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Dylan wrote:Funny Y1 is missing on the board of one. Wonder what that component does?

Its the main clock/crystal. The one that looks to be missing is a later PCM with a smaller component footprint.

nutbag355 wrote:How do I identify that? So the knock board is part of the actual pcm board not the memcal itself? If that's the case then I will be using the hsv spec pcm to utilize the knock detection.

Make sure its a V8 filter too, the V6 filter is common as it was in all models not just HSV but wont work on a V8. Cross reference here .. viewtopic.php?f=11&t=214&start=20#p13685

Thanks for that, I'll check it out when I get home.

So the hsv memcal gives me two possible types, any clue to tell any difference or if there is anything different between the two? I can't see the code that is normally viewed through the left window on the memcal as it is covered with h a sticker from the shop for that tuned it which is just their logo. Only code I can see is the '1F1043' which I assume is the knock filter code??

from the info I have BKBJ is 94 model 5.7ltr auto (424 pcm) and BKBK is 94 model 5.7ltr manual (083/305 pcm) both are for 215kw HSV's.

so if you have a 424 that pretty much answers which of the two it is.

Well that's interesting given that I'm fairly sure th engine isn't a 355 unless it's very tired haha it still makes me curious

yeah but if its not a stock tune then who knows whats been done, it may be that the tuner used that memcal as it was a HSV one and then tweaked it....

best bet would be to remove the tune from the memcal and see if it compared properly to anything else.

at a guess I would say the main difference other than the ve and spark tables would be injector size for the 5.7 .... so if your car has had different injectors that might be part of the change....

also does it have a knock sensor actually connected ? I had a mate bought a VS V8 with hsv memcal, it had the knock enabled in the tune and had the knock filter, but it didn't have the sensor connected, was a bucket of shit, and rightly so because the entire spark map was retarded 10 degrees!

That's is very true. If I was to hazard a guess I'd be assuming nothing has actually happened to the tune other then the 5.7 memcal has been put into the pcm and no actual tuning has taken place. But I can't confirm that until I get set up to pull the tune out of it with the laptop.
I haven't paid any real attention to the sensors yet as I haven't really spent any great amount of time on the car mechanically other then refitting dizy and manifold just to get it running as they weren't fitted to the car when I bought it

Geez the vs would have been a slug to drive with no timing in it lol. Was that the knock strategy pulling the timing or just shit tune?

yeah it retards the timing 9 degrees or something like that if there is a knock sensor fault.

in the case of my mates car we didn't get to see the difference as he pretty much bought the car and pulled the motor out to rebuild it with work done, and I found out the tune was like that after he pulled the motor.

I can confirm how shit a the engine performs with retard active all the time. In my V6s I disable the knock retard function all together as the system is primitive and has a hard time telling mechanical noise (especially exhaust scavenging pulses when good extractors are fitted) from real knock. My old VP v6 used to take 10.5 sec to 100 with T5 and once I found it was really retarding falsely I got it to 7 sec flat once disabled.

It really made that much difference!

So can you adjust the sensitivity/hurtz of the knock filter in the strategy or is it just on or off?