Benslidin

I was thinking about putting an SR20DET in an FC i was wondering if anyone new what all was needed or were i could get the cross member from if someone sells them?

1MZFE

iTrader: (9)

There's a specific section of other sites that deals with different motors in these cars, try asking there. A lot of people in the 2nd gen topic are rotary purists.

jmkogut

Why would you downgrade?

TongassT

Location: Navy, eh? They must be doing some chemical warfare testing on unsuspecting sailors again....

need RX7

iTrader: (4)

There's a section on this site for other engine conversions. And honestly, if I were to put a piston engine into an FC it would be a V8, or at least a V6 (not that I'd ever do it)

EDIT: Ok, apparently there's not an other engines section on here (I thought there was? maybe I'm just going crazy) But there are places you can go for such information.

TongassT

Main forum->tech and performance->rotary car performance-> other engine coversions.

The most recent topic: sr20det

need RX7

iTrader: (4)

ah, I see

1MZFE

iTrader: (9)

Yeah I thought there was too, then I looked to double check, and came back to edit my post saying other sites instead of this one.

I shoulda looked harder, I was right the first time.

Good luck, but pistons? Come on.

*TOUCH*

iTrader: (29)

wow, your running two of the same thread. incase you dont check your other one, this is what i posted:

Benslidin

yea i dont know how the other thread came up i only posted once! thanks though

93rx74lyfe

iTrader: (1)

Remove this thought from your mind.

chwkrx7

lol. lay off the guy. i love rotaries and all, but the sr is a sweet motor too. good luck with whatever you decide to do man!

jmkogut

If I ever downgraded to a piston engine, it'd be a V8. I4's just don't have enough power.

veedubbed

Wut.



The SR20 is the 13B's twin separated at birth, one has rotors and one has pistons. Your blanket statement of "I4's don't have enough power" is retarded. SR20 will make over 500 hp on stock internals reliably. There are a handful of 4G63's over 1000 hp.

owen is fat

do it up.
its not a very simple swap but its pretty straight forward.
I guess the big question is why not just build a 240sx?
theyre so similar to an FC that its a lot of "wasted time" stuffing an SR into an FC if that is just the beginning of your project buildup.

I'd rather spend my time and money on a simple LS1 T56 swap, 350hp and 6 speeds of fun to enjoy, hey wait, yeah I did that and it was AMAZING!

but I can respect the light 4 banger turbo philosophy but hp for hp and mpg for mpg and dollar for dollar, its hard to beat the LS1 swap in an FC.

*TOUCH*

iTrader: (29)

+1

jmkogut

I'm not a rotary evangelist, by the way, but before I became interested in rotaries I was a 240 guy. I never actually bought a Silvia front clip, but I was within 2 months of buying one before I switched platforms. That said,

The SR20DET cannot reliably make "over 500 hp on stock internals." Generally the cutoff is 400BHP, anything past that requires upgraded internals. Or you can just try to make 500BHP without upgrading internals, throw a rod, and spend another $2000+ on a new clip or about that much on a rebuild. (I'm not up on the piston engine rebuild process) Even at 400HP, your mileage is going to suck.

Inline 4 cylinder engines just don't have the torque that V8s do. I'm not bashing them (I loved my KA) I'm just saying. If I was going to spend the money swapping out the 13B (Which I would NEVER do) for a piston engine, it would be something worth my money. Chances are, the OP wouldn't even reach 400HP on the SR anyway, it requires a lot of money and a lot of tuning. He'd most likely stick to the ~250BHP that it comes with stock. A stocker LS1, on the other hand, makes around 350BHP.

Personally, I'd recommend finding yourself a TII clip, and swapping it in yourself. It would be so much easier, and you'd get more respect out of the rex community. Not to mention, it was the natural engine for the Rotary Sports Car (X) 7. A clean 13B-RE is an easy source of power. If you take care of it, it'll take care of you.

The 13B and the SR20 are definitely NOT twins separated at birth. The amount of bullshit spewed from that sentence is amazing.

This is like saying the LS1 and the Honda B18 engine are twins separated at birth, one has 4 pistons and the other has 8. Where the hell do you come up with this? 13B-REs and SR20DETs have one thing in common, they're lightweight, turbo engines. That's IT. They are not twins, in any way, manner, or respect of the word "twin." If you still think they're alike, you should really read up on the internals of a Wankel and then we can talk.

rxspeed7

iTrader: (5)

