timing recommendations
timing recommendations
i was wondering how much timing at wot across the rpm range that i can run on a stock jdm gsr with i/h/e with 92oct. fuel. i don't have access to a dyno to tune the ignition, so i was checking to see what people have been able to run timing wise.
This is what you have to do. I read this yesterday in the tech article from the site.
It is important to set the base ignition timing is a repeatable way before the ignition timing is altered. This is important as ignition timing will need to be reset of the intake camshaft timing is changed.
Like mixture, at first it is best to adjust the whole of the ignition table. With VTEC engines it is a good idea to do this for each cam separately. There are many strategies when tuning ignition timing, but one which works on a near-standard engine is to simply advance or retard the whole ignition table 2 degrees and perform a dyno run. If the torque curve moves upwards, keep adding or subtracting ignition timing until there are no power gains. If the torque curve moves downwards, then apply the opposite change to the ignition table. You should find a point where adding or subtracting 1-2 degrees timing will make very little difference to the torque curve. You may want to find the centre of this point by performing a few runs either side of the point of maximum output. For naturally aspirated engines you can set the ignition timing at the most retarded position which gives maximum power. For forced induction it is more difficult as the exhaust gas temperature and likelihood of detonation have to be considered.
If you dont have a dyno. You can always time it at the track and adjust the timing and make another pass. If you or someone can drive your car well you could probably get good results. I could be wrong though.
It is important to set the base ignition timing is a repeatable way before the ignition timing is altered. This is important as ignition timing will need to be reset of the intake camshaft timing is changed.
Like mixture, at first it is best to adjust the whole of the ignition table. With VTEC engines it is a good idea to do this for each cam separately. There are many strategies when tuning ignition timing, but one which works on a near-standard engine is to simply advance or retard the whole ignition table 2 degrees and perform a dyno run. If the torque curve moves upwards, keep adding or subtracting ignition timing until there are no power gains. If the torque curve moves downwards, then apply the opposite change to the ignition table. You should find a point where adding or subtracting 1-2 degrees timing will make very little difference to the torque curve. You may want to find the centre of this point by performing a few runs either side of the point of maximum output. For naturally aspirated engines you can set the ignition timing at the most retarded position which gives maximum power. For forced induction it is more difficult as the exhaust gas temperature and likelihood of detonation have to be considered.
If you dont have a dyno. You can always time it at the track and adjust the timing and make another pass. If you or someone can drive your car well you could probably get good results. I could be wrong though.
I'll have to disagree with this. I doubt retarding the timing makes max power.PR8urvtec wrote: You may want to find the centre of this point by performing a few runs either side of the point of maximum output. For naturally aspirated engines you can set the ignition timing at the most retarded position which gives maximum power.