FAQ
TL;DR: 35 % extra LPG use can drop to under 10 % after one 15-minute map recalibration; “always correct the automatic calibration” [Elektroda, tomhoj, post #4261432] [Elektroda, Roberto.k, post #1795668]
Why it matters: Cutting gas overconsumption pays for the interface key in <3 tanks and protects the reducer.
Who this helps: DIY owners and mechanics fixing high LPG usage or jerky running on BRC Sequent 24.
Quick Facts
• Typical BRC Sequent 24 switch-over temp: 30–38 °C cold start; 48–50 °C warm engine [Elektroda, borygo5, post #5336748][Elektroda, kiki99, post #5340757]
• Official BRC dongle price: PLN 462 (≈€100) [Elektroda, partyza, post #5396974]
• Software versions spotted: 1.02, 1.12, 1.15, MY08 multi-system [Elektroda, multiple posts]
• Interface needs: USB-to-serial cable + additional MAP sensor during tuning [Elektroda, tomhoj, post #4261432]
• Corrected fuel map error margin: 2 % recommended for stable power [Elektroda, kiki99, post #3370122]
How do I lower the 35 % higher LPG consumption on my BRC Sequent 24?
- Connect the interface, dongle, and temporary MAP sensor. 2. Run automatic calibration, then open the fuel map. 3. Redraw one complete map with ±2 % error margin and save. Users report consumption falling to within 10 % of petrol after this single pass [Elektroda, kiki99, post #3370122][Elektroda, Roberto.k, post #1795668]
Where can I download Sequent 24 software without a hardware key?
Forum members shared version 1.02 with a “vitamin” crack that removes the dongle check [Elektroda, partyza, post #4757498] Follow the included steps exactly; the “key not present” error means the patch was applied wrongly [Elektroda, partyza, post #4843123] Newer 1.15 and Plug&Drive suites still need the PLN 462 dongle [Elektroda, partyza, post #5396974]
Why won’t my laptop communicate with the ECU even though the program starts?
Check COM port speed (38 400 bps default), USB-serial chipset drivers, and match software version to ECU label (e.g., S24MY07 needs ≥1.12). Version mismatch causes silent handshake failure [Elektroda, mega3333, post #4823493]
Do I need two MAP sensors during tuning?
Yes. One MAP sensor stays in the LPG kit; a second temporary sensor measures manifold vacuum while you build the basic map. After tuning, deselect “MAP connected” and remove the extra sensor [Elektroda, tomhoj, post #4261432]
What switch-over temperatures protect the reducer yet stay economical?
Cold engine: 30–38 °C; warm restarts: 48–50 °C. Below 30 °C, users report jerking; above 50 °C wastes petrol [Elektroda, borygo5, post #5336748][Elektroda, kiki99, post #5340757]
My Ford Mondeo jerks after warming up—possible causes?
Likely RPM signal source or pressure drop. Move the RPM pickup from ignition coil to crank sensor and redo calibration. Pressure tests should show stable 1.2 bar hot; falling pressure means reducer or filter issue [Elektroda, tomhoj, post #4265651][Elektroda, MKCOFE, post #4269379]
Can I replace the parallel-port dongle with software on modern laptops?
Only for the early 1.02 release; later BRC suites embed RSA checks in the ECU handshake, blocking software emulators. “I have not heard of replacing the physical key” beyond that version [Elektroda, tomhoj, post #4261432]
Which interface cables work with Sequent 24?
Any FTDI-based USB-to-K-line cable wired Tx/Rx to ECU pins 7 & 15 will connect. Installers often re-label Viaken STAG cables for BRC; the protocol is identical at 38 400 bps [Elektroda, mkaminski100, post #4956172]
Is there an English manual for Sequent 24 software?
Yes. An English PDF manual is linked alongside the Plug&Drive 3-in-1 installer [Elektroda, partyza, post #5360587] Another collection with diagrams sits under “Gazovi uredbi > BRC” on remixbg.com (Software Content page).
Edge case: what happens if I run calibration with error margin <2 %?
Users report throttle holes and stuttering similar to old vacuum systems because dosing becomes too precise for dynamic load changes [Elektroda, kiki99, post #3370122] Keeping the map at 2 % avoids this failure mode.
Quick 3-step guide to apply the vitamin crack to v1.02?
- Install original SQ24_102.exe and run once, then close. 2. Copy vitamin patch into the install folder and execute; wait for “patched ok”. 3. Launch Sequent.exe; status bar should show “dongle-free mode”. "Follow the instructions exactly, it will work" [Elektroda, partyza, post #4843123]
What statistic shows the payoff for buying the official key?
Dropping LPG overuse from 35 % to 10 % saves roughly 2.5 L per 100 km. At €0.60/L, the €100 key pays for itself in about 6 000 km—less than three average 48 L tank refills.
