neffets

Installing a vems ecu in my car that was bought through the group buy.
First time to use standalone ecu, so alot of reading and head scratching

first i installed wbo2 and pulled the cable together with the vacum hose into the car and under the driver seat. DME55 plugs right into VEMS, and another plug for the wb02 sensor.
I also changed my injectors to Bosch 0 280 150 951, they are about 305cc/min at 964 fuel rail pressure, and are single narrow spray.
Adjusted req_fuel to 13ms

Had to make a adapter for the tps sensor (gsxr600 I had laying around) and a pipe to replace the barn door maf.
Connected a flying lead to 12v from inj6 to feed the ecu.

The hole process only took a couple of hours, making the tps adaper took the longest.

It started right up, and idles perfectly at about 1.01 lambda, and no fuel smell since even with my catbypass, with the old dme the engine would smell of fuel when it was shutdown So there's an improvement already

Then of for a test run, it lacked power and was vibrating under load, so started the live ve analyzer but drove home after 20min, feelt like I had ignition problems.

Then to check all the ignition components only to find all was ok, hmm, so I starte unplugging one and one injectors, guess what cyl2 is not injecting fuel.
Did my newly cleaned old inj fail already?
Nope, tested it, that worked, then measuring for gnd on the connector using the test function in VEMS, no ground.....

Then I also saw that the inj don't fire in the right cylinder?

neffets

Yes I only used 6 of them

neffets

Managed to fix the signal to inj2

Then I change the order of the injectors.
But that resulted in a hunting idle, going from 500-1500rpm up&down and not stabilizing??

neffets

changed it back to how it where in my first post, and then it idles perfect.
how is that possible? I checked the wiring from each inj to 55pin connector and to vems ecu, and it should be like above. So what am I missing here?
Or am I reading the wrong table? I'm reading the numbers right of the red arrow.

neffets

Next question

Why does the ign table only go to 5500rpm when my VE table goes to 7000rpm?

FeralComprehension

I don't have any information for you but am very curious and hope you keep posting!

Good luck, and enjoy your cool car.

alexjc4

I guess you got this from Peep, I'm sure he'll assist getting this working with you.

Did you add the diode across the idle air valve?

Oxbow

Hi
I have my VEMS also buy in this group and i am at the Moment to ajust the fuel table but i use the orginal Injectors from 964.
why you add a diode at the idle air valve ? i know Vems need some diode for the Injectors
Peep support my realy phänomenal :-) thanks

Duck

Hi everyone,

I have changed direction with the supercharger but will still install the VEMS with wasted spark. Really want a coupe instead of a cab. However with prices the way they are, I will probably take proceeds from sale to buy a D. Moris hardtop.

For the idle bypass valve, I connected in a diode as below.

How did you make the flyback wire for the injectors?

Peep is very good and has put up with hundreds of my emails.

robt964

>but will still install the VEMS with wasted spark

Good man! Can I pick your thoughts on where to mount the coils? There are a few options but each has pros/cons. I'd ideally like to continue using the original HT leads as custom ones are expensive and will no doubt introduce sourcing issues at replacement time.

Duck

Hi Robt964,

I really lucked out as there was someone returning their car to stock before selling and Raceboy was able to sell me their bracket. See pics below. Nice thing is that the coils will mount where the current distributors are. Found also this plug for the distributor hole from Clewett. Just now have to get the old intake back in.

Let me know if you want any further pics.

Glad to see several people working with VEMS to bounce ideas off of.

robt964

Thats very clean indeed. So where do the two legs secure to? Does the long leg fix to the distributor clamp bolt? and the shorter leg ?

Oxbow

i connect the flyback wire for the injectors over the AFM cable pin number 3. Pin 1 and 4 are the Mat sensor. The diode is inside VEMS for the flyback.
i installed VEMS 2 month a go but i have to do some run that Peep can correct the fuel table.

neffets

What's the purpose of the diode on the isv?

I did a long run yesterday with live tuning, but it takes a lot of time to get the upper rpm row with enough data and at the same time keep my license

Here is a 2.gear log, my injectors are already at 80% duty cycle and these are 305cc so stock I guess would be close to 100% which isn't recommended.

neffets

oxbow you have to go into settings and increase the "max allowed change", stock is 10 you have logs that show 25
have a look at this