Not necessarily true. Drag racing is all about tenths and hundreths of a second meaning the difference between winning and losing. If you waste time letting the engine rev out to a point where it's no longer producing useable power, you just lost to that LS1 in the next lane! The Mach 1's "sweet spot" in the powerband, according to every dyno sheet I've seen, is between 3k and 6k, minus any forced induction. It drops off precipitiously after 6k, so letting it wind out to 6500+ rpms is just costing you precious time and the engine is no longer providing useable power, it's basically coasting. Powershifting is what keeps the engine in the powerband during shifting. I've never had the engine revs drop below 3k during shifts while racing at the track. On the street, it's a slightly different story, traction becomes a serious issue, plus there's no timeslip to worry about, so you have a little more wiggle room out on the street.wurd2 said:I'm no drag racing expert, but I think I've learned enough to know that you do not shift the instant your engine power begins to decline. If you did this, then you will be way out of power range when you shift into the next gear. I would think that you would want to take the RPM's some distance beyond the peak points.
I think the issue of shift points is more complicated than just shifting at peak points.
TR03Mach1 said:Not necessarily true. Drag racing is all about tenths and hundreths of a second meaning the difference between winning and losing. If you waste time letting the engine rev out to a point where it's no longer producing useable power, you just lost to that LS1 in the next lane! The Mach 1's "sweet spot" in the powerband, according to every dyno sheet I've seen, is between 3k and 6k, minus any forced induction. It drops off precipitiously after 6k, so letting it wind out to 6500+ rpms is just costing you precious time and the engine is no longer providing useable power, it's basically coasting. Powershifting is what keeps the engine in the powerband during shifting. I've never had the engine revs drop below 3k during shifts while racing at the track. On the street, it's a slightly different story, traction becomes a serious issue, plus there's no timeslip to worry about, so you have a little more wiggle room out on the street.
Crzyhrse said:Damn dude, that dyno sheet is a mess. Your power curve is all over the place. Up in one place, then down, then up again. You need to get a chip or tuner or something to smooth everything out.
I didn't even get into this, since I thought the original poster was referring to a fairly stock Mach 1 with 355's. But gears are going to mess up the entire equation, due to the multiplying effect they have on the engines' power. When you start running serious gears like you are, then you have to start experimenting, and just go with what works best for you.wurd2 said:so and I am also running 4.30's.
BurlyStang said:Good post, thalwang.
I have not tracked or dynoed mine, yet, but I have reamed her quite a bit over the last year. This is what I have learned concerning the street:
1. If I redline 1st, I roast 2nd & have to grab 3rd to get traction (not good)
*my rule-of-thumb: grab another gear if you lose acceleration, the gears are close enough together and the motor strong enough to recover - this is no GT
2. If I roll 1st into the intersection and then plant the accelerator, I can power-shift 2nd around 5800 RPM (about 3/4-way through the intersection)
It's CHIRP-AND-GO; just about perfect
3. My stock power band kicks in around 3200 and drops after 5800, so I try to keep the motor in that range, grabbing gears as I go.
I'm no trackster, but I hold my own on the street. I'm stock and do not have the benefit of 7-second burnouts, gears or soft rubber. I have not lost yet, to anything, most back down after about 60MPH; even cycles. The others watch the back of my Mach pull away at over 110MPH.
It's a strong 4V motor, keep it in the power band, regardless of gear.
BTW, I shift out of 4th at 5800 at ~130MPHJust saw that you were two hours up from me. If you see a white Mach with my Avatar over the trunk badge, it's me.
djlethalwang said:Anyway, I don't think we have any kind of Mustang roundup up here. This town sucks too bad for anything like that.
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