Electromagneticly clutched supercharger with natural aspiration bypass.

[Morten T Nielsen]

Hi Tim

I would suggest reading these books:

1. "Understanding Automotive Electronics" by William B Ribbens (Fifth Edition)
2. "Automotive electrics and electronics" (Third Edition)

I've just read both of them and they gave a good baseline knowledge of how modern EFI's operate. I'm not english or american and haven't read many "tech" books but still they were both fairly easy readable and understandable.
I borrowed both of them at our capital library...that's a bit cheaper than buying then and if there is something you would like to keep you can always make a copy af the page.

Good luck with the projekt!

Morten T Nielsen


----- Original Message ----- 
From: "Julia Wakeling" <tjtbw502 at home.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, August 23, 2001 8:39 AM
Subject: Electromagneticly clutched supercharger with natural aspiration bypass.


> Hi there everyone.
> 
> I'm Tim Wakeling from Unleaded Racing Technologies, and this is officially
> my first experience building a "DIY-EFI" system of any kind.  For the past 7
> months, I've been testing a 1993 Honda Del Sol with a single overhead cam
> (1.5 L) non-VTEC.  The goal is to achieve 50 mpg highway, 12.99 1/4 mile
> times, 1.0 G's on a lateral skid pad, in a daily driven LEV (low emission
> vehicle) del Sol.
> 
> To do this, I decided to fabricate an electromagneticly clutched, roots
> style supercharger, intercooled, with a natural aspiration bypass actuator
> motor.  The idea is to switch over from N/A, to boost with the single flip
> of a switch.  By making the activation manual ONLY, you could still drive
> the car to full potential without activating the supercharger, and activate
> the supercharger at partial to no throttle whenever you choose to
> "discourage" potential competition while stopped at a light.  Whether for
> effect, (sounds like a vacuum of steroids) or for performance gains, the
> system till now has worked exceptionally well.  Basically, power ONLY when
> it's chosen.  The fuel system has actually done quite well for itself.
> Running an adjustable fuel pressure regulator, the OEM fuel computer has
> been able to calibrate fuel mix on it's own, and still stay rich enough to
> not cause much of a problem at all.  I was amazed.  At 7psi, she's been
> doing everything on her own.  The MAP sensor is capable of reading positive
> psi, but the control module won't recognize it as a legitimate value.  As
> soon as positive pressure is discovered, she tosses a check engine light,
> goes into open loop mode, and the mix is perfect (according to the digital
> lean/rich gauge).  Once I found this, I decided to hold off on fuel system
> upgrades until I found out whether the system was going to be reliable
> enough for daily use, and be able to keep itself attached to the front of
> the block.  So far it has.  The car gets a whopping 53 miles per gallon
> AVERAGE (mainly through lightening and rolling resistance), both city and
> highway, and runs a stout 15.30 1/4 mile (17.65 on N/A).  Not bad for a
> stock 105 horse engine with no work at all to the fuel system, and 147,000
> miles without even a simple rebuild.  On to step 2.
> 
> Now comes the hard part.  12.99.  And holding it together.
> 
> I've decided to go ahead and swap over to a Japanese spec 1.8 L DOHC VTEC
> Integra GSR powerplant.  Starting at 185 horse, it will be far easier on
> driveline parts to get the performance I'm looking for.  Less broken pieces,
> better streetablitiy, and a platform that has a lot more in the way of
> aftermarket upper and lower end pieces available.  But, how am I still going
> to get 50 miles a gallon with an engine that gets 35 mpg on it's best day?
> And even better.  Where do I start on fuel maps?
> 
> This is what I think the system is basically going to require:
> 1 map for N/A without VTEC
> 1 map for boost without VTEC
> 1 map for N/A with VTEC
> 1 map for boost with VTEC
> 
> Where do I start?  I'm a diagnostic technician, with little to no experience
> in designing fuel injection systems.  Yes, I can build one HELL of a short
> block, but when it comes to making a system that currently doesn't exist, it
> kind of makes a diagnostic technician a little bit unqualified.  I've spent
> 3 years at  a Mercedes-Benz dealer diagnosing and repairing electrical and
> fuel systems, and the last 7 months at a new Honda store doing the same.  If
> it's broken, I can fix it.  But I've never tried to "make it" on my own.
> I'm doing the little project for really nothing more than personal
> satisfaction.  I want to see if I can in fact do this myself.  But having no
> experience in this field, other than repair and diagnosis, I've got homework
> to do.
> 
> What is everyone's suggestion on my next step?  What do I need to read?
> What do I need to brush up on?  How much of the diagnostic knowledge that I
> have is actually going to help me, and how much is it going to hurt me?
> 
> Anything that this forum can assist me in is one step closer to where I'd
> like to get.  Don't be afraid to talk over my level.  If I don't know what
> you're saying, I'll know what I need to learn.  I'm looking for direction,
> and figured where better to start than the do it yourself electronic fuel
> injection forum?
> 
> Thanks for your time!
> 
> Tim Wakeling
> Unleaded Racing Technologies
> 
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