SV: Turbo Imp - Surge tank advice?

[espen hilde]

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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