Remapped my Zed

[R.E92]

It's not as simple as "limit boost to 12PSI in normal mode", you have to change the torque request table so it only ever requests 70% (for example) torque.

Personally I just avoid going full tilt when I know there's 91 octane fuel in the car. Doing a quick 18PSI splurge for an overtake isn't that bad. But you may notice serious timing corrections if you do a sustained WOT pull through several gears on low grade fuel.

 

[stuartinzg]

Understood. I just love the idea of different power in different modes, like the older m5

 

[techathy]

Yeah, also gives you a better understanding of what’s going on with the car.

Actually the smoother idle & reduction in surging was a side effect of making the car a little richer than stock, it was just running too lean for my liking at low loads.

I used a free map as a base for the basic roughing out but then tailored the map to my car. I did have a few “SERIOUSLY?” moments when looking at the AFR in the logs. The way I used to map my car was make a big change, have a RR session to get it close then go out on the road/track & polish the mapping.

The one problem I had with the multiple modes issue was I wanted to adjust the spark & fuel tables for the low quality option but couldn't see a way of doing that. All I could do was down the torque target.

 

[R.E92]

I think the only true way of having adjustable on-the-fly ignition and fuel tables would be using the Syvecs standalone unit.

There was a piggyback unit called Procede which was a Haltech EMS system. It could change ignition timing and probably could do fuelling changes too. The JB4 was just a cheap copy of the Procede but gained traction due to its low price and pro-active support.

 

[techathy]

Which confirms what I thought. The last ECU I used stored completely independent maps which you could select arbitrarily.

 

[goldbcfc]

Can everyone stop talking about this please... Given my bad experience and a firm promise to myself I'd not try this again, all this talk is too tempting!

there's only a few tuners id let touch my bmw's these days Evolve or Bw chiptune and modern mapping with many years of good reputation

 

[stuartinzg]

I think the only true way of having adjustable on-the-fly ignition and fuel tables would be using the Syvecs standalone unit.

There was a piggyback unit called Procede which was a Haltech EMS system. It could change ignition timing and probably could do fuelling changes too. The JB4 was just a cheap copy of the Procede but gained traction due to its low price and pro-active support.

Bum. Kind of pointless just to restrict torque settings then? or good enough to stop potential damage on low quality fuel?

 

[techathy]

I think the only true way of having adjustable on-the-fly ignition and fuel tables would be using the Syvecs standalone unit.

There was a piggyback unit called Procede which was a Haltech EMS system. It could change ignition timing and probably could do fuelling changes too. The JB4 was just a cheap copy of the Procede but gained traction due to its low price and pro-active support.

Bum. Kind of pointless just to restrict torque settings then? or good enough to stop potential damage on low quality fuel?

No because it restricts boost & the lowering the boost levels removes a lot of the detonation issues. The thing is that if you're running fueling and spark tables for 98RON on 95RON you need to drop the boost more, thus lose more power, than if you mapped for 95RON.

For example, when I swapped the ECU in my Fiat for one with multiple maps I could actually run the same boost level on 95RON & 98RON rather than having to go from 0.7 to 0.4 bar boost. This meant where I previously lost torque everywhere I was only really losing in the top half of the rev-range.

 

[stuartinzg]

I think the only true way of having adjustable on-the-fly ignition and fuel tables would be using the Syvecs standalone unit.

There was a piggyback unit called Procede which was a Haltech EMS system. It could change ignition timing and probably could do fuelling changes too. The JB4 was just a cheap copy of the Procede but gained traction due to its low price and pro-active support.

Bum. Kind of pointless just to restrict torque settings then? or good enough to stop potential damage on low quality fuel?

No because it restricts boost & the lowering the boost levels removes a lot of the detonation issues. The thing is that if you're running fueling and spark tables for 98RON on 95RON you need to drop the boost more, thus lose more power, than if you mapped for 95RON.

