Frequently Asked Questions
Which carburettors are supported?
WinSU currently supports the following carb sizes in single, twin, triple, and
1.25" HS2 (0.09" jet)
1.5" HS4/HIF38 (0.09" jet) also suitable for HIF4
1.75" HS6/HIF44 (0.1" jet) also suitable for HIF6 and HD6
HS8 (0.125" jet) also suitable for HD8
Which engines are supported?
WinSU currently supports the following engine types in standard and modified
series : Mini/Metro/Midget/Minor, all common capacities 850cc-1430cc
series : MGB/Marina, 1800cc plus standard overbore capacities
series : MGC/Healey/Princess, 2639/2912cc
series : Maxi/Allegro/Marina/Princess, 1485cc/1748cc 4-cyl, 2227cc/2622cc 6-cyl
series : Metro/Rover200/MGF,1120cc/1396cc/1588cc/1795cc
series : Princess/Marina/Maestro/Montego, 1700cc/2000cc
MG-T : TA/TB/TC/TD/TF/TF1500, 1292cc/1250cc/1466cc
Rover V8 : Range Rover/TR8/SD1, 3528cc/3948cc/4278cc/4554cc
cyl : XJ6 etc, 4.2L
: E-type, XJS, XJ12 etc, 5.3/6.0L
cyl : Spitfire Mk1/2/3/4/1500, TR2/3/4/7,
cyl : TR5/6, 2498cc
: Stag, 2997cc
general purpose engine type for any other car which calculates the best needle
based on estimated power, 500cc-6L, for standard and modified spec
What operating systems will it work under?
Microsoft Windows 98/2K/ME/NT4/XP/Vista/Win7
This software was written using VB.NET and requires the
Microsoft .NET framework v1.1
This software will not run under windows 3.1 or 95.
It is not
yet available for Linux, Unix, or Mac.
What PC spec do I need?
Recommended PC spec : Windows XP, Pentium IV 2GHz,
1GB ram, 1024x768, 16M
Minimum PC spec : Windows 98, Pentium II 400MHz, 128MB ram, 800x600, 16M colours
Hard disk requirements : Approx. 20MB
already a registered user! Am I entitled to a free upgrade?
Yes! Registered users of older versions of WinSU are entitled to a free upgrade
to the latest version.
Users of WinSU v1.x.x : Please install the latest version and email me at
winsu . co . uk
a free activation code. Please supply the registration code displayed in your new WinSU, along with your name and address so that I can look you up in my list of
Users of WinSU v2.x.x : If you already have version 2 of WinSU please check
for free upgrades. Registered users can simply upgrade. Your licence key will
continue to work.
I've upgraded my PC / My PC has crashed - Can I have a new
Please fill in
this form to request a new activation code.
Will WinSU run on European Windows (eg: Netherlands/France)?
Yes, WinSU v2.1 onwards will work on European versions of Windows (eg: countries
which use a comma for the decimal point).
Where can I buy SU carburettor needles?
Recommended needle suppliers...
The SU Carburettor Company :
What engine data do I need to enter into the software?
As a bare minimum you need to select the engine type, capacity, and size/number
of carbs. You can then get a more accurate needle estimate by entering things
like air filter type, cam choice, exhaust system, etc.
do I connect it up to my engine?
WinSU does not physically connect to the engine. It isn't like modern
diagnostics equipment for engine management. It simply runs on your PC and
suggests needle codes based on your engine spec*. You will then need to purchase
the needle(s) and fit them into your carburettor.
is it only showing spring type needles?
What you need to do is go into Tools->Options and untick "Only suggest popular
needle codes". This option makes WinSU only show the spring loaded needles which
tend to be popular nowadays in the later SU carbs (eg: HIF38/44).
Will it suggest needles for turbocharged engines?
WinSU does not currently have the facility for turbochargers in the engine spec
pages. This is something I hope to add in the future. You should still be able
to work out roughly what needle to use though.
Does WinSU suggest the dashpot spring as well as the needle?
v2.5 onwards will suggest the dashpot spring for your engine specification.
the suggested needles chosen for maximum power or maximum economy?
WinSU will aim to suggest 'factory' needles which give a good balance of power
and economy. For racing applications where power is more important then you
should aim a little richer, and likewise, aim a little leaner for more economy.
To find needles which are slightly richer or leaner you will need to use the
'Find similar needles' feature*.
Registered users only)