Hi,

for my next project i need two solenoids switched.

The first one by rpm:
Need two witching points one for rising one for falling.


The second by speed and load as 3d map.

i would like to use the egr and fpr solennoid, because the are not connected in my car. But i haven't found out anything about this two solenoids.

does someone diassembled some code about them?

I think i can figure out the map stuff, there are enough examples in the code.

Is there any suggestion for a hook point for my own routine?

thx Jan

 

I forgot: Infos for any rom, i can transfer it to my current rom.

 

Using the FPR solenoid line to switch on the second pump in a double pumper setup would be great . I've been quietly pushing for this for months, but only quietly since I can't do much more than test

 

Could you already use the relay that switches pump voltage for this purpose already?

 

I can't find any of the solenoids. I even don't know where to look. Has anybody found a ram adress or a routine?
Or a mut adress?

Just one hint, is all i need.

 

EGR duty is MUT85. The first occurence in your ROM of the 2-byte RAM addy should be be where the duty cycle is set. In my ROM, its sub_CBDE. Might be the same for yours. I've never bothered to find the FPR solenoid, but the duty cycle conversion for that solenoid ought to be in the same subroutine as for the EGR solenoid.

 

Thanks, with that i can start to work.

EGR is really a PWM Signal? I thought it was a simple on/off solenoid.

What about FPR is it also a PWM Signal?

 

Yep, EGR is PWM. The duty is set based on anticipated vacuum level from a table vs RPM and load.

FPR is not PWM to my knowledge, but my guess is that its state is still set in that same subroutine.

 

What do you plan to drive with the table and solenoid?

 

An exhaust butterfly. Because of the strict law, here in germany loud exhaust aren't allowed.

The testing does only test between 50kmh and 80kmh at WOT. At this point i like to keep my exhaust butterfly closed.

 

What relay is that? I'm talking staged switching here (IE second pump only comes on at onset of boost)

Yup, EGR is definitely PWM. I think the old old old stale EGR was just on/off. FPS is also just on/off to my knowledge, but I have no idea what the conditions are. I wouldn't be surprised if its "on" condition was set by that routine though. That would make it alot easier to replace it with a faster acting solenoid and use it for something useful

 

Under low load conditions the power to the pump is passed through a resistor that drops the voltage to the pump. At higher load full voltage is sent to the pump. I don't know what the exact conditions are for it to switch over, but if someone were to disassemble the code and you were to do a bit of wiring changes it could work for what you want. The factory switchover conditions might even be sutable for your needs as is. You can check the factory service manual for more info.

 

That would be GREAT! I was totally unaware of this. That would be a huge help for all of the e85 guys who currently do the tedb venturi reduction mod to the siphon.

MrFred... any chance you can put this somewhere on your list of fun?