| Re: Track results, AFR heads |
Subject: Re: Track results, AFR heads by dan0617 on 2009/9/7 16:01:44 I've found that tire spin out of the gate = higher mph. Most have found that also. I've also found, though, that when you bog a stick, or easily roll into an auto, the 60' is slower AND the mph is slower. If you had spun to that awful 60' and still mph'd slower I'd be looking for a problem. Since you bogged it and ended up with that result, all you need to do is get rid of the bog. That said, chances are you need to add some lower rpm WOT timing. Probably best to do it in the PE timing table because if you add it in the normal timing table you might find it detonating when lugging up a hill at lower rpms on the street/highway. For every few degrees of timing you add you will need to add some fueling to keep it from being lean. When you drop the clutch, about what rpm does it drop to? Find that out, then from about 4000 down to or below that rpm add all the timing you can and add the fueling as necessary. I'll bet you will find that bog will turn into tire spin, or a wicked 60' time if they don't spin. You may find that you need more timing in your launch rpms than you do at and above your peak torque area. Might need your overall timing curve at WOT to go up fast, ramp back down at your peak torque, then back up some as you approach and pass your max hp and hit your shift point. I have my timing cut back below my peak torque rpms to help keep me from tire spinning or snapping my rear. I honestly think I could bring my timing "all in" much earlier and make alot more power but I'm cutting a mid 1.5 60' and could do better with a harder launch so I truly don't want any more power on launch right now. I did alot of playing with WOT timing in the normal and in the PE timing table to get it dialed in, and I was surprised at what can be gained/lost with timing and subsequent fueling changes at launch. |
