Don’t shoot!!

Yes and maybe.. Depends on your definition of worth it, there's small gains to be had in torque and driveability and low down poke, theres no outright big bhp gains, maybe 5-10 bhp but you'll notice a small uplift in torque.. Marlon had a whole thread on this back in the day which is probably the most documented on a 3.0si map https://z4-forum.com/forum/viewtopic.php?f=2&t=82745&hilit=quantum+remap

Anyone who hasn't mapped a na engine will tell you the gains are not worth it which is why I said depends on your definition of worth it.. However anyone that has (me included) will likely tell you for the relatively small cost it actually adds a noticeable improvement, certainly not night and day like on a turbo car but a noticeable improvement nonetheless that you feel straight away when driving the first time. Quantum offer a 30 day money back guarantee so you can always get a refund and have it removed if you are not happy with it :thumbsup:
 
Yes they can be remapped.

What are you trying to achieve? For Power increase, it will be so minimal it's not worth it (speaking as someone who has had a 3.0si coupe mapped previously). For specific modifications such as modifying the throttle map, raising the rev limiter etc it might be worth it - you'd have to think carefully about what you want changed.

Whatever you do, avoid generic 'remaps' as often these are a bit of a bodge (although many will swear otherwise). It's important in my opinion to make sure your chosen mapper has bothered to understand the implications of modifying individual maps in the ECU (there are thousands of maps in there). There is a file which describes the maps, called a DAMOS file. Many of the maps on the ECU are interdependent, so modifying one will result in undesired consequences for other maps if the mapper doesn't fully understand the interdependencies. Unfortunately you'll find very few people who have access to the DAMOS file for the MSV70 ECU, much less a properly translated version, hence most 'tuners' are selling basic/generic maps with very little understanding of the modified parameter, or their implications on the engine performance and longevity.

In summary, mapping a car is something I'd approach with a significant degree of caution, do a lot of research yourself first, and choose your mapper carefully. Even then for the likely gains in headline figures, it's not really worth it for most people.
 
You'll get the same performance increase/feel if you lose 50kg from the car as you would if you added 10bhp (i.e. 4% power increase vs 4% weight loss).

Do you feel a significant performance difference with/without a small adult in the passenger seat?
 
Iv had one on the driveway :? :? as I think a few others have on here as well, so no dyno readout I'm afraid. I would say yes it does make a small difference, but you're never going to get really noticeable horsepower gains, expect 4-5% maybe 8-10% if you took it to a really good tuner. There is certainly a little improved torque in the mid range which is nice for day to day driving. Improved fuel economy is also a bonus. If your planning on keeping the car for a long time then yes it probably is worth it, otherwise brakes and tires are a better use of your money.

mr.tourette said:
Anyone who hasn't mapped a na engine will tell you the gains are not worth it which is why I said depends on your definition of worth it.. However anyone that has (me included) will likely tell you for the relatively small cost it actually adds a noticeable improvement, certainly not night and day like on a turbo car but a noticeable improvement nonetheless that you feel straight away when driving the first time. Quantum offer a 30 day money back guarantee so you can always get a refund and have it removed if you are not happy with it :thumbsup:

Pretty much hit the nail on the head with this IMHO :thumbsup: :thumbsup: For me 8-10 more NA horsepower and 15-20NM or torque was worth the £250.00
 
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