my F2T swap :D (56k warning) - Mazdatruckin.com Truck Forum and Tech Site

dealwithit · #1 (**permalink**) 11-24-2007, 10:07 PM

well people, as you probably guessed i backed out on my 13b-rew swap and am going with the simpler swap of an F2T out of a 90 mx6. i've got the motor and pretty much all the parts just need to do alittle fabbing and assembly and it should be good to go. i finally started on my megasquirt today and so far i've got my jimstim 1.3 built and ill put the MS2 together maybe next week. so heres some pics as i go.

the motor

my jimstim

starting on the MS2 board

dealwithit · #2 (**permalink**) 11-25-2007, 11:53 PM

yah, it should go pretty good, i kinda wanna stick with the stock turbo and injectors for now, then maybe try bigger down the road. the big things i gotta do the engine first are, flip the intake plenum around 180degrees, make an adapter to move the turbo forward, mount the edis ring on the crank pulley for the MS2, lighten the flywheel, cover up the hole for the distributor, shorten the cam shaft(so it doesn't stick out the back so far), and i think thats about it.(just engine wise tho)

EmJay · #3 (**permalink**) 11-26-2007, 06:28 AM

dude, save yourself a step. the upper intake plenum that you have and the one that I have use the same gasket. Find yourself a, 86-87 626 and take the upper plenum.

fredio54 · #4 (**permalink**) 11-26-2007, 11:55 AM

you realise that the ring gear diameter is larger on the f2t?

you either need to do a hard out conversion like i did, or relocate the bolt holes for the starter, or use the stock truck flywheel and clutch with a HD pressure plate and new disk. the latter will hold if you buy wisely. i only went to the extra trouble because of the big power...

heres the link on the conversion if you decide to go that way :

http://www.mx6.com/forums/1g-mx6-gen...-n-tranny.html

fred.

dealwithit · #5 (**permalink**) 11-26-2007, 10:45 PM

hmmmmm i wonder if maybe i can swap the turbo pressure plate onto the truck flywheel? anyone know if that works? and as for the plenum, are you sure the 86-87 626 top will fit? like onto the 12v bottom half? sounds like an idea if i can find one.

fredio54 · #6 (**permalink**) 11-26-2007, 11:56 PM

no, the two clutches and flywheels are totaly different designs. even if you kept the big flywheel with mods, you would need to find a friction disk with the correct spline for the small trans, that may need to be custom.the by far easiest option is a heavy pressure plate and the b2000 flywheel and setup. bare in mind, all the fe3t guys with mx5s use that same setup, and so do all the turbo bp mx5 setups. its not that bad, i'm just crazy fussy :-)

dealwithit · #7 (**permalink**) 11-27-2007, 04:08 AM

yah, i guess ill just go with the one i have in the truck right now, just lighten the flywheel up a bunch. its all pretty much brand new stuff, so we'll see. maybe i can fit the truck disk into the turbo flywheel/pressure plate?

EmJay · #8 (**permalink**) 11-27-2007, 07:14 AM

yeah, I am sure that they use the same gasket and will bolt on alright.

fredio54 · #9 (**permalink**) 11-27-2007, 12:55 PM

Quote:

Originally Posted by dealwithit

yah, i guess ill just go with the one i have in the truck right now, just lighten the flywheel up a bunch. its all pretty much brand new stuff, so we'll see. maybe i can fit the truck disk into the turbo flywheel/pressure plate?

it might (probably will) fit in there ok, but you defeat the purpose by having less clutch disk friction area. that would be the worst of both worlds. if your stuff is all new, try it, its not exactly hard to pull the trans and chuck a new disk and hd pressure plate at it if it slips on boost.

careful lightening, take material from the outer edges mostly (most inertia), leave enough meat on the back of the friction area to absorb heat under heavy use, and leave enough meat in the middle to avoid it coming through the floor and taking off your leg. machining to cast iron flywheels should be kept to a minimum really. the right way to go if you want light is to get a fidanza or similar. thats why i took a bare minimum off the back of mine, not so much to lighten it, but rather to smooth the casting out and try to eliminate any stress risers. besides, the benefit of lightening a flywheel is so small in reality. its barely worth it at all (not saying i wouldnt, but...)

fred.

dealwithit · #10 (**permalink**) 11-27-2007, 08:48 PM

yah true enough. that just makes everything that much easier then. i'm only gonna be running the stock turbo and injectors for now so its not like ill be putting down more than 180hp and like 220flbs through it. plus yah its a 2 hour job to drop the tranny in these things anyways if it does cause a problem. i was just gonna it lightened at the local engine shop, not by myself.

fredio54 · #11 (**permalink**) 11-28-2007, 01:37 PM

hp matters to surface area and heat capacity, torque (which is what you need to hold) matters to the holding capacity and pressure plate.

as for the shop, just keep an eye on them. not all shops are totally good. probably the same one you mentioned once before which you seem happy with, but your legs are important man :-)

cant wait to see it going.

a dude on mx6.com just posted that he ran a 14.3 with upped boost on an f2t swap with no traction for half the track! that gives my hopes of low 13's some chance of being realised. which makes me very happy. lets hope you do as well or better as he did! :-)

fred.

Kyrasis6 · #12 (**permalink**) 11-29-2007, 04:26 PM

There is plenty of metal on the flywheel that is only there to make it heavier. You could probably cut 10 lbs off of it without even getting close to affecting it structurally.

dealwithit · #13 (**permalink**) 11-29-2007, 11:47 PM

yah, and its not like i'm pushing 600hp through it. i'll be lucky if i break 200. well i scored 2 N/A rx7 trannies today for 40 bucks so now i can start swapping over my bell housing and such. finally good gears! with a crazy overdrive too hopefully

these are the gears in the rx7 tranny (heavier and beefer looking)

These are the gears in the B2200 tranny. i wonder if that means the other ones are stronger?

fredio54 · #14 (**permalink**) 12-01-2007, 10:49 AM

yes, course teeth = stronger.

good photos, i'm steeling them :-) if you dont mind of course.

keep a close eye on the input shaft length, rota ones are shorter usually, make sure it spigots in your pilot bearing, and the spline at least goes most of the way into the friction disk. just compare with wear marks on the old one to find out.

as for the flywheels...

i personally wouldnt want to remove any material from behind the friciton surface except to A make it an even thickness, B make it smooth to take away stress risers, i wouldnt want to take any at all from teh centre except maybe to make it smooth, and that only leaves you with the edge where maybe 2 - 4 pounds can be taken without going silly. you can of course take more from the friction surface back, but you reduce its heat capacity in doing so, and thats a bad thing. its a torque monster motor anyway, not a revvy beast, its not that important. my fly ended up weighing 9,2kg, and even with the lag, look how it revs in 1st wheelspinning, non issue really.

fred.

dealwithit · #15 (**permalink**) 12-01-2007, 09:44 PM

yah, thats what i figured. i just gotta pull the housing off and count the teeth to see what i've got. i went and bought these thinking "yah, NA rx7 second gen tranny with the .691 overdrive, awesome!" then i realized that i think these are from a first gen so that pretty much turfs my ratios i wanted. but ill find out once i get em split open. yah man go right and nab em. what ya need em for? or just for records?