Jetski superchargers

[nÖqµd]

Dear Boosters,

i've been browsing the Forum looking at your marvelous results and intriguing experiments. Since i'm very much less than a beginner at designing and building an electric supercharger from scratch making use of a P2 and its necessary accessories, i thought of maybe trying to apply a jetski supercharger - like a readily and cheaply available sea-doo model. There could be a big advantage as no need arises how to source / machine the axle, as it comes complete, at possibly even lower prices (on ali) than a bare P2.

i was wondering if those are not feasible at first glimpse to you at all, since i found no entry investigating their potential in any threads (apologies if they were discussions i missed).

The factory models are restricted to ~8500RPM, which might not pair in an optimal way with the Holy Grail HW 70125 560KV, as its lowest RPM at 8s is twice as much. Although with aftermarket billet impellers (a Rotax for instance) the RPM limit might be lifted.

Could anyone please advise?
Thank you!

 

[Just4Boost]

Pendulum Tuning in Australia was developing one using the Jetski blower with the overkill
LMT 3080.

Pendulum Tuning

Pendulum Tuning are specialists in the mobile tuning of engine management computers.

youtube.com

Also DIY VIDEO channel shows a basic one using a 2kw brushless Vevor Scooter motor.

I know they make these superchargers suitable for upto 300hp. At a guess 5-6kw would probably be required to spin this for sufficient CFM for 300hp.
Rocket Surpass have a few cheap motors.
6S 5692 rated around 5.2kw - can run off 24v (12x 12V SLA) on a budget.
or
8S - 10S / 56112 rated at 7.3kw

A hobbywing Max 6 G2 8S with Bluetooth would be a perfect match for these motors.

As I don't think the Seedoo blower will draw the full 195A on the 8S motor.

Best of luck.

 

[AlexLTDLX]

If the compressors are sized right for the motor and you're not wanting more than about 6-7 psi of boost to hit 300 hp, 5-6kW is pretty much right on the money.

 

[nÖqµd]

Thank you for the input!

im planning the project for my 1.6 diesel which is tuned up to about 180HP right now - might add just a couple more to that when i finally manage to install the snow WMI i have for it waiting in the corner (have to yet design a frame for the direct port and have it milled out).

Not looking for huge gains really as it is a daily use car, more like a little boost for earlier acceleration at (always) lower RPMs (and those also only in gears 3-5 for a max 2-3sec, and in gear 6 only when the pedal is completely pushed down, but i don't want to get ahead of myself), similarly to brettus8's own setup.

As the supercharger would only run for short bursts and low boost, i wish it to be self-sustained by the alternator. For that purpose i acquired a 350A max output enhanced part (12-16V adjustable by external voltage regulator).
Have 42 pieces of 22Ah / 2.3V LTO cells already, but might just add a few more cells… but here comes the part where Knowledge is greatly needed, because i would need to decide upon what voltage the secondary battery to operate at. Which is difficult, since i not want to use the battery pack merely for powering the supercharger only, but also to route the head unit and speakers to it (so i can update the software / listen to music without having to idle the engine). So basically it should be able to provide ~12V, while powering the supercharger too.

i believe, ideally, the cells should be arranged to match the voltage range of the motor/s that drive the supercharger, but also inserting boost converters and maybe an additional buck converter to the setup to serve all the desired appliances at once seem unfeasible.
Simplest would be to find motors that could be useful near 12V - LTO 6s is still slightly below 14V, but 7s would be already too much for the appliances and especially the alternator to charge too.
Since low voltage motors tend to be low power, maybe i could use multiple ones to add up the necessary power?

Thank you for your precious insights!