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Extra torque low down for BEC's - electric supercharger!!!
Ivan - 6/6/13 at 04:32 PM

Without thinking it through fully this might be interesting - also for small engined cars. At least it seems better designed than the normal snake oil electric supercharges.

http://www.autospeed.com/cms/A_112129/article.html?popularArticle

MikeRJ - 6/6/13 at 05:24 PM

You'd need a larger battery than the average bike battery to be able to deliver that sort of current, and the generators on bike engines are often a bit marginal in terms of output anyway.

chrism - 6/6/13 at 06:26 PM

350amp power draw at full acceleration, yeah as said dont think a bike charging system is gonna cover that, Id think that even a car one would only just be enough to cover that.

[Edited on 6/6/13 by chrism]

johnH20 - 6/6/13 at 07:47 PM

The idea is not entirely daft. I went to an Imech E presentation from a guy at Ricardo recently and he was demonstrating the benefits of an electric charger on instantaneous low speed torque. The key difference is that they were using previously charged ( from braking energy ) compact capacitors to deliver the current. Not exactly DIY as it requires some clever electronics.

doobrychat - 6/6/13 at 07:51 PM

brilliant idea.. come up with a charger that kills the whole electrical system as its attempts to spin up... unless you can tow a substation...,

Dooey99 - 6/6/13 at 08:22 PM

it states it supplies a maximum of 6.6psi, thats not really worth having, 15-25psi would be worth doing but id aim to have 18 for a bike engine and 25 for a car engine

iank - 6/6/13 at 08:29 PM

It's not designed to be used as a permanent supercharger on a low compression engine, and couldn't work as such as it requires huge current. What it is designed for is a KERS like system that gives a short time kick of torque to get a heavy car accelerating quickly away with a small engine. You wouldn't want big PSI as the engine will be a high compression unit.

Ivan - 7/6/13 at 07:53 AM

quote:
Originally posted by Dooey99
it states it supplies a maximum of 6.6psi, thats not really worth having, 15-25psi would be worth doing but id aim to have 18 for a bike engine and 25 for a car engine


You would be very brave running 25 psi on any engine and 18 psi on a bike engine that is not very carefully and very expensively built to take it - and the chances are that it would be no pleasure to drive on the track and road because of lag as you need a big turbo (relative to engine size) and a highly efficient intercooler to achieve it (all of which detract from, and add weight to, the light car principal). The system I mention above is aimed at providing grunt at low revs for a short period (as someone else mentioned as a Kers type unit) to provide pull away power from a standstill with small engines and not as a full time supercharger. Hence my thought.

rdodger - 7/6/13 at 08:14 AM

quote:
Originally posted by Dooey99
it states it supplies a maximum of 6.6psi, thats not really worth having, 15-25psi would be worth doing but id aim to have 18 for a bike engine and 25 for a car engine


That's a lot!

My MX5 supercharged engine had 7psi and gave 217bhp (standard 140) think that's worth having!

matt_gsxr - 7/6/13 at 08:52 AM

Ask a few BEC drivers whether they need more low down torque.

I suspect most are pretty happy.