[Red-key]

Lately I've been noticing in the last two track days (last Friday and just yesterday) that my car seems to be running slower down the 1/4. On a Test n tune night I usually average three to 4 runs and have my car off with the hood open in-between runs for about an hour to an hour an a half to cool down.

Usually on my last run of the night I would run my best time (as it gets cooler) but lately it's been my worst time running a second or so slower and a slower 60 ft as well as my trap speed decreased.

Last week when this happened I thought it was because my car was cooled down for too long for a little over 2 hours and not running at optimal temps to perform. So this week I tried to make sure it was not off for too long to not be too cool if that makes sense. A little trial and error I was doing here but the results were no different and still seemed slower.

I know my car pretty well and had a lot of seat time racing it. I've always been consistent on how I launch it with great results but just noticing it lately that it doesn't seem to run as good as it usually does especially on my last run of the night.

I'm going to take it to a good performance shop that I know for a full vehicle inspection but I'm not sure exactly what needs to be checked in order to see why my car is running inconsistently?

Is there anything in particular that needs to looked at to see what's going on??

 

[baabootoo]

Slower as in ET or MPH?

 

[hell on wheels]

I keep the hood closed.

keeps the heat in the motor helps the car

be more consistent. I’m just an ET bracket

racer though.

 

[Red-key]

Slower as in ET or MPH?

Slower in almost everything, like my ¼ time, 60 foot, and trap speed.

 

[Red-key]

I keep the hood closed.

keeps the heat in the motor helps the car

be more consistent. I’m just an ET bracket

racer though.

Interesting, why keep the hood closed and trap all in the heat in it? Does it really keep your times more consistent? I have the race cool down feature on my car and have to keep the hood closed or at least ajar for it to be activated and then after the race cool down fans are done cooling I’ll leave my hood up.

 

[SuperDuperStock]

What are the good numbers versus the bad numbers? I'm very interested in this behavior.

 

[16GoManGoHC]

Leak down test the motor, it’s my first go too. Biggest least invasive glimpse inside the motors heart possible, just seeing the plugs as they come out will tell you allot, leak down will tell you the rest. I do it at least once a year.

 

[Vet Rider]

What year and model. Sounds like the dreaded cat over temp kicking in. Car goes rich and bleeds boost. When my new charger did it I was down 10mph trap and a second.

 

[hell on wheels]

If your power chiller is not activated

(Temps below 55 degrees)

your times may be different than when it is

activated.



This is what I do to get the car to be

consistent.


I keep an eye on the IC temp the one on the in-

dash cluster I try to keep this number close or

the same as my previous pass. I log this

number.

I also shut the motor off and restart as I

advance through the staging lanes (to keep the

motor cool) till there

are about three

to four cars left that are ahead of me in the

lanes. Then start the motor and keep it running

(takes a few minutes)

To let the power chiller bring the IC

temp down shown in the center cluster gauge

before I enter the water box.

I do the same length of burn out

then shallow stage the car and time my roll out

with the lights.

I leave on the second yellow just before it

goes out. To be competitive at the light .020 or

better.

(It’s not easy)

 

[Under-Pressure]

Interesting, why keep the hood closed and trap all in the heat in it? Does it really keep your times more consistent? I have the race cool down feature on my car and have to keep the hood closed or at least ajar for it to be activated and then after the race cool down fans are done cooling I’ll leave my hood up.

This item works great for cooling down with the hood open.

Challenger 18-23 Demon/Redeye Race Cool-Down Mode Override

This is our new Dodge Challenger race cool-down override button. This allows your cool-down mode to work if and when the HOOD IS OPEN!! Not drilling or removing stock parts, this product allows the factory sensor to remain down while looking stock. MADE IN USA Product Fitment: 18-23 Dodge...

zl1addons.com

 

[hell on wheels]

I don’t use the cool down feature
it just eats battery.
I forgot to add this to my
Previous post.

 

[CPO Super stock]

with out times and DA to compare it is hard to help.

