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Performance Unlimited.
They can perform remap (Pete's) for most unlocked ECUs there and then. My Jetta's ECU unfortunately was locked, so they had to take the ECU out and ship it to Kochi. Took about a week to get the car back.

Their address has changed from Pedder Road to Worli though. They are located here now:

73A Kundanmal Service
Gandhinagar Industrial Estate
Haines Road
Worli
Mumbai - 18

Shipping the ECU is a risk i feel, I will give them a visit once i get time and see what they have to say. Is the dealer's name "performance unlimited", if yes then I had a chat earlier and he said we need to ship the ECU to kochi and we are looking at a week's time. He said power bump to 25hp and 50NM torque increase.

Yup, The same guy, Surely a risk but apparently they have been doing it since quite some time now, However call up petes kochi and ask if Vinu would be coming down to mumbai anytime soon, If he is coming down he can get your car done in a matter of a few hours.

Though many people talk about maps etc. what many people (including so called tuners) don't know is "Variant coding". Because manufacturers mostly use the same powertrain in different combinations, most often they have for this either a parameter or a characteristic line. This means, just by changing this one parameter, you could get different outputs at the wheel.

For example, the manufacturer I work for, just by changing the variant coding of 1 parameter, I can get following outputs.

Option 1 : Parameter = 0 --> 200kW
Option 2 : Parameter = 1 --> 245kW
Option 3 : Parameter = 2 --> 270kW
Option 4 : Parameter = 3 --> 320kW

No maps, no "optimization", no free flow, no headers, no tuning, nothing. But one needs to know what that parameter is.;)

Spike:D

True. Happens with VW's 2.0 TDI which has several states of tune - 110 Bhp / 140 Bhp / 150Bhp / 170 BHP and 190 Bhp.

Most of their engines including petrols have varying states of tune.

I'm sure apart from ECM coding, tyre sizes and gearing play an important part as well

One parameter changes the output by that much? That’s quite remarkable! Are you sure this parameter actually changes the output or is it a parameter that needs to be set to indicate a certain output in the first place? (i.e you set this parameter based on the output of the respective engine?)

To be honest, I find it very hard to believe that engines and powertrains would be over dimensioned by this much. We have an other thread where the over dimensioning of engines was discussed. It’s not unusual to be able to get 20-30% out of the same engine with no changes other than a simple parameter change. I’ve never heard of anything this much. What you are saying is that manufacturers put a car/engine on the market that can deliver 60% more output just by a parameter change? That means all the models that don’t have this parameter set to 3 are hugely over dimensioned.

could you share some more details on this. What model, what parameter etc?
Thanks.
Jeroen (as usual very sceptical about what he doesn’t understand/experienced before)

It should be very easy for the manufacturer to do it. It might be just variant coding or single parameter change for the manufacturer. But that single change should be affecting couple of maps.

I have seen same maps getting repeated several times in ECU. But the values won't be the same. Few of these maps are not even considered by the ECU for performance. I believe there are many such maps and the manufacturer can just switch the maps by this coding. You are absolutely right that most of the tuners have no knowledge about coding and stuff. All they do is find some maps and increase it by some percentage most of the times.

Yes, see reply from Dr.Naren, he has answered it pretty much.

Sorry, those details I cannot share on the forum, the next time you are around Stuttgart, on a weekday, I could show you a live demo.

Yes, it's a chain of events.

Spike

While I share Jeroen's scepticism, I guess you're the expert ! :thumbs up

Could you at least state if it's a gasoline or diesel engine, & whether it's NA or turbo ?

If it was a gasoline NA engine, I would, frankly, be flabbergasted ! :Shockked:

Perhaps a lame question, why doesn't someone simply replace that variant coding say at a dealership or how hard will it be for someone to replace ECU from a higher output engine variant to a lower? I believe it will still be cheaper than then cost difference manufacturers charge for higher output models. And are you absolutely sure there is no change in Internals like pistons or crank? I remember discussions somewhere, 320i and 328i have very different internal components.

No he hasn’t. He just says:

I know that. I’m doubting how much power increase you can get from the same engine/tranny with a a single parameter change. Or with a complete unique remap for that matter.

Do you have a dyno available?

Jeroen

I too find it hard to believe that such a huge change can happen from just variant coding, without any internal changes. I know that the 328i and the 320i engines are the same, except for the pistons due to which the compression ratio is also different. Even for BMWs which use the basic N57 engine in the 258, 313 and 380bhp tunes there are a single, twin and tri turbos respectively.

Agree. Yes there are ECU's that store multiple maps. A single parameter allows you to choose which map. Nothing new about this.

I still think this is a case where the ECU is used for multiple (different)versions of an engine. You choose the parameter for the respective engine version. Different engines with different output require a different ECU paramter setting.

Jeroen

MB OM 501 engines are available at different tunes from 310-460 HP. Not much mechanical difference and even the ECU (MR) is same. It's a 12L v6 truck engine.