What to know about V8 rx7's?
what should I know about building/swapping an Ls into a RX7? I sold my stock 93 rx7 a few years ago and regret it, so now I'm wanting to find another one and swap an LS into it. But before I do what's everything I need to take into consideration when building it? The stock motor and trans will be coming out for sure but I have never done anything like this before so not sure where to start other than knowing what motor I want. I plan on going with an Ls3 Erod crate motor from GM. That way I don't have to take a trip to the state ref.
Anyone want to chime in and give me some pros and cons before I embark on this journey? |
I can think of alot more pro's that I can think of con's on this kind of project. Honestly every one I've seen is a ton of fun!
If you need any assistance with the swap we offer a complete swap package for these to simplify the process. Mazda RX7 FD LSx Swap Kits - Sikky Manufacturing |
That was going to be my next question. Do I just use any mounting kit for any of the ls motors? I plan on using an LS3. And how do the kits differ from each other? Are some stronger or different positioning or how does that go?
I would like to have most of this figured out before I start the project just so I have all the parts needed from start to finish so the car isn't down for too long. is any fabrication needed when doing this kind of swap? |
So all of the motors in the LS family share engine mounting locations so you are free to switch between them as far as the mounting situation goes.
The two kits we offer just vary in completeness, one comes with a harness and the other does not. As far as strength goes our mounts are as durable as a mount can be, they are machined out of a solid block of 6061 Aluminum. Our kit we offer minimizes the fabrication needed on this kind of swap. However some small things will need to be done (exhaust, coolant hoses, etc...). |
So some thoughts/advice I would have for someone about to do the swap:
1. Put a big cam in the car. The blop blop blop sounds so good and when you hear other people with cams you will want one, so may as well do it from the start to not have to take the whole thing apart again. 2. Transmission. For the ease of not doing work over I would go ahead and do a built up T56 or a T56 Magnum from the start. I ran a stock T56 and we ended up doing double the work when it blew and we upgraded to a T56 Magnum, would have saved a lot of labor/time to just do it from the beginning. That's all I can think of at this second but I'll pop back in if something comes to mind. They are super fun cars with the swap and you will absolutely love driving it around. |
Oh ok cool. So as far as the mounting goes there is no need for any kind of fabrication mounting the motor? It's straight forward just bolt up the brackets and bolt up the motor correct??
yeah I was planning on canning and having the tranny built up, I don't want to do things a second time lol do you know if you can keep ac, heater, power steering etc when having an LS rx7? Is there space for it? Where I live we get cold for like 3 months and that's about it lol the rest of the time it's warm so I want to make sure running an AC would be possible. |
Yes, depending on what parts you are using, some kits can be better imo. I have parts from Hinson, Samberg, and Sikky; the sikky kit is the newest and the parts are very well made, I have the shifter on my T56 Magnum. I have some Hinson swap parts, as my car is an older swap, as well as a Samberg rear subframe and rear diff mount as they seemed like an easier choice for my rear end setup.
I'm in Texas so A/C is necessary, lol. You have plenty of room (a ton more if you are removing the abs), my car has everything working except the cruise control. |
SP_Rocket Oh ok cool. So as far as the mounting goes there is no need for any kind of fabrication mounting the motor? It's straight forward just bolt up the brackets and bolt up the motor correct?? There are two ways of doing it that I am aware of. Aftermarket subframe and relocated steering rack with bumpsteer correction - the old standard. And then to comply with Formula D or something (need stock subframe on swaps), 20 years later Sikky found you could just make a custom oil pan and keep the stock FD subframe complete with steering rack location. |
So it sounds like sikky is the way to go if it takes the complication away. So now that I know which mounting kit to go with here's the next question. The rear end....is assuming the stock rear end will have to come out, so what rear end should I go with? My overall plan is to daily the car and occasionally road course it.
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Just a heads up while were on the top we are having a black Friday sale next week. So if your in the market it's a good way to save!
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Oh sweet! I don't have the car just yet! But I'm hoping by next week to have it so this way I can get that deal. I don't think I'd need the wiring harness, so what deal would I get next week for the mounting kit without the harness?
