What triggering mode are you planning to use? PWM or MPS?

You need to decide on the mode before testing the system. If you are on the MPS mode, pin 17 should be reading a 0-5V MAP sensor voltage. If you wired pin17 to the fuel injector-, you will trigger the system.

 

Since you guys know more about this then I do, what is better and what do most ppl use? What consumes more methonal/water? pin17 is wired to the fuel injector so thats why its triggering the system ok that makes sense. So if thats the why I have it setup right now then I need to run it PWM mode, if I want to change it to MAP then what would I have to do?

Ok so I'm an idiot the test step 3a is for PWM and step 3b is for MAP and you only do one test for what your setup for

 

Yes you need to run it in PWM mode. You have it set in map mode while wired to injector duty cycle.

Switch the jumper on the v8 box to PWM.

(On a side note, ERL should default these boxes to PWM jumper from the factory) Add that to your checklist Richard.

If you wanted to run it MAP, then you would disconnect it from the injector and connect it to the signal wire of a 0-5v map sensor and switch the jumper to MPS on the v8 box.

 

I went ahead and just changed the jumper to PWM. Everything is just fine now, I went thru all the test along with a quick drive. I don't feel like having to run another wire to a map sensor right now, unless there is something I can use of the ecu.

what do you think is better? PWM or MAP mode?

 

One of the biggest reasons for spending the money on the aquamist kit is for the PWM input.

 

There's my answer

Totally off-topic and a goofy thought/question
So I was just thinking should you do a 2step launch with the on or off? I do bet it shoots some flames out the back

 

hey just one thing that I didn't see covered is spark plug & spark plug gap. Right now I have in the bpr7's and there gapped at .25 should they be gapped any tighter then that or do I need a colder plug?

 

i went one step colder bpr8es at a .24 to .25 gap

 

Question regarding wiring for use with tephra's alt-map hack for stock ECU. Alt maps are triggered by supplying 5V to a pin on the ECU. I can stick in a 220K resister to drop the 12v down to 5v, but I'm wondering what outputs provide the switched power for failsafe switching?

Following this, can I run a wire from +12V BVC to MAP-SW1, then run a lead from MAP-SW2 to the one pin on the ECU? This should provide 12V to the ecu pin when DDS is turned on, and 0V when failsafe occurs or the DDS is switched off. Is this correct?

For reference, Jack_Of_Trades made this diagram using a basic on/off switch and a LED to indicate if voltage is going to the ecu pin or not. I plan on using the DDS as the switch and not using a LED as shown.

 

Do you also run a MBC as on the diagram above?

 

I have altered a few things to improve the 5V supply to the ADC0F.

 

No, I am using the GM BCS, i.e. same wiring as factory BCS. This is key because tephra's alt map feature will soon be able to handle switching boost maps as well as timing/fuel. So simply supplying 5v or not to pin 42 is going to handle the boost failsafe, no MAC valve needed.

With that in mind, what kind of signal comes out of MAP-SW1 by itself? Does the MAC valve just operate on +12v or 0v? If that is the case, go back and read what I posted above again, I think it will work...?

 

I can post another wiring diagram with GM/OE valve. Before I do, you you want to reduce boost as well as switching MAP?

Pin11/12 is just a "voltage free" relay contact. Goes open circuit when a fault is detected or DDS3 switched off.

 

No, I do not need the DDS to do boost reduction. The very act of switching maps will be doing this. By supplying different voltage to the one ecu pin, the various maps in the ecu change.

Example (oversimplified but you get the idea):

pin 42 sees 5v (alky is on): Map#2 whereboost control settings for 28psi, 12.0AFR, running 20 degrees of timing peak.

pin 42 sees 0v (alky is off, or failsafe in effect): Map #1 boost control settings for 23psi, 11.0AFR, 14 degrees of timing peak.

So, if what you're saying in that pin 11/12 is voltage free,

and "+12V BCV" puts out +12V when dds is active and 0V when dds is off (or failsafe occurs)

then if you put a wire from "+12V BCV" into "MAP-SW1"
and then a wire from "MAP-SW2" to pin 42 on the ecu with a 220k 1/2 watt resistor in it, the following should occur:

when dds is active, 5v will be seen at pin 42 on the ecu, map#2 will be active

when dds is off or failsafe occurs, 0v will be seen at pin 42 on the ecu, and map#1 will be active.

 

yes, yes and yes.

It is easier to use the 220K resistor to jump between pin 9 (+12V BCV) and pin11 (MAP-SW1) and use pin12 (MAP -SW2) to to go pin 42.

Very simple. Follow the wiring diagram below: