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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 07-11-2014, 08:20 PM   #1
thundercat 1
 
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drag racing a stick car

were do you guys shift at peak torque or peak hp someone told me to shift were the torque and horsepower meet on the dyno sheet . I don't know .any advice .stick car with supercharger.thanks
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Old 07-11-2014, 08:25 PM   #2
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Should shift at peak HP or slightly past it depending on your power curve.

You basically want the engine to spend as much time as possible in the best part of it's power curve.

If you make say a peak of 500 RWHP, you'd want to spend time where you make the most power... peak. Shift to early and too low, you could be shifting where the car is only making 450 rwhp, and on your shift, the RPMs will drop even lower.

Hope that helps.

Some folks in pro classes will shift past peak HP because the drop-off is not that bad and they are trying to keep the RPMs up.
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Old 07-11-2014, 08:51 PM   #3
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Quote:
Originally Posted by thundercat 1 View Post
were do you guys shift at peak torque or peak hp someone told me to shift were the torque and horsepower meet on the dyno sheet . I don't know .any advice .stick car with supercharger.thanks
I would say shift it 4 to 500 past peak HP. I peak at 6500 but it does not fall off hardly at all, I shift at 7000-7100. Puts it right in the sweet spot for the next gear. But all set ups are different, play around and see what works best.
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Old 07-13-2014, 11:38 AM   #4
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thanks I will try it
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Old 07-15-2014, 03:50 PM   #5
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Higher the better but stay off the limiter. lol. I am finally getting the nads to shift higher and I've picked up 7-8 mph on the top.
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Old 07-15-2014, 07:20 PM   #6
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car went 11.11 at 126.55 with a 1.60 60 ft just trying to go faster
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Old 07-15-2014, 08:42 PM   #7
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Holy s**t thats what I'm talking bout take that Hellcat/ZL1/GT 500 lol. Congrats
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Old 07-16-2014, 06:40 AM   #8
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Quote:
Originally Posted by thundercat 1 View Post
car went 11.11 at 126.55 with a 1.60 60 ft just trying to go faster
Nice 60'. I'd like to hear more about your setup if you don't mind sharing. Tires, clutch, suspension and launch (clutch dump or slipping).
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Old 07-16-2014, 11:02 PM   #9
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m&h drag radial- m&h skinnys -weld rts 17 inch --rxt clutch-zl1 hd driveline-tie rod and toe rods bmr--stock struts and springs-drag aligement on rear -3500rpm slip clutch about 3 or 4 ft-- car made 619 hp and 565 tq tuned by complete street performance -sc -ls9 cam- borla headers -3.4 pulley
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Old 07-17-2014, 02:15 PM   #10
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If you change shifting points and see an increase in RPM you are shifting where you make more power, good stuff.
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Camaro Now: Mods for the Masses Part I | Part II
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | Headers, Cats | 555R DR | CAI | UDP | Tune
12.06@113 1.70 | +NT05R 18s | + Circle D 3200
11.84@113 1.59 | + 3.91s | +Race Star 17x7s
Mods: GPI Tune | Bo's PTB | Kooks LTs | Hooker Maxflows | Circle D 3200 | New Era OTR | RCR AirRam Manifold | Powerbond UDP | 3.91s
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Old 07-17-2014, 08:42 PM   #11
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never really payed much attention to where I shifted the car now with a dyno sheet I know when to shift .may have been missing a lot of power .we will see next time at the track.
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