Remapping the Alpina B3 S, 3.5i 400HP.
The Alpina B3 S's 3.5i 400HP responds evenly to remapping, with BHP rising 12.5% to 450bhp alongside a closely matched 11.1% torque increase to 600Nm.
As a naturally aspirated petrol, gains are more modest by nature, and this worthwhile improvement is best appreciated as sharper throttle response rather than a transformed power band.
Typical remap gains for the B3 S 3.5i 400HP
Standard vs Remapped
Standard vs Remapped
- Power: 400bhp standard, 450bhp after a Stage 1 remap.
- Torque: 540Nm standard, 600Nm after a Stage 1 remap.
- This is a balanced gain: power and torque increase by a similar margin, rather than one outpacing the other.
- This is a naturally aspirated engine, so headroom beyond Stage 1 is limited compared with a turbocharged equivalent.
- As a petrol engine, the practical benefit is mainly felt as sharper throttle response and a broader power band.
- These are Stage 1 figures only, achieved without any hardware changes.
Questions about remapping your B3 S 3.5i 400HP
How much power and torque does a Stage 1 remap add to the Alpina B3 S 3.5i 400HP?
A Stage 1 remap typically takes the Alpina B3 S 3.5i 400HP from 400bhp to around 450bhp, and torque from 540Nm to around 600Nm. This is a worthwhile gain achieved entirely through software, with no hardware changes required.
Is the Alpina B3 S 3.5i 400HP a good candidate for remapping?
Generally, yes: as a naturally aspirated engine its headroom is more limited, though a well-executed remap can still sharpen throttle response, and the worthwhile gain shown here reflects that. The main caveats are condition, not the engine itself, a healthy service history, no outstanding fault codes, and (for diesels) a clear DPF and EGR are what actually determine whether this particular car is ready for a remap.
Will remapping affect the warranty on my Alpina B3 S?
A manufacturer can only void the parts of a warranty that the remap directly affects, not the entire vehicle, under the Consumer Rights Act and EU Block Exemption principles. In practice, on a Alpina B3 S 3.5i 400HP this usually means engine and transmission-related claims are the ones worth discussing with a reputable tuner before booking.
What should I check before booking a remap for my Alpina B3 S 3.5i 400HP?
Before booking, confirm the tuner uses a custom or bespoke file rather than a generic off-the-shelf map, ask whether they do a pre-remap health check, and check service history and mileage on your specific Alpina B3 S.
What's the difference between a Stage 1 and Stage 2 remap for the 3.5i 400HP?
Stage 1 is software-only and is what the figures on this page reflect. Stage 2 builds on that, but on a naturally aspirated engine like this, the scope for a Stage 2 remap is limited, since there is little forced induction to work with, so it is a separate conversation with a tuner rather than an automatic next step.
Will remapping my Alpina B3 S affect my insurance?
Yes, always, a remap is a modification and must be declared to your insurer regardless of size. Given this worthwhile gain on the 3.5i 400HP, expect a likely premium increase, and it is worth getting a quote from a specialist modified-vehicle insurer before booking the remap itself.