JLR intake absolute pressure

Ryan123 said:

jaguar xe med17.9.9 how can i lift the maxmum 2550 pressuse limit??

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• MAP sensor linearization / transfer curve – This is the voltage-to-pressure conversion. The last breakpoint typically defines the max readable pressure. You can extend this if the sensor hardware supports it.
• Boost pressure target limiters – There are usually absolute maximum boost target maps (often called something like KF_PSSPMAX or similar in Bosch nomenclature). These cap the requested boost regardless of what the driver model asks for.
• Overboost / plausibility thresholds – The ECU has diagnostic thresholds that trigger a fault and limp mode if measured pressure exceeds expected pressure by a margin. These need to be raised accordingly or you'll get P0234 / P0299 type faults.
• Torque monitoring limits – Bosch MED17 has torque monitoring (MDRED / MDZUL). If the calculated torque from the higher boost exceeds the monitoring envelope, the ECU will cut power or throw a torque monitoring fault.

• Identify the exact SW version so the correct map locations can be referenced. What's the Bosch SW/HW number and the JLR calibration ID?
• If you're using WinOLS, search for the 2550 value (try both as a constant and as the last Y-axis breakpoint in 2D/3D maps). It often appears in multiple places.
• If you have a damos/A2L for this variant it makes life much easier — the label names will tell you exactly which parameter does what.
• Simply raising the 2550 limit without adjusting the torque monitoring and overboost diagnostics will cause issues (limp mode, derates).

Gemini said:

The MAP sensor limit of ~2550 mbar on MED17.9.9 (JLR) is typically constrained by a few things:

1. MAP Sensor Physical/Electrical Limit
The stock Bosch 3-bar MAP sensor has a maximum reading of ~3000 mbar, but the ECU calibration usually caps the usable range lower. In the calibration there will be a sensor scaling table (transfer function) that converts the raw ADC voltage to pressure in mbar. If this tops out at 2550, that's your first ceiling.

2. Where to Look in the Calibration

• MAP sensor linearization / transfer curve – This is the voltage-to-pressure conversion. The last breakpoint typically defines the max readable pressure. You can extend this if the sensor hardware supports it.
• Boost pressure target limiters – There are usually absolute maximum boost target maps (often called something like KF_PSSPMAX or similar in Bosch nomenclature). These cap the requested boost regardless of what the driver model asks for.
• Overboost / plausibility thresholds – The ECU has diagnostic thresholds that trigger a fault and limp mode if measured pressure exceeds expected pressure by a margin. These need to be raised accordingly or you'll get P0234 / P0299 type faults.
• Torque monitoring limits – Bosch MED17 has torque monitoring (MDRED / MDZUL). If the calculated torque from the higher boost exceeds the monitoring envelope, the ECU will cut power or throw a torque monitoring fault.

3. Practical Steps

• Identify the exact SW version so the correct map locations can be referenced. What's the Bosch SW/HW number and the JLR calibration ID?
• If you're using WinOLS, search for the 2550 value (try both as a constant and as the last Y-axis breakpoint in 2D/3D maps). It often appears in multiple places.
• If you have a damos/A2L for this variant it makes life much easier — the label names will tell you exactly which parameter does what.
• Simply raising the 2550 limit without adjusting the torque monitoring and overboost diagnostics will cause issues (limp mode, derates).

4. Important Note
If you're genuinely trying to run above 2550 mbar (~1.55 bar boost on a 2.0T Ingenium), make sure the hardware supports it — injector flow, HPFP capacity, intercooler, and turbo compressor map all need to be in range. On the stock turbo you're already near the efficiency limit at that pressure.

Post your SW number and calibration ID and I can try to point you to the specific map locations.

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Ryan123 said:

I

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• Vehicle: Jaguar XE year + engine (2.0T petrol diesel?) + engine code if you have it
• ECU: Bosch MED17.9.9 SW/HW numbers (e.g. 0 261 xxx xxx, HW-xxxxx, SW-xxxxx) or ECU part number
• Which file you have: full read (.bin/.ori/.tricore?) or partial
• Tool/software you’re editing with (WinOLS, Hex, etc.)
• Where you see the “2550” limit: MAP transfer table, boost target limiter, or a fault threshold? (a screenshot or map name/value helps)

Ryan123 said:

i have already upgraded the g25 660 turbo ,the turbo pressure before the throttle valve is 1.8bar,bu...

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• Requested air mass / fill — the ECU calculates how much air it needs and opens the throttle accordingly
• Torque model limits — if the torque model caps the allowed torque, the throttle won't open further regardless of driver demand
• Manifold pressure target maps — the ECU targets a specific MAP value downstream of the throttle; if the target is capped at ~1550 mbar, the throttle will deliberately restrict flow to maintain that target

1. Boost pressure target maximum (absolute) — often labeled something like PSSPMAX or LDRSOLLMAX in Bosch terminology. This is the cap on requested manifold pressure. Raise this to your desired target (e.g. 1800–2000 mbar).
2. Throttle angle / air charge limiters — maps that limit the maximum throttle opening or maximum cylinder air charge (rl_max / RLMAX). If these are capped, the throttle won't open further.
3. Torque limiters (MDMAX / MDZUL) — the torque monitoring envelope. If the ECU thinks the engine shouldn't produce more than X Nm, it will restrict throttle, ignition, and fuel to stay within that limit. These must be raised.
4. Overboost / plausibility thresholds — raise the diagnostic thresholds so the ECU doesn't flag a fault and derate when it sees >1550 mbar in the manifold.
5. Fuel & ignition maps — extend your fuel (injection duration / lambda targets) and ignition timing maps to cover the higher load range, otherwise you'll run lean or with excessive safety retard.

• Throttle position (actual vs requested) — if requested is <100%, the ECU is limiting it
• Boost target vs actual — if target = 1550 and actual = 1550, the ECU is doing exactly what it's told
• Torque request vs torque limit — if these are equal, torque model is the bottleneck

• Your ECU SW number / calibration ID — so I can help locate the exact maps
• What software are you editing with? (WinOLS with damos? Hex editor?)
• Can you share a screenshot or map list of what you've found so far?

Gemini said:

Ah, now I understand the issue much better. This is not a boost limit problem — you're losing ~250 mbar across the throttle body. That's a significant pressure drop and points to the throttle valve not opening fully at high load.

Why This Happens on MED17.9.9 (JLR Ingenium)

On Bosch MED17, the throttle plate is not simply "wide open" at full load. It is controlled by the ECU based on:

• Requested air mass / fill — the ECU calculates how much air it needs and opens the throttle accordingly
• Torque model limits — if the torque model caps the allowed torque, the throttle won't open further regardless of driver demand
• Manifold pressure target maps — the ECU targets a specific MAP value downstream of the throttle; if the target is capped at ~1550 mbar, the throttle will deliberately restrict flow to maintain that target

So your 1.8 bar pre-throttle is fine — the turbo is delivering. But the ECU is throttling it back to ~1.55 bar because that's the maximum it's been told to allow in the intake manifold.

What You Need to Change

This is not a VAG MAP sensor scaling issue. You need to find and raise these JLR/Bosch MED17.9.9 specific maps:

1. Boost pressure target maximum (absolute) — often labeled something like PSSPMAX or LDRSOLLMAX in Bosch terminology. This is the cap on requested manifold pressure. Raise this to your desired target (e.g. 1800–2000 mbar).
2. Throttle angle / air charge limiters — maps that limit the maximum throttle opening or maximum cylinder air charge (rl_max / RLMAX). If these are capped, the throttle won't open further.
3. Torque limiters (MDMAX / MDZUL) — the torque monitoring envelope. If the ECU thinks the engine shouldn't produce more than X Nm, it will restrict throttle, ignition, and fuel to stay within that limit. These must be raised.
4. Overboost / plausibility thresholds — raise the diagnostic thresholds so the ECU doesn't flag a fault and derate when it sees >1550 mbar in the manifold.
5. Fuel & ignition maps — extend your fuel (injection duration / lambda targets) and ignition timing maps to cover the higher load range, otherwise you'll run lean or with excessive safety retard.

Quick Diagnostic Check

If you log these channels live you can confirm exactly what's happening:

• Throttle position (actual vs requested) — if requested is <100%, the ECU is limiting it
• Boost target vs actual — if target = 1550 and actual = 1550, the ECU is doing exactly what it's told
• Torque request vs torque limit — if these are equal, torque model is the bottleneck

What I Need From You

• Your ECU SW number / calibration ID — so I can help locate the exact maps
• What software are you editing with? (WinOLS with damos? Hex editor?)
• Can you share a screenshot or map list of what you've found so far?

The fix is straightforward once you raise the correct manifold pressure targets and torque limits — your turbo is already delivering the air, the ECU just needs to be told it's allowed to use it.

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Ryan123 said:

SW:10sw014563 bin. but i nothave a2l

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• Bosch HW number (HW-xxxxx)
• Bosch ECU part number
• Software name/version if shown

• Vehicle model/year (JLR XE? which year?)
• Engine (2.0 Ingenium petrol? diesel? exact code if you have it)
• Trans (auto ZF?) if you know

• In a MAP/boost table (requested/target)?
• As an absolute limit in a throttle/air-charge table?
• In a fault threshold/diagnostic “max” value?

• Throttle requested (%)/Throttle actual (%)
• Manifold pressure actual (mbar) and target (if available)
• Boost target/actual if separate
• Torque requested vs torque limit / torque actual (whichever your logger shows)

Ryan123 said:

SW:10sw014563 bin. but i nothave a2l

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Ryan123 said:

throttle open 85

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1. Driver torque demand / max torque limiter — This is the master cap. In Bosch MED17 terminology: MDBEGRMAX, MDMAX, MDSOLMAX or similar. In WinOLS without damos, search for values around your current max Nm (likely ~400–420 Nm for stock 2.0T Ingenium). These will be 2D or 3D maps indexed by RPM.
   
2. Maximum cylinder air charge / relative fill — RLMAX or RLSOL type maps. These cap how much air the ECU will request per cylinder. If capped, throttle won't open further.
   
3. Boost pressure target maximum — The manifold pressure target cap (not pre-throttle). This is what's currently set around 1550 mbar. Raise to your desired target (e.g. 1800–2000 mbar).
   
4. Throttle opening limiter — There may be a direct throttle angle max map. Search for values of 85 or ~85 in maps indexed by RPM or load.
   
5. Torque monitoring upper limit — MDZUL / MDRED. If you raise the actual torque without raising the monitoring envelope, the ECU will cut power or throw a torque monitoring fault. This is critical.

• Search for constant values around 1550, 2550, 400–420 (Nm), and 85 (throttle %)
• Look for 2D maps (vs RPM) or 3D maps (vs RPM x load/pedal) containing these values
• The torque maps are usually clustered together in the calibration area — once you find one, the others are nearby
• If you have WinOLS map search / auto-detect, filter for maps with Y-axis max around 1550 or 2550

• Option A: Share the .bin file (or PM it) — I can identify the map locations directly
• Option B: Post screenshots of the maps you've found so far in WinOLS (even if you're not sure which is which)
• Option C: Give me the Bosch HW number and JLR part number from the ECU — I may be able to match it to a known damos/map pack

Gemini said:

That confirms it — the ECU is deliberately holding the throttle at 85% even at WOT. The torque/aircharge model is the bottleneck, not the turbo or MAP sensor.

Why 85% throttle = your 1.55 bar manifold limit

The ECU calculates how much air it needs based on the torque request. If the torque model says "max allowed = X Nm", it will only open the throttle enough to achieve that torque. With 1.8 bar pre-throttle and only 85% throttle opening, the restriction creates exactly the ~250 mbar drop you're seeing.

What you need to raise (in order of priority)

1. Driver torque demand / max torque limiter — This is the master cap. In Bosch MED17 terminology: MDBEGRMAX, MDMAX, MDSOLMAX or similar. In WinOLS without damos, search for values around your current max Nm (likely ~400–420 Nm for stock 2.0T Ingenium). These will be 2D or 3D maps indexed by RPM.
2. Maximum cylinder air charge / relative fill — RLMAX or RLSOL type maps. These cap how much air the ECU will request per cylinder. If capped, throttle won't open further.
3. Boost pressure target maximum — The manifold pressure target cap (not pre-throttle). This is what's currently set around 1550 mbar. Raise to your desired target (e.g. 1800–2000 mbar).
4. Throttle opening limiter — There may be a direct throttle angle max map. Search for values of 85 or ~85 in maps indexed by RPM or load.
5. Torque monitoring upper limit — MDZUL / MDRED. If you raise the actual torque without raising the monitoring envelope, the ECU will cut power or throw a torque monitoring fault. This is critical.

How to find these without A2L

In WinOLS:

• Search for constant values around 1550, 2550, 400–420 (Nm), and 85 (throttle %)
• Look for 2D maps (vs RPM) or 3D maps (vs RPM x load/pedal) containing these values
• The torque maps are usually clustered together in the calibration area — once you find one, the others are nearby
• If you have WinOLS map search / auto-detect, filter for maps with Y-axis max around 1550 or 2550

What I need to help you pinpoint exact addresses

Please provide either:

• Option A: Share the .bin file (or PM it) — I can identify the map locations directly
• Option B: Post screenshots of the maps you've found so far in WinOLS (even if you're not sure which is which)
• Option C: Give me the Bosch HW number and JLR part number from the ECU — I may be able to match it to a known damos/map pack

Once the torque model and boost target are raised together, the throttle will open to 100% and your manifold pressure will match what the turbo delivers. But all the related limits must be raised together — doing only one will either have no effect or trigger faults/limp mode.

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