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An intermediate price point possibility is an APD Pro 16S rated for 400 amps (180 seconds) and 600A burst. These are selling for $699 on Ebay. Also NeuMotor makes various 10 kW continuous, 20 kW peaks motors. For example the 3020 which is available in KVs from 165 to 700. Their website does...

What I have been noodling on for a 16S2P LiFePO4 40 amp hour battery pack is: 16s balancing board - ~$75 110V AC charger (10A DC) - ~$100 1000W 12V to 110V inverter - ~$75

I also think that the jury is still out on whether the Max 4 ESC is really capable of 300 A continuous. Admittedly in the test Alex did at a little over 300A (for 14 seconds) the fan was not running but the ESC temperature was increasing at 2 'F per second. Really need to see if the...

I can't find anything on the HW site that mentions a kW rating. Their sizing information seems to be "good for 1/4 to 1/5 scale cars". What they do give is: 560 KV 70 mm diameter by 125 mm long 2 kg weight 8 mm shaft By comparison a Neumotor 3030 which is rated for 15 kW continuous and 30 kW...

Does you P2 have helical gears that step up about 3.6:1 similar to a Vortech V2? I have seen some info that says that they can come with the step up gear and other info that says direct drive

Give me some more specifics on your target engine and I can give you a better estimate of minimum engine rpm to stay out of surge. To keep things simple, just leaving the supercharger off until engine rpms are high enough to avoid surge may be the way to go initially. Adding a BOV with...

The Vortech Si trim supercharger has a very flat curve at 27,000 rpm. The pressure ratio at 360 cfm is 1.35 (5 psi of boost). The pressure ratio is actually a tad lower at the surge point of ~220 cfm. I wouldn't think that detonation would be a problem at low engine rpm. Given the flat...

If you are looking at the PCE-P2 supercharger and if it similar to a Vortech with Si trim, it is a large unit for a 3.0L engine. The Vorteech Si can support a big V-8. Assuming a 3.0L engine is at 6000 rpm with 90% volumetric efficiency (4-valve head), the supercharger would need to flow about...

Herb, the friend I mentioned has a warehouse full of old machines from the 1940's to 1950's era. Better stocked on mills than lathes. His health is starting to decline and I know he would like to sell some of his inventory. The warehouse is located in Kenedy, Tx. Call me at 361-215-4470 to...

Please see the thread entitled charge air cooling with freon. The second heat exchanger you mention does not directly cool the charge air with freon. It cools a non-freezing coolant (likely water/glycol mixture). This chilled liquid is then pumped to an liquid-air intercooler heat exchnager...

My target car is a 2.8L V-6 that doesn't have great volumetric efficiency at high rpm. With 10 psi of boost and 60 'F intake temperature it will flow a maximum 1400 lbs/hr of air. If the supercharger outlet is 200 'F then the delta T for the intercooler is 140 'F. The heat capacity of air is...

Both density and knock. I said 50 'F approach temperature because I got that number from a website. The approach temperature depends on the size of the heat exchanger (surface area) and the heat transfer coefficients (dependent on several things). But a fact is that as the approach...

I brought this topic up in another thread but to avoid getting the other thread more off topic, I'm starting a new thread. Air-to-air and air-to-liquid intercooloers have been used for many years on superchargers and turbos. These make a lot of sense when running lots of boost. However in...

Where I live the ambient day time temperature is greater than 90 'F six months of the year. An air-to-air intercooler can never cool the intake air to less than ambient. The difference between the intercooler outlet temperature and ambient is called the approach temperature. The surface area...

The efficiency on a supercharger is not a fixed value. It depends on where the operating point falls on the compressor map. If you take a big supercharger and run it at low speed the isentropic efficiency suffers. A Rotrex C15-60 at 10 psi of boost has an efficiency of 60% at the surge line...

I worry about coupling a 50,000 rpm motor to anything except through a belt as Alex has done. A little bit of misalignment and there go the bearings - maybe not right away but over time.

Hytek, if you can provide a compressor map that has efficiency on it, I can tell you the temperature rise at various pressure ratios. For example at 10 psi (about 1.69 pressure ratio), the temperature rise from ambient is as follows vs supercharger efficiency: 55% - 150 'F 60% - 137 'F 65% -...

After watching one of Alex's videos and how easily the supercharger could accelerate something didn't smell right. I based the previous calculations on the impeller speed. But on the Rotrex unit some of the rotating mass is spinning at less than impeller speed. So I contacted Rotrex and asked...

You need to look at the C rating on batteries. The C rating is a factor times the amp-hours of the battery that tells the maximum discharge or charge rate. A123 LiFePO4's have a discharge C factor of 10 to 15. LTO batteries are typically at least 10C discharge. Typical LiPo are 1C. So with...

I don't think anyone here has tried a NeuMotor (neumotor.com) but they seem to have a good reputation in the RC world. Their model 3020 is rated at 10kW continuous and 20kW peak. Their 3030 is rated for 15kW continuous and 30 kW peak. There are various options for Kv depending on how the...