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Adjustable cam gear effect on tuning woth DSM CAS adapter

S

S4gasm2.7T

Member
Joined
Dec 17, 2016
Before i start, if this has been covered i apologize for starting a new thread. I have attempted to google as well as use the search function, with no luck. So of this has been covered i would happily accept advice on where to find the info. Now onto my issue.

Im in the final planning stages of my build. And there is an issue i can't fully wrap my head around. When using one of Yoshifabs dsm cas adapters with the high res disk, in the block distributor location (in a 240), will how will changing the physical cam degree affect my tuning? Say if i advance the cam 5° but my triggers are still the same because i cant change them separately, is this a problem, or is this relatively easy to compensate for when tuning for sequential injection and ignition?

Thank you in advance for any insight.
 
By using the CAS, I'm assuming you'll be running a standalone ECU? If ao you can advance or retard your ignition timing as much as you want. Its software. It doesn't care where the cam is as long as the software knows where TDC is. It will then fire the ignition at any degree before tdc you want.
 
HiSPL said:
By using the CAS, I'm assuming you'll be running a standalone ECU? If ao you can advance or retard your ignition timing as much as you want. Its software. It doesn't care where the cam is as long as the software knows where TDC is. It will then fire the ignition at any degree before tdc you want.
Click to expand...
Thats was i was expecting. This is my first standalone build so no real experience withbthe tuning software yet. Gotta learn somehow right. Just wasnt sure, so figured no dumb questions right 😅.

Thanks again man.
 
Just as an example, on my son’s 07k swapped Porsche 944 the crank trigger wheel was something weird like 80 degrees off TDC. We had to just figure it out where the skipped tooth was and then enter the offset. Car runs beautifully now NA and is currently getting a turbo.
 
S4gasm2.7T said:
Before i start, if this has been covered i apologize for starting a new thread. I have attempted to google as well as use the search function, with no luck. So of this has been covered i would happily accept advice on where to find the info. Now onto my issue.

Im in the final planning stages of my build. And there is an issue i can't fully wrap my head around. When using one of Yoshifabs dsm cas adapters with the high res disk, in the block distributor location (in a 240), will how will changing the physical cam degree affect my tuning? Say if i advance the cam 5° but my triggers are still the same because i cant change them separately, is this a problem, or is this relatively easy to compensate for when tuning for sequential injection and ignition?

Thank you in advance for any insight.
Click to expand...
The aux/distributor shaft, which runs the CAS is not impacted by adv/retard of the cam timing. It just needs to be set correctly/repeatably with the crank and aux timing marks. Otherwise the timing will drift from what it is set to in software.
 
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