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Challenger SRT Demon
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Discussion Starter · #1 ·
whoever has the A8 and is starting to get into the car and get great 0-60s and quarters what are the ideal rpm limit settings for each gear?
 

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whoever has the A8 and is starting to get into the car and get great 0-60s and quarters what are the ideal rpm limit settings for each gear?
That's the fun stuff you figure out at the dragstrip. I'm a nice guy but when I dial mine in I ain't giving that up sorry
 

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DRIVESRT.COM
Challenger SRT Hellcat
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As a starting point,

Edit: Had to correct for RWHP as I was originally looking for RWTQ numbers.

2nd gear start (8HP90 auto)
shift lights to 6,250rpm.

2nd to 3rd 6250 / 4180rpm in 3rd
3rd to 4th 6250 / 4970rpm in 4th
4th to 5th 6250 / 4828rpm in 5th

NET RWHP - 591.23 @ 6,250rpm shifts - 734 HP
NET RWHP - 574.47 @ 6,000rpm shifts - 713 HP

1st gear start (8HP90 auto)
shift lights to 6,250rpm.

1st to 2nd 6250 / 4167rpm in 2nd
2nd to 3rd 6250 / 4180rpm in 3rd
3rd to 4th 6250 / 4970rpm in 4th
4th to 5th 6250 / 4828rpm in 5th

NET RWHP - 586.45 @ 6,250rpm shifts - 728 HP
NET RWHP - 569.29 @ 6,000rpm shifts (19.48% drivetrain loss) - 707 HP

2nd gear start (6-speed manaul)
shift lights to 6,250rpm

2nd to 3rd 6250 / 4707rpm in 3rd
3rd to 4th 6250 / 5252rpm in 4th
4th to 5th 6250 / 4813rpm in 5th

NET RWHP - 629.34 @ 6,250rpm shifts - 737 HP
NET RWHP - 610.44 @ 6,000rpm shifts - 715 HP

1st gear start (6-speed manual)
shift lights to 6,250rpm

1st to 2nd 6250 / 4369rpm in 2nd
2nd to 3rd 6250 / 4707rpm in 3rd
3rd to 4th 6250 / 5252rpm in 4th
4th to 5th 6250 / 4813rpm in 5th

NET RWHP - 622.79 @ 6,250rpm shifts - 730 HP
NET RWHP - 603.46 @ 6,000rpm shifts (14.65% drivetrain loss) - 707 HP


These numbers take in to account an automatic Hellcat dyno run and manual Hellcat dyno run. The numbers for manual and auto will be different because they are different dynos, different conditions, on different days. Based on the data below, the numbers and gears were calculated out to find the the maximum amount of NET rear-wheel horsepower produced through all of the gear runs based upon selected shift points.

Auto Dyno run


Manual Dyno Run
 

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Challenger SRT Hellcat
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You need to shift higher so that the car stays in it's power band.
 

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Challenger SRT Hellcat
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Not that I use the shift lights too much, but I have all of mine set at 6250 RPM. Dyno graphs show the power curve still climbing all the way up to redline, so why shift early? The black Hellcat that ran 10.4 was able to do so by shifting manually exactly at redline, rather than letting the car do it for you in 'D' which will shift a few RPM shy of redline.

Now keep in mind, using this on the street will not allow you to stay at legal speeds. :)
 

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Challenger SRT Hellcat
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Remember, torque gets mass moving and HP keeps it accelerating, you need to stay in the HP power range.
 

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I think you'll find that the car that ran the 10.48 also shifted in the 6200 range, nitrous or not the engine likes to breath with the blower.
 

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Charger SRT Hellcat
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Thank you for all of that info. Would have thought 1st gear should be better for accleration.

Guess when more people get their Hellcats, the closer these cars will be in the 10 sec 1/4 mile range.
 

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Left Shark
Challenger SRT Hellcat
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1,141 Posts
Thank you for all of that info. Would have thought 1st gear should be better for accleration.
Sure if you can get traction...which we can't. If we had some fat, wrinkle-wall slicks and a chassis setup that would carry the front wheels 10" in the air for the first 60', then first gear it is!
 

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Premium Member
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As a starting point,

Edit: Had to correct for RWHP as I was originally looking for RWTQ numbers.

