My car is Cultus 2006 and came with STAP 00B (Sequential Timing Advanced Processor) equipped from the factory. I know that this STAP is basically a retarder which retard the timing when car is driven on petrol. And the procedure according to the STAP manual and posts here on PW says to adjust the timing mechanically using distributor first on CNG and then switch to petrol. When switched to petrol, adjust the timing using variable resistance knob within STAP box under the dashboard. Also cut the wire going from pick-up coil to distributor. In this way, your car will be tuned to both CNG and petrol at the same time. (Please correct me if I am wrong)
The other day I went to mechanic for CNG adjustments after driving on petrol for 3 months. Initially its timing was adjusted to 10 deg BTDC on petrol. Now, mechanic has put back air blockage as well as advanced the timing to 18-20 deg BTDC. I asked him if timing can be adjusted using STAP. He drew a face as what the heck I was talking about!!! Not so many people knows about STAP in Cultus.
Now problem I am anticipating is that with car tuned on CNG settings with 20 deg BTDC, if I switched to petrol without STAP adjustment the car will drive on 20 deg BTDC on petrol which is far too much advanced and may lead to high petrol consumption as well as chances are that it will start knocking. I want to run on petrol with 10 BTDC and on CNG with 20 BTDC without compromising fuel average and performance. That is possible with the help of STAP 00B but I don't know how to do it and neither do the ustaads!
Can I DIY this STAP adjustment? If there is any pictorial description you or anyone here on PW can provide, it will be highly appreciated as well as will help a lot to PWers who dont know what wonders can STAP do to the car! As It will literally shut the bonnet of the car from mechanic
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