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Discussion Starter · #1 · (Edited)
I am on a quest...To transform a great car into my dream car.
to supercharge the Skyactiv 2.5L. I want the peak power of the 2.5T with the broad power band of the 2.5L.
Goal: To be on par with e46 M3 or Civic Type R. (and way faster than the Skyactiv 2.5T: less torque, more horsepower).
I initially thought I would pursue cobbling together my own kit (Considering Supercharger on Skyactiv)
But am now pursuing VT-Racing, Chinese company, twin-screw supercharger for 2.0L or 2.5L Skyactiv engines (launched in early 2019 in China).

I've been in regular contact with the company since Jan 2021. Mine is the first supercharged Skyactiv 4-door in the world, outside China, a pioneer :cool: (both scary and cool)


UPDATE 11/2021 - 7 months, 6000 miles, multiple AutoX racing events, lots of hard driving and daily commute, everything is great, still amazed at the mpg, same 35-36 freeway, -1-4 in-town

Started FB group: "Skyactiv-G Super/Turbo Community" (if you're going to do this, come join us, currently 4 of us running the supercharger, 3 others awaiting delivery)

Skyactiv Supercharging Guide
Supercharging at a glance summary:
Cost - $4,500usd (kit, S&H, spark plugs), $5k+ depending on extras.
Purchasing - No proper international store front, have to work around that...
Purchasing Contact - IG: Jiasusupercharger, WhatsApp:+86 159 1882-2540
Tuning - Provided as part of the kit, but it is a very censervative tune. DrTuned is now partnering with one of the early adopters, and will be officially supporting tuning for the Supercharger kit.
Power - 250-270whp+ (old kit on stock cx5 dyno’d at 243whp), there’s possibility of smaller pulley to increase boost, or cams/etc., in the future…
Feeling - Way faster than that power number sounds like. Instant power at every RPM that builds more and more power all the way to redline. There’s always boost when needed, pushing 40% more air!
Efficiency - On the freeway, no loss in MPG, in-town generally -1-4mpg depending on how heavy your foot is (when not pushing it, can get as good MPG as N/A motor).


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UPDATE 7/12 - 2 months & 1400 miles with the supercharger and it has been great, exceeded my expectations!
for more info read on in this thread or check out my YT channel
243278



UPDATE 4/25 - SUPERCHARGER IS INSTALLED AND RUNNING!
It feels great on the road, with a lovely "zingy" sound when on the throttle, but when idling or cruising it almost sounds stock (250-300HP crank). Power just builds and builds as the RPM goes up with peak HP at red-line.
Vehicle Motor vehicle Automotive tire Hood Automotive design

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Complimentary PARTS
1. Spark Plugs (reqired) - need to run colder heat range, found NGKs that are slightly smaller gap (.31" vs .44") and one step colder heat range (8 vs 7)
These are actually OE on Nissan GTR ;)
2. Oil Cooler (recommended) - adding 30% more power means more heat, adding thermostatic oil cooler should help longevity. This kit is made for an ND Miata so the oil filter plate will fit fine, and was able to use one of the brackets to leverage intercooler mounting point.
3. Oil Catch Can - adding forced induction will likely increase blow by and I want to keep the twin screws clean for a long life.
4. Liquid Chill - coolant additive proven to modify surface tension/conductivity characteristics of liquid to increase cooling capacity, drop temps by 25f
5. Boost gauge and Oil Pressure/temp gauges - To have better visibility of what's happening when I'm pushing the car on track or any time. I found a two in one gauge for oil pressure and temperature, plus matching boost gauge. Both are digital so even though the boost will only go up to 6psi I can see exactly where it's at.
Oil Pressure/Temperature Gauge Kit
Digital Boost Gauge Kit
6. Antigravity ATX30-RS 5.5lb, 880CA Battery - to help compensate for the additional weight of the supercharger kit (40-80lbs) switching to ultra light 5.5lb battery can drop 40lbs to help offset. Antigravity also has a bluetooth battery tracker that I was going to install to keep tabs on the health of the battery.
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*Note: VT-Racing has not installed their kit on any Skyactiv with manual transmissions (mostly CX5s and some 6s), and are not sure how it would handle it. They did seem open to using a softer spring on the bypass valve to lower the peak psi to potentially be livable for manuals.
The good news is they claim the automatic has no problem at all with it, same transmission used with the 2.5T and this will be less torque than that (more horsepower)

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Watching closely, Dan. Good luck; I hope all goes smoothly.

