It’s amazing how small the engine is and how much room that opens up for things like a tilted radiator and extractor hood. The weight balance must also be somewhat rear biased, which could be really interesting.
Yeah, it frees up a lot of room under the hood. I know you aero nuts are going to love it haha! It does take a good bit of weight off the front, yes. Turn in is much more eager, lots of front grip. It requires a slightly different approach to suspension setup when compared to a standard Miata.
It's the stock fuel pump with an adjustable fpr. However, depending on your donor car, you may not need to change the fpr. The busa has a returnless fuel system running at 43psi.
Good question! Unless there's a difference between the manual and automatic tubs, I can't imagine it would. Actually, I think there's the potential to simplify the process adding a clutch lever instead of the pedal. If you went with the paddle shift option, you could mount a hydraulic clutch lever to the trans tunnel. This way you wouldn't have to cut a hole in the fire wall and mount the clutch pedal.
How is the gearing with the hayabusa sitting in the ~2.5:1 ratio range and Miata averaging in the ~4.0:1. Top speed on a swap like this? Can they be boosted?
We replace the sprocket with a driveshaft flange and a 2 piece driveshaft, and then pair with any of the commonly available Miata diffs. The 4.3 diff will yield a 100mph top speed, while the 3.6 diff will yield a 130mph speed on standard 15" wheels/tires. They can be boosted up to 7psi reliably on stock engine. Check out our FAQ's spec13motorsports.com/blogs/news/frequently-asked-questions-faqs
The paddle shifters work beautifully and allow electronic clutchless upshifts! We also offer a manual cable actuated shifter, but not nearly as cool in our opinion.
Correct! We use the Hayabusa transmissible. This saves a ton of weight and complexity. Check our FAQ's spec13motorsports.com/blogs/news/frequently-asked-questions-faqs
How do you think this engine and gearbox would fare as a competition drift car? I think lightness is key but I'm concerned about how the gearbox will hold up to repetitive clutch kicks.
For your application, I would upgrade the clutch basket and clutch springs. Other than that, I don't see any reason it wouldn't hold up really well. I plan to attend some drift events this year for testing/promotion.
@@spec13motorsports Thanks for getting back to me. I see in some of your other comments that you are limiting the top speed to 100mph due to concerns of excessive load, is that right, and if so, why?
@jaiden270274 No, we're not restricting speed to 100mph. The Miata in our first video at Palmer was equipped with a 4.3 diff, which will yield a 100mph top speed. But nothing is overloaded if speeds are kept below 127mph, which the 3.6 Miata diff will hit with this swap. Check out our FAQ on our website: spec13motorsports.com/blogs/news/frequently-asked-questions-faqs
Also you mentioned the idea of branching out to other vehicles - I am interested in the feasibility of swapping the first gen 86/brz twins, any thoughts on the platform? Does this sort of powertrain make sense in a heavier chassis such as this? Any concern with communication to the modern ECU's? Very excited to keep tabs on what you guys are doing here.
@austinhamilton9537 we're exploring the BRZ/FRS, but I'm afraid top speed would have to be pretty limited to keep loading down and ensure reliability. We've only tested with the stock ecu with a Schnitz Racing tune, but we're working on a project that will allow us to experiment with the ecu more
No, we are running stock pulling system on both test mules. We haven't had any issues with oil pressure with either, but if you wanted extra assurance, you could get an upgraded oil pump gear and high pressure bypass valve from schnitz racing.
@peanutbutterpadre1519 yeah, it must not be as much of an issue with the Hayabusa. They've proven to be a very reliable car power plant on track. The Thunder Roadster GTR uses the Hayabusa power plant, and their rules only allow the high pressure bypass valve and oil pump gear, which tells me it's not a concern because then the rules would allow for dry sump, accusump, baffled pan etc.
We're not doing installations, just producing the kit. The right hand drive version is not yet available as clearance issues with the steering shaft will need to be addressed.
This is sick definitely want to see how it holds up to drift applications especially with oil starvation. Ive owned several bikes and the abuse to a motorcycle engine is insane they just take a beating...this is very impressive and would love to see a video as a how to guide for this exact swap. What are the steps ? I gotta know
This would be an awesome drift build. Using the 4.3 or 4.1 diff would give you incredible torque multiplication. Plus the swap moves the weight distribution back a little bit, which will help with inertia drifting. We've done lots of track testing over the last two years, and oil pressure hasn't been an issue. Even with tons of aero and race tires from our spec Miata we never saw any big dips in oil pressure. However for added protection we do recommend running an oil pan baffle. They're available for about $50 from Schnitz racing. Once the first few kits ship in the coming weeks, I'll be working with one of my customers to make an install video. It's an incredibly easy install. After the initial installation, the engine can be removed in 30 minutes or so, making it pretty doable at the track. The initial install requires 4 holes to be drilled in the tub of the Miata for the engine mounts, and two more for the drive shaft carrier bearing mount. Then you pretty much drop the engine in, wiring harness and all, connect the fuel pump wires to the stock busa fuel pump harness and you're off to the races, so to speak.
Pre-orders are live on the website now!
Www.spec13motorsports.com
It’s amazing how small the engine is and how much room that opens up for things like a tilted radiator and extractor hood. The weight balance must also be somewhat rear biased, which could be really interesting.
Yeah, it frees up a lot of room under the hood. I know you aero nuts are going to love it haha! It does take a good bit of weight off the front, yes. Turn in is much more eager, lots of front grip. It requires a slightly different approach to suspension setup when compared to a standard Miata.
super cool! I hope I get to see one in person some time!
What are you doing for fuel and miata specific electronics such as lights/pop up headlight motors.
