eboost build questions

O

ocpilot

New member
Hello,

First off, thank you for helping others getting their projects going. There is a lot of great information here. I am planning on building a compound turbo setup (using an engine driven turbo and an electric "turbo" to reduce lag). I already ordered a oem factory turbo off an vw. I'm planning on using a vesc to control the turbo.

Any input on problems that I will run into with my project?
which VESCs would you recommend?
what about the 48V system, any recommendations on the battery/cells?

Thanks again
 
Hey there, I'm pretty new here myself. I stumbled upon Alex's YouTube channel about a week ago. I've been binge watching his videos and doing more research on the topic the last few days that I care to admit. My takeaway from what I've seen is, the power demand of the system can be massive. I'll be sizing my system off of used lithium cells (eBay) that will ultimately serve a dual purpose (powering the electric supercharger and provide multi-day capacity of off-grid power for overlanding). Personally, I will be shooting for a continuous output capacity of around 40kW. I would share what I'm getting but I need to first get them into my possession and run capacity/IR tests on them before I can recommend them.

Ultimately, the size and chemistry of your battery/cell combination depends on your system load and duty cycle. What turbo did you get? The size of it and its compressor map should give you a great idea of how to size your battery output.
 
Thanks Univisiontech1.
Yeah, I just ordered the turbo and will start having a look at what power requirements I will need. Trying to get ideas on vescs that people recommend. I'm thinking of going LTO or maybe high capacity capacitors. We'll see. Hope some people with more experience can chime in to help us both.
 
Hey no problem ocpilot,

Here's a comparison video Alex made on some ESCs.


Your power supply needs to be beefy so you don't get too much voltage sag. The lower the voltage dips, the higher the amperage pulled by the esc and motor. The amps going too high from the low voltage is what tends to burn up the ESCs. If you're looking for LTOs, https://batteryhookup.com has an ever rotating of stock that comes in, and they're a good company to work with.

From what I've found others doing, it seems like for every 15 lbs of air being moved I'd like about 10kW of power (to have safe overhead). Do you have link to the turbo you bought you can share?
 
Thanks again universiontech1. I bought one off a vw. I going to be using it to reduce lag. Will have to run some logic to have it turn on and off. I know the system runs off 48V.
 
This is the best I can find with what you've been willing to tell me

Audi SQ7 4.0 TDI - electric supercharger.

I'm very interested in Audi's electric supercharger mounted in Audi SQ7 with 4.0 TDI engine. They are quite cheap for used one and can be bought for around 600-1400 PLN ($150-$350) in Poland or about double that new one. It's produced by Valeo and it runs on 48V system, I think that part number...
www.electrifiedboost.com www.electrifiedboost.com
Good luck!
 
Thanks for the information. I have a truck with a diesel engine. Trying to reduce the lag from the large turbo.

From looking at those other posts, it looks like I'm going to run into problems with the reluctor motor in these things unless I hack the CAN communication to this unit. I have experience doing this, but I don't have access to one of these vehicles. I'll wait until I have the unit in my hand to make further decisions if I want to keep it.
 
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