Drivetrain FRD-RWD conversion

Discussion in 'Drivetrains' started by tclayton185, Mar 15, 2017.

  1. tclayton185

    tclayton185 FEOA Member

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    I have a 91 GT and have always wanted to convert it to RWD. any suggestions on how to undertake this. I really like the 1.8L thats is the car now and would like to keep it in the car. I would also like to do a forced induction system to it.
  2. Ocramzeej

    Ocramzeej FEOA Donator

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    Anything is possible with enough money. The main struggle you're going to face is you'll have to create a transmission tunnel all the way back to the rear wheels. So, you're going to have to do a lot of custom fab work to make it happen, and probably re-do the steering as well.
  3. Ocramzeej

    Ocramzeej FEOA Donator

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  4. novanutcase

    novanutcase FEOA Member

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    The tunnel is the least of it. He'll have to have a custom drive shaft made for the car. He'll have to find a rear end with the same track width as the car along with having to cut out part of the trunk floor to get the differential to fit. He'll also have to weld in new attach points for all the rear suspension along with having to re-engineer the front suspension.

    It might be easier to find an aftermarket front clip that he can weld onto the unibody and run some subframe connectors to the rear suspension to tie it all together. He'll also have to weld in new motor mounts since he'll have to reorient the BP motor 90* so that the trans points towards the rear along with re-engineering the mounts for the trans. Also, he'll have to probably have a custom bell housing made for whatever trans he decides to use that will bolt to the BP motor.

    Lots of fabrication. If you're going to do this yourself you're going to want to buy a sheet metal brake and shear to cut the pieces you're going to need for the fabrication. A welder will also be needed. English wheel if you're going to be doing any complex shapes.

    John
  5. 99SseSPORT

    99SseSPORT FEOA Member

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    IEDL can make you a custom driveshaft for 300$. I've had 3 done from them.

    It's honestly going to require you to design and engineer a roll cage chassis tied into a rear subframe, and a rear 4 link suspension to accommodate a rear differential (I would use an e30 BMW rear end and half shafts or a Vw bus 091).
  6. 99SseSPORT

    99SseSPORT FEOA Member

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  7. tclayton185

    tclayton185 FEOA Member

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    Thanks everyone for the feed back on this topic. So here is a little more indepth idea of what Im thinking and what I have to work with. I have a full machine shop to use and an auto cad system at my disposal. The only thing I dont have is a CNC machine to use. I have been toying with the idea of a tube chassis. I have been trying to find a set of blue prints for one. The fabrication portion of the build is really not that big of a deal for me. I know its going to be very labor intensive and not easy, but im put for that challange.

    My thoughts for parts are MX5 trans. which should bolt up with little modification. The rear end has been my biggest problem to figure out. Trying to figure out the angles for the drive line and relocation of the gas tank. Which I'm 99% sure I will have to put in a fule cell in the trunk. I want to do a set of coil overs at some point . I will do a forced induction system at some point as well just not right away. While I have the motor out its going to get a full rebuild with up graded internals. I know it already has forged internals but I hope I can make them a little better and maybe new cams. I am also looking to upgrade the ECU as well maybe Haltech or Cosworth, not 100% sure who im going to use at this point. I just want everything to be ready for a forced indution system and tune-ability.
  8. pextor

    pextor Moderator Staff Member

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    Just buy a miata.
    Pizzaman5000 likes this.
  9. tclayton185

    tclayton185 FEOA Member

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  10. Vhturbo11

    Vhturbo11 FEOA Donator

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    I would say ideas towards the Miata concept for influence wuld be a good start.

    Sent from my SM-N900P using Tapatalk
  11. pextor

    pextor Moderator Staff Member

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    All the effort you are putting into trying to make a "custom" escort could be put into making the car you essentially want.... BETTER.

    You want a rear wheel drive car, properly sorted out - miata. The cobbled together mess of an escort you are trying to make will either never get finished or be a disaster if it does get finished. And it will be a lot more effort (and possibly more expensive) than just buying a miata.
  12. tclayton185

    tclayton185 FEOA Member

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    The fact of having a rear wheel drive car isn't the reason why I want to do this build. I have two rear wheel drive vehicals now a 93 Supra and an 80 short bed chevy whith a 396 in it. Im not lacking on power or rear wheel fun. I want to do this build because it something I have never done and always wanted to do. Its about expanding my knowledge and skills when it comes to fabiction and engineering. I have always wanted to do a convertion like this for 10+ years. I have had my EGT for 5 or 6 years. I didn't just go out and buy it just for this project. I know this isnt goin to easy and its going to hard and its going to have a lot challenge. That is really the whole point of doing it. I have a lot of the materials I need for the fabrition part of the build.

    Miatas are great cars dont get me wrong. I know I can go out and buy a miata right now for not much money, and, with a hand full of upgrades have a 200+hp track day and or daily driver dream. There are 100's or 1,000's of them. I know I could do an engine swap on one and put whatever my heart desires in it. Be it an LS, 2JZ, or any RB motor the sky is truly the limit. But I don't care about that. I have done engine swaps, I have done forced induction, I have help build circle track and drag strip cars. I have not done a FWD - RWD convertion.
  13. pextor

    pextor Moderator Staff Member

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    go for it then.
  14. dchawk81

    dchawk81 FEOA Member

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    Still gonna be an Escort though.
  15. novanutcase

    novanutcase FEOA Member

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    Screw all that. RX7 with an LS swap would be the way to go!! LOL! Kidding!

    If your aim is to improve your fab skills then go for it. Just keep in mind that it's not only fab that your going to have to improve on but also engineering as you mentioned because that is essentially what the bulk of the work will be. Any knucklehead can weld crap together(I'm a great example of that! LOL!) but to be able to optimize all the systems into one cohesive package is the real talent.

    I look forward to your build and am willing to offer whatever engineering ideas I can that may help you get to where you want to go.

    John
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  16. dchawk81

    dchawk81 FEOA Member

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    Nah he likes the Escort for its motor so an RX7 with a 1.8L swap would be the way to go.

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