SV: Turbo Imp - Surge tank advice?

[Dave Edge]

My idea is to have a bulb in the gravity feed line at
the front, leading down to the pump. This should
eliminate any surge, unless the corner goes on long
enough to use all the fuel in the bulb.

Surge tank would be best though I think, especially as
the fiesta fuel pump has a large flange on the top
with two pipes coming from it - one for fuel out under
pressure, the other for low pressure return.

Ideally the surge tank will have a float on the top to
shut a valve preventing further ingress of petrol.
Maybe this is overkill but I like the sound of it.

looking forward to eating BMWs for lunch :-)

Dave

--- espen hilde <mwichstr at online.no> wrote: > Hi!
> We have allmost the same car! I have a 69 NSU 1000TT
> with 1850cc VW 
> (NSU)K70 engine with a T3 size turbo and dellorto
> turbo carb.
> I build this car in mid 80 s  I would love to change
> to efi to get better 
> milage and power.The most important thing is to have
> the right ignition 
> timing curve,thats  difficoult with the mecanical
> system .If I was going to 
> do it I would use 332 efi or
> Autronics ecu,Turbo chargeing have different demands
> on the ecu /software 
> than a nat and not every ecu is prepared even if
> they say it will work.Peek 
> and hold injectors,or stagered saturated,sequential
> to use less fuel when 
> the boost pressure is higher than exhaust
> bacpressure,sequential for one 
> long injecting period is easier to controll with
> presition than 2 
> short,(idle)less ignition advance under hard
> accleration because a spooling 
> up turbine is creating a higher backpressure=higher
> temp combustion ,more 
> prone to detonations. What controls the airflow trou
> the engine is the 
> efficiency of the turbo and the steeply rising
> backpressure at high rpms 
> ,what you are doing is to map the ecu against the
> backpressure with the 
> inlet pressure as a assumtion of what the
> backpressure is....
>  I dont know what your ecu s features and
> capabilitys are and your hp aim 
> could maybe be reached with not that high pressure.
> I cut my fuel tank to make room for the battery in
> front of the car, I just 
> welded a hose outlet in the buttom for the K-jet
> fuel fuelpump
> that sits under the car.......dam your right
> ,(thinking while I write.....) 
> I have not experianced any fuel starvation in the
> corners but maybe thats 
> just because I have the carb bowl as a reservoir....
> be prepared for some fun with your little car ! My
> eats BMWs and Porches 
> for lunch and AC Cobras for dinner
> Thanks
> Espen
> Dave Edge [SMTP:edgedj at yahoo.com] skrev 15. mai 2001
> 11:17:
> > Hi All,
> >
> > Just a quick note to all out there by way of
> > introduction. I own a 1969 Sunbeam Stiletto
> (Hillman
> > Imp by any other name) which has a 930 na engine
> > fitted. The aim of the project is to produce a
> > reliable 130bhp, more importantly I want 80lbs+ of
> > torque. To do this I need to install a Renault 5
> > Garrett T2 turbo and of course to do that, I need
> EFI.
> > I have all the bits for the turbo from ss manifold
> to
> > intercooler. I bought an aftermarket ECU from
> > www.perfectpower.com and then my difficulties
> started.
> > It's supposed to be a basic system repsonding to
> > engine temp, MAP, throttle, electronic points,
> single
> > coil firing, control of two banks of injectors.
> The
> > ECU itself suffers from interference and refuses
> to
> > fire consistently, flames have been spotted out
> the
> > back when running. Basically the only reason the
> > engine runs at all is that the coil fires
> virtually
> > all the time and the rotor arm points the spark to
> > ROUGHLY the right plug. Same result in my
> girlfriend's
> > Nissan Micra so the ECU has gone back to SA for
> > replacement(which they are very happy to do -
> phew).
> >
> > In the meantime, my main problem is that of fuel
> > supply. I have a 60psi fuel pump from a Ford
> Fiesta
> > XR2i, any ideas on surge tank location(are they
> even
> > necessary) given my front petrol tank / rear
> engine
> > setup.
> >
> > a) Surge tank high in the wing above the engine
> and
> > use the old mechanical pump to fill it.
> Be careful that the old pump can deliver enough fuel
> for the engine.
> best I think.
> > b) Surge tank below existing fuel tank gravity fed
> and
> > pressurise the line along the car
> >
> > c) just fit the thing in my fuel tank and wait for
> > surge round corners.
> >
> > Cheers
> > Dave
> >
> >
>
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