You Went From Maf To Map ..

[rtune]

I've done a search and seen it said that MAP loses some transient throttle response .. aka .. driveability.

Has anyone experienced the before and after and can state clearly what it took away, if anything?

[bloodzkull]

i did the change. also went from a pfc to a wolf v500, with a much more in depth tune so i can't really coment on possible response loss, as i actually gained a lot of throttle response.

only ill effect i noticed was a small increase in the amount of times the car cranked over before it started. like maybe half a second.

[IDO 11S R32]

Im running a PFC dejetro, no problems at all, runs well, good throttle response, never stalls and makes great power

[maximajim]

There are many automakers who use MAP based systems with no problems at all, so why would you have problems with a map based standalone? If there were problems you can probably chalk it up to bad tuning or just a poorly designed standalone. I have zero problems with my standalone map based system even though I have a 5bar map sensor. Cold start, Drive-ability, Closed loop wide band Cruise, and deceleration are perfect.

Edited March 29, 2009 by maximajim

[Rezlo]

I went from ECR33 PFC L-jetro and converted it to run the GTR's D-jetro, Being that I mapped both setup's I can say this, the D-jetro was much easier to get nice dead stable AFR's, Drivability is better and fuel consumption is up by .5L better per 100km. (this was with no other mods done at all besides ECU change, I use FCedit, dual widebands, EGT and dual knocklinks when mapping RB's)

Best thing, no idle mess around! car just runs better all round. D-jetro's idle stabilization by timing is fantasic as well! almost as good as VEMS's

[rtune]

so far then .. it sounds all good.

I wasn't told map has any "problems" but that it isn't a good choice if you plan

to do mountain driving, as altitude (or big temp changes) muck with the tune vs maf.

My tuner says map will "feel different" in a possibly negative way, he didn't elaborate.

And people on sau have posted before that map is 'for race cars' and maf is for street,

and someone else on sau said map didn't work as well with multiple throttle bodies.

So I figured I'd ask if people had experienced a car before vs after with as much else

the same.

Edited March 29, 2009 by moneypit

[maximajim]

I would say buy a ecu based on his recommendation or find another tuner who is competent in tuning a map system.

He should know that a good standalone will have temp and barometric trims (if needed).

[rtune]

I would say buy a ecu based on his recommendation or find another tuner who is competent in tuning a map system.

He should know that a good standalone will have temp and barometric trims (if needed).

He recommended going map, ecu is hks f-con,

but he just said it will feel different, and indicated I might not prefer it.

[Strik3r]

MAP sensor here too. Given the choice, i'll always go MAP over AFM. The number of AFM related issues that seem to pop up all the time is crazy. I went through 3 AFMs on my old car, and it still never was quite right.

[N1GTR]

MAP sensor here too. Given the choice, i'll always go MAP over AFM. The number of AFM related issues that seem to pop up all the time is crazy. I went through 3 AFMs on my old car, and it still never was quite right.

100% agree

MAP user here

[MBS206]

so far then .. it sounds all good.

I wasn't told map has any "problems" but that it isn't a good choice if you plan

to do mountain driving, as altitude (or big temp changes) muck with the tune vs maf.

My tuner says map will "feel different" in a possibly negative way, he didn't elaborate.

And people on sau have posted before that map is 'for race cars' and maf is for street,

and someone else on sau said map didn't work as well with multiple throttle bodies.

So I figured I'd ask if people had experienced a car before vs after with as much else

the same.

The issue with multi throttle bodies and MAP, is the turbulunce.

You can get the same MAP reading, for a different throttle reading, and it plays havoc.

Good ECU's, like the Adaptronic, Motec, (I also believe Haltech, ViPEC and Autronic) run MAP vs TPS tuning.

I run MAP with the Adaptronic, and it has no issues at all.

Actually, it has quite a few benefits... I can run NO BOV, and not have a single issue.

I run an oil coated air filter, and not have it flood my AFM giving shit readings, resulting in poor idle...

[Crans]

Ford XR6 Turbo runs map and no issues there. So the whole map = race car is a little off.

[PM-R33]

+1 For MAP.

As said above, takes a little longer to crank over and cold start some times hunts for a little bit. Nothing big.

[N1GTR]

Yeah mine doesnt take long to crank, and doesnt hunt on cold start. It does everything "normally" compared to an AFM based ECU.

....Well, except for having dramas when the AFM's get dirty and play up

[MBS206]

Ford XR6 Turbo runs map and no issues there. So the whole map = race car is a little off.

The 1JZ and I believe 2JZ also run MAP...

Lots of manufacturers cars run MAP from the factory

My car takes a couple of cranks to fire, but that is purely the ECU, and NOTHING to do with it being MAP based.

[R31Nismoid]

I went through 3 AFMs on my old car

Brand new each time or 2nd hand? I'd be interested to hear the reasons why 3 brand new AFM's would have died in a short period.

If 2nd hand, then well... thats pretty much a pointless statement

Every AFM that i put in (new) works/worked fine without issue.

Ive played around with 2nd handies lately (due to time constraint) and had nothing but problems, but i accept that because im playing around with used parts and not brand new ones.

That said - go with what the tuner reccomends. He is tuning it afterall...

[paulr33]

MAP vs TPS is pointless

guess what TPS is when you floor it?

%100 and never changes

much like manifold pressure when your reach full boost

so you go back to 1 dimensional tuning, the RPM axis

[Russco]

Straight MAP was poor on light throttle compared to AFMs but I had multiple throttle bodies (RB26). Redid the tune with MAP over TPS (combination of the 2) and found driveability every bit as equal as stock AFMs.

Best point => if I blow a cooler pipe/vacumm hose at the drags I can drive it home as is... unlike AFMs which would instantly foul the plugs. Best move I ever made was getting rid of the AFMs.

[R33S2]

I went for a MAP because my tuner prefers it, he put it this way to me, although the AFM is a good bit of gear he has had more problems with that one piece of equipment than any other but finding out it is the AFM to be the problem is the real reason he prefers the MAP sensor, as for driveabilty I didnt really notice anything except the power increase.