No_Rotor_RX7

a quick catch up for those that don't know me...

i have been building rx7's for a good long time now... started with the FB's went thru a few turbo 12a setups, then the V8 swap (yes i was all but banned on here)... then i parked it and built an TII FC. here is where i stand right now..

i do miss the FB, i still have the one with the 350sbc in it but was thinking of pulling it out and putting my TII motor in it. then slapping a stock motor back in the FC.

here's some pics to help:

400+rwhp bridgeport 13B, 9.4:1 comp rotors, Blow-thru, 70mm turbo,etc...



yea, the headlights are broke



Here is the FB, semi-torn down...








should i bother? think the weight will make THAT big of a difference? i know the fc has mid 11's in it on the pump gas tune it's at right now. i was hoping maybe that could throw me to a high 10 in the FB


Should i do it?????

trochoid

iTrader: (6)

Hell yes, why haven't you done it yet? First time I've seen a blow-thru on a 2nd gen. What are the specs on your turbo, details details, lol.

Kim

And what's up with the rearlights on your FB, I kindda like that red thing.
Never seen that before

No_Rotor_RX7

i haven't done it yet simply because... well i don't know really. i got the FC with no intention of making it this beast, but when you build these engines on the daily well you can get carried away a little easier hahaha. now that it runs and omfg it runs stroooong, i was thinking it would be even more scary in the 1st gen. BUT i have a 12a i could build up as well or an REW... but this should be more than enough to run deep 10's in that FB.

It's a MP T70 = 69.5mm inducer/ 93mm exducer Q-trim 1.0 hotside 3.5 outlet. CSU built 750cfm double pumper, CSU carb hat, Racing Beat intake manifold, 12a Distributor *not locked*, HKS log exhaust manifold, 1/2" spacer between mani and turbo just to give more room, 3.5" downpipe to corksport 80mm cat-back, RICE racing Pre-turbo water injection, Leading ignition ONLY fired off stock coil w/ MSD 6a... ummm MR pulleys, ACT lite flywheel/ HD clutch kit... maybe other stuff? haha

Engine: S4 TII irons, my own large streetport w/ bdc eyebrows, opened up the exhaust ports a little early and closed them slightly later with a good widening, 9.4:1 rotors, RA super seals w/ stock mazda springs, FD opr's, RX8 stationary gears, blah blah blah

No_Rotor_RX7

yea i have done this on all my FB's tail lights... it's translucent red paint. i love it!

trochoid

iTrader: (6)

How do you like the MP T70? I'm still looking around for a turbo for my TII swap and I am a newb when it comes to them. Your build is quite similar to my plans, S4 TII, possible, hell, probable, 1/2 bp and a hp goal near 400. Next question would be what rpm does boost start to come on, where does it hit full boost, and what psi are you running?

Breaking 12.5 would satisfy my goals, for now, lol. 11's would be sweet. Then I might have to get serious with the REPU someday.

1st gen looks very clean, btw., perfect look for a sleeper.

No_Rotor_RX7

you just want to run 12's???? then i would just do a streetport and a 60-1.

i can't be a good comparison because i honestly think the carb setup is helping my spool. i get 10psi @ 1/4 throttle in any gear except 1st. i almost cruise in boost... i am only running 14.5 psi right now and i hit that between 4k - 4500 rpms in 3rd. this turbo with the s4 n/a rotors is unbelievably streetable. i get up to speed very fast barely getting on the throttle in this heavy FC passing traffic on the highway is a matter of staying in 5th gear and just easing on the throttle. no lean spots with the carb and i cruise at 14:1 afr's

yea with the v8 in the fb it was so quiet nobody had a clue what hit them! i can't lie, it was stupid fun but i just missed the top end power band. the GT42R never got it's full chance on the v8 as i knew that was just way too much for the car.

the main thing holding me back from putting the bridge 13b in the fb is i really don't think i want to use the front cover mount method. i'm afraid there will be too little support in the rear of the engine and that may cause issues.... i don't have much time to fab stuff up this summer. gotta go back to engineering classes in the fall

oh and i painted the fb myself... you can find some progress pics in that "budget paint job" thread haha

85rx-7gsl-se

iTrader: (2)

Definently go with the TII. I just swapped an S4 TII, stock boost in my 85 GSL-SE and it is amazing. So with your 400hp motor, you will be smiling all day long.

No_Rotor_RX7

yea i'm still debating it all in my head... the thing i do love about the FC the motor is in is that it plants the power soooo well! i may just have to build a bridgeport 12a turbo for the FB

HadaGSL-SE

iTrader: (6)

Zac,

First off your FB is beautiful seeing it in person I was very impressed with V8 even before the turbo. I saw it last summer at an RX-7 meeting down there. I was with your buddy running the 12a turbo.

