that is way low.... I hate silly questions but going to ask one... did you have it in 500 HP mode?

 

No, ECO nor Valet mode was on. This was Track Mode. I’m super confused, it just doesn’t seem right.

I have also swore I felt a sort of lurching on cruise control at highway speeds. It’s hard to describe but it was almost like it was very briefly starving for fuel. I’m running 91 or 93. 900 miles on vehicle. Not throwing any codes either.

 

good luck. I have no good advice but defiantly seems low/ wrong

 

Take it to an 1/8 or 1/4 mile track, make a pass and look at the mph that will tell the tale.

 

I agree but as the Manual says racing voids warranty how does that help him?

 

Well that’s his call, you could also take it to a dyno I don’t think that would cause any issue. AWD is not easy though

 

Never thought I would have to take a listed 710hp vehicle to the dyno to make sure it’s running at full potential…. I’m going to call the SRT hotline today and see if they have suggestions or thoughts on what I’m seeing/feeling.

 

Never thought I would have to take a listed 710hp vehicle to the dyno to make sure it’s running at full potential…

Do you remember the 1999 Ford Mustang Cobra debacle? Guys were taking their cars to the dyno and they were coming up way short. Ford finally recalled all of the 1999 Cobras due to low horsepower.

 

Do a normal standing start 1/4 mile and check your mph on the performance pages and compare to magazine tests with similar conditions.

 

The 707 number came from the engine being run on a dyno under I dare say "ideal" conditions.

Remember HP is derived from torque and RPM. If the RPMs are not high enough you'll never see the factory "HP". And in the case of the torque being displayed it too is a derived value possibly derived in part at least from the OBD2 "engine load" parameter.

Even if you managed to see 707 on the HP gauge given the engine is in the car accelerating considerable mass (approx. 4600lbs) and pushing "tons' of air and then there is the drive train loss the 707 number has to be derived and tweaked a bit -- some "correction" added -- to arrive at the 707hp number.

After break in I tried a few hard pulls with my Hellcat and never saw "707" hp. This does not mean the engine was performing sub par only that I just didn't have -- possibly -- the right conditions. Not sure even with the right or best conditions I could have managed to see 707.

With another car, fitted with (from the factory) turbos, nominal boost was 0.7 bar. Gave the car a few hard pulls and only managed to see 0.6 bar. Talked to the senior techs. They told me the engine controller seeks to produce the amount of torque demanded by the driver as signaled through the electronic throttle. If all it takes is 0.6 bar of boost that's all you will see.

Armed with this I picked a "better" location to try for 0.7 bar boost. An uphill grade with several miles of no freeway on/off ramps and no place for a CHP to hide. Also, I had a V1 in the car.

In 4th gear I floored -- and I mean floored -- the gas pedal. Speed built up very quickly but as RPMs rose I saw a solid 0.7 bar. But as RPMs got higher boost fell off a bit. Maybe because the factory called for 93 octane gasoline with 91 being ok but 93 was not available where I lived.

With the Hellcat there just wasn't enough room/road to subject it to the same "test". The turbo charged engine produced 420hp and the car began to eat up road at an alarming rate. The Hellcat and its 707hp would have gobbled up that section of road -- and it did -- with ease.

It is very rare for an engine to have a problem that limits its total output below that of what it should produce and not manifest other signs of this problem.

That I never saw 707hp from my Hellcat didn't bother me. I could tell -- butt dyno -- it had all the power it was supposed to have.

 

Great info, thank you. It makes sense what you posted. I just figured/hope I was down on power due to lack of "wow" factor. This is my first Hellcat motor, I'm coming from 3 SRT Jeeps (6.4l). I was always figured it was snap your neck power.

Part of my issue is my butt dyno is very underwhelmed. Maybe a turbo vehicle would have impressed me more. At the current moment I haven't been happy with the power since I took delivery. I'm just trying to cover all bases and gather as much information as I can. I was expecting a lot more "thrown into the seat" feeling and I'm just not getting it! Dead stop launch it isn't terrible, but I'm seeing only a few tenths better than my 6.4 was (disappointing). Once I get anywhere above 30mph and hit it, it's just not impressive to me one bit. Oh well....

