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Challenger SRT Hellcat
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32 Posts
Discussion Starter · #1 ·
Having come from years of racing a nitrous powered fox body where the launch technique was to launch from idle, flooring the car to let the converter flash to 3400 rpm, which is where the nitrous window switch was set to come on, the "roll into the throttle technique" used by most Hellcat racers using a 17" tire of choice seems very foreign.

Most of the posts I have read in regards to launch technique with 17's,either 305/45 or 315/50, all state to quickly roll into the throttle and not just instantly mash the pedal to the floor. My question is do the 15" conversion guys running ET Street Pro's or slicks still use this roll into throttle technique or do they immediately floor the car letting the converter flash and/or floor the pedal with the car loaded up a little (more forgiving to driveline)?

I would much prefer to set the car up to be able to just mash the gas either from idle or loaded which allows me to concentrate on the light, etc. and not be worrying about how quickly I'm rolling into the throttle. Is this doable on a 15" drag tire in these cars? For reference car is a full weight Challenger Redeye, 3.09, A8, 2.75 upper pulley/stock pinned lower on E85 - 900ish hp.
 

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2020 Challenger HC A8
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71 Posts
As long as the track has decent prep a 17" radial will hook just fine smashing the gas.

My car launches best from 1200 rpm and mashing it, I've tried leaving higher but mine bogs..
I also use a Holley Sniper CANBUS shift light with it's "launch" rpm set to 1200 to help me hold 1200rpm.

I went out last week and hit a handful of 1.55 - 1.57 60;s running behind some big tire guys. My 275/50-17 M&H DR;s stuck like glue with a 5s burnout.


Traction issues started when mixed in with street tire guys and I had to modulate the throttle.

I really hate wasting time at the track with traction problems so I'm going to mount up my 17" Hoosier slicks and try them in the street tire line next time go out to see how the 'Cat works on them.

They work fine on my old SC'd 3v with a T-56 leaving at 6000 off a 2-step clutch dump,,
I figure they'll hook hard behind an automatic

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Charger SRT Hellcat
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149 Posts
On my 15" setup I would preload to roughly 1500-ish (if I remember right) then mat that thing as fast as I could. Actually, going through logs with Curt when tweaking the tune he caught me subconsciously rolling into as an old habit from running 18" and 20" street tires after I had told him I was smashing it as fast as I could. I had to consciously make myself smash it immediately with no rolling it on. That was a hard habit to break when racing heads up on a pro tree or instant-green because there is so much else going on. This is with excellent track prep though.
 
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