[CobraMarty]

IDK about PLX sensors not being fast enough. Bad design, electronics, sensor or gauge. Slow response time is just unacceptable. I don't use PLX products.

I have used the Intercooler Dual Temp Gauge from Silicone Intakes and it is very fast updating and response time and displaying. It shows as near real time values as I can tell.

[rhombus]

Originally Posted by CobraMarty

IDK about PLX sensors not being fast enough. Bad design, electronics, sensor or gauge. Slow response time is just unacceptable. I don't use PLX products.

I have used the Intercooler Dual Temp Gauge from Silicone Intakes and it is very fast updating and response time and displaying. It shows as near real time values as I can tell.

Any resistive temperature sensor has a delay in response. The sensor element can not change to the air temp in real time. It takes time for brass (or whatever the sensor element is made of) to adjust temps. This is not a PLX issue, its a temp sensor element issue.

I spec sensors for industrial and commercial applications, so I have a good bit of background on sensor response profiles.

[CobraMarty]

So the lag time/ slow response reading on the gauge will be lower then actual temperature.

[rhombus]

Originally Posted by CobraMarty

So the lag time/ slow response reading on the gauge will be lower then actual temperature.

Yes, but it will be more of an average temp over the response time than an instantaneous temp. So the cooler temps at lower rpms/boost will be higher and the high rpm/boost will be lower. Doing top gear pulls can give the sensor enough time to adjust to real temps, but anything at normal speeds will be an average temp during the pull.

[94marcus]

so is this kit working 100% now? like figment and everything is on point when ordering?

[vha27]

Kit is 100% working both VT1 and VT1+ kit with stock headers. The problem is using aftermarket headers where not enough fuel is being delivered causing leaning issues.

[rhombus]

Originally Posted by vha27

Kit is 100% working both VT1 and VT1+ kit with stock headers. The problem is using aftermarket headers where not enough fuel is being delivered causing leaning issues.

Actually, I was told by ESS's tuner that the issue with aftermarket headers is not the amount of fuel but that the header design is causing issues with the adaptations. They said that they have had similar issues on the Z4M S54 (which uses the MSS70) and supersprint stepped headers. It seems that the key will be header design.

[hassmaschine]

that stuff can be tuned.. but it wouldn't be fun. How about just turning off adaptations all together? short term trims should work fine. Long term trims mostly suck anyway..

[dahaker]

Originally Posted by rhombus

Actually, I was told by ESS's tuner that the issue with aftermarket headers is not the amount of fuel but that the header design is causing issues with the adaptations. They said that they have had similar issues on the Z4M S54 (which uses the MSS70) and supersprint stepped headers. It seems that the key will be header design.

Would going catless with stock headers create the same issue? I'm debating on whether to do this on my VT1 325 or not.

[vha27]

For all those who have installed the kit. Just got the modified file. I was told by Asjborn to disconnect wire 5 (yellow wire) from the MAF. Do I just unpin this wire from the sensor plug and leave it hanging?

Also just referenced my Bentley manual. According to the manual, for MAF (from 03/2007) the yellow wire is pinout #1

Can anyone clarify?

[CobraMarty]

I always wondered about this sensor.
Is it a MAF or is it a inlet air temp sensor? I have seen it called both.
It could be both in one sensor.

How many wires does it have total?

[rhombus]

Originally Posted by vha27

For all those who have installed the kit. Just got the modified file. I was told by Asjborn to disconnect wire 5 (yellow wire) from the MAF. Do I just unpin this wire from the sensor plug and leave it hanging?

Also just referenced my Bentley manual. According to the manual, for MAF (from 03/2007) the yellow wire is pinout #1

Can anyone clarify?

Cut the wire and tape it off. This is the MAF signal wire. The tune is an Alpha-N (MAF-less) tune. The other wires in the MAF are for the intake temp sensor, those are still used.

