Chebosto

iTrader: (43)

well since i need to pull the RPM signal off the ECU for my heads up display... i can only get 1/6th the pulse off the coils..

does anyone know how the greddy or ultimate racing RPM adapter wiring works? is it just taking the signals off of the ECU pins 60, 61, 62, 79, 80, 81 and just merging them into one wire and adding a ground wire?

i really dont want to spend like $50 it if it only takes like $2.99 to make from radio shack..

can anyone help me out?

thanks

350Now

Hey Cheston,

You're correct. The Greddy RPM Adapter takes 6 signals off the ECU then sends 1 signal to the e-manage and 1 ground wire.

Jeff

Oops.. it's 60,61,62,79,80, and 81.

Chebosto

iTrader: (43)

yea.. i just want to figure out the 'black box' wiring diagram...

the FSM says the average voltage for the even coils were 0.4V at 2500, and 0.4V average for the odd coils..

what i gotta figure out is do they total at the ECU signal, or is it 0.4V for all six...

then that would be simple-

the ground wire, needs to keep the system in the loop...

check out ultimate racing's wiring adapter.. looks too simple--

Z1 Performance

iTrader: (564)

call me Cheston, we have the adapters

350Now

sorry haven't opened up the black box to see the diagram.

SKiDaZZLe

cheston: your HUD cannot be set to use 1 signal RPM? that's wierd...

anyways... i can get my hands on the black box tomorrow...

i assume there is just 8 wires (6 in, 1 out, 1 ground), 6 diodes (to prevent cross-talk) and maybe a resistor... i will let you know tomorrow.

m

Chebosto

iTrader: (43)

Thanks Michael-


yea. its 6 in 1 out, 1 grnd...

i think there is a rectifier diode attached to the 6 inputs (from the power transformer) and probably a voltage regulator to keep the output around 0.4V...

freakin A... HUD makin me dust off my old EE books.. %#@ i wish i was 19 again...

SKiDaZZLe

cheston: there was a fire in my building at work this morning... haven't met up with tim to get the black box yet... i guess i will give you another update tonight.

m

Chebosto

iTrader: (43)

hmm..

so i was looking up rectifier diodes..

you can create a Diode Logic gate with the 6 input signals off the ECU.. in either an OR gate or an AND gate.

the ECU, i believe is acting as an AND gate for the all-injector pulse signals for engine RPM signal..

am i correct to assume this?

Chebosto

iTrader: (43)

OR gate-


disreguard the above AND question.. i think now the ECU is OR gate. because if 5 out of the 6 coil were to work, your engine would still go, still giving RPM signal, but if it was an AND gate- you would get a false signal if 5 of 6 were going....

SKiDaZZLe

hey cheston, why the ground is necessary...? i would think it would work fine without it, no? whatever you are using to read the signal should reference it to ground internally, right?



m

Sharif@Forged

iTrader: (92)

Is the Greddy RPM adaptor really $50? I think there are generic ones from autometer or AEM for like $20....

Chebosto

iTrader: (43)

you gotta ground the resistor else you might burn out the diode- to limit the current..

also. what is important to note is you dont want to fukk up the signal the ECU gets to the injector signal, because thats what the ECU also uses those signals for VDC- so you should make sure the current only flows one way-