Does an ecu need time to adapt after a remap?

Nick Clarke

Nick Clarke

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Hi all,

I've had my a3 1.8T AUM remapped today at AmD in Essex. The dyno results showed an increase from 155 bhp to 189bhp. I must admit the car pulls a lot stronger now but I can't deny I was hoping to see in excess of 200 bhp?, as others have said this engine should produce with a stage 1.

Only mods are a smoothed airbox with pipercross panel filter and forge equivalent recirculating dv.

The max power is now at 5200 rpm as opposed to 6200 rpm beforehand, so could it be losing boost pressure? It had the standard spring in the dv at the time of remapping and I have now put in the yellow coloured spring.

Could it also be that the ecu needs a little time to adapt to the new remap? They asked me what fuel I use which is Tesco Momentum, and said that after a few fill ups the power should increase more. But is this true even though I was already using this fuel?

Any thoughts and suggestions welcome as always.

Nick.
 
nope, no adaptation necessary .

No need to change the spring if the old one was working.

If they mapped for 99RON then that's' what the map is set for. Had they mapped for supermarket crap, and then you put 99 in, potentially you could see a gain as the timing pull becomes less.
 
On most modern ECU's there are parameters that change in response to the engine condition and affect the running of the engine.
There are usually PID algorithms that run to control boost and timing. When you make large changes to an engine with a new map these parameters take some time to readjust to give the best result but this won't necessarily improve the power much more. I would have thought that you should have changed the spring in the DV before it was mapped.

Karl.
 
Thanks for the reply guys, so is it normal for the max bhp to come in lower in the rev range after a remap? Looking at my graph, with the new reading it tails off slowly after 5200 rpm then drops almost vertically at 700 rpm. Where as the old reading drops immediately, again almost vertically after 6200 rpm.
 
I also read somewhere that the bhp and torque figures should be very close, and they were at stock reading (155 bhp/ 159 lb/ft).
But the new torque figure is 213 lb/ft, quite a bit more than the bhp figure? Could this suggest a problem or am I reading into this too much!
 
Paul @ Unit 9 Remaps said:
Are you talking about a 150bhp model from the 8L chassis if so you never see past 200bhp
Click to expand...
Yes, It's an AUM engine which has the bigger ko3s turbo which as I understand should achieve 200 bhp or so after remap. Every tuning place I have looked at has said that the aum engine should achieve over that figure?
 
What I really wanted to know was if they were lying about the "adaptation process".
 
The ecu will not adapt to add power unless you change fuel Ron. If you are already running super unleaded and that's what map was for it won't add any more timing and therefore not add any more power. If they have mapped it and it's pulling timing it's likely to reduce timing and power. In other words it's complete horse caka that it will make power by adapting for no change to the car
 
Paul @ Unit 9 Remaps said:
Ko3s are 180 standard should see 215
Click to expand...
The later 1.8T 150 (AUM engine code) had the ko3s turbo. The AGU 1.8T 150 (pre facelift) had ko3, so would not gain as much from a remap as its a smaller turbo. I'm sure I'm correct in what I'm saying?
 
Broken Byzan said:
The ecu will not adapt to add power unless you change fuel Ron. If you are already running super unleaded and that's what map was for it won't add any more timing and therefore not add any more power. If they have mapped it and it's pulling timing it's likely to reduce timing and power. In other words it's complete horse caka that it will make power by adapting for no change to the car
Click to expand...
I understand what your saying, would of thought that AmD tuning, being a well respected and recommended remapping specialist would know better!!
 
Does the ECU run in open loop for WOT?
Just remember when I was mapping my JDM Type-R's that WOT was always Open Loop, meaning it only pulled values straight from the uploaded map and therefore timing and fuelling was set.
Closed loop for part throttle which the ECU would learn for fuelling and timing but mainly just made things a little smoother around town.
 
fonz600 said:
Does the ECU run in open loop for WOT?
Just remember when I was mapping my JDM Type-R's that WOT was always Open Loop, meaning it only pulled values straight from the uploaded map and therefore timing and fuelling was set.
Closed loop for part throttle which the ECU would learn for fuelling and timing but mainly just made things a little smoother around town.
Click to expand...
I don't know mate sorry, thanks for your input though.
 
Broken Byzan said:
Wideband cars like this remain closed loop @ WOT iirc
Click to expand...
My JDM Type-R's were wideband. UK Type-R's cars are narrowband.
Obvious different ECU's and software so may be different. When I did my old Evo MR the software was totally different as well where u set desired A/F ratios thru different rpm/throttle position ranges where as the Type-R setup was amount of fuel in units then doing data logs to find if it hit the required A/F you were looking for.
 
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