[CobraMarty]

So it doesn't use the MAF signal for anything?
If you cut it, the maf doesn't do anything and it runs fine?
If you leave it, the maf is connected and it runs well?

So what does it do or don't do?

[rhombus]

Originally Posted by CobraMarty

So it doesn't use the MAF signal for anything?
If you cut it, the maf doesn't do anything and it runs fine?
If you leave it, the maf is connected and it runs well?

So what does it do or don't do?

For the Alpha-N tune, the MAF signal wire must be cut. The car runs without using any MAF input. Alpha-N is a method of tuning without a MAF.

[CobraMarty]

Yeah I know what Alpha-N is, so is that what the 328's use for a tuning strategy?

Does the stock N52 328 use MAF tuning or does it use Alpha-N?
If it uses MAF, does ESS reflash the DME to Alpha-N? That doesn't sound right.

Because there is NO vacuum in the N52 328, it makes sense that the factory uses the Alpha-N strategy for tuning with the wide bands also controlling the AFR.

?Maybe the MAF if it is truely present in the sensor(I have my doubts), is only to watch and make sure things stay in parameters. I don't understand why there is no CEL for cutting the MAF signal wire. That sounds so un-BMW.

I need to go and check the stock sensor. I might be getting the stock, euro and N54 sensor confused.
I need a stock sensor to pull apart.

[rhombus]

Originally Posted by CobraMarty

Yeah I know what Alpha-N is, so is that what the 328's use for a tuning strategy?

Does the stock N52 328 use MAF tuning or does it use Alpha-N?
If it uses MAF, does ESS reflash the DME to Alpha-N? That doesn't sound right.

Because there is NO vacuum in the N52 328, it makes sense that the factory uses the Alpha-N strategy for tuning with the wide bands also controlling the AFR.

?Maybe the MAF if it is truely present in the sensor(I have my doubts), is only to watch and make sure things stay in parameters. I don't understand why there is no CEL for cutting the MAF signal wire. That sounds so un-BMW.

I need to go and check the stock sensor. I might be getting the stock, euro and N54 sensor confused.
I need a stock sensor to pull apart.

Stock, the DME uses the MAF. ESS has a Alpha-N calibration file that it uses for the SC kit. We switched to Alpha-N during development because the MAF was reading turbulence and was causing wild swings in timing (single digits) and thus had big swings in power. I have been running the Alpha-N map on my car for about 13K mi. The first 2k was on a MAF tune.

[hassmaschine]

the N52 was originally designed without a MAF. I suspect they added it for emissions reasons.

[CobraMarty]

You know what I think the problem here is-

You have a '06 E91 325 (2.5L) N52B25 xi 6MT
and I have a '07 E92 328 (3.0L) N52n/N52B30 xi 6MT

'06 to '07 is a transition year.
Do these 2 engines have different MAF vs Alpha-N ecu?

Which car/engine did ESS 'blow up'?
the N52B25 powered 325 or the N52B30 powered 328?

[hassmaschine]

They are different DMEs but they are really the same control schemes. All they really changed was the CPU. Borh have a MAF.

[CobraMarty]

EAS is in CA
Rhombus is in VA, tuned by EAS in CA
ESS is based out of Norway with an AZ US distributor
We are in PA

Is that correct?
We all could have different engines? N51B30 SULEV, N52B25, N52B30

[CobraMarty]

Originally Posted by rhombus

Stock, the DME uses the MAF. ESS has a Alpha-N calibration file that it uses for the SC kit. We switched to Alpha-N during development because the MAF was reading turbulence and was causing wild swings in timing (single digits) and thus had big swings in power. I have been running the Alpha-N map on my car for about 13K mi. The first 2k was on a MAF tune.

Is your MAF on the charge side of the SC or on the inlet side of the SC?

Where did ESS get the Alpha-N map? Another model BMW?

[hassmaschine]

They made it. All they have to do is turn off the error code, it will default to alpha-n with no MAF signal.