Thanks to Red_Cat and our runs this week at the ECTA 1 mile race in Arkansas, I am now regretting my 3.09 gears. He is running a stock 17’ Hellcat with driver seat and a few other items removed for weight. I am running a stock 19 redeye at full weight. He beat me and my son at the full mile by about 2 mph every run. We had better 1/2 mile speeds. We shift into 7th fear at about 160 and slow down. He carries thru in 6th. I think I will change to 2.62 and see if that helps. Either way it was a great weekend of racing with great people. My personal best was 181.45. I would suggest anyone who wants to run the mile go to ECTA. Got as many runs as we wanted. It’s painfull to say we were slower but we were.
Redeye vs Hellcat 3.09 vs 2.62 1 mile race
Southernminncat
21 - 40 of 68 Posts
With a DA low enough, absolutely...
With me at 7500-8500DA, I'm running 174-176*, while I haven't seen it first hand, 180-182 apparently is common in Texas. I've heard rumors of 185ish as well, but I have some doubt...
The guys who have run down at KSC might be the answer for the highest reasonable speeds...
*MY16 Challenger HC - M6, 3.09
I'm also not understanding the "slow-down" from a 6-7 shift... Certainly you always lose some speed at a shift, it obviously gets more pronounced as you approach VMax and go to each subsequently taller ratio...
The A8 ratio change from 6th, 7th and even 8th don't even suffer the high aspect ratio change that the M6 does from 4th to 5th...
(See steady, progressive slope of each gears ratio depicted in the screenshot compared with the M6)
See comment below
Now I think I understand the problem...
The 3.09 gears FORCE a shift to 7th. It's not exactly that there is a "slow-down" when shifting to 7th (FDR-2.596), it's that the acceleration isn't as great as it is in 6th gear, naturally(FDR-3.09). You've given up ~16% torque.
While the A8 with 2.62 ratio gears is still accelerating in a 6th gear ratio (FDR of 2.620), and STAYS there, the A8 with 3.09 ratio gears is FORCED to shift to 7th with a FDR of 2.596, this is just a bit taller although not by much, but you add the taller ratio AND the shift point itself and that explains it.
I had a similar issue when I went from 3.70s to 3.90s in my M6, the 3.90s allow for faster acceleration but ADDED a shift into 6th just before the Mile mark (see attached video), ultimately I gained 1-2mph in the Mile, but ONLY if I make that 5th-6th shift just right...
6250
Certain???
6200 is for a Hellcat
I was thinking either 6400 or 6500 carried over from the Demon setup...
We talking shift point.... I just datalogged it at 6240 but the fuel cut is 6500.
Fair enough, I'll double check in the spreadsheet, but it just aggravates the statement above...
Yes, shifting the HC in track mode is still before the 6200 redline. Also my "narrow-body" Hellcat is a little more aerodynamic, has skinnier tires, and weighs maybe 150 lbs or so less than the RE - I took out the HK subs, rear seat, trunk tray, floor mats, air compressor, and anything else not required by class rules. This really is a game of increments here and there helping close the gap to the higher power Redeye, and ultimately a quirk of the distance we were running.
In terms of speeds, the runway is only 254' above sea level so on a 50F morning good for fast runs.
In terms of speeds, the runway is only 254' above sea level so on a 50F morning good for fast runs.
No, they were alternating drivers.
I ran 179.1mph a couple of times at the same venue in September 2018, in 60F temperatures and without the tailwind we had on Sunday morning.
Going back in June. Sure wish a Redeye with 2.62’s could show up and see what it can do. If anyone wants to run as many laps as they want this is the venue. Ecta 1 mile Blytheville Arkansas.
A redeye widebody with 3.09s is slower in the long run. Widebody is less aerodynamic then regular body and add in the fact that the regular body had 2.62s. Run against a narrow body redeye with 2.62s and see what happens then we will know for sure.
I would really like to try this - what locations do they run on the west coast? The closest I remember seeing was Colorado... still a good distance away for me...
No, the Redeye uses the Demon's 41 spline heavy duty rear axles so I don't think they will fit in the older HC 2.62 diff.
Yes it fits.
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