re mapping

[jwfcms]

post up your boost psi figures for the remaps. and stage 1 or stage 2.

 

[lordgibbness]

I went through this a few months back and did a LOT of research before I decided which tuner to use...

I'm a bit of a petrolhead and wanted a longer flatter torque curve with usable power right at the top of the rev range. When overtaking I used to get annoyed with the power tailing off at 6000rpm and really didn't want to bring peak power even lower down! I wanted to extend the power curve as well as increase horsepower.

I imagine that it's quite fun for a while having a big lump of torque at 3000rpm but I really wanted the feeling of a large NA petrol car as opposed to a large turbo-diesel in terms of power delivery. I don't really want to have to change gear during an overtake if possible as well.

I went with custom code in the end because of this and have been happy with the choice. If you drive at less than 50% throttle you wouldn't even know it's been mapped but put in about 80% and the revs just build and build up to 7200rpm with power at the top. I'm still having fun!

 

[dirk1978]

I went through this a few months back and did a LOT of research before I decided which tuner to use...

I'm a bit of a petrolhead and wanted a longer flatter torque curve with usable power right at the top of the rev range. When overtaking I used to get annoyed with the power tailing off at 6000rpm and really didn't want to bring peak power even lower down! I wanted to extend the power curve as well as increase horsepower.

I imagine that it's quite fun for a while having a big lump of torque at 3000rpm but I really wanted the feeling of a large NA petrol car as opposed to a large turbo-diesel in terms of power delivery. I don't really want to have to change gear during an overtake if possible as well.

I went with custom code in the end because of this and have been happy with the choice. If you drive at less than 50% throttle you wouldn't even know it's been mapped but put in about 80% and the revs just build and build up to 7200rpm with power at the top. I'm still having fun!

That's very interesting. I had assumed that with the 'whack-in-the-back' maps that they just let the boost climb as quick as the turbo wants to spool and just hold the boost to about 15 psi which is about right for the maximum duty cycle on the injectors. You get the kick when the turbo first comes in as it's not smoothed out.

With a map that gives you a flatter torque curve would it not just be that the boost is held down so you don't get a spike, but you climb to the same peak BHP eventually at the top, so in effect you're losing a bit of extra grunt you could have had from lower down?

In the map the only things that can be changed are fuel maps, boost and ignition timing. Pushing power further up the rev range can only really be accomplished by altering cam timing e.g. something like VVTi so each and every map should just be able to push 265BHP at the top while not leaning out and melting a piston.

This is my understanding anyway, please feel free to correct anything I'm wrong about.

 

[lordgibbness]

That's very interesting. I had assumed that with the 'whack-in-the-back' maps that they just let the boost climb as quick as the turbo wants to spool and just hold the boost to about 15 psi which is about right for the maximum duty cycle on the injectors. You get the kick when the turbo first comes in as it's not smoothed out.

If you examine the torque curves you will often see that the aggressive maps tail off quite quickly compared to the smoother maps. You have more power at low revs but a shorter power band.

With a map that gives you a flatter torque curve would it not just be that the boost is held down so you don't get a spike, but you climb to the same peak BHP eventually at the top, so in effect you're losing a bit of extra grunt you could have had from lower down?

With the CC map the peak torque probably won't be as high but the torque at the higher revs is usually much higher. Since power is effectively torque x revs (divided by a constant) the power outputs of the maps are usually the same.

In the map the only things that can be changed are fuel maps, boost and ignition timing. Pushing power further up the rev range can only really be accomplished by altering cam timing e.g. something like VVTi so each and every map should just be able to push 265BHP at the top while not leaning out and melting a piston.

This is my understanding anyway, please feel free to correct anything I'm wrong about.

As I say above, as power is just the result of torque x revs if you have more torque at higher revs the power will be higher at those revs. The reason for variable cams in a NA engine is to get more air into the engine. In our cars the turbo really is what defines this.

So to conclude, both types of maps will give very similar power results, with the aggressive maps having more torque at lower revs and the smoother maps having more torque at higher revs creating a longer power band.

 

[JamJay]

Ok, we just got AMD'd (their own map) on a 210.

BHP: 250
Torque: 299lb/ft

The car previous to the map was fit and well, actually making a little over its factory claimed 210bhp --> 210.9bhp. Based on that, we didn't expect bhp to exceed 260 but the torque this thing has is phenominal

 

[D.K]

That torque figure is very good, It should addapt over the next few days and feel even stronger.

 

[JamJay]

It's hard to imagine it getting any better than it already is ...can't wait.