryanj on January 10, 2016, 04:50:43 PM
If you decide to fab some of these, mind shooting a few pictures of the seat fitment with the bar? 

My biggest issue is that in order for me to sit in my Miata comfortably, my seat basically RESTS on one of the diagonals. :(


Title: Re: LOWERING STOCK SEAT
Post by: JCALD on January 10, 2016, 09:48:01 PM
We have a local machine shop that does water jet cutting so I am working on a proposal from them for the parts.  If that comes in within reason I will probably fab a few.  Here are come pics of the installed seat.

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4447.jpg)

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4448.jpg)

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4449.jpg)

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/IMG_4450.jpg)


Title: Re: LOWERING STOCK SEAT
Post by: ryanj on January 10, 2016, 09:52:53 PM
Impressive. That is low!  Let us know!


Sent from my iPhone using Tapatalk


Title: Re: LOWERING STOCK SEAT
Post by: retooferab on January 11, 2016, 02:52:18 AM
If anyone wants to do a "shorter guy" version of this someday, let me know.  I would love to lower the seat, but I'm 5' 10" and not all the way back ...and not at all capable of fabbing anything up.


Title: Re: LOWERING STOCK SEAT
Post by: svetki on January 11, 2016, 03:21:36 AM
JCALD, you have a picture both seats so we can see the difference between the two?


Title: Re: LOWERING STOCK SEAT
Post by: JCALD on January 16, 2016, 10:24:13 PM
Here you go.  I positioned the passenger seat the same distance from the rear body wall as the drivers seat (since it is no longer adjustable) and then reclined the seats so they were in line with the roll bar.  The passenger seat just touches the roll bar cover and the driver's seat is approximately 1-1/4" below it.

(http://www.mazda-speed.com/albums/04-MSM-IN-GRANBURY/GOPR1912.jpg)


Title: Re: LOWERING STOCK SEAT
Post by: JCALD on February 07, 2016, 10:24:10 PM
I will be offering some of these seat rails for sale.  For safety concerns the design has been updated to move the seatbelt attachment to the transmission tunnel instead of the seat rail.  The items for sale will be posted on the "For Sale or Trade" forum within the next 5-10 days.