 

My cat has never shown close to 700, closer to 600. always wondered if it was the car, the gauge or more likely that I'm at almost 6000 ft. I only get 9 pounds of boost and it looks like you're at 10. What is your elevation? Might be hard to do but if you could find another HC durango or TH you could use your " butt dyno" to see. I"ve never had an opportunity to drive another hellcat.

 

I'm going to see if I can drive a Trackhawk from a local SRT Group I'm part of. I've never driven any Hellcat vehicle aside from this one. I've heard very mixed results though. Some people are blown away, some people say the power is so smooth it's uneventful and not what they thought 710hp would be either (or whatever they make). It doesn't feel all that different from my old SRT. What's weird is shifting from 3-4 or 4-5 it almost falls on it's face during the shift. It's not smooth and freight train pulling through it like I imagined.

I grew up and still do ride extremely strung out 2 stroke motors with light switch powerbands. Maybe that's why I'm not overwhelmed. It's just completely different than what I pictured it being

 

Spoke with the SRT hotline, they told me to speak with the dealer. Spoke with the dealer, they seemed to think nothing is wrong as there’s no recalls.

Regardless I have an appointment next Monday

 

Good luck, keep us posted!

 

I have a 16 Challenger Hellcat which the display looks different but here’s what mine reads. Some mods yes but it was close to rwhp measured on the dyno, I would think a newer vehicle would be even more accurate?

 

 

I have seen 650 on my stock '15 Challenger M6

 

I’ve hit 700 on my Hellcat Durango and 780 on my Redeye charger.

 

I would not worry about the internal Dyno numbers one bit. They are certainly not accurate to begin with. I began reading this thread and decided just to post my own experience, so I haven’t read everything that has been stated.

The only way to get accurate dyno numbers is to take it to a dyno. I believe the internal dyno is simply for entertainment value.

Dyno numbers aren’t worth the screen/paper they’re printed on anyway. Unless it makes you feel better telling everyone what WHP/WTQ your car makes. Who really cares.

If you really care, take it to a track and run the 1/8th or the 1/4. Check your times and your trap speed. If the MPH is way low (much lower than 115mph) then maybe there is something to be concerned about. If you’re somewhere in the neighborhood (depending on DA etc) then I wouldn’t worry about internal dyno numbers, and just start enjoying the thing. I wish I had one honestly.

BTW - I didn’t see 707hp on the internal dyno until AFTER I modified mine (‘18 CHC; which I DO NOT recommend doing what-so-ever, unless you’re willing to potentially go on a life changing roller coaster ride). I rarely ever look but I happened to have had someone taking video one time after modding and was surprised to see exactly 707 so I took a screen shot. Not that exciting but again, this was seen AFTER modding heavily.

Hope this helps.

 

Trap speed in my Hellcat Durango was 105-108 on the 5 runs we did. Don’t ask the humidity etc I just know it was a 100 that day and with wife’s crappy reaction time she ran a 12.3-12.5. If you need pics of time slips I can dig them up.

 

The only way for us to get 3.4-3.6 0-60 is launching with 3-4psi using torque reserve. If I try to just leave at idle I see 4.0+ 0-60 and it feels weak. If using launch control move the RPM up more and see if it’s still acting the same. While foot braking or manually launching you can view the srt pages (boost gauge) in the dash or center console… just hold brake and quickly give it a little throttle until the idle changes then slowly feed more throttle until you see 4psi flicker (it doesn’t hold 4, I think 3.99 is max boost) then pull brake and smash throttle. It’s night and day for me.

 

This makes sense. Thanks.

I wonder if this also correlates to my intermittent power issue when hitting it at a speed of say 20mph. Sometimes it's fine, other times it feels underpowered. Maybe the boost just isn't building or something.

On another note. Should I build full boost at any speed when I put the pedal all the way down? Should it be instant full boost, or is it built up to max RPM?

 

Check to see if your sucking in oil. It will lower octane and pull trimming. Also pay attention to gas. My Redeye was only pulling 690 hp at sea level in cool air. I tried different fuel over a few tanks, and I finally hit 787 hp. I suspect a bit of bad 91 or some oil getting sucked in is causing the computer to pull trimming to protect. I’m waiting to get into my dealer as I’m getting detonation now, and I can’t pull over 700 anymore. My guess is im Sucking down to much oil. I burned 1.8 quarts in under 2k miles! Changed at 500 miles and was down almost two quarts by 2200 miles. I’m guessing oil consumption is the reason I can no longer make 700 hp. Dodge says oil consumption is normal for first 5k miles lol.

