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2013 Challenger SXT
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Discussion Starter #1
I would like to help close this gap thru information.

Each and everyone of us live in a different part of the country or world, we compare
what we have done and give advise to others. I go to one track and someone else goes
to another track, so if I have more mods and I'm slower then the other, I must have
done something wrong- right?, Well hold on, it's just more then that, you can't
just compare your timeslip to mine, let's put it on a level playing field.

If ONE challenger 3.6 runs a 14.5 second e.t and is stock and the rest of us
do something to our cars and it runs 15.5, then we must have done something wrong
or that mod is a waste of time or something else negitive.

We ALL are now compared to the ONE car that ran 14.5, then all you hear is, "well all
stock 3.6 challengers run low to mid 14's" really? Most cars seem to run low 15's
high 14's in the world I live in.

This is what I have taken from this board since I joined last year after buying my sxt,
many folks on this board believe all challengers sxt 3.6 cars run low to mid 14's "stock"
and if your slower then this- you have no clue to nothing and get treated as such,
seen several comments on this, many beleive mods are no good, many believe
you must have tuner to do anything, many believe it's all a waste of time
and money and anyone who does anything to show different is attacked
and basically is told your full of it.

So what I wanted to share is what the NHRA uses to correct e.t. and mph
at different parts of the country, brings everything down to sea level.

I think there are some folks on here that lack the understanding in comparing
each other cars and might shed some light if mods do work as some claim.


How fast is your car?
How fast is your friends car on the other side of the country?
The NHRA uses a correction factor to compensate for altitude for stock/super stock classes.
Many automotive tests also use this factor when giving 1/4 miles stats. This way you could run a car at sea level and have an identical car running at 6000 feet. The car running at 6000 feet will be considerably slower but by using the conversion factor you would see they run the same. Just because someone says they have a car that run's low 13's doesn't mean much against yours unless they are on an equal playing field.
If you really want an accurate conversion, then do your calculations with density altitude. A car running on a high density altitude at sea level will be slower than than same car running on a low density altitude at 3000 feet elevation.
Race City has an altitude of around 3500 feet.
NHRA Altitude corrected index in Calgary is S/ST = 11.27, S/G = 10.24, S/C = 9.20
Comp, Super Gas, Super Comp and Super Street conversion
Here's how you do it: Simply multiply the elapsed time factor below times your ET or MPH.

ET Example: 16.1 x .9692 = 15.60412 corrected ET
MPH Example: 84 x 1.0325 = 86.73 corrected MPH

To find the elevation of the track where you drag race, check out the Geographical Nameserver. Enter the city, state and the server will find the info for you.

and the altitude converters:
Altitude(ft) ETFactor MPHFactor
1200 .9874 1.0129
1300 .9861 1.0143
1400 .9848 1.0157
1500 .9835 1.0171
1600 .9822 1.0185
1700 .9809 1.0199
1800 .9796 1.0213
1900 .9783 1.0227
2000 .9770 1.0241
2100 .9757 1.0255
2200 .9744 1.0269
2300 .9731 1.0283
2400 .9718 1.0297
2500 .9705 1.0311
2600 .9692 1.0325
2700 .9679 1.0339
2800 .9666 1.0353
2900 .9653 1.0367
3000 .9640 1.0381
3100 .9627 1.0395
3200 .9614 1.0409
3300 .9601 1.0423
3400 .9588 1.0437
3500 .9575 1.0451
3600 .9562 1.0465
3700 .9549 1.0479
3800 .9536 1.0493
3900 .9523 1.0507
4000 .9510 1.0521
4100 .9497 1.0535
4200 .9484 1.0549
4300 .9471 1.0563
4400 .9458 1.0577
4500 .9445 1.0591
4600 .9432 1.0605
4700 .9419 1.0619
4800 .9406 1.0633
4900 .9393 1.0647
5000 .9380 1.0661
5100 .9367 1.0675
5200 .9354 1.0689
5300 .9341 1.0703
5400 .9328 1.0717
5500 .9315 1.0731
5600 .9302 1.0745
5700 .9289 1.0759
5800 .9276 1.0787
5900 .9263 1.0787
6000 .9250 1.0801

this should be useful in comparing times since it levels it all and takes away the altitude differences.

There is a board member here that ran like 14.57 @94.59mph stock 3.06 rear geared
challenger with a drop in K&N filter, this was like in -500 DA when corrected to
sea level this is a 14.70 @ 93.55 mph pass, I'm not trying to take his 14.57 pass away, damn
good run is some good air. These kinda condition are much harder to have
in other places.

Take my last run of the year last year and plug it in. 14.96 @ 95.85 mph
with a 2022 ft DA, thats corrected to 14.57 @ 98.16 mph.

14.57 @ 98.16 mph for a car with no tuner, with modded cai, tb, intake manifold
some heat management and solo catback on top of that, car is heavier
and running 2.65 gears.

