Help and contact for the StromTuner app.
Contact
Questions, bug reports, or feedback — email shop@skunkriverresto.com and we’ll get back to you.
Frequently Asked Questions
Which carburetors does StromTuner cover?
StromTuner covers the Zenith-Stromberg CD needle family built around a 0.098″ jet/needle-guide bore — used across the 150CD, 175CD, 175CD-2, 175CD-2SE, and 175CD-5T carburetors fitted to Triumph, MG, Volvo, Saab, Jaguar, Land Rover, and Jensen-Healey models, among others. Unlike SU, this needle family doesn’t have separate jet-size or fixed/biased-needle variants to choose between — every needle in the database is directly comparable.
How does Tune work?
Pick a needle you already have as your reference, choose a region of the needle (Idle, Low Cruise, Mid Cruise/Low Accel, Hi Cruise, Hi Accel, or the whole needle), and choose Richer or Leaner. StromTuner searches every needle in the database for ones that are consistently richer or leaner than your reference in that region — without going the wrong way anywhere else in it — and ranks them by how little they change everywhere else on the needle.
What’s the difference between the diameter chart and the flow area chart?
Diameter is the raw measurement. Flow area is the actual open gap between the needle and the jet at that station — it’s what fuel flow is really proportional to, not diameter directly. Richer and Leaner are labeled consistently on both charts even though the two values move in opposite directions as the needle tapers.
How do I import a dyno log?
On any needle’s detail screen, tap Import AFR Log and choose a CSV file with an AFR (or lambda) column and a vacuum column (inHg, MAP in kPa, or PSI) — RPM is optional. StromTuner places each reading by its vacuum value, since needle position tracks airflow/vacuum rather than engine speed, and plots it against the needle’s own station chart. You can keep multiple named runs at once — log after every session — show or hide each on the chart, and set a target AFR band per zone to see at a glance which region is running rich or lean.
Where does the vehicle-application data come from?
Each factory application in the Applications tab is cross-checked against original parts catalogs, factory service manuals, and established marque specialists wherever possible. A handful of applications rest on a single source rather than independent corroboration — those are marked accordingly in the app so you know to double-check before ordering a needle based on them.
Does the app work offline?
Yes. StromTuner makes no network requests of any kind — the needle database, vehicle applications, and any AFR logs you import are all stored on your device.