question about mapecu and single

[ksbkrew]

Hello,

i've got a littlle question concerning the setup of my mapecu

 

i've got a single UK mk4, i've put some 850cc injectors on it with fuel rail and frp and an aeromotive fuel pump.

 

I remove the maf and installed a map ecu 1

 

i have done the fuel map using the map base of 850cc and ajust it to match my setup.

In high boost (1.6bars ) and rpm , i've got a good 11.1-11.2 of afr

 

My problem is more at idle and low rpm.

in fact when i roll and stay at 2000rpm by example , i've got a good afr of 14.7-15 and the car is running perfect.

But if i remove my right feet of the accel pedal, the afr doesnt became poor, it becames rich (11 or 12 of afr) and after that if i want to accelerate slowly, the car hesitates and became poor for 1 or 2 seconds and after all goes normal

 

What can be the problem?

 

thanks a lot

[mellonman]

your best off asking on the supraforums.com as mapping and ecu's are very hush hush in the u.k.(its like the magicians code). or is there even a mapecu forum or web site?

[bignum]

your best off asking on the supraforums.com as mapping and ecu's are very hush hush in the u.k.(its like the magicians code). or is there even a mapecu forum or web site?

 

Its kind of like that anywhere tbh, also the people that do know what they are doing arent going to give much away are they, if someone dishes out advice and they get it wrong it could be bye bye engine tricky subject really.

[Tricky-Ricky]

Could be a couple of things, the MAP1 ECU is a piggyback, and not all that, MAP2 is better, so it could be that its not too clever at controlling bigger injectors at low duty cycle,

Or it could be a simple case of the TPS is not set up correctly, do the AFRs go to 20.9 when you completely lift off the throttle?

[ksbkrew]

the TPS were set up with the procedure given by the notice of the mapecu , with the engine off and ignition on so i think they are setup correctly.

When i lift the throttle, it doesn't go to 20.9, it goes more to 12, like the injectors continue to spray fuel.

[Tricky-Ricky]

Thats why i also wondered if the MAP is not able to handle larger injectors, has it got lag adjustment? if so you could try playing with the setting, if your happy that the ECU is seeing the expected voltage at closed throttle, the injector handling is the only other thing that would account for it, i presume that before you added the injectors and the ECU all was OK?

 

Is all OK on part throttle/cruse IE closed loop?

[ksbkrew]

all is ok on closed loop

and before passing on large injectors all was ok!

[Tricky-Ricky]

I think you may have your answer then, like i said try changing the injector lag time.

[ksbkrew]

it's not possible to change the lag time with the mapecu i think

[Tricky-Ricky]

Unfortunately its often the case with piggybacks that they are are not very good a controlling larger injectors, or handle lag very well, found similar with the Greddy EMU, even though it could adjust for lag it just wasn't very good at it.

[ksbkrew]

and could it damage my engine?

[Tricky-Ricky]

If your getting consistent AFRs throughout the RPM/load range and no high EGTs, and its only momentarily going rich when rolling back on the throttle, apart from possibly fouling the plugs, and causing slightly bad fuel consumption, and some nice pops and flames on lift off, i cant see it causing any real damage, but not ideal obviously.

 

Does it idle OK?

[ksbkrew]

the idle is good,

In the high rpm i've got a good afr of 11-11.2 and throughout the rpm range i don' t see any probleme.

In fact as soon as i get in open loop, i don't have any problem