It's the stock fuel pump with an adjustable fpr. However, depending on your donor car, you may not need to change the fpr. The busa has a returnless fuel system running at 43psi.
@@spec13motorsports Oh so its pretty identical to the NA fuel system.
Elite Racing Transmissions makes a 1:1 reverse box rated at 300ftlb of torq. $1200 USD
Would it significantly complicate the install for an auto miata?
Good question! Unless there's a difference between the manual and automatic tubs, I can't imagine it would. Actually, I think there's the potential to simplify the process adding a clutch lever instead of the pedal. If you went with the paddle shift option, you could mount a hydraulic clutch lever to the trans tunnel. This way you wouldn't have to cut a hole in the fire wall and mount the clutch pedal.
How is the gearing with the hayabusa sitting in the ~2.5:1 ratio range and Miata averaging in the ~4.0:1. Top speed on a swap like this? Can they be boosted?
We replace the sprocket with a driveshaft flange and a 2 piece driveshaft, and then pair with any of the commonly available Miata diffs. The 4.3 diff will yield a 100mph top speed, while the 3.6 diff will yield a 130mph speed on standard 15" wheels/tires.
They can be boosted up to 7psi reliably on stock engine.
Check out our FAQ's
spec13motorsports.com/blogs/news/frequently-asked-questions-faqs
I love the radical in Iracing, Def would give up my 5 cylinder swap for this. Not sure if paddle shifters could work with this
The paddle shifters work beautifully and allow electronic clutchless upshifts! We also offer a manual cable actuated shifter, but not nearly as cool in our opinion.
So I’m assuming you can’t use the stock Miata trans and do you guys use the stock hayabusa trans
Correct! We use the Hayabusa transmissible. This saves a ton of weight and complexity.
Check our FAQ's
spec13motorsports.com/blogs/news/frequently-asked-questions-faqs
How do you think this engine and gearbox would fare as a competition drift car? I think lightness is key but I'm concerned about how the gearbox will hold up to repetitive clutch kicks.
For your application, I would upgrade the clutch basket and clutch springs. Other than that, I don't see any reason it wouldn't hold up really well. I plan to attend some drift events this year for testing/promotion.
@@spec13motorsports Thanks for getting back to me. I see in some of your other comments that you are limiting the top speed to 100mph due to concerns of excessive load, is that right, and if so, why?
@jaiden270274 No, we're not restricting speed to 100mph. The Miata in our first video at Palmer was equipped with a 4.3 diff, which will yield a 100mph top speed. But nothing is overloaded if speeds are kept below 127mph, which the 3.6 Miata diff will hit with this swap. Check out our FAQ on our website:
spec13motorsports.com/blogs/news/frequently-asked-questions-faqs
@@spec13motorsports thank you, that FAQ is very informative.
@@jaiden270274 let me know if you have any other questions! I think this would make an awesome drift build.
How is the underhood fitment with the 3D printed intake manifold? any hood cutting required?
Also you mentioned the idea of branching out to other vehicles - I am interested in the feasibility of swapping the first gen 86/brz twins, any thoughts on the platform? Does this sort of powertrain make sense in a heavier chassis such as this? Any concern with communication to the modern ECU's? Very excited to keep tabs on what you guys are doing here.
The under hood fitment with the available intake manifold is tight, but no cutting is required.
@austinhamilton9537 we're exploring the BRZ/FRS, but I'm afraid top speed would have to be pretty limited to keep loading down and ensure reliability. We've only tested with the stock ecu with a Schnitz Racing tune, but we're working on a project that will allow us to experiment with the ecu more
Did you change the oil pickup/sump at all?
No, we are running stock pulling system on both test mules. We haven't had any issues with oil pressure with either, but if you wanted extra assurance, you could get an upgraded oil pump gear and high pressure bypass valve from schnitz racing.
@@spec13motorsports I have just heard of oil starvation problems with motorcycle engines on track but its cool you haven't had problems
@peanutbutterpadre1519 yeah, it must not be as much of an issue with the Hayabusa. They've proven to be a very reliable car power plant on track. The Thunder Roadster GTR uses the Hayabusa power plant, and their rules only allow the high pressure bypass valve and oil pump gear, which tells me it's not a concern because then the rules would allow for dry sump, accusump, baffled pan etc.
How much would you charge to do a rhd install?
We're not doing installations, just producing the kit. The right hand drive version is not yet available as clearance issues with the steering shaft will need to be addressed.
are the kits being shipped?
Almost! We are starting to fill orders. We spent yesterday welding up some sets of headers. Check Facebook and Instagram later today for an update.
This is sick definitely want to see how it holds up to drift applications especially with oil starvation. Ive owned several bikes and the abuse to a motorcycle engine is insane they just take a beating...this is very impressive and would love to see a video as a how to guide for this exact swap. What are the steps ? I gotta know
This would be an awesome drift build. Using the 4.3 or 4.1 diff would give you incredible torque multiplication. Plus the swap moves the weight distribution back a little bit, which will help with inertia drifting. We've done lots of track testing over the last two years, and oil pressure hasn't been an issue. Even with tons of aero and race tires from our spec Miata we never saw any big dips in oil pressure. However for added protection we do recommend running an oil pan baffle. They're available for about $50 from Schnitz racing. Once the first few kits ship in the coming weeks, I'll be working with one of my customers to make an install video. It's an incredibly easy install. After the initial installation, the engine can be removed in 30 minutes or so, making it pretty doable at the track. The initial install requires 4 holes to be drilled in the tub of the Miata for the engine mounts, and two more for the drive shaft carrier bearing mount. Then you pretty much drop the engine in, wiring harness and all, connect the fuel pump wires to the stock busa fuel pump harness and you're off to the races, so to speak.