Andy Stevens

Is the MAF calibration exposed with the Ecutek MY99/00 software? Would fitting a more robust MAF be a possibility?

New_scooby_04

iTrader: (4)

Yes, the maf can be rescaled with Ecutek and no, I'm afriad you're either stuck with the fragile maf, or you drop it and go for a map based ECU like Simtek, AFAIK

Alan Jeffery

Hey Daz, is that FOR him or TO him?
Maybe that's where I'm going wrong!
I said he was Affable...

Andy.F

Yes MAF scaling is accessible Andy, so it is possible to fit a different maf and rescale to suit as you would do on the 92-96 ECU for example when you run out of load scale.
I used to run with a 95 maf sensor element cut out of an original 95wrx maf and located in a 100mm bore tube on my (my99) race car before I went with a mafsim unit. As long as you have a 0-5v signal anything is configurable.

The 95 maf element (which is pretty bombproof) in a 100mm bore tube will read up to 800bhp before maxing out !

Andy

Jolly Green Monster

iTrader: (4)

or the q45 bolts straight in and scaling is similar but they are not cheap unless yoiu get lucky on ebay

New_scooby_04

iTrader: (4)

Grrr I was told you were stuck with the crappy MY99 one.

Thanks for the info Andy!

Andy.F

It can be more hassle than its worth to change it to be honest, the OE 99/00 MAF has a different inlet and outlet to the earler or later versions so a custom housing and/or fittings is required, then the time factor rescaling it via the early Ecutek interface is very time consuming, hence most mappers go with Apexi or Simtek or some other mafless after a certain power level.

Jolly Green Monster

iTrader: (4)

fitted 99 simtek today to an sti type r... far less hassle and car drove very smooth etc..

agree on 99 ecutek time consuming to sort on different maf..

Simon

Scott.T@PolarPerformance

Me thinks I need to look into Simtek.
Can anyone send me spec's as to what MY it supports and what features it has.
May try and roll one out next time I get an MY97/98 enquiry or even sling one in my MY00 to familiarise.

tiny gsy

I`ve got one on my MY97, think its nearly every MY covered now

Jolly Green Monster

iTrader: (4)

on the drive by wire left to sort I believe.

Simon

Andy Stevens

I can sort the MAF end out but does early ecutek not just have library MAF files to load in like on my stuff or do you move the points around manually? Is there a MAfscale factor like my stuff as well? My experience of speed density systems so far (Link and GEMS) is ropey idle and poor part throttle resolution which isn't what I need when mid corner during a race or sprint. I suppose I could stick with the original MAF and be as kind as possible to it.

Power wise its a forged 2.0 with your 20G on it Andy, intending to run on decent MOGAS and NF OB.

MartynJ

The SimTek has none of the problems experienced with other MAP based systems...
As all the dealers will probably testify to , the part throttle is very smooth and idle is very good...
They are looking at making it closed loop so you can just input target figures with coolant based compensations etc....

ZEN Performance

I don't experience any problems with the other map based system I usually map. I am sure the Simtek is very nice, but then are the more recent versions of Motec, and Link systems, and I've never had any problems with an Autronic. GEMS, well, there is always an exception that proves the rule!

Andy.F

As Paul mentions Andy, most of the current breed of Simtek, Autronic, Motec and later Link ECU's have possibly even better transients than a maf based system, particularly if you have a FMIC storing a lot of air and confusing the airflow signal.

Even the early 99/00 Ecutek has full 64 point user configurable maf scaling available, it is however not all plain sailing as there are certain flow and load limits that make it a bit more awkward.

andythejock01wrx

Is there a web based translater that I can use for this thead ?

Jolly Green Monster

iTrader: (4)

may have to get a customer to comment on this thread as he was mapped up on ecutek with fmic and decat and filter and boost controller and wanted a Simtek fitted, which I mapped and we left the boost the same using the boost controller.. so no mods from ecutek to simtek.

That may help with the original posted question?

Simon

Alan Jeffery

Keeping it simple...

MAF sensor
Engine blown if duff.- it goes weak
You can't get home if intercooler pipe falls off.
Dodgy with dump valves.

MAP sensor
Engine ok if duff. - it goes rich
You can get home if intercooler pipe falls off.
Dump it Son, it's cool.

Alan Jeffery

Good plan Simon! every one we've done so far has had other mods going on.
We think it's more about the journey than the destination, but it's a joy to work with, and that has to pay dividends, apart from the more or less obvious benefits.

Tidgy

just out of interest y bother with the simtek if it was boost controlled etc anyway?

Brit_in_Japan

Please do Simon, although my plans are more conservative.

Tx, BIJ

Andy Stevens

Thanks Andy, that curve looks familiar. Do you keep library files of various MAFs or just recal the points manually?

Paul; the Link I had was a 6 row so I expect the G3 is alot nicer. Have a GEMs on this new bus and it'll be going on my management ASAP.

My old wrx seemed to drive quite nicely on a MAF and FMIC, though I did see a small rich spike on a full throttle application. Could introduce a delay to remove that but it didn't seem to affect driveability. Is there the possibility of reversion in the inlet if using a recirc DV maybe?

How do you cope with ambient temperature variations on a MAP based system? I'm guessing an inlet temp sensor but is that a cost option on the various MAP based systems?

ZEN Performance

Blow through maf sensor achieves all the a MAP based system does, and isn't affected by temperature irregularitys that may not be accounted for in mapping.

Speed density is good, but can be annoying, and ultimately is only as good as the mapper.

MartynJ

Isn't this true with all systems Paul....?

Fai17

iTrader: (2)

Cool read..

STiFreak

iTrader: (4)

Andy, in the pic, where the sensor max's out at 300g/sec, does that limit performance at the top?

dynamix

iTrader: (3)

Yes.

Although there are ways around it.

It means re-jigging all load related tables

ZEN Performance

The OE ECU with an OE like setup is relatively straightforward when compared to getting a great all round map that goes, starts, idles, boosts and runs well in all weathers. But once you put a bigger turbo on, big injectors with odd lag times, frontmounts and weird induction kits, the OE ECU becomes clumbersome in the company of a good aftermarket item.

If you are used to flashing an OE ECU and someone gives you a univeral ECU where you're defining even the trigger patterns, then it's a whole new ball game. The simtek fits in between very nicely by the looks of things.

Jolly Green Monster

iTrader: (4)

kept doing maf's..

Simon

Andy Stevens

Its done that way to give you better vertical resolution over the range the car is likely to use. You can extend the exponential curve if you start to explore greater flow rates. There are two unused points on the end of the pre 97 green 160 MAF that we use to stretch the MAF to its limit. As you can see though, the gradient is so steep at the top end that small changes of voltage equate to large changes of airflow, so its accuracy is diminished and can lead to a noisy load figure when you approach saturation.