How do you guys go about tuning part throttle?

Let's assume that the WOT tuning has been done either on a dyno or the road.

Do you just smooth the numbers leading up to the higher load cells for WOT?

It seems to me that using the plateau/block of numbers that you are perhaps leaving some performance for part throttle on the table. How do you differentiate between using a block of timing numbers to avoid timing jumps that cause knock and using more timing in lower load/rpm like the stock map does for better part throttle power???

Unless you are soley a drag racer (WOT) part throttle tuning is where you will get most of your gains for autox or road racing--in addition to the WOT tuning of course.

 

It becomes trial and error.. Now your dealing with transitional load that tends to vary, the block timing method helps reduce the knock you would see, but it leaves power on the table at part throttle.

To properly tune for part throttle, you have to accept knock at part throttle, at least a small amount, especially as load changes..

 

When you talk about "blcok timing" are you saying that you just sort of use a smooth timing map around a large area?

 

Block timing means using a single timing number in the upper right hand corner of the map


12 8 8 8 8 8 8 8
11 9 8 8 8 8 8 8
10 9 9 8 8 8 8 8

etc.

 

Where is this "block" applied?
Why would someone just arbitrarily change their timing map to look like that.
Sort of takes the "custom" out of "custom tune"

 

There are areas of the ECU's map where the load can change dramatically and very quickly, if you have a smooth map from 2 degrees to 8 degrees (this is an example only) If you were to make a smooth pull that the load smoothly goes through the cells, you won't get knock, but the same map may skip from 120 load to 200 load, and you have a 6 degree jump in timing (remember this is only an example) and the result would be knock from the jump in timing.. Its likely not even real knock, thats the funny part..

But many tuners work through this by using a block of timing in the transitional areas that tend to be troublesome since the turbo may spool very quickly or load increases very rapidly in those areas..

The trick is to go back and massage the areas around it to create smooth transitions in the load regions that don't transition to higher load cells as quickly..

 

I think I understand now. Thanks.

 

It'd be great to monitor the load cells in realtime. Hey MJ, when is the maptracer coming out?