| Author | Message | ||
     Driven |
When cruising at a steady speed and the revs around 3200 I am feeling a flat spot. Seems like I remember seeing a dip around there on a dyno chart as well. It's not bad, just not perfect. Is this common? Is there a fix? Will a pipe help/exaggerate it? | ||
| Ft_bstrd |
There is a "weak" impulse at 3,000 RPM. If you cruise there, you can feel it. It's part of the fuel mapping and the ECM hunting for the proper fuel mixture. Go a little faster, and you don't feel it. Go a little slower, your fillings fall out AND you don't feel it. 3,000 is simply the magical spot. | ||
| Rotorhead |
I'm playing around at that rpm area on ECM spy with no luck yet. My learning curve is shallow but I'll keep trying and post when or if I ever get it figured out. | ||
| Chadhargis |
Spin that bugger through 3000rpm as fast as you can and cruise no lower than 4000rpm. I cruise from 4000 to 5000rpm and get good performance and fuel mileage. It's the engines "sweet spot" for sure. | ||
| Ft_bstrd |
Aye that, tall man! | ||
| Johnboy777 |
According to Steve Trumbul's Tuning Guide, the highlighted section of the map is Zone 5 Cruising Midrange. You could try fattening up the cells within the appropriate RPM columns.   | ||
| Ft_bstrd |
I don't think it's a fuel map issue. | ||
| Johnboy777 |
You may be right Fatty... But its always worth a try. Based on the fact that I don't know what I'm doing, here's what I would try first. Just highlight these 8 cells and add 5 points to all of them at the same time, as I have done to this stock map. Save the stock map 1st of course, and burn this new one in. Simple... try it, if it doesn't work, just go back to your stock map ... no harm done.  | ||
| Id073897 |
That's all closed loop, so changing the map won't help, it will only make AFV run amok. Regards, Gunter |
