First off i would like to start off with that i know that this question has been debated on this website however they all seemed to turn into an arguement and they didnt answer the questions that i have. From what i have read there is no one who has done a renesis swap (i could be wrong). I understand that the renesis has less power than a 13b-rew however the renesis is n/a. In my opnion it seems that a PROPERLY turboed renesis will make more power than a LIGHTLY modified 13b-rew. Also a n/a renesis would be a much better in terms of reliability imo . I am fully aware that the six speed is weak. My main question is can it be done ( i know that with enough money and time it can be done) but does anybody know approxmately how much time and money, are there any clearance issues or smething major that i am missing. My reason for asking is i am planing to buy a roller fd soon and trying to consider my options. I am not looking to make big horsepower i dont want to hear about a 3 rotor swap. i personally dont care about them. (dont flame) If nobody has done this then i will definately try to do this and post pics, if it can be done or not. Remember i do not want to start an arguement. I had seen a picture of an fd which claimed to have a 6 speed in it and the shifter was a couple of inches from the stock location. Would this be a problem if the car had a renesis motor in it?

 

I think it's a silly idea. Drop in a 13B-REW and be done with it. side exhaust ports are a step backwards (when it comes to a boosted motor) in my opinion.

 

Well, I don't know about that. Here are some stats on FI RX8's:

http://www.rx8club.com/showpost.php?...26&postcount=1

You can easily & "reliably" obtain those numbers use the stock twin turbos and the 13B-REW. Your "reliability" is only as good as your tuning, and that's going to be the common link between the two.

IMO, unless you just want to be unique, it's going to be more effort than it's going to be worth performance or reliability wise. Keep in mind, the 13B-REW was designed to be FI from the start, the Renesis was not.

 

The Renesis is a great motor for what it is. Compare it to the 89-91 nonturbo rotaries and you will see that it has something like 80% less emissions, similar gas mileage, yet 50 more horsepower to the wheels or so (mid 120's vs mid 170's. yes many/most dyno in the 170's, not the 180's, depending on dyno conditions etc) and more torque. unless you have insane fabrication and tuning skills (and money to blow) don't try this.

 

the renesis is not meant to be fi . not how it was designed. everyones thought about to be original, but no.

 

Basically if you're going to drop in an engine that isn't a 13B-REW you're creating more work.

For the amount of hassle involved, I personally think going V8 or 20B make the most sense, 20B being the less practical of the two. But the rewards are great.

Putting in a renesis is harder than a 13B-REW, but for less reward. Granted, it doesn't compare to a 20B swap, but it's far from a drop-in. By putting that time/money into a 13B-REW you can do some pretty intense stuff. I don't think it's worth it, but that's your decision.

 

honestly i think, if you have the time and money for a project like this, and you think you/shops tuning would be good on this, then go for it, i have not seen this done before and if it didnt work out like you hoped, sell the renesis off and swap in your REW, as long as you got extra time and money go for it. I would love to see the end results in this kind of project. and as for the transmission sitting different, i think its going to end up in that same position as the picture you seen ( i seen the same picture your talking about), unless that area of the engine is a little longer. or if there is room in the back, you could fabricate your own mounts to sit back an inch or so to help it out.

 

I saw 2 FD3Ss in japan that were in the 350 hp range (stock twins) running the renesis 6 speed transmissions. Both were cars that R magic did for clients. I saw one roller being prepped as a track car that was going to run a ported renesis engine with individual throttle bodies.

It has been done before, and it can be done if you have the cash, and resources. Custom work is a given (needed).

 

If you want the Renesis, why dont you just get an RX-8? Seems to be more like what youre interested in...FD with less power, more expensive, WHY? 6 gears that important?

 

it can be done, like it was said above, but you're going to need some good fab skills. Yes, it will be unique, but why would you want to spend all that money to reduce your performance? I know you don't want to go with a 20b, but if you don't turbo it you aren't looking at nearly the expense. A solid, street port 20b will give what, 350 whp n/a, and 300+ lb-ft of torque. yes, it's a bit heavier and you'll get worse gas mileage, but it'll be more reliable than the renesis.

The Renesis CAN be done, but WHY is the real question.

 

FYI the renny 6sp trans is a lot weaker than the FD/FC turbo gearboxes. They barely hold up to the torque of a stock rx8.

