ECU remapping in Comrie — done properly, on a rolling road, by people who understand engines. Whether you want more performance, better fuel economy, or both, we'll set your car up safely within its mechanical limits and prove the results on the dyno.
We've got our own Dynapack rolling road, which means we can prove every tune with real numbers. Owen writes custom calibrations for each car. Comrie drivers benefit from having this level of expertise on their doorstep.
A well-maintained car gets the most from a remap. If your car is due a service — especially oil, air filter, and fuel filter — it's worth getting that done before or at the same time as the tune.
If you're adding significant power — especially Stage 2 — it's worth considering whether your brakes are up to the job. We can advise on upgrades if needed, or at minimum ensure your standard brakes are in top condition before we tune.
On manual cars, a remap puts more torque through the clutch. If yours is already showing signs of wear, it'll likely get worse after a remap. We'll check clutch condition before tuning and let you know if it needs replacing first.
Before any remap, we run a full diagnostic scan to check for fault codes, sensor readings, and system health. We also do a pre-tune dyno run to establish your car's baseline power and torque, so we can show you exactly what the remap has achieved.
The most common concern people have about remapping is reliability. Done properly, a Stage 1 remap works within your engine's safe limits — we're adjusting fuelling, boost pressure, and ignition timing to unlock performance the manufacturer left on the table. We always check the car's mechanical condition first.
Book in for a half-day session. We'll check the car over, run a baseline dyno test, carry out the remap, and then do comparison runs to show you the gains. You'll drive away with a printout of your before-and-after power figures.
"We always recommend a Stage 1 remap first. It's safe, effective, and keeps everything within the engine's design limits." — Bob, Workshop Owner
After a remap, use good quality fuel — don't cheap out on supermarket diesel if you've had a performance tune. Keep up with your servicing, and if you notice anything unusual, get it checked promptly.
We're based in Birnam with our own rolling road facility. Comrie drivers can reach us easily — about a 30 min drive. We remap cars from across St Fillans, Dalginross, Cultybraggan, Glen Lednock and the wider Perthshire area.
Comrie — straight from Bob
Being based in the heart of Perthshire, I know exactly what your car has to deal with. Whether you're hauling a sheep trailer up the Sma' Glen or commuting from Comrie toward the A9 every morning, you need torque that's actually usable. I’ve spent over three decades seeing how the damp Scottish air and our steep climbs take a toll on engines that are strangled by factory 'average' settings. A remap isn't just about 'boy racer' speed; it’s about making a Land Rover Discovery or a Volvo XC60 actually pull through the gears without hunting. I focus on smoothing out the delivery so when you’re overtaking a slow-moving timber lorry on the road to Lochearnhead, you’ve got the grunt there the second you bury your right foot.
The faults I see most on Comrie cars
Up here around Comrie and St Fillans, I see a lot of Mitsubishi L200s and Navaras used for estate work that are absolutely choked with soot because they never get a good run. A remap on a 2.5 DI-D with 80k on the clock is a waste of time if the manifold is restricted. I also see plenty of Volkswagen T6 Transporters (2.0 TDI) coming over from the glens with 'flat spots' when towing. Usually, it's a sticking VNT turbo vane issue caused by too many short trips. Then there’s the BMW 320d (N47 engine) owner who wants more poke but hasn't realised their timing chain is already rattling like a bag of nails. We won't touch a map on those until the mechanicals are sorted, because the extra torque will just snap that chain faster.
Honest ecu remapping pricing for Comrie
Let’s talk straight: a proper, safe ECU remap for a modern diesel should set you back between £250 and £350. If someone's offering to do it in a car park for £150, run a mile—they're likely using cracked software that bypasses safety limiters. A 'speed soul' or 'economy' map on something like a Transit Custom or a Golf GTD is an investment in drivability. Main dealers will often charge you £600+ for 'performance software' that’s basically just the factory map from a higher-spec model. Don't pay it. Spend your money on a Bosch fuel filter and a decent oil change (Castrol Edge or Shell Helix) at the same time as the remap; it’s the best way to protect your injectors.
