Originally Posted by zlathim
I've heard that Mustang dynos are typically lower than DynoJets, but I think the numbers on this dyno are "corrected" to read like the latter. I really don't know much about that stuff, TBH.
It's tuned on 91 octane which is the best pump gas we can get here. Will be eventually revising the tune to burn 110 octane for racing, which should allow me to run a few degrees more spark advance.
I just ordered tires today. I'll be running 275/40/17 Mickey Thompson Street ET R rears and skinnies up front on dedicated drag wheels. The overall diameter is almost 2" smaller than my stock tires, which will give me the effect of a little lower gear ratio. I already have 4.10 gears (stock is 3.45), but these heavy pigs can use as much gear as you can get.
In the end, I have the car to run high 11s, but whether I have the talent to drive it that well is still in question. I haven't drag raced in 30 years. Last time I raced was in 1989 at high school drags.
Lots of correction factors on the dyno, necessary tuning tool without question but I always preferred to race the track, not the dyno.
Ford's tunes are pretty rich (safe), if you fully trust the fuel there is some HP to be gained by targeting a leaner WOT lambda in N/A apps on gasoline, along with getting more aggressive on the timing and advance rates.
The MT ET R's are supposed to be good, you should like those.
Agreed on the gear for the most part, although the way a 6R80 is setup 4.10's cause you to have to hit 4th and that extra shift ends up costing time compared to just running less gear and letting it eat through the traps in 3rd up near the limiter. It is faster off the line but you pay for it with the extra shift on the top end. Any other trans/any other app is probably different this isn't applicable....
When I go through the car eventually I'm going with a looser converter and go back down in axle ratio to 3.55-3.73, live n' learn. When I went 4.10 I was thinking "I'm going to spool this thing up with no converter!"
Mine was 4300lbs stock, got it whittled down to about 3700.
You'll be fine, just go make some passes!