I would probably not consider a renny in an FD because the mounts, plumbing, and electronics are totally different. The best thing you can do is just go with a stock rebuilt rew, completely go through the fuel and cooling system, use new gaskets on the install, and either run a small sized single roughly equivalent to the airflow of the stock twins, or run a set of rebuilt twins. You can be pretty reliable for years this way, and if you learn how to drive the car just right, you can stay out of boost and get good mpg (20-24) as well.

Oh, and as an rx8 owner, the thing (within reason, budget considered) that I'd most like to do with the car is do a no-emissions REW swap with sequential twins, intake and exhaust and let it be. It would be a lot more fun that way.

 

Another thread about Renesis in an FD.. GOD WHY?? I wonder where in the hell these kids get this info??? Stop listening to some 8 owner who doesn't know a thing about rotaries..

If you want this damn engine, then get an RX8! RX8s are getting so cheap, its almost the same cost as decent condition FD. 8 handles well, more comfortable, gets worse gas than FDs, and suspensions are newer.. So get an 8 if you want the engine

 

At least its a little more interesting than the 2 page BOV thread we had last week....

 

haha 100% true... i did some research on this after i made the last post... and i found some with the renesis in it... those guys have MAJOR cash into those cars, and tons of fab hours.... dont do it, for the sake of your time and money, its a waste. with the money put into this project along with time, you could make an AMAZING 13b-rew

 

I understand what you guys are saying, but it seems to me that it is a lot of work, but i dont understand why. it seems that one would have to make motormounts, transmission mounts and a couple of other miscelanious stuff to make it work. what else am i missing? I can do the fab work myself, that is not a problem. And if i use the motor in it's stock form, then there would be no tuning that would have to be done; untill it is turboed or supercharged. Does any body know what a stock fd has horsepower wise to the rear wheels? The reason why i was thinking of doing this swap is because it is fairly unique. also i dont like the look of the rx8. does anybody happen to know the distance from the back of the 13b-rew to the shifter, and the distance from the back of the renesis motor to the shifter?

 

The renesis trans/shifter sits farther forward in the cockpit. You'd want to keep the clutch-back drivetrain FD, and just put the renny in front of it.

The renesis is VERY electronics dependent so you will likely need to find a whole partscar to pull wiring from. The PCM/ECU is not very easy to work with, unlike the earlier rx-7 computers. I am telling you this will not be remotely easy. I think the only feasible way to do it would be a standalone.

 

Give it a try and let us know how bad it is.

 

A healthy stock FD will be about 215-220rwhp.

 

And a stock or modded RX8 puts down about 170-190 rwhp.

- custom motor mount setup
- PPF modification or some other means of keeping the tranny and diff properly mounted and such
- custom driveshaft
- RX8 fuel system is returnless so that needs to be modded
- RX8 uses an ethrottle so you'd need a standalone or lots of wiring
- rear gears should be updated also as the RX8 uses 4.44 gearing compared to an FD 4.10

Lots of work and parts for not much benefit.

 

Just buy an 8. I have both and they serve their purpose. Renesis is a step backwards for an FD IMO, but if you have the time/money/resources... don't let anybody discourage you. Do what you want, isn't that what this hobby is all about?

 

^ don't be so encouraging, because then he may actually execute this dump idea.

 

You mean NO benefit right?

 

Its your car, do what you want man. Its understandable if you like the looks of a 7 but want the reliability of a 8. (thats if you keep it N/A like what it's designed for). I'm sure the engine will last a lot longer and probably won't throw off the weight distribution as much as droping in a V8, I6, I4.

but then again, who has the patience to stay NA when you've been spoiled by the turbos boost. If you want to drop in a turbo for the renesis, you're better off staying with 13B-Rew

 

In reality, the renesis has not really proven itself dramatically more reliable than a well built, reliability-modded turbo rotary. I have one of the highest mileage renesis' in the country that is still original, but there are a lot of 30-50k mile renesis that are getting replaced as we speak. A properly setup 13brew with light mods can make 100+hp/tq and still last that long or longer.

 

I dont get why you want to make an FD slower. The point is there are plenty of unique cars that suck. Like this car Dont be someone who ruins a car just to be different.