For example, when I swapped the ECU in my Fiat for one with multiple maps I could actually run the same boost level on 95RON & 98RON rather than having to go from 0.7 to 0.4 bar boost. This meant where I previously lost torque everywhere I was only really losing in the top half of the rev-range.

I see. I'll stick to the idea of different torque levels on the button then - thanks

Do you think it is a bit more risky mapping these DCT cars? There is a lot of debate online about the performance of the clutches (and not down to the clutch material itself, as it's the same as the M6 apparently).

 

[R.E92]

Not heard of any DCT failures in the tuning world. The only problems I've seen reported are on stock cars who obviously got a duff unit from the factory.
I've heard the DCT doesn't start slipping until 600whp and above, plenty of people abusing them at 400-450whp levels without any issues.

The initial confusion regarding the ability of the DCT to hold power came from people using piggyback units. Piggyback units fool the DME into producing more power by fudging sensors and thus cause the transmission to apply incorrect clamping pressure to the clutch packs causing slip and wrecking the transmission.

 

[stuartinzg]

Not heard of any DCT failures in the tuning world. The only problems I've seen reported are on stock cars who obviously got a duff unit from the factory.
I've heard the DCT doesn't start slipping until 600whp and above, plenty of people abusing them at 400-450whp levels without any issues.

The initial confusion regarding the ability of the DCT to hold power came from people using piggyback units. Piggyback units fool the DME into producing more power by fudging sensors and thus cause the transmission to apply incorrect clamping pressure to the clutch packs causing slip and wrecking the transmission.

Got it, thanks

 

[stuartinzg]

I've emailed him, so lets see what happens

 

[35i-Nut]

with the MHD platform , can you log air fuel ratio ? or is visiting a rolling road afterwards essential to ensure your not running lean ?

 

[stuartinzg]

with the MHD platform , can you log air fuel ratio ? or is visiting a rolling road afterwards essential to ensure your not running lean ?

It does everything. Then you dump the log into datazap and people can view all the sensors you select to log.

 

[stuartinzg]

Quick update; going to a rolling road tomorrow to a tuner who knows his stuff. Has built supercharged M5's and custom turbo installs for M3's - looking forward to meeting him and trying out his dyno. If all goes well I'll install the MHD Stage 1 default map and get him to check the vitals, then when I hear back from one of the tuners in the states look to customise the map, unless this tuner can also do it (he says he can)

He will also investigate the carbon built up and see what's going on (lumpy idle).

Catching up on the OP 8)

 

[R.E92]

You can get rid of the lumpy idle by reducing the valve overlap using VANOS changes. I've also tried targeting leaner AFRs at idle like techathy suggested and it seems to help also. Ask your tuner to make those changes and see how it feels.

If I flash back to stock the car idles a little lumpy. This is on a car that has had walnut blasting, new injectors, coils, plugs and 4 o2 sensors!

 

[bazza1]

hi,all as this is my first post hope I get it right. car is a 35i [what a car] well I have had a remap done and now it is like a rocket ship.
numbers are360 b.h.p and torque is 471 well pleased at 200 pounds.

 

[sammyz]

Bazza, where did you get it remapped?

 

[techathy]

How does the chaise handle the power?

How well does the Zed handle the power?… From a Boxster S (987 Gen II) driver “At your entry speeds there’s no answer in this [Boxster S]. It simply can’t put that much power into the road when in a corner.”

The Boxster could easily out corner the Zed but it couldn't translate that lateral grip into mid-corner accelerative traction. This just reinforces my view that BMW absolutely nailed the E89. I don't think you can buy another car that offers or exceeds the levels across luxury feel, touring ability, handling & performance that the 35iS offers at this price point.

 

[techathy]

One thing I do want to know for curiosities sake is that there seems to be 2 versions of the K+DCAN cable, one around the £30 mark with a switch above the label and the other about half that price with no switch. What is the actual difference between these cables?