2nd gear start (8HP90 auto)
shift lights to 6,250rpm.

2nd to 3rd 6250 / 4180rpm in 3rd
3rd to 4th 6250 / 4970rpm in 4th
4th to 5th 6250 / 4828rpm in 5th

NET RWHP - 591.23 @ 6,250rpm shifts
NET RWHP - 574.47 @ 6,000rpm shifts

1st gear start (8HP90 auto)
shift lights to 6,250rpm.

1st to 2nd 6250 / 4167rpm in 2nd
2nd to 3rd 6250 / 4180rpm in 3rd
3rd to 4th 6250 / 4970rpm in 4th
4th to 5th 6250 / 4828rpm in 5th

NET RWHP - 586.45 @ 6,250rpm shifts
NET RWHP - 569.29 @ 6,000rpm shifts (19.48% drivetrain loss)

2nd gear start (6-speed manaul)
shift lights to 6,250rpm

2nd to 3rd 6250 / 4707rpm in 3rd
3rd to 4th 6250 / 5252rpm in 4th
4th to 5th 6250 / 4813rpm in 5th

NET RWHP - 629.34 @ 6,250rpm shifts
NET RWHP - 610.44 @ 6,000rpm shifts

1st gear start (6-speed manual)
shift lights to 6,250rpm

1st to 2nd 6250 / 4369rpm in 2nd
2nd to 3rd 6250 / 4707rpm in 3rd
3rd to 4th 6250 / 5252rpm in 4th
4th to 5th 6250 / 4813rpm in 5th

NET RWHP - 622.79 @ 6,250rpm shifts
NET RWHP - 603.46 @ 6,000rpm shifts (14.65% drivetrain loss)


These numbers take in to account an automatic Hellcat dyno run and manual Hellcat dyno run. The numbers for manual and auto will be different because they are different dynos, different conditions, on different days. Based on the data below, the numbers and gears were calculated out to find the the maximum amount of NET rear-wheel horsepower produced through all of the gear runs based upon selected shift points.

Auto Dyno run


Manual Dyno Run
This is awesome info. I am going to try this with my manual in custom setting track mode with sport suspension and 6250 rpm starting in second. I'm thinking that will help with wheel spin. If the darn roads would stay dry long enough to figure it out!!o_O
 

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DRIVESRT.COM
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This is awesome info. I am going to try this with my manual in custom setting track mode with sport suspension and 6250 rpm starting in second. I'm thinking that will help with wheel spin. If the darn roads would stay dry long enough to figure it out!!o_O
It will definitely be interesting to see what results come from this in the real world.

Just to think, 1st gear would merely become the "burnout" gear :)
 

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Premium Member
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13,620 Posts
It will definitely be interesting to see what results come from this in the real world.

Just to think, 1st gear would merely become the "burnout" gear :)
Yeah, I can't wait to get better meat on the back. It will be good to have it dialed in a bit more before I do. I appreciate your share. Definitely worth trying.:D
 

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Challenger SRT Hellcat
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1,039 Posts
Hey rayzazoo - Okay, I'm the fool here that doesn't understand what your 2nd set of RPM numbers represent? Can you please explain one of the lines that I'm sure apply for each line. Sample copied below:

2nd gear start (8HP90 auto)
shift lights to 6,250rpm.
2nd to 3rd 6250 / 4180rpm in 3rd
3rd to 4th 6250 / 4970rpm in 4th
4th to 5th 6250 / 4828rpm in 5th
 

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DRIVESRT.COM
Challenger SRT Hellcat
Joined
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5,242 Posts
Hey rayzazoo - Okay, I'm the fool here that doesn't understand what your 2nd set of RPM numbers represent? Can you please explain one of the lines that I'm sure apply for each line. Sample copied below:

2nd gear start (8HP90 auto)
shift lights to 6,250rpm.
2nd to 3rd 6250 / 4180rpm in 3rd
3rd to 4th 6250 / 4970rpm in 4th
4th to 5th 6250 / 4828rpm in 5th
The parts in red represent the RPM that your engine will be at once the shift completes. For example, when the transmission shifts from 2nd into 3rd gear at 6,250rpm, the starting RPM the engine will be at in 3rd gear will be 4180rpm.
 
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