Should a workshop tune its own files or buy them?

Every workshop that sells remaps reaches this question. Buying files feels like paying someone else for your own work, while writing them feels like a big step into something that can go badly wrong. Both are reasonable, and the right answer depends on your numbers.

What are you really comparing?

When does buying make more sense?

When you are spread across many makes, when you do a few cars a week, or when nobody on the team loves this work. A good file service has seen your car many times already, and it costs you less than a mistake would. You also get the second opinion that a one-person shop never has.

When does writing your own make sense?

When you see the same few engines week after week, because each file you write gets faster. When you have a person who wants to learn properly and has time to do it. And when your customers will pay more for something a generic file does not offer, such as a particular race class, or a converted vehicle that nobody else has mapped.

The question is not whether you could learn. It is whether that is the best use of your best person's week.

Can you do both?

Yes, and many workshops do. Write the cars you know, and send out the ones you do not. You will usually need a master for your own work and a good relationship with a file service for the rest, which means plain reads rather than locked slave files for that second route.

What should you check at a file service?

• How fast do they answer at the times you work?
• What happens if the file is not right? Corrections should be free, on the same job, and quick.
• Do they keep your originals, so you can go back?
• Can you pay before work starts with credits or by card, without chasing invoices?
• Will they give you your name on the paperwork? A certificate and dyno sheet in your brand is what your customer sees.

What if you want to sell files yourself one day?

That is often how a file service begins. A workshop gets good, its neighbours start asking, and suddenly it has customers of its own. A portal under your own name lets you start small and open more of it as you grow, and on Start there is no monthly fee.