 

[Red-key]

What are the good numbers versus the bad numbers? I'm very interested in this behavior.

For example, last week I was consistently hitting 10.9’s at 125 mph on my first 3 runs and the last run was a high 11.0, almost an 11.1 at 124 mph. My first three 60 foots were averaging around 1.61-1.60 while the last run was at a 1.63.

Last night I was also hitting a couple of 10.9’s at 125 mph. My 60 foots were averaging around 1.58-1.59 but my last run was at 11.1 at 124 mph with a 1.64 60’ which I felt was quite odd.
For what it’s worth my Hellcat is bone stock with just MT drag radials on 17’s.

I can understand DA and air temps can be a factor but it always gets cooler later in the day here and I always run the same tire psi and launch methods as usual, nothing else different. It’s just made me wonder a bit as to why all of sudden after hitting 10.9’s on the same nights, the car would start to be slower to an 11.0 or 11.1 on the last run even with enough time to cool down before each run.

 

[Red-key]

Leak down test the motor, it’s my first go too. Biggest least invasive glimpse inside the motors heart possible, just seeing the plugs as they come out will tell you allot, leak down will tell you the rest. I do it at least once a year.

This is interesting thanks for bringing it up. I will look into this as well. Is this something you do on your own or can you request this from a shop to check for you?

 

[Red-key]

What year and model. Sounds like the dreaded cat over temp kicking in. Car goes rich and bleeds boost. When my new charger did it I was down 10mph trap and a second.

2019 Challenger Hellcat. I’ve had it for a year and a half and been tracking it quite a bit but been noticing this recent behavior of it being slower on my last and final runs of the night at the track. I’ve recently have brought it to the dealership for them to do a full inspection of the car and everything seemed to check out fine by them. Maybe it would need more extensive checking or tests to diagnose the issue. I’m not quite sure.

By the way I noticed you been having issues with yours and I’m sorry to hear that. I can understand it makes you miss your previous car much more. I hope you get your issues sorted out.

 

[Red-key]

If your power chiller is not activated

(Temps below 55 degrees)

your times may be different than when it is

activated.



This is what I do to get the car to be

consistent.


I keep an eye on the IC temp the one on the in-

dash cluster I try to keep this number close or

the same as my previous pass. I log this

number.

I also shut the motor off and restart as I

advance through the staging lanes (to keep the

motor cool) till there

are about three

to four cars left that are ahead of me in the

lanes. Then start the motor and keep it running

(takes a few minutes)

To let the power chiller bring the IC

temp down shown in the center cluster gauge

before I enter the water box.

I do the same length of burn out

then shallow stage the car and time my roll out

with the lights.

I leave on the second yellow just before it

goes out. To be competitive at the light .020 or

better.

(It’s not easy)

Hmm, I don’t have the power Chiller on my car since it’s the standard Hellcat. I believe those are on the Redeye’s only. Mine is a 2019 so it just has the race cool down feature where you hear the fans run when the car is off once you activate them.

 

[Red-key]

This item works great for cooling down with the hood open.

Challenger 18-23 Demon/Redeye Race Cool-Down Mode Override

This is our new Dodge Challenger race cool-down override button. This allows your cool-down mode to work if and when the HOOD IS OPEN!! Not drilling or removing stock parts, this product allows the factory sensor to remain down while looking stock. MADE IN USA Product Fitment: 18-23 Dodge...

zl1addons.com

Oh neat thanks for sharing. I will look into that.

 

[Red-key]

with out times and DA to compare it is hard to help.

with out times and DA to compare it is hard to help.

These 4 runs were from last week all in order.

These 3 runs were from last night and all in order as well. I'm not sure what the DA was, sorry I know not much help.

 

[CPO Super stock]

your differences are almost 100% in your 60 foot. It could be track conditions are going away by the end of the night.

 

[666216Cat]

Slower in almost everything, like my ¼ time, 60 foot, and trap speed.

post the time slips