Remaps/tuning - what's the catch?

Most cars won't get 50hp from just a remap. They might ask for that, but it won't actually run at that. If you dynoed it, it would probably be way short and get shorter as the engine got hot. It's like overclocking a CPU but not upgrading the cooler, fine until you put it under lots of stress.

Unless it's way over-engineered (e.g like a Supra or Skyline which can get huge power gains from the stock engine), but few modern cars are.
I know my focus Ecoboost 182 will only gain around 20HP or about 11%. If I were to got the official route and use Mountune they also supply a new air box and intercooler but want £1k for it!
 
They are pretty mild out of the box tbh, a simple map seriously wakes them up, kind of criminal to roll around stock with so much unlocked potential.

Mild... really?

I doubt a map will do anything more than give a bit more poke to something that's already as fast if not faster than 99% of cars on British roads.
 
Yeah really. Sounds like you've never even driven one with a map, believe me it's considerably faster and you would never want to go back.
 
There seems to be a lot of opinion from people who obviously don't really know too much about it.

OP, if you are seriously considering a map for your car, I'd suggest speaking to someone who really knows your car. There will no doubt be a specialist tuner for your particular model car that knows all the ins and outs. At least they will be able to explain it all to you, instead of saying "it's like overclocking" without actually knowing.
 
There seems to be a lot of opinion from people who obviously don't really know too much about it.

OP, if you are seriously considering a map for your car, I'd suggest speaking to someone who really knows your car. There will no doubt be a specialist tuner for your particular model car that knows all the ins and outs. At least they will be able to explain it all to you, instead of saying "it's like overclocking" without actually knowing.

Did you read the OP? :p I'm not considering it, I just wondered whether it was as great as some people claim.
 
Yeah really. Sounds like you've never even driven one with a map, believe me it's considerably faster and you would never want to go back.

Nobody disputes that a mapped one is really quick but the stock car is very quick too, given the type of car it is. They are not mild.
 
Did you read the OP? :p I'm not considering it, I just wondered whether it was as great as some people claim.

I did read the OP, but obviously took it to meaning you were considering it at least, rather than just pondering it. None the less, speaking to someone who actually knows about them will give more accurate information than listening to some people assumptions.

Here is an article from Auto Express, where they speak to a head guy at Superchips: http://www.autoexpress.co.uk/car-news/59931/engine-remapping-and-car-chipping-does-it-work

Are there any downsides to getting your car 'chipped'?
Some people are concerned that engine remapping could cause problems with their car. But it shouldn’t affect reliability if you use a reputable company such as Superchips.

Its technical director Jamie Turvey told us: “Remapping does put extra strain on an engine, but not a dangerous amount. We check carefully that the temperatures and pressures our remaps put the engine through don’t exceed the acceptable parameters.”

He added that most cars’ engines are built to offer more performance than they actually deliver. “You find manufacturers launch a car with a set power figure, but then over the life of the model they’ll introduce a few facelifts and performance versions,” he explained.

“They don’t develop new engines for each new version: mostly they limit the performance of the earlier models and then offer a little more power with each new edition. We just release the optimum performance.”
 
Nobody disputes that a mapped one is really quick but the stock car is very quick too, given the type of car it is. They are not mild.

I think he meant they run a mild map, hence why there is so much more potential to get out of them from even a simple stage 1 map. Pretty sure with your infinite wisdom you knew this too.
 
Now that my VW GTD is 3 yrs old, turned 3 last week. I'm looking at putting a remap on it, which should get 225bhp from 185 stock but the torque is what really increases about 100nm more of torque. Of course with being diesel, it's all about the torque rather than outright bhp.

Been reading around and one guy off the VW forums had his done a few mths back. Posts every so often about how he is getting on with it. Said that at 60mph when he puts his foot down, he gets a bit of wheel spin which may or may not be a good thing lol.

Not sure if I'll get the box or do it properly.
 
Agree with above. You should really opt for a proper remap if you can. As it actually changes block values and such, rather than simply tricking the ECU into putting in more air / fuel. Have a look at well regarded tuners for your specific car. Revo are quite good for a generic map, well researched, well used, and decent support in place. Superchips too.
 
Yes I'm looking at more of a proper remap rather than a plug in box.

Have had a look at revo, superchips and a few others. Looking at around £400-500 for a remap.
 
I know of a guy who's now done 200,000 miles on a remapped vehicle, it's returning improved mpg (up by 1) and considerably more power (730 to 850bhp) it's a 16litre V8 diesel which arguably is very over engineered to start with, he uses it predominantly to pull machinery to and from Ireland and has had no issues with regards to warranty claims (a wheel bearing and failed air con compressor) despite it being dealer serviced they've not said a word to him about its remapped engine even though its apparent from driving it it's got considerably more grunt than standard.

He had his previous R620 remapped to 700bhp without issues either, ironically though, his personal car (a 335d) he's left standard as he's not convinced the engine is built for the considerable hike some remaps offer.....
 
CO2 is basically proportional to fuel burnt though...

Correct, however fuel burnt doesn't have stupid bandings. People won't think twice between a car that does 47mpg and one that does 48mpg.

150g/km compared with 151g/km will cost you an extra £300 for the first year.
 
Yeah really. Sounds like you've never even driven one with a map, believe me it's considerably faster and you would never want to go back.

I have literally just got back from a drive with a Cayman GTS and an M2. It doesn't need more power than stock to keep up apart from on really technical winding routes where extra BHP would make no difference anyway given the limitations of the chassis.

I'm not disagreeing with you that if I got a map I'd love it etc but describing the stock car as mild is just ridiculous.

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Correct, however fuel burnt doesn't have stupid bandings. People won't think twice between a car that does 47mpg and one that does 48mpg.

150g/km compared with 151g/km will cost you an extra £300 for the first year.

But you said a remap could give better mpg but higher CO2?
 
But you said a remap could give better mpg but higher CO2?

My point was about why a manufacturer wouldn't sell a car with the highest possible safe bhp output from factory - they will have to consider the CO2 figures. When remapping a car the owner won't care about the CO2 as it won't impact the banding. Any remap I've had in the past has resulted in slightly worse MPG, but that's because you tend to use the extra power.
 
I found on my MK5 GTI I had to get an anti lift kit (whiteline and superpro seem to be the popular ones), to make the power usable without the front lifting, it was much more planted with that.
 
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