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Confused

1568 Views 11 Replies 6 Participants Last post by Scott K., Apr 26, 2022

Scott K.

Discussion Starter · Apr 24, 2022 (Edited)

Had my 2019 redeye to a perf shop here in south Florida . Added their phase 1 kit.
They use a mustang Dyno.
Post install Dyno run Print out says 790 adjusted HP, apparently at the wheels ….
Adding 15 percent for the 8 speed automatic transmission gives me 908 HP at the flywheel?
car computer is showing up from 797 to 857…. Thoughts ?

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rayzazoo

· #2 · Apr 24, 2022 (Edited)

Scott K. said:
Had my 2019 redeye to a perf shop here in south Florida . Added their phase 1 kit.
They use a mustang Dyno.
Post install Dyno run Print out says 790 adjusted HP, apparently at the wheels ….
Adding 15 percent for the manual transmission gives me 908 HP at the flywheel?
car computer is showing up from 797 to 857…. Thoughts ?

What was the baseline dyno and peak rpm?

What were the parts used in the phase 1 kit? 2.85 pulley, tune, fuel octane?

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rayzazoo

· #11 · Apr 25, 2022 (Edited)

Scott K. said:
There in lies part of the problem , a baseline was never done. I don’t see how I will know exactly how much I gained without a baseline. That being said estimations were used which is clearly not the way to do it but I had no choice.
The post install Dyno ran up to 6600 RPM.
The phase 1 included: the 2.85 pulley, larger injectors, “racing spark plugs”,170 degree thermostat, tune using my daily 93 octane fuel …

For a few estimations:

OEM 3.35 pulley, 700cc injectors, Bosch R6 spark plug, 203 tstat, 91 octane
Stock Redeye SAE: ~712 rwhp / 812 hp @ 6400 rpm = 12.3% drivetrain loss (87.7%)
Stock Redeye: ~ 698 rwhp / 797 hp @ 6300 rpm = 797 x .877
Stock Redeye: ~695 rwhp / 793 hp @ 6200 rpm = 793 x .877
Stock Redeye: ~17 rwhp / ~19 hp 200 rpm difference
Max engine speed: 6500 rpm

3.17 hellaphant pulley, 700cc injectors, Bosch R6 spark plug, 180 tstat, 91 octane
Direct Connection Stage II: ~734 rwhp / 837 hp (unknown rpm) = 837 x .877

2.85 pulley, larger injectors, "racing" spark plugs, 170 tstat, 93 octane
Modded SAE: 790 rwhp / 900 hp @ 6600 rpm = 790 / .877
Modded: 773 rwhp / 881 hp @ 6400 rpm = 790 - 17 and 900 - 19

2015-2022 Hellcat-Redeye-Demon-SS Peak HP/TQ Comparisons

2015 - 2017 Hellcat (compared to base 2015 Hellcat): 714 HP @ 6200rpm measured, 707 HP @ 6000rpm advertised 652 TQ @ 4800rpm measured, 650 TQ @ 4800rpm advertised 2018 Hellcat (+ electric power steering, widebody option with 20x11 rims) 730 HP @ 6200rpm measured, (+16 HP), 707 HP @ 6000rpm...

www.hellcat.org

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2015-2022 Hellcat-Redeye-Demon-SS Peak HP/TQ Comparisons

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