If boost goes with rpm (alone???; throttle must play a role??) it seems to me that transaxle torque capacity aside (and I hasten to point out that that may be a big issue) - a manual transaxle may work reasonably well it seems to me. I say this cuz automatics usually are great with turbos cuz there is no (or there is little) throttle lift upon shifting and boost is not lost like it is with a manual. Am I right in this supposition re superchargers?
 

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Discussion Starter · #3 ·
Watching closely, Dan. Good luck; I hope all goes smoothly.

If boost goes with rpm (alone???; throttle must play a role??) it seems to me that transaxle torque capacity aside (and I hasten to point out that that may be a big issue) - a manual transaxle may work reasonably well it seems to me. I say this cuz automatics usually are great with turbos cuz there is no (or there is little) throttle lift upon shifting and boost is not lost like it is with a manual. Am I right in this supposition re superchargers?
Yes, supercharger will not have the turbo lag problem that can happen with manuals.

To your other question: the supercharger is mechanically connected to the motor and will pump a set amount of air at a given rpm. What the throttle changes is how much air is allowed through. So if there was no bypass valve than pressure would get out of control when at high rpm and low throttle.
 
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What are they going to do about the stock compression ratio. Its already sky high.....not great for adding FI.
What is their answer.....dump more fuel to cool the charge.....
Do you get new injectors?
Good point re injectors. This setup does have the possibility of using substantially more fuel, what with the supercharger's parasitic drag + adding fuel to further charge-cool. Hopefully i) the charge-cooler in the kit is very efficient; and ii) the cam phasor can do its job to reduce the effective CR.
 

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Good luck Dan and keep us posted! Should be a fun adventure to follow :)
 

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Discussion Starter · #7 ·
What are they going to do about the stock compression ratio. Its already sky high.....not great for adding FI.
What is their answer.....dump more fuel to cool the charge.....
Do you get new injectors?
Good point re injectors. This setup does have the possibility of using substantially more fuel, what with the supercharger's parasitic drag + adding fuel to further charge-cool. Hopefully i) the charge-cooler in the kit is very efficient; and ii) the cam phasor can do its job to reduce the effective CR.
Well the sky high compression ratio is why even if the engine were strong enough (which I doubt since it's so light) we can't run a lot of boost.

Re: Fuel & Heat-
1) at 6psi that's only a theoretical 30% increase in air volume, so it seems the existing injectors can handle a 20-30% increase in peak duty cycle...
2) Superchargers always produce less heat because they're not involving hot exhaust gasses. Twin-Screw compressors are an efficient design that does not add as much heat.
3) the liquid to air inter-cooler (heat-pump) has a rather large radiator that its' own little water pump uses to transfer heat energy, it appears to be able to transfer a good amount of heat
4) I'm certainly not going to use regular gas, premium ONLY!
 

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Discussion Starter · #8 ·
updated the OP with a little more content about Power

Also, just got confirmation that the kit I'm getting will be their latest revision: with supports to install the stock engine cover
(Note: I am getting black version to go with my car, but this red is their other color option)
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Awaiting estimates for fabrication/shipping time, and they are making me a "warranty document" using pictures they had me take of my car/engine/VIN placard.
 