^^^ man not to bash you but you know nothing about a sr20det. i have on will a gt2871r on a stock manifold with stock inj and a tuned ecu making 330whp and getting 25mpg on the highway and 15 in the city. and you can reliably make 450 on stock internals with a good tune and have no drivability problem what so ever. they are so abbundant now and there are so many people that have made gobs of power and be more reliably than any rx7. don't think i know nothing about rotaries either i have had my turbo II for 5 and i would never trade that car for anything in the world, nothing feels and drives like a rx7. its not only the engine that makes a rx7 a rx7. plus why would you want to throw off the weight distribuion by putting a ls1? dont get me wrong if i had one laying around it would be in a fc but why not if your not going for much power put a potent 4 cyl thats cheap and can make decent power for not much. and anothr thing the design of the chassis way surpasses that of a 240. thats probably why the op wants to put a sr in a rx7

darkprince134

iTrader: (5)

dude....i wish they came out with some more engine conversions for the FC besides the vg(which isnt really anything besides mounts/d-shaft)



but ya,if anyone ever produces a kit for it....im ***** deep in it....ive even thought about doing a ka-t to mine...but it still comes down to i want a bolt in kit





mabye if we get a big enough intrest in it mabye we can have granny speed shop make a kit,,that'd be cool




and for all the haters of the idea

really....when was the last time you went to a junk yard and they sold you a rotary engine with a warranty????

i love the rotary and all....but when it pops....its not too cheap to replace it

jmkogut

Unlike piston engines, it's incredibly difficult to induce catastrophic failure in a rotary engine. They don't "pop," they degrade performance until eventually you just get no power out of them, or it just refuses to start. In which case, someone who knows what they're doing can generally get it to run with a bit of work. (It'll still probably need a rebuild though) Anyone with mechanical skill and a couple of weeks can rebuild a rotary engine. It's been documented countless times. My friend here did it in 3 days with no previous experience. Granted, he rushed and it wasn't a perfect job, but he did it and makes excellent compression (I believe he claimed 110/105 psi front/rear).

But it's your car, your choice. Do what makes you happiest.

Christopher W.

iTrader: (2)

For the 1,000,000 time the LSX engines don't throw off the weight distribution. You are obviously speaking from your emotions not facts. That is a lame *** way to go about building a car.

jmkogut

I wasn't going to go there, an LS1 with tranny weighs more than a KA24DE with tranny, but not by much. The LSx is all aluminum, has a plastic intake system, etcetera.

No amount of lightening can change the fact that it's still a V8 and it's a HUGE hunk of metal.

A 13B on the other hand, is a light *** engine. I don't have the facts to back this up, but there's no way the LS1 weighs anywhere close to the 13B or even the 13BT.

That said, the power gains are more than enough to make up for the weight transfer. That's nothing extra weight in the rear couldn't balance out.

Christopher W.

iTrader: (2)

^^^ I assumed that it would be a big difference as well. But I have seen that when you add up all of the turbo and accessories that it is suprisingly close. I have been trying to find the information on the V8 RX-7 forum but can't find it at the moment. There is a lot of information out there but you have to compare apples to apples. I think that a true comparison I read over on that forum said that the LSX engine was something like 70lbs heavier than the 13B and all of the turbo stuff. Just move the battery to the back and there you go.

The real truth is in the handling and everyone on the V8 RX-7 forum says they cannot tell a difference in the handling just the wicked torque difference. '

I did quite a bit of investigating. I am currently doing a 20B N/A in my FC. I was waffling back and forth about the LSx engine almost hourly a while back. I mean it was actually driving myself a bit crazy. Now I am firmly into the 20B build. Actually Defined Autoworks is doing the engine build and install. Sometimes I wish I had just gone the easy way.....but I will be very happy when it is all said and done.

My point was that in the real world there is not a down side to the swap....unless you are a purist. I would of gone with the LSX engine if my car wasn't sure a perfect example of a GTUs. If I had a average condition FC I would definitely do the conversion.

I am a gear head first.....rotary head second.

Not that this is the place for the LSX vs. 13BT discussion but I wish someone would chime in that had the exact figures.

jmkogut

I'm a rotary purist, personally, but at the same time, I realize that not everyone sees it how I do and I have no qualms with what they do to their cars.

I would LOVE to drive an LS1 '7 and a 20B-RE '7. It'd be nice to compare.

owen is fat

ha.
driving an LS1'd FC and a highly modded n/a 13b FC back to back was what sold me on doing my own LS1FC and it was well worth it.
especially considering how cheap I found a '98 LS1 and then a local T56, it made the whole project come together easily and on the cheap, I used a lot of stock LS1 parts to keep it simple and still had 350hp/350tq and amazing short gearing but a long 6th gear to get 28+mpg on the highway.

dont get me wrong, an SR20 FC would be fun. same for a 20B FC. theyre fun. nobody doubts that.
but to me an LS1 FC was just a itty bit more money and was MUCH more fun and had gobs of torque while still be super easy to drive and gave me no headaches as it was all oem stock motor/internals/computer/etc., it was so easy and lasted for so long without any problems.