[Diy_efi] This turbo assist stuff, suggestions

[Grant Beaty]

Does anyone have any proof that BB bearings actually help? Quite a few Supra
people have experience with the single BB turbos from turbonetics (one BB,
one standard bearing), and they all report the exact same spool as a
standard bearing turbo.

I can't wait until people start to use the GT-series wheels. The compressors
look a little better, but I guess we can expect big gains in spool from the
hot side?

I agree, 7 psi by 2200 is too damn fast ;) I'll take more top-end, thank
you!

Grant "We need a seperate turbo list" B.

----- Original Message -----
From: "Matt Porritt" <porrittm at anet.co.nz>
To: "DIY-EFI" <diy_efi at diy-efi.org>
Sent: Tuesday, December 31, 2002 4:49 PM
Subject: Re: [Diy_efi] This turbo assist stuff, suggestions


> You my friend have
> a) got too much time
> b) smoked too many drugs in your youth
> c) are a smart cookie ;)
>
> Why not use a properly sized exh housing with a BB core and a modern
> compressor design?
>
> Modern GT turbos can spool as low as 7psi @ 2200rpm on a 2l and produce
over
> 400hp.
> Quire frankly I don't like boost that low so I'd go bigger, and nothing is
> simpler that a quick wiff of nitrous setup on pressure switches to get a
> massively oversized turbo up and away ;)
> --
> Matt Porritt
> RC Race Cars and Supplies
> ICQ #22776813
>
>
> On 31/12/02 5:36 PM Mike wrote
>
> > In reference to all this stuff about assisting the spool up of turbos,
> > presumably for fast takeoffs and gadget value, what do people think of
> > this dual approach (a=motor, b=boost):-
> >
> > a.    The "Motor" part,
> > Engineer the compressor plate to make it the rotor of a brushless
> > (induction) motor - by placing polyphase windings behind it and
> > driven by a 2 - 5 Kw motor driver, which could work as follows:-
> >
> > 1.    The compresor plate is your classic induction motor rotor
> > 2.    In 'normal' mode, the motor is off and the compressor
> > plate at idle would spin as per normal and accelerate as
> > per normal when foot placed on pedal. Eg. I observed my
> > little T3 spinning at 300 rpm when engine at idle.
> > 3.    In 'power' mode, brushless motor keeps the compressor
> > running at a higher speed in readiness for planting the
> > foot - such as a 10,000 rpm - but not for long as the comp.
> > housing will get 'warm' and the windings likewise. In this
> > mode induction motor at say 20% of rated and exhaust pumping
> > away nicely.
> > 4.    When pedal to floor (during 3 above), full power to induction
> > motor windings! So the comp is boosted as fast a possible
> > by the induction motor and exhaust gas.
> >
> > *and*
> >
> > b.    The "Boost" part,
> > Compressed air is injected tangentially to compressor plate to
> > also aid in spinning up with an extra injector to add the correct
> > amount of fuel (slightly) rich to match the air injected. Some
> > issues are:-
> >
> > 1.    Compressed air feed via PWM injector to ensure control and
> > of course to prevent over-spinning that poor turbine.
> > 2.    Motor control and Boost control would work best if integrated
> > to the same controller with feedback on turbine speed, this
> > could also datalog the operation quite effectively.
> > 3.    If there is enough power from (a) above and the compresor
> > air injection is also 'optimum' - I would expect the turbo
> > would act much like a one-way valve such that large amounts
> > of additional compressed air and fuel could be added without
> > the need for nitrous or special fuels.
> > 4.    Having a tank with compressed air would be helpful which matches
> > the 'boost spurt' people are looking for at launch, with a water
> > trap and cooling so the compressed air can be cool enough to
> > resist the detonation point - ie. It chills as it expands.
> > 5.    A cheap way to get compressed air is to use one of those
> > scuba tanks that hold 5000psi or so (need a regulator) from
> > a scuba outlet - costs $5 to refill.
> >
> > Comments ?
> >
> > rgds
> >
> > mike
> >
> >
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> >
>
>
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