Find, tune, and compare Zenith-Stromberg CD carburetor needles — on your phone, not in an old parts-catalog spreadsheet.
StromTuner is SUTuner’s sibling for Zenith-Stromberg CD carburetors — the same needle-matching approach, built for the 1½″ CD/CDS/CDSE needle family (144 real needles, all sharing one 0.098″ jet/needle-guide bore). Enter the diameters you want at any station and it ranks the closest-matching needles, or start from a reference needle and tell it to search a specific region richer or leaner — it finds the needle that gets you there with the smallest change everywhere else.
Every needle’s profile is charted two ways — raw diameter and actual flow area — and you can overlay up to four needles at once, normalized at idle so the shapes are directly comparable. A built-in reference of 39 factory vehicle applications (Triumph, MG, Volvo, Saab, Jaguar, Land Rover, Jensen-Healey) links straight to real needle data, and if you’re tuning on a dyno, StromTuner can import your logged AFR — multiple named runs, kept per needle — and plot it against the needle’s own station chart, with editable target AFR bands per zone, so you can see exactly which region is running rich or lean.
Features
- Search by desired diameter at any of 13 stations, sorted by total deviation or least-squares fit
- Tune a specific region — Idle, Low Cruise, Mid Cruise/Low Accel, Hi Cruise, Hi Accel, or the whole needle — richer or leaner from a reference needle, ranked by smallest disruption elsewhere
- Compare up to 4 needles at once: diameter and flow-area charts, normalized-at-idle or raw
- 144 Zenith-Stromberg CD needles, one 0.098″ jet/needle-guide bore family covering the 150CD/175CD/175CDS/175CDSE range
- 39 factory vehicle applications across seven marques, cross-checked against parts catalogs, factory manuals, and marque specialists
- Import a dyno AFR log (CSV) — keep multiple named runs per needle, with editable target AFR bands per zone
- Works fully offline — no accounts, no ads, no tracking, no network access at all