 

Great advice.

As I mentioned a few times on cruise control at highway speeds I've very briefly felt almost like a surge sensation. It was very very light but to me felt like a fuel issue or something. But if it's sucking more oil and pulling timing maybe that's part of my issue. I'm headed in for service on Monday and will have the oil changed as well.

I actually filled up with gas yesterday from nearly empty and I swear my exhaust tone is louder inside. Maybe I'm crazy, but it just seemed to drone more. Could be better gas?!

Now, I don't have a catch can. Good thing to buy? I've only used one once before in a previous life.

 

Keep in mind that your car should make advertised horsepower only at cool IAT/SC temps. For most people, this means from about 1 min - 2 min after starting the car. HP will decrease as underhood temps rise. Dyno shops force cool air into the intake to run around this fact. The internal kit on our cars is measuring real world application, where dyno testing produces numbers that are not realistic. Thus, the internal dyno software should always read lower than a plug in dyno test.

 

Good points.

The question I've asked before here is shouldn't my HP line measure over my TQ line on my graph? Regardless of on a dyno, or in performance pages. It seems most other Hellcats do this, but a few Durango owners have said there's wont either.

Just curious!

 

So I took the Durango out this morning to get a picture for you guys and now couldn’t get it to go over the 600hp mark lol. But from 500 miles on I can pull a 3.4 0-60 every single time without issues. If you aren’t at a 3.4-3.6ish then you have a problem otherwise I wouldn’t worry about it.

 

took the DDHC out this weekend since cool for us (75-80s) and while the graph displays lower, the srt hp widget in center displays 600ish before i had to back off pulling out in traffic. Maybe just a scaling issue or something else.

 

Is this the circular one?

if so, mine has only displayed 500 as the max under full acceleration to 90. Could be a scaling issue I guess. Going to dealer on Monday to make sure

 

Ok well I got some information.....

After going to my dealer (was helpful) and explaining what was going on they took a look.

Apparently there is a software issue with some of the Hellcat motors/Valet mode. The software bug can keep the vehicle in valet mode without knowing except there being a loss of power. The update/fix hasn't been released yet. But it does seem like this could be my issue...maybe... They did disconnect my battery but I honestly had no where to even try to open it up since it seems the entire state of MN was out driving today.

Edit: I just spoke with the SRT Specialist Group. Engineering is still working on this. It may be an OTA update or it may require you to go into the dealer to have the update completed. They're going to notify me once there's an ETA on the update as I opened a case on it.

 

Ok well I got some information.....

After going to my dealer (was helpful) and explaining what was going on they took a look.

Apparently there is a software issue with some of the Hellcat motors/Valet mode. The software bug can keep the vehicle in valet mode without knowing except there being a loss of power. The update/fix hasn't been released yet. But it does seem like this could be my issue...maybe... They did disconnect my battery but I honestly had no where to even try to open it up since it seems the entire state of MN was out driving today.

Edit: I just spoke with the SRT Specialist Group. Engineering is still working on this. It may be an OTA update or it may require you to go into the dealer to have the update completed. They're going to notify me once there's an ETA on the update as I opened a case on it.


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I'm glad they didn't blow you off as some crazy guy and are trying to figure it out. Not sure about the durango hellcat but in my 16 valet mode limits the car to around 300 hp and 4000 rpm, also cancels launch control and 1st gear in automatics. I tried it once in mine and it was pathetic. It would eventually get up to highway speed but it was more of a curiosity thing and to see if gas mileage improved but it didn't, at least as far as the real time computer said. Tried to verify 300/4000 in my owners manual but didn't find it.

 

So I did find this. Hopefully your ride is stuck in a semi valet mode cause I'm sure you would have noticed no paddle shifters etc.

 

your HP seems to high for valet and still low IMO but I might be nuts....

 

Been waiting in the Uconnect update since we purchased.. I wonder what the chances are of actually seeing any kind of update OTA or otherwise actually is.

 

SRT just called me on Friday, they still have NO ETA on when the update will be available. She was very apologetic about it. They were going to call me once it's available though. It'll likely be a dealer service.

 

The top pic … where it shows the dyno.,, I have the bottom pic with the circular one now do i get the top one I have a 2917