@kev017 - I don’t have experience with the BBR map directly, but I have devoted the last few weeks of my life (!) to developing a DIY tune for my 1.5 ND1 using VersaTuner. Total cost for the software was around £375 and I needed a cable at £50. That’s for the ‘full’ version which allows you to create your own maps. If you just want to ‘flash’ someone else’s map, you can use a ‘Lite’ version of the software which is around £220 ($249USD). The software is locked to your VIN number so you can’t use your kit on any other car, but at less than half the price of a BBR map, I think it’s a viable option for some people.
Anyway… the numbers I’ve ended up with are very comparable to BBR, and I can say that the car is a very different thing now. With an extra 400 revs bolted on the top of the rev range, and an extra ~10% torque from 5000rpm all the way up to the limiter, the car really zips along when you get on it. The additional low end torque is a little more modest (between 3 and 8ft/lbs depending on where you are in the rev range), but does still feel noticeable with normal driving - kind of feels a bit like being in a half gear down between two, if that makes sense.
I’ve actually spent more time developing the driveability of the car than the WOT power, there are a lot of subtle gains to be had here. Smoothing ignition tables, smoothing out throttle response, tweaking MAF scaling especially at low rpm / TPS, improving throttle blip for rev matched downshifts, adjusting the rev limiter in each gear (has weird behaviour as standard), that sort of thing. I guess it feels like ‘OE Plus’, if that makes sense - driving just like the stock car when pootling, except smoother and slightly better fuel economy (ignition timing also optimised in the cruise sites, so it makes more power for the same amount of fuel - alternatively put, the same power for less fuel), then pulls much harder when you hit the go pedal. All the standard fuel enrichment, EGT / cat protection, etc stuff is still in place too, which is a nice backup. You could take things further if you change the manifold too (a couple of degrees of timing and reduce some of the EGT protection stuff since the first cat disappears).
The only ‘problem’, as Dave276 hinted at above, is that you do need to use posh fuel to make the most of it. The extra couple of octane points allow the ignition timing and air fuel ratio to be nailed right down to get the best out of the car. It has some clever tech that will adjust parameters to work safely with normal fuel though, if you need that to happen. But the car does respond very well to proper fuel - even without a remap it will detect ignition timing and adjust it to suit the fuel you are using, amazing stuff.
Basically - a good map will make a really big difference to the car. If you’re anywhere near Preston (Lancs) you are very welcome to come and take mine for a spin. I know it’s not BBR exactly, but from the data I’ve seen from them it is very close (within a few bhp, depending how much number-fudging and dyno tricks have gone on!), plus I don’t know how much time they’ll have spent on the rest of the map. The fancy coloured dyno plots you see are probably only 5% of what’s going on behind the scenes!
There doesn’t seem to be much info around about 1.5 tuning so if you have any questions you think I might be able to answer, feel free to give me a shout.
@Touche , did you get your car dynoed in the end? Intrigued to see what a non in-house dyno says…
Adam