So most would say ya you spent all that time and money and the e.t.'s
are about the same, what most don't look at is the MPH.

What is mph, the sign of power

( what everyone asks for on this board-
"how much power will it give me" or "How much hp will I gain")

e.t. is only how efficently one was able to use the power. looking at my timeslip, making lots of power
but not using it very efficiently- lack of gears/stall being one.

So how do you explain the 4.6 mph gain over the "stock" car, simple MODS WORK

Look at the start of the year and end of the year, I was able to gain almost
3.5 mph trap speed, just by heat management, solo exhaust, porting intake,
much larger air filter, by now already went to synthetic oil, engine a little looser
( broke in maybe).

Tell me what it takes in HORSEPOWER to gain that kinda trap speed something
around 30 to 35 hp to get that kinda trap speed increase.

It's a difficult balance as I said in many posts, keeping low end torque and building high end horsepower.

During my mods and testing I was at a point where my corrected e.t. was around 15 seconds flat
but had a trap speed over 99 mph. making lots of hp but lack of gears/stall ate up the clock.

Everyone talks about, well how much hp does this mod make or that mod make, I give an answer
then get called out on it, then get slammed because my car "only" runs 14.96, E.T. will
drop once I start working on the e.t., Ive been working on how to build power (mph)
E.T. will drop big time with stall and some sticky tires, even with crappy 2.65 gears.
And still have no tuner.

So hopefully this will teach something to some and give a better understanding when comparing
timeslip, put it on a level playing field ( it's not perfect but darn close) so
we all can compare different mods in different parts of the world.

Hope this was helpful
 

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Short answer....

Depends.

1. Blowers- YES!
2. CAM's- YES...but with complications....and less than blowers.

3. Exhaust systems/tune....Yes....but much less than people think. The breathing system of RT/SRT is already efficient.

Best bet: Blower. Big gain. No other mods needed, except for TUNE. All mods NEED TUNE...or they are USELESS.
 

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http://www.dragtimes
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A lot of us go here. It does the calculations for you and has three categories (stockish, lightly modded and heavy modded)
DA Calculator - Density Altitude Calculator - DragTimes.com

It has most of the tracks in the US and their elevations. It also allows you to put in the date and it gives you the temp, humidity & baro pressure in ~30 minute intervals. Form there you enter your ET & MPH and it will give you your corrected #.
Yes, if everyone standardized on corrected DA times it would level the playing field. As far as the mods go, some will help more in high elevations or high temps more than others.
 

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problem with DA correction, it does not take into account that more HP leads to hook problems with street cars. So it basically give an unrealistic gain for higher altitude cars. This not as bad for cars running slicks on prep tracks.... I do agree that MPH is what really is important.

30 to 35 HP is great and out side of a tune looks like you got all the low hanging HP fruit for the 3.6. A stall and some 3.64 gears / DRs will get your times into the low 14s and with tune 13s; and that should put you into the top of the fast NA group and even the lightly supercharged 3.5 group. which is awesome for a DIY setup.

Also I don't know where you get the norm is 14.5s the car runs about 14.75 at 94 to 95 MPH for a good runner and low 15s for some. My 3.5 was 15.70 at 90 to 91 and for some reason some have been a whole lot slower to 16.0 at 89 MPH dunno.
 

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Turbo stickers on the hood are good for 50HP...I now I dynoed mine after sticking them on
 

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I guess I'll say I'm one of the least knowledgeable folks here to respond to this thread. So be easy on me.

I bought an '09 S/E and installed a K&N CAI and a Diablo tuner. To be totally honest, I was underwhelmed. Maybe if I took the car to the track, I might have seen a few tenths gained, but for everyday driving...Not so much. Besides it was costing me $5 more to fill up because I was married to 93 octane gas.

I now own a '13 Challenger SXT and appreciate the bump in HP the 3.6 has, but I'm real hesitant to buy another tuner again for a V6. Maybe the V8 folks feel more seat of the pants gains?
 

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I guess I'll say I'm one of the least knowledgeable folks here to respond to this thread. So be easy on me.

I bought an '09 S/E and installed a K&N CAI and a Diablo tuner. To be totally honest, I was underwhelmed. Maybe if I took the car to the track, I might have seen a few tenths gained, but for everyday driving...Not so much. Besides it was costing me $5 more to fill up because I was married to 93 octane gas.

I now own a '13 Challenger SXT and appreciate the bump in HP the 3.6 has, but I'm real hesitant to buy another tuner again for a V6. Maybe the V8 folks feel more seat of the pants gains?
Takes a lot to get a 09 to go... dual exhaust, 3.9 gears, headers, port TB and intake, cams, converter 245 / 45 sticky Nittos.... we had the 1/4 mile database somewhere, I forget how fast all that was... It was kinda impressive considering the at best 15.7 it does stock. very high 14s AFAIK. It would be cool to see Dennis do a 13.9 on the engine with the new 3.6 and mostly homemade mods.
 
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