Once I move back down to Charlotte I am going to have you build my turbo motor.

I would stick the FC motor in the FB. They are just more fun. Throw a stockish motor in FC and daily drive it.

-Greg

No_Rotor_RX7

thank you much! i put a lot of work in to that car, it's nice to hear some appreciation

i'm just looking at how difficult the transmission mount and driveshaft will be. everything else should be cake... except for some re-enforcement where the stock motor mounts are on the block.

Fire85GSLSE

iTrader: (29)

I would leave the fc alone since it is done and working well. But I would remove the 350 from the FB and build a turbo 12a or a turbo 13b to put in it.
Then you would have two sweet *** car that are rotary power and move.

I am planning out an S5 13bT in my 79sa or my 85 gslse. Still have not decided on what car as the gsl-se is about done and well the SA needs everything.
I just lack the front cover being built to hold the S5 OMP, turbo drain, then the drive shaft, and just to figure out how to trigger the S% ECU from the SA or from the GSL-SE. Seeing this stuff makes me want to get on it and get it done.

No_Rotor_RX7

i hear ya man, you pretty much have said what all my local buddies here keep saying. the ones that have ridden in the car don't understand why i would want to go any faster hahahaha. i haven't even touched the efficiency range of this turbo yet i dunno, i have two 12a's sitting in the garage ready for a build. might have to build a new turbo kit and see what i can get out of the ol' motor

i'll make my mind up by the weekend, 'cause i could just as easily throw together a stock port build and use the stock injection setup for the TII to be a daily. Two fast cars would be fun tho AHHHHHHHHHH! hahahaha decisions!

Directfreak

iTrader: (2)

the hell with what everybody is saying... turbocharge that V8!!!!!

nick812

Looks like the SBC is already turbo in the pic.

twinkletoes

iTrader: (17)

Ya, it does look turbo. I would definitley drop that t11 engine in the FB for sure.

1badFB

iTrader: (1)

I agree that the red tail-lights look awesome, thats got me thinking...


Dont get me wrong, I like seeing V-8s being removed... but Its got me so curious, whats pushing you to remove a turbo V-8 from your first gen?

twinkletoes

iTrader: (17)

He said hes getting 11s with the t11 he has in the second gen. Put that in the first gen and your close too, if not hitting 10s.

FirebirdSlayer666

iTrader: (3)

I don't mean to go off topic but this has the gears in my head turning as well. Is there an orange/amber transluscent paint as well? Anyway both cars look great. You might have to purchase another FB to satisfy your needs LOL. I say drop the Turbo II in the FB and build the REW for the FC, or keep the FC the way it is and put the REW in the FB LOL. I know you'll enjoy whatever decision you make. Good luck!

bad 83

iTrader: (3)

Zac.........dude. That's a killer blowthrough in that TII. I think if I had to make that chioce your facing, I would leave the TII alone the way it is. Build you a 1/2 bridge 12A, with a nice size turbo, blowthrough (of coarse), and leave that 1rst gen light as a feather. If you are worried about the torsional stress on the first gen, go with solid engine mounts and we can make a rear of engine sub frame brace. I have had the subframe brace idea in my head for a while. So.......... you bringing that TII up this weekend? BTW, I think you'll like the 83 12AT better now with a fresh coat of paint.

No_Rotor_RX7

hahaha did that!









i abandoned the project tho after getting the FC. i was having traction issues going down the track as it was due to so much torque!!! hahaha

which is making me think i should probably just do a turbo 12a in the fb so it's got even less torque haha but i dunno. i'm SO TORN!

is the weight that much of a difference between the FC and FB?

No_Rotor_RX7

hey buddy, i hope to be out there with the TII. i do have to take care of a couple issues before then tho, because saturday night i have a couple cars to line up with so the FC has to be prepped for battle! WOOWOOOOOO!

twinkletoes

iTrader: (17)

Oh ya, The fb weighs a lot less than a FC. Theres a guy I know that has a v8 fc and he has everything stripped out possible. He said he might only be down to 2,600 lbs. Thats still heavier than a 1st gen.

trochoid

iTrader: (6)

Fbs weigh around 400 lbs less. May not sound like much but it's about 15%, which can make a big difference.

No_Rotor_RX7

hmmm, well i actually just posted the FC up for sale in fs section on this site. i'll see if i can get a decent amount for it as is and then just redo the fb before i go off to college

if it doesn't sell, then i'll do the swap! woowoooo!