STFT in open loop

levl · Post by **levl** » March 14th, 2012, 5:08 am

Not sure if someone raised this before.
European mps ecu logic allows STFT adjustments during openloop. Unfortunately once ecu reflashed with VT this is not present any more. I’m pretty sure with STFT wot correction enabled we can hit AFR targets more accurately no matter how good maf calibration is.

P.S. Looks like in mazdaspeeds (US) ecu logic they don't have STFT correction during openloop

YuraL · Post by **YuraL** » March 14th, 2012, 8:42 am

I raised in PM with Steve and Ugnius

manselainen · Post by **manselainen** » March 14th, 2012, 12:34 pm

It does some adjustment during OL though. I've changed into ethanol mix, E25-E30 or something, but actual lambda hardly changes even if MAF cal is not touched. Injector duty cycle does change, 86%->90%. Strange...

Post by **Steve @ VersaTune** » March 14th, 2012, 2:09 pm

We're looking into this.

mituc · Post by **mituc** » March 16th, 2012, 1:27 am

Would it help if someone from Europe (and eventually Australia too) would send you the stock tune backup image so that you can adjust the default tune settings in the versatuner accordingly (eventually based on the VIN)?
The Euro models are rated at 260PS/256bhp, while the US models are rated at 263bhp. Same differences for Mazdaspeed6, the US models are rated at 273bhp while the Euro models are rated at 260PS/256bhp. And you can't get 263/273bhp with crappy US gas using the same tune as the Euro models and running on better gas... so there must be some differences.

keridil · Post by **keridil** » March 16th, 2012, 1:40 am

I've mine ready if required.

levl · Post by **levl** » March 16th, 2012, 7:52 am

I think Steve will come up with some sort of explanation soon and they should have access to number of original European mps maps already. I have also feelings that some sort of system is still looking after our wot AFRs just not as strictly as on stock map...

YuraL · Post by **YuraL** » March 16th, 2012, 9:33 am

levl wrote:I have also feelings that some sort of system is still looking after our wot AFRs just not as strictly as on stock map...

Have feellings? I have actual AFR 9.xx when methanol injected with desired AFR 12.0.

keridil · Post by **keridil** » March 16th, 2012, 9:57 am

YuraL wrote:
levl wrote:I have also feelings that some sort of system is still looking after our wot AFRs just not as strictly as on stock map...
Have feellings? I have actual AFR 9.xx when methanol injected with desired AFR 12.0.

Ouch! That hurts!!!

YuraL · Post by **YuraL** » March 17th, 2012, 6:49 am

Today I have written more than 10 log files with different settings. I have the same rich mixture with and without methanol.
Sorry, Guys, I'm just a fool.

Forgot to move the maf tables.
But I still need to check all with big meth nozzle.

STFT in open loop

STFT in open loop

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