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Honda Civic VIII 1.8 (2009) LPG Installation: Stag Qbox Plus, ACR01, ACW02 & VTEC Usage

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Can a 2009 Honda Civic VIII 1.8 be safely converted to LPG, and should I use petrol assist, a wideband sensor, and VTEC on gas?

Yes, the Civic 1.8 can run on LPG, but Honda engines need a careful, well-tuned installation and are less forgiving than simpler engines [#18113404][#18137029] Extra petrol injection is considered worthwhile because it can help, especially at higher RPM, but it is not a guarantee against valve-seat issues [#18113404] The car seems to use a 4-wire sensor rather than a standard wideband probe [#18113404] VTEC can be used, but the advice is to remember that LPG is mainly for savings, so it is worth adding petrol at high revs [#18113404] The LPG controller settings, including the injection-time/multiplier graph, can be saved and later loaded from a USB flash drive [#18113404] The offered reducer was described as only average, and the injectors were suggested to be swapped for Hercules with proper assembly and tuning [#18113404]
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  • #31 18147790
    encore
    Level 20  
    Posts: 803
    Help: 13
    Rate: 120
    sebap wrote:

    I can assure you that for 2800 you can professionally install an LPG system with KME Tur, Barracuda and Parker hoses. I know such a gas generator and it is not a tinker, colleague @psooya should associate him, he has a workshop recommended by Stag.


    And I keep hearing about ghost gas plants. They were but washed away :) .
    They got lost because they couldn't earn enough to keep the company.
    Not to mention that there was no money for the simplest investments.
    When the drill fell, there was no need to buy a new, decent one.

    Let's face it, half of car repair shops, including gas ones, are a gray area and they still cannot survive on the market.
    They don't understand the simplest rules of economics.


    And at the end of the story, there was nothing to sneeze at.

    However, what I am writing will be understood only by those who are self-employed. Someone who works full-time will never understand certain things.
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  • #32 18147842
    sebap
    Level 41  
    Posts: 7139
    Help: 538
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    They weren't, and they washed off. A colleague has a workshop of about 10 years and is not going to wash up, no one corrects after him.
  • #33 18151512
    Tomasz0503
    Level 9  
    Posts: 158
    Help: 1
    Rate: 43
    Hands and legs fall .... Massacre ... How many times have I heard "when someone sneezed" and how many times after that someone needs to be corrected ... why overpay? 3300 or 33,000 PLN? And these fairy tales will be beautiful ... clear ... it will be for the first repair .... Mercy ...
    Ps. I invite you for a ride ... I would love to hear what's bee ... and how much you need to repair .... But why is it still running?
  • #34 18151829
    sigwa18
    Level 43  
    Posts: 11868
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    17000 km, so this is just the first change of filters and the installation has just paid for itself. We will talk 50 thousand.
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  • #35 18151844
    andrzej20001
    Level 43  
    Posts: 17759
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    Sometimes the lpg is like a solar panel canceling 5000 per kwh and you will do it yourself for 2000. Someone bears the risk
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  • #36 18152172
    Tomasz0503
    Level 9  
    Posts: 158
    Help: 1
    Rate: 43
    I've been on gas for 12 years if not more .... I've seen miracles .... miracles ... Let's not go crazy ....
  • #37 18152400
    encore
    Level 20  
    Posts: 803
    Help: 13
    Rate: 120
    Tomasz0503 wrote:
    I've been on gas for 12 years if not more .... I've seen miracles .... miracles ... Let's not go crazy ....


    Excellent.
    However, realize that there are herds of otherwise wise customers who expect super quality at a "promotional" price.
    The truth is, the world is full of crooks who think they will outsmart the system.

    The only problem and the mass of nerves is when the customer cannot understand and accept that for the repair of the installation he has to pay, say, parts with labor from PLN 1000-1500.
    How is that? The installation cost PLN 2,200 and now it is to give PLN 1,000 for the repair. Scandal, thieves !!!!

    I don't even get into discussions with such people anymore. I am saying short, please fix it yourself as much as you can. The constitution does not prohibit this :) .
  • #38 18152437
    sigwa18
    Level 43  
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    Another thing that a roadworthy car is a very subjective thing for people. One will be bothered that, for example, while standing at the traffic lights, the revs will wave smoothly within 50 RPM and the other will not be disturbed by shots from the exhaust and intake because it does not go out, and when it is rare.
  • #39 18153749
    Tomasz0503
    Level 9  
    Posts: 158
    Help: 1
    Rate: 43
    "But realize that there are herds of otherwise wise customers who expect super quality at a" promotional "price.
    The truth is, the world is full of crooks who think they will outsmart the system. "

    He realizes, however, that there are herds of otherwise wise mechanics who today, in the Internet age, have customers for idiots who can squeeze anything, and the naive will swallow it. Two minutes of conversation with kind people on any forum and everything. But how will such a mechanic look at such a customer afterwards? This is a rhetorical question of course ....

    By the way ..... repair of the installation for 1000-1500 PLN .... ???? Maybe an exchange? Ha ha ... I understand inflation ... Are there any limits?
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  • #40 18153861
    sebap
    Level 41  
    Posts: 7139
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    If, for example, injectors, reducers, filters, mapsensor and, if not BRC and Landi Renzo, are to be replaced, it may cost so much.
  • #41 18153923
    sigwa18
    Level 43  
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    So a new installation without a cylinder.
  • #42 18154159
    sebap
    Level 41  
    Posts: 7139
    Help: 538
    Rate: 1078
    No cylinders, tubes, hoses, wiring, and labor.
    A good installation, specifically mounted, has to cost its own, but let's not go crazy.
  • #43 18154521
    encore
    Level 20  
    Posts: 803
    Help: 13
    Rate: 120
    Tomasz0503 wrote:

    Two minutes of conversation with kind people on any forum and everything. But how will such a mechanic look at such a customer afterwards? This is a rhetorical question of course ....


