about to do the first tune...


so it stands to reason that you should tune the graph in such a way that at a certain rpm directly coresponds to particular vacum # at constant steady and stable acceleration for eg. @ 5000 rpm stable = 5'' vac tune that block now does the other sectors above and below block " 5k-rpm=5"vac " increase or decrease in direct proportion again for example if that block was increased by say 5% then would the sectors leading to that block also increase by 5%? thanks again and hope you guys can folow what im saying.

thanks

 

If I understand correctly, you're asking if you should change the adjacent cells in your VE table, when making a correction to a particular cell.

Answer is, sometimes yes, sometimes no. You have to look at the overall situation, before deciding if you need to do that or not.

If you can get good data for the adjacent cells, use that. When you get to where you're working on the portions of the VE table that your engine doesn't use much, you may have less data available to work with, so you may end up having to estimate some values based on the ones you do know. Also, if you have data for some of the cells in a particular region, but not all, you can certainly use the ones you do know to estimate the ones that you do not know. This can help speed up the tuning process, especially when roughing things in at first.

Read the "730 part throttle tuning" article in the sticky posts, if you haven't already.

Also, you'll make life easier on yourself if you stop thinking in terms of vacuum, and start thinking in terms of MAP KPA. And when posting questions, it often helps if you mention what ECM & mask you're working with.

Good luck,