This is going to be a bit long winded.
Ok let me the first to admit I got a bit caught up the the power race and over looked my goal and requirements and the most important aspect of my project car build. Nope it not the E-Changer but the High-End Sound Quality audio system to represent my speaker company. So tons of power was never the goal for this project. However it is a show car secondly and power adds are a part of the show car judging in this organization.
So with the above in mind I had step back and weigh my goal for the E-Charge part of the project and yep Ok I am etching to my build started as I don’t have a ton of time left to get it done before the competition season ends. So that puts me in position I need to purchase products that are a bit more really available to me.
So my realistic goals for the power adds/performance mods to My 2011 Cadillac CTS Coupe Performance 3.6L LLT Direct Injected build.
Performance mods already performed:
Custom (my own design): 3.5” cold air intake
Overkill 76mm ported Throttle Body
Ported to 78mm composite intake manifold with JabFab Lamintor FX molded in: This unit weighs about 8-9lbs less the stock aluminum unit and lower the heat soak by a good amount and increase Air flow my about 20%.
RX Insolator: This unit lower the intake manifold temperature up 40 degrees.
Custom (my own design): Cat back exhaust.
Plans:
Snow Performance (have, but not installed): water/methdol stage 3 injections kit.
Custom: Smart E-Charger system
So now my thoughts and question on my E-Charger setup:
First and foremost parts are to be readly available.
Next power goals are 325-350whp. Car stock dynos at 245-260 depending dyno used
Not spend more than 4K building it.
So the P2 super charger unit seems to be a given do to its efficiency and low rpm requirements to get to the level of boost I and/or we desire. Going back over the numbers mention here and looking at the calculation 23-26000 rpm will be need to get about 4-5 psi of boost. Considering I looked over the net at the LLT and LFX 3.6L engines on boost from a turbo setup (so no lost from the extra engine having to drive the super charger) running 6 psi of boost was seeing 140-180 extra HP at the crank depending on what other mods had done and the tune. So with E-Changer being more like the turbo with no power lost from engine having to drive the unit 4-5 psi of boost should put me right where I want to be of 325-350 to the wheels
Thoughts and comments. Please correct me if am wrong.
Now to the driving force of the system the motor choice. Looking at impeller speed requirements for 4-5 psi of boost, any of the below mention motors should be able to meet the required 23k to high 28k(6 psi) rpm speed with easy. Now the require power comes into play with the amount if current draw and operating voltage range of said motor.
Now,
The LMT30100 continuously does 17KW with a peak/max of 40KW with voltage range of 60-120(?) is without a question the best choice, see specs here for those who have not seen them:
17kW Electric Propulsion System is combination of high-performance brushless DC motor controller and low weight electric motor.
www.mgm-compro.com
however the LMT3080 does 14KW if remember correctly continuously with peak/max of 30KW so it would work just as well. Even the LMT3060 at peak/max of 17KW might work for my setup. However none of the LMT product are readily available here in the U.S. Which bring me back to the TP5860 and TP5870 at max 15KW.
So lets look at the numbers:
So theoretical at 5 psi of boost at 3000 - 6000 rpm I will need the motor to make about 13.5 shaft HP which is about 10.1KW at 6000rpm. So at the 48Volts I want to use, that is what about 211 amps of draw. If I go up in Voltage current draw would drop, later on that. Looking at those numbers if I am correct even the TP units should be comfortable in that range well the TP5870 (750KV) anyways.
Please correct me if my math is wrong. I did round up the numbers.
So it looks like the TP-5870 (750KV) would work for MY requirements.
TP-5870 (750kv) specs:
53 max voltage
Max 283 amps
40000 max rpm
9000 kw continuous power
15000 kw peak/max power
So with those specs in mind that is about 755rpm per volt. So at 48 volts, max rpm should be around 36,200. So 23-28000 rpm should still be easy running for the 5870. Also the 10.1KW of power require for my 5psi at 6000rpm should be within its range also. Yep that 17KW (40 max) or even the 14KW (30 max) of continuously power the LMT30100 and 3080 is crazy appealing and at some point I may upgrade to one of those units.
Once more please correct my math if I am wrong.
Now it is ESC time. Going with one of APD ESC. Honestly any of them should work. Even the NV-Pro 24s 200 amp Continuously and 300 amp max should be within the range but at the limits?
Thoughts?
Which I hate it would be at of close to it limits as I found a good deal on the 24s. So the 20s still seems like the best choice at 85V and 300 amp continuously and 450 peak.
Now What need input on is a battery pack setup. I would like to stay around 48V range.
Now with that said one of the techs at my job I was talking to about the project said he had a few (6) EV car Lithium-Ion packs he would sell me for cheap and thought they would work.
Specs are:
16s1p
60V
6500mAH
390WH
What do you guys think of these units? And how many would I need if they work? I was looking to use the Sterling Power smart charger 12 to 48 step up unit. But if the above units will work I will find another charger. And with 60V rating it would allow for less draw at 5psi at 6000rpm. Drops from 211 amps to 170 amps. Which puts me within the 80-85% range of the 24s 200amp continuously rating and about 60-65% of 300 max rating. Now at 60 volts that out side of the 53 volt rating of the TP5870.
Which shouldn't be an issue or would it be?
Sorry this was so long winded just trying to wrap my head around it all and start moving forward with the build.
Thanks in advance for all your input!!
And Go!!
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