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Yes, putting-in $5000 is alot...but if Dan is successful and Others do this too... think of all the $ all those folks would save in substantially delaying upgrading / trading-in their respective cars 'cuz they are unhappy with their engine performance. This relatively small $ could substantially extend the cars' use by these folks.
 

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Yes, putting-in $5000 is alot...but if Dan is successful and Others do this too... think of all the $ all those folks would save in substantially delaying upgrading / trading-in their respective cars 'cuz they are unhappy with their engine performance. This relatively small $ could substantially extend the cars' use by these folks.
There is no savings here. lol. It’s a money pit. Take it from a guy who would have done this 15 years ago. :) As long as you have money to blow, go for it.
 

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Discussion Starter · #15 ·
There is no savings here. lol. It’s a money pit. Take it from a guy who would have done this 15 years ago. :) As long as you have money to blow, go for it.
The savings is versus what I would spend to upgrade (figure I'd spend $15-25k on top of what I could get for my car). What's more just buying an S4 or some BMW would be sort of lame, there's nothing unique, plus way more expensive parts, and I'd just look like another as#hole ;)

It is totally worth risking ~$7k to have the possibility to have a truly unique car, a Mazda 6 that could compete with a VW GTI, Civic Type R, e46 M3, etc.
Where every time I roll up to a racing event I KNOW there is no other car there like mine
 

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Discussion Starter · #16 ·
$5000 science experiments are great as long as you have an extra car and $5k to pour into a hole. :cool: Good luck!
honestly I am thinking of this like investing in a small business, the upside in this case is an AMAZING car, but there is obviously risk in being a pioneer 💪
 
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Discussion Starter · #17 ·
Found this on youtube when I was snooping, the supercharger on a CX-5, it's short and very not English :)
and yes this is the company am working with.
 

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I'm curious how they will deal with detonation.. the high compression is not ideal for forced induction (even at low boost levels).. high compression is the enemy of boost in general . (The factory turbo 2.5 has lower compression for this reason)

Should be interesting nonetheless..

On a sidenote, superchargers usually create more torque than horsepower compared to a turbo (and it's usually very linear, i.e low end torque, would seem harder on the transmission) so I'm a little confused in the description suggesting it makes more hp with less torque than the factory turbo setup..

Keep us posted!
 

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Discussion Starter · #19 ·
I'm curious how they will deal with detonation.. the high compression is not ideal for forced induction (even at low boost levels).. high compression is the enemy of boost in general . (The factory turbo 2.5 has lower compression for this reason)

Should be interesting nonetheless..

On a sidenote, superchargers usually create more torque than horsepower compared to a turbo.. .
Keep us posted!
Yes, the compression ratio and heat reduction measures (in particular our great tri-Y headers) are why I think the attempts at an aftermarket turbo have failed.
Fortunately with a supercharger I'm not impeding exhaust flow at all (which is the biggest factor in combustion chamber temperature, and it is that heat which ultimately leads to detonation).

They claim that with the liquid-air intercooler, and low boost, detonation is not an issue (they may tune the valve timing to reduce effective CR also).
I am planning on installing an oil cooler, to aid heat management (all Skyactiv engines use the same oil filter so I will use a Moshimoto kit made for an ND Miata).

Power curve:
the way Mazda implemented the 2.5T it has 310lb/ft of torque below 2000rpm (not normal for turbos, impressive Mazda engineering). Normally turbos mean more high rpm power...

Yes, twin screw superchargers pump a set amount of air per RPM, so will give a great torque bump even at very low RPMs, but given the level of boost it's still much lower torque than the Mazda 2.5T (~260lb/ft VS. 310+).
Twin screw maintains pumping efficiency throughout rpm range, so PSI falls off a little at high rpm, but keeps PSI up enough to keep pushing horsepower all the way to red line. That's why they say 30% torque gain and 40% power gain, since the compressor helps overcome flow challenges in skyactiv at high rpm.
In contrast roots compressors fall off in efficiency in higher rpm thus are known to boost torque not so much horsepower.
 
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