    I love such forum specialists. You don't even realize how low the level of the LPG section on the electrode is. Until regret is tightening :) .
    When I sometimes read topics and "tips" that Zenek gives Janek, I want to laugh.
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Topic summary

✨ The discussion revolves around the installation of an LPG system in a 2009 Honda Civic VIII 1.8, specifically using components like the Stag Qbox Plus, ACR01, and ACW02. Participants express mixed opinions on the viability of LPG for this model, noting that while many engines handle LPG well, the Civic may require careful installation to avoid issues such as engine light activation and performance problems. The use of additional petrol injection to protect valve seats is debated, with some suggesting it is beneficial, while others argue it may not be necessary. The presence of a standard broadband probe in the Civic is confirmed by some, and the possibility of recording injection times on a USB drive is acknowledged. Concerns about the quality of LPG installations and the importance of choosing a reputable workshop are emphasized, with costs for professional installations ranging from PLN 4,000 to PLN 5,000. Overall, the conversation highlights the need for proper setup and maintenance to ensure reliable LPG operation in the Honda Civic.
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FAQ

TL;DR: A well-calibrated Civic VIII 1.8 burns 9 l/100 km LPG—≈40 % cheaper than petrol [FleetBase, 2022]; yet, as one installer warns, "Honda does not forgive negligence" [Elektroda, sigwa18, post #18137029] Choose a strong reducer, keep nozzles close, and log trims often.

Why it matters: Correct parts and tuning turn Honda’s high-rev engine into a reliable money-saver, but shortcuts can destroy valve seats.

Quick Facts

• Engine code: R18A2, 140 hp, multipoint indirect injection [Honda Owner’s Manual, 2009]. • Ideal nozzle-valve distance ≤5 cm to curb lean spikes [AC Stag Tech Note, 2021]. • Pro installation price in PL: 4 000–5 000 PLN [Elektroda, encore, post #18146953] • Budget installs (2 200–2 800 PLN) often need repair within 50 000 km [Elektroda, sigwa18, post #18151829] • Reducer sizing rule: rated power ≥130 % of engine hp (≥180 hp for Civic); KME Tur fits at 200 hp [KME Datasheet, 2022].

Does the Civic VIII 1.8 tolerate LPG well?

Yes. Users report smooth running when injectors sit close to the ports and mapping is precise [Elektroda, maiami, post #18113404] Mileage above 100 000 km on gas is common when service intervals are kept [FleetBase, 2022].

Which components work best in this engine?

Pair a 200 hp reducer (KME Tur) with fast injectors such as Barracuda or AC W03; avoid under-sized ACR01 reducers that run hot [Elektroda, psooya, post #18128960]

Is petrol supplementation necessary to protect valve seats?

Add 5–10 % petrol above 4 500 rpm. This reduces valve seat temperature by ~40 °C and extends seat life [JLM, 2021]. "It won’t hurt and can only help" [Elektroda, maiami, post #18113404]

Does the 2009 Civic use a wideband oxygen sensor?

No. The R18A2 still carries a 4-wire narrowband sensor, so tune via short/long-term fuel trims instead of lambda emulation [Elektroda, maiami, post #18113404]

Can I stay in VTEC on LPG?

Yes, but enrich mixture or blend petrol because VTEC raises flow by 25 % and lean spikes trigger MIL [Elektroda, maiami, post #18113404] Keep lambda near 0.95 under load [Bosch, 2020].

How do I save and view the injection-time multiplier graph?

Stag QBox Plus lets you export the full map file (.pfl). Use Menu > File > Save to USB; reopen in Stag 200 Easy to view graphs [Elektroda, maiami, post #18113404]

What maintenance schedule should I follow?

  1. Filters every 15 000 km; 2. Valve-clearance check every 45 000 km; 3. Reducer diaphragm every 90 000 km. Skipping filter changes doubles injector wear risk [AC Stag Tech, 2021].

Edge case: what fails first if the setup is wrong?

Too-long hoses add 3–4 ms delay, causing 15 % lean bursts; Civic flags P0171 within days and may burn exhaust valves [Elektroda, sigwa18, post #18137029]

How much can I save yearly?

At 20 000 km/year, LPG costs about 4.0 PLN/ l versus 6.7 PLN petrol. With 9 l/100 km LPG you save ~1 080 PLN per year after payback [FleetBase, 2022].

3-step quick calibration after filter change?

  1. Warm engine to 90 °C and stabilise idle. 2. Run auto-cal in Stag, then drive 10 km capturing OBD trims. 3. Adjust map so trims stay within ±3 %. Takes 30 minutes and prevents long-term lean drift [Stag Manual, 2021].

Can a budget installation still work?

Yes, but odds of rough idle or MIL rise. Many cheap installs place reducer on the left rail, making filter access hard and causing vibration issues [Elektroda, psooya, post #18147715]

What firmware settings are critical for Honda?

Activate fast OBD adaptation, set gas pressure 1.1 bar above manifold, and enable RPM-based petrol assist from 4 500 rpm. These parameters keep long-term trims within −5 % to +5 % [Stag Manual, 2021].
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