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The stage one kit is what you would need.
Mazda RX7 LSx Mount Kit - Sikky Reg price - 1799.99 Black Friday - 1529.99 Also free shipping |
The car will feel a little different after the swap. No question for anything straight line, the motor can be a monster.
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Originally Posted by Supernaut
(Post 12125352)
The car will feel a little different after the swap. No question for anything straight line, the motor can be a monster.
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Originally Posted by SP_Rocket
(Post 12125375)
Yeah I'm sure it'll feel a bit heavier but I'm sure the power will more than make up for it. I want to set this car up for a road coarse more than straight lines so we'll see how this project turns out.
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Originally Posted by Supernaut
(Post 12125448)
In terms of lap times, I'm sure the power and ease of drivability will help but for me, in terms of fun, that heavier feeling took just enough out of what I loved about the car. Even though the change was slight and handling was still awesome, it was enough for me to strongly prefer my rotary FD. I'm not bagging on v8 FDs, it's just for me, and more importantly, maybe you, might not like the car as much as you think you would after the transformation. I hope you have a friend that has a swapped car that will let you drive it. It would be wise to try it first.
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If you put a cam in an Erod, it is no longer smog legal.. so try that at your own peril.
In an FD it is actually very easy to keep the 50/50 weight balance when performing an LS swap so it won't handle much different at all. Additionally the swap is about weight neutral. By the time you are done the car weighs about the same. This is very well documented in many FD swaps. Also look at the Ronin/Samberg engine swap kit. That has been the standard for many years. |
Originally Posted by LargeOrangeFont
(Post 12125720)
If you put a cam in an Erod, it is no longer smog legal.. so try that at your own peril.
In an FD it is actually very easy to keep the 50/50 weight balance when performing an LS swap so it won't handle much different at all. Additionally the swap is about weight neutral. By the time you are done the car weighs about the same. This is very well documented in many FD swaps. Also look at the Ronin/Samberg engine swap kit. That has been the standard for many years. |
There is little fab needed with either mount kit. There is some cutting and clearancing needed, but not welding and fabrication.
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My original FD with LS1/T56 and factory rear 3:90 diff running, 13" brakes, 18x10.5 CCW's 285/30/18's all around was 2800lbs with 50/50 weight distribution and full tank of fuel Touring edition (sunroof). Heavy dual 3" exhaust, all stock glass/body panels, no a/c. The car pulled 1.13g's on the skidpad in 2005 for the Sport Compact Car Mag USCC so anyone that says the cars handling is upset..... doesn't own a properly sorted swap.
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Originally Posted by gnx7
(Post 12125805)
My original FD with LS1/T56 and factory rear 3:90 diff running, 13" brakes, 18x10.5 CCW's 285/30/18's all around was 2800lbs with 50/50 weight distribution and full tank of fuel Touring edition (sunroof). Heavy dual 3" exhaust, all stock glass/body panels, no a/c. The car pulled 1.13g's on the skidpad in 2005 for the Sport Compact Car Mag USCC so anyone that says the cars handling is upset..... doesn't own a properly sorted swap.
i still have that issue of scc ... the build inspiration behind my car from day 1 |
I too am on the path for a V8 swap. I'm torn right now, and just about ready to pull the trigger on the swap kit. I am looking to learn a bit more about the Sikky kit before I commit. Plus, would love to jump in on a deal if they have one again soon!
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The only thing I can tell you is to tally up the total $ for all the parts and labor you think you'll need to get it done, then multiply that by 2x or 3x and then BOOM you've got yourself the actual cost for a completed V8 rx7. Aside from that enjoy the journey! :icon_tup: :nod:
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Originally Posted by erotomania
(Post 12235973)
The only thing I can tell you is to tally up the total $ for all the parts and labor you think you'll need to get it done, then multiply that by 2x or 3x and then BOOM you've got yourself the actual cost for a completed V8 rx7. Aside from that enjoy the journey! :icon_tup: :nod:
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True about the info. I need to do the swap and have no idea which way to go. Appreciate it
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