Some members of this forum have asked me to share my mx5 project so I will. In this thread will be some pics of what’s going on and some commentary to it. When the project is completed I will give a stronger documentation for toughs wishing to do so, including measurements I used.



My uncle dropped my camera in the toilet, now I have to buy a new one but I will dazzle you with some of my chasse work for now. Enjoy and much more coming soon.

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I will have someone’s camera I can use in a few days and I will get you some driveline shots and maybe drop the motor in position to show the line up.



The exhaust DP will catch the sub frame so either a custom DP will have to be made or notch in the sub frame walls some. The drive shaft comes out to only be around 1.5ft long. This should be good for some extra tq for the motor.



We have decided to tub the rear end of this car to hold the HP goals to the ground and remove the internal gas tank to a fuel cell. The car will not be emissions legal but street driven https://www.nopistons.com/forums/pub...DIR#>/wink.png



We are moving forward next week I believe in mounting the motor in its chosen position. The 13b does give the option of setting the motor back farther for bettor weight distribution. This includes knocking the fire wall back some. I am opting out of this I think. I will take final measurements next week for the GT42R and see if there will still be enough room up front.

Pics remind me of my project in the beginning, stripped car and all..



It will be interesting to see how this project comes along, i hope you will keep us posted!

Wow, looks like a lot of work. Best of luck with your project.

The pic looks like an n/a block, so are you tuning an n/a with a turbo? Or did I miss something? Keep with the updates, sounds like it'll be an awesome car.

That is correct it is a 6prt S4 NA block runing a GT42R

I sure hope you have a good EMS tuner.....cause those irons will crack under boost...........

did you actually do work to the chassis besides strip everything out of it? cant tell from those pics

R.P.M. - Steve Kan. Nahh, that's like saying any 13b Iron will crack under boost the only part that sees sufficient boost stress is the port edges and im going P-port but the housings and rotors will see allot of boost stress but they will be fine its been done hundreds of times. I don't consider 17 to 22psi much stress just requires good tuning for pump gas.



Rob x-7 - Not really and those pics do not show any of it I am waiting on a family member to come back into town to barrow there camera so I can show you guys. What was done is the markings and mounts for sub frame braces, Tranny braces and the mounts for the rear diff. I am trying to avoid any more modifications I believe it can be made unneeded to modify the firewall and shifter hole and I am trying to do this and allow fitment for that turbo

Use your MX5 5 speed transmisson, I wouldn't waste time fabbing new RX7 transmission mounts





The input shaft is 15/16" x 22 spline, so is the N/A RX7, just swap the bellhousing and bolt the block up, then fab mounts

Read



http://members.aol.com/solomiata/Drivetrain.html

Yea solo miata is a nice site.



My HP numbers will rip the NA trany to pices. I also already have the RX7 rear end up in there and the pinion is longer so a custom shaft is needed. With the RX7 rear end the mount braces are not the same nor is the trany so the mx5 brace needs moded to fit. Without my HP goals I think you advise is great and would save allot of time to anyone not going to be pushing high numbers

Torque wrecks gearboxes, not horsepower.



Mark

Yes I am aware of this thank you. But in aspect a 600+ WHP car will be pushing in the 540+tq range do you honestly think it would hold together?

I'm aware of 1000bhp cars making just over 200lb/ft so anything's possible.



Mark

So is the other end of the spectrum





400 hp and 1500 ft/lbs tq





guess where those numbers come from!

A big ****-off diesel? Any idea where mine came from?



Mark

Send me an e-mail and I will send you some pix of my swap(99 with a 13bt and rx-7 drive train). You might get some ideas.



Steve

driftor@cfl.rr.com

I would love to see how this project is going for interest reasons. I myself owns a '92 Miata and plan to be swapping a 13B-RE with a bridgeport and GT35R into it.

uhh i wasnt making any personal remarks at anyone, just supporting your previous statement





and yes a 15l turbo diesel engine

should be an interesting project when it's finished.........







what the hell was your uncle doing using the camera over the toilet?... or do i really not wanna know?

I wasn't implying you were - sorry if it sounded like that https://www.nopistons.com/forums/pub...IR#>/smile.png



Mark

GreyGT-C - We were at the race track and he was taking pics of my race's. He went back to motor home to go to bathroom and had it in his hands or something and he said it sliped out into the toilet.



Ok no more disel talk I know my dad has a 750ftlb TQ cummins turbo disel. However tq is a by product of HP, they share hand and hand based on design of motor.



thagr81 us - Yea man keep and eye on it as seen there is another 13b mx5 person in this thread so it should get good. Just memeber this is not a honda swap and big numbers on a mx5 will require alot of fabing so best of luck.

Torque is force x distance



Horsepower is force x distance x time





Torque doesn't require the shaft to be spinning, horsepower does for work to be accomplished within time









Torque is no biproduct

Yea. There's quite a few of them over at Miata.net who have done it. I already have a pretty good layed out plan for the swap and supporting stuff to make it all go as smooth as possible. Plus fabbing isn't a big deal since my old roommate works for his dad who owns a fabrication shop. So I'm pretty much set when it comes to that stuff. https://www.nopistons.com/forums/pub...#>/biggrin.png

Iceblue do you still want some measurements I just read your post on the other thread. Or did the pictures do the trick.



Steve

HP = The amount of work done over a period of time.

TQ = The instantaneous amount of force delivered in FT lbs.



TQ and HP are a byproduct of a design. No matter what you do to the motor the 2 forces will follow a specific curve.





13bturbomx5 - I have not looked at the pics yet but I would love some measurements to base against.

13bturbomx5 - Pics where wonderfull alot of them were along the lines I have been working and some gave me some ideas thank you. I would love some measurements to base against.

right





torque is NOT a biproduct of horsepower as you previously stated

Horsepower is an imaginary number. There is no way to measure it, you derive it from 2 variables that you can measure, torque and time. That would make horsepower a byproduct of torque.

^Bingo... even dynos calculate your HP based on the instantaneous torque and the RPM at which it was achieved (with a conversion factor). 1000 HP 200 TQ engines can get these numbers by spinning at nuts RPM, and vice versa for the 15L diesels

mazdaspeed7 - Thank you I had it backwords :-/ it happens.

torque and horsepower are indeed related no matter how it is looked at..the only variable is the outcome product..

ie more HP vs Torque or more Torque vs HP

I would love some pics of this project or anyone elses as I too am doin this swap in a 91 in my garage...and even though I am almost done I wouldlike to see if i went wrong anywhere