Instant download
BMW E30 320i Stage 1 file Bosch HW 0261200172 · SW 355744
1990 · Petrol · 129 hp (95 kW)
Choose your file
Dyno sheet
- Power
- 141 hp +12
- Torque
- 180 Nm +16
Typical crank figures for a healthy 320i. Results depend on the car's condition, fuel and parts.
- Power
- 129 hp 95 kW
- ECU
- Bosch
- Engine
- 320i Petrol
- File
- 32 KB BIN, ready to write
Bosch on the BMW E30 320i
Software and hardware
- Hardware
- 0261200172 Bosch's number for the ECU itself, on its label
- Software
- 355744 (1037355744) The software inside: your read must show this number
Built on request for the BMW E30 320i
- DTC off
- Speed limiter (Vmax) off
Request a custom solution Any file £50, from £30 in packs, every option in the one price.
Not the one? Find another
By the numbers in your tool, or by the car.
Or search this file's own
Is this the file for your read?
Drop your read and we compare it with this file, number by number. It stays private.
- Read the file on your computer
- Look for it in our files
- Upload it, kept private
- Compare it with this file
From read to write
- Read the ECUKeep the read: it is your way back.
- Match the numbershardware 0261200172 and software 355744
- Pay and downloadThe file is in your account straight away.
- Write it backThe way you read it. Not right for your car? We correct it free.
Before you write the file
- A battery charger on the car: a write takes minutes and the voltage must not drop.
- Your own read saved twice, on two different drives: it is your way back.
- Your read shows hardware 0261200172 and software 355744 (1037355744), the same as this file.
- Fault codes read and noted before the write, and cleared after it.
- The same tool and connection you read the ECU with.
About this file
What this Stage 1 file is
This is a Stage 1 tune of the factory calibration of the 1990 BMW E30 320i (94.9 kW, 129 hp), for its Bosch ECU with hardware 0261200172 and software 355744 (1037355744). Stage 1 is software only: the car keeps its standard turbo, injectors, intercooler and exhaust.
Stage 1 on the 320i refines the ignition timing and the fuelling across the rev range; on an engine without a turbo the gain is modest, the throttle answers sooner.
The BMW E30 320i carries the 320i engine, 129 hp and 164 Nm from the factory. On this engine, Stage 1 usually gives about 141 hp and 180 Nm (+12 hp, +16 Nm). Typical figures for a healthy engine: your car's own result depends on its condition, fuel and parts.
For software 355744 of the BMW E30 320i we sell the original and Stage 1, each made from the same original read. Every file downloads straight after payment.
Read the Bosch ECU with your usual tool and keep the read: compare its hardware and software numbers with the ones on this page before you write the file.
DTC off and speed limiter (Vmax) off can be added to this file on request, for off-road and competition use: send us your read through our file service and our engineers add them (any file £50, from £30 in packs).
Hardware 0261200172 is the number on the Bosch ECU's label. Software 355744 (1037355744) is the calibration inside it: a read with hardware 0261200172 and another software number needs a different file.
Questions
Which ECU does this BMW E30 320i Stage 1 file fit?
A Bosch ECU with hardware 0261200172 and software 355744 (1037355744). Check those numbers in your read before you write it; another software number needs another file, which our engineers can build from your read.
How is the Bosch ECU read and written?
With your usual reading tool, over OBD or on the bench as the tool allows. Write the file back the same way you read the ECU, and keep your original read.
What does Stage 1 give on the BMW E30 320i?
Usually about 141 hp and 180 Nm against 129 hp and 164 Nm stock (+12 hp, +16 Nm). Typical for a healthy engine, never a promise for one car.
Can you add DTC off and speed limiter (Vmax) off to the Bosch ECU file?
Yes, on request, for off-road and competition use: DTC off and speed limiter (Vmax) off. Upload a read through our file service and an engineer builds it (any file £50, from £30 in packs). The buyer is responsible for using it where the law allows.
What exactly is in the download?
A BIN file of 32 KB, ready to write. Write it with the same tool and the same connection you read the ECU with.
Does software 355744 fit other cars?
We also sell this software for the BMW E34 520i and BMW E30 325i. The hardware number on your ECU decides whether the same file fits: match it before you write.
How do I get the file after paying?
It is in your account as an instant download straight after payment by card, Apple Pay or Google Pay: the BIN file, ready to write.
What if the file does not fit my car?
Send us your read and we correct it free, as many times as it takes. Questions before you buy are answered by a tuner on WhatsApp.
I need a file
A file for the car in front of you
Our engineers tune your read, or the file is already in the library.
- I run a tuning businessYour own file portal
- PartnersA file service behind your brand