What actually happens at the ecu remapping
An ECU remap shouldn't cause an MOT fail, provided it's done right and doesn't involve 'deleting' hardware. I’ve seen lads from Crieff come in having had a 'cheap' map that just dumps extra fuel in to get power, which sends the smoke opacity (the 'smoke test') sky-high, leading to a straight fail. In the service bay, some garages will try to upsell you on 'injector cleaning services' if they see a remapped car, claiming the map is 'stressing' the system. It’s nonsense. If the car is mapped correctly, your injector pulses are precise. The biggest trap is when a main dealer 'updates' your software during a routine service and wipes your custom map clean away—always tell the service desk not to perform 'unauthorised software flashes.'
Getting to us from Comrie
Driving over from Comrie is a decent little run out. You’ll head east through Crieff, likely getting stuck behind a tractor or two on the A85 before you get a clear run. It's about a 30-minute jaunt, and honestly, the drive back is where the fun starts once the new software is loaded. Most folks from out that way drop the car with us in the morning and take one of our courtesy cars—usually a tidy little Aygo or a Corsa—to head into Perth for a bit of shopping while I spend a few hours getting the parameters just right on my bench. It beats sitting in a cold waiting room.
When to DIY and when to bring it in
You can buy 'plug-and-play' tuning boxes off the internet for £100, but they're mostly just resistors in a fancy plastic case that trick the fuel rail sensor. They’re a DIY disaster waiting to happen. A proper remap involves accessing the 'brain' of the car, often requiring us to bridge pins on the circuit board or use an OBD tool that costs more than a decent second-hand car. Unless you’ve got a master-version Kess or K-Tag tool and a very expensive subscription to a file writer, this isn't a driveway job. The only DIY bit you should be doing is making sure your air filter is spotless (get a Mann or Wix one) and your battery is healthy before you bring it to me.
Bob's tip
When you're calling up, don't just ask for 'more power.' Ask specifically if they carry out a full diagnostic health check before touching the software. A proper mapper should check your fuel trims and turbo boost pressure first. I always tell folks from the Strathearn valley to insist on a 'stage 1 longevity' map rather than an aggressive 'smoke' map. It’ll save you a fortune on premature DPF replacements and warped exhaust manifolds. Also, if you’ve got an older car, ask if they’ve got a battery stabiliser—remapping a car while the battery voltage is dropping is the quickest way to brick an ECU and turn your motor into a very expensive paperweight.
Common questions from Comrie drivers
How far is your garage from Comrie?
We are based in Birnam near Dunkeld (PH8 0DN), about 25 miles from Comrie — roughly 30 min in the car. Plenty of our customers drop the car off first thing and collect it after work.
Will I get a price before any work starts?
Yes. You get a written quote covering parts, labour and VAT before we touch the car, and if we find anything else while we are in there we stop and phone you first. Nothing gets added to your bill without your say-so.
Does using an independent garage affect my manufacturer warranty?
No. Under UK block exemption rules you can have your car serviced anywhere as long as the manufacturer schedule is followed using equivalent-quality parts. That is exactly what we do, and we stamp the service book.
How long will my car be off the road?
Most servicing, MOT, brake and diagnostic work is done the same day. Bigger jobs such as clutches, timing belts or head gaskets usually take a full day or two, and we tell you honestly when you book rather than keeping the car longer than promised.
Do you also do MOTs for Comrie drivers?
Yes — class 4 cars and small vans, currently £54.85. If something fails we will explain exactly what it is, what it will cost to put right, and what is safe to leave.
Can I just get a diagnosis without booking the repair?
Absolutely. Plenty of people come to us purely to find out what is actually wrong. We read the fault codes, check live data and test the circuit or component properly, then tell you what it needs and what it would cost. There is no obligation to have the work done here.
Which areas around Comrie do you cover?
We look after cars from right across Perthshire, including Crieff, St Fillans, Lochearnhead, Auchterarder, and the wider Perthshire and Tayside area.
What if something is not right after I collect the car?
Bring it straight back. Our labour is guaranteed and Bob has 32 years on the tools — if a job is not right we put it right, and we would far rather sort it than have you tell your neighbours otherwise.
Questions drivers in Comrie ask most
- How much does a car service cost?
- Do I need to tell my insurer about a remap?
- How much MPG can a remap save me?
- How long does an ECU remap take?
- Can an ECU remap be removed?
- Common myths about ECU remapping
Vehicle services in Comrie
ECU remapping at Bob's Mechanical Repairs · All areas we cover