Quote:
Originally Posted by neutron256
al3k, since your only looking at this as an anti lag system have you considered using ultra capacitors rather than batteries to power it? Since you’re only going to be using it for a fraction of a second while the conventional turbo spoils up you wouldn’t need much battery capacity, and ultracapacitors provide virtually unlimited current and recharge much faster and have a longer charge/discharge cycle life.
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Thats a very good point! I will need to look into that for sure.
I also just discovered that since I have the ESC in series after the main turbo and all the air that the ESC gets on inlet is taken from the main turbos outlet (after the FMIC), so this is actually a twincharge system so there will be a compound effect happening.
This will reduce the boost requirement for ESC, since the total boost is Pr X Pr (Pressure ratio).
Wikipidia Twincharging series:
"series configurations exist where no bypass system is employed and both compressors are in continuous duty. As a result, compounded boost is always produced as the pressure ratios of the two compressors are multiplied, not added. In other words, if a turbocharger which produced 10 psi (0.7 bar) (pressure ratio = 1.7) alone blew into a supercharger which also produced 10 psi alone, the resultant manifold pressure would be 27 psi (1.9 bar) (PR=2.8) rather than 20 psi (1.4 bar) (PR=2.3). This form of series twincharging allows for the production of boost pressures that would otherwise be unachievable with other compressor arrangements and would be inefficient."
This is with my current setup (turbo only), 2nd gear pull:
2000rpm 1psi
2500rpm 4psi
3000rpm 8.5psi
3500rpm 16.6psi
So if I make for example constant 5psi on the ESC result would be:
2000rpm 6psi
2500rpm 10psi
3000rpm 16psi
3500rpm 26.5psi
I also found a chart with precalculated final boost numbers for twincharge series setup: