BMW 1 Series 135i - N55 - twinscroll 306hp Remap

Name: BMW 1 Series 135i - N55 - twinscroll 306hp ECU Remap
Brand: BMW

Expected gains of +59 BHP and +120 Nm torque

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BHP+59 hp (19%)

Standard

306 hp

Tuned

365 hp

Torque+120 Nm (30%)

Standard

400 Nm

Tuned

520 Nm

Suitability

Good (7/10)

Gains Profile

Torque-focused

Headroom

High

BMW 1 Series 135i - N55 - twinscroll 306hp ECU Remapping

Considering an ECU remap for your BMW 1 Series 135i - N55 - twinscroll 306hp? A Stage 1 remap can take this E87 - 2007 - 2011 petrol engine from 306 BHP to 365 BHP and from 400 Nm to 520 Nm of torque (turbocharged). This engine scores 7/10 for remap suitability. Get a free personalised quote from a trusted remap professional and find out exactly what your BMW 1 Series can achieve.

How this engine compares

15thof 68 BMW 1 Series engines by power gain
85%of the 9,842 engines we hold gain data for see a smaller power increase
87%of engines with torque data see a smaller torque increase

Comparisons are calculated from our own recorded Stage 1 figures.

Assessment

The BMW 1 serie 135i - N55 - twinscroll 306hp is a 3.0L turbocharged petrol engine producing 306 BHP and 400 Nm from the factory. With a typical Stage 1 remap, output increases to approximately 365 BHP and 520 Nm — a gain of around 59 BHP (19%) and 120 Nm (30%).

This engine has moderate remap suitability, with gains weighted towards torque — you will notice the difference most strongly in mid-range pulling power and in-gear acceleration. The tuning headroom is classified as high, based on the percentage gain available from the factory output.

Considerations: Turbo petrol: fuel quality and cooling can influence repeatable performance.. High tuned torque: check transmission torque capacity and service history.. Large torque increase: drivetrain condition (clutch/gearbox) becomes more important at this level.

All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method. We recommend discussing your specific vehicle with a qualified remap professional.

Other 1 Series E87 - 2007 - 2011 Engines

Engine	BHP	Gain	Torque	Gain	Score
116D 115hp	115 → 180	+65	260 → 390	+130	Excellent (8/10)
116i 122hp	122 → 135	+13	160 → 185	+25	Moderate (4.5/10)
118D 136hp	136 → 180	+44	300 → 390	+90	Excellent (8/10)
118D 143hp	143 → 180	+37	300 → 390	+90	Good (7.5/10)
118i 143hp	143 → 155	+12	190 → 208	+18	Moderate (4/10)
120D 163hp	163 → 215	+52	340 → 420	+80	Good (7.5/10)
120i 170hp	170 → 185	+15	210 → 230	+20	Moderate (4/10)
120D 177hp	177 → 215	+38	350 → 420	+70	Good (7.5/10)
123D 204hp	204 → 245	+41	400 → 450	+50	Good (6.5/10)
125i 218hp	218 → 250	+32	270 → 310	+40	Moderate (4.5/10)
130i 265hp	265 → 285	+20	315 → 340	+25	Moderate (4/10)
135i - N54 306hp	306 → 362	+56	400 → 510	+110	Good (7/10)
1M - 3.0i Bi-turbo 340hp	340 → 375	+35	500 → 560	+60	Good (6/10)

Technical Specifications

Fuel Type: Petrol
Aspiration: Turbocharged
Displacement: 3L
Capacity: 2979 CC
Type: Car
Engine Family: BMW 3.0L N55 NA Petrol

ECU & Transmission

Likely ECU Low confidence: Bosch MEVD/MG1 family (varies)
Gearbox Medium confidence: Many variants use ZF 5/6-speed automatics (where fitted); manuals also exist. At this torque level, transmission and driveline servicing history becomes especially important.

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MakeBMW

Model1 Series

GenerationE87 - 2007 - 2011

Engine135i - N55 - twinscroll 306hp

All figures shown are typical estimates based on aggregated Stage 1 data for this engine variant. Actual results depend on vehicle condition, mileage, and the chosen tuning method.

We recommend discussing your specific vehicle with a qualified remap professional before proceeding.