Superchips Flashpaq for JK, Initial Impressions
JK Freak
Joined: Jun 2009
Posts: 707
Likes: 0
From: deep south
I am still sitting on stock 32s, about to be upgraded to 35s (hence the --> in my signature). Apologies if it was misleading.
So my suspension and tire size is still stock for the next 2 weeks.
The only performance deltas i have from stock are :
MBRP exhaust
Snorkel (RAM).
Don't get me wrong, i'd love to be able to run leaner like i do an airplane engine. But what we have here are highly subjective interpretations of performance.
I would love to get DYNO data for performance.
EGT data for leaner tune (and hence hotter).
If someone went to the trouble of doing that, it would be great to see the data.
For the Auto-transmission, i have no experience but wouldn't disagree if the shift-point RPMS come down a notch, ending up with higher MPGs.
So my suspension and tire size is still stock for the next 2 weeks.
The only performance deltas i have from stock are :
MBRP exhaust
Snorkel (RAM).
Don't get me wrong, i'd love to be able to run leaner like i do an airplane engine. But what we have here are highly subjective interpretations of performance.
I would love to get DYNO data for performance.
EGT data for leaner tune (and hence hotter).
If someone went to the trouble of doing that, it would be great to see the data.
For the Auto-transmission, i have no experience but wouldn't disagree if the shift-point RPMS come down a notch, ending up with higher MPGs.
The shop that did my lift and tire wheel install recalobrated my speedo to 35's' i checked my speedo with gps and was way off had to change them to 33.50, so i measure again' useing flat ruler across the top of the tire and measure to the ground,low and behold 33.50.
My points is my 35's are not true 35's but my 32 rubie stockers were only 30.50 so i still got a 3 inche taller tire from what is called 32 and what is called 35
Last edited by 08leocon; Oct 12, 2009 at 09:55 AM.
JK Super Freak
Joined: Jan 2009
Posts: 1,462
Likes: 3
From: Aurora, CO
Interesting. I'm at 5400' here around town and in the mountains I've been over 12000' with no pinging. I had light pinging once, but I think it was just a tank of bad gas. I filled it up at some no name rural station in the mtns.
Last edited by Atl JK; Oct 12, 2009 at 12:32 PM.
JK Freak
Joined: Sep 2006
Posts: 776
Likes: 0
From: Williamsburg, Va
As far as I can tell the MPG meter on the dash only displays the a rolling average over the last few miles and it doesn't do it very well at that because every time it updates the MPG value it only changes is small amounts.
At least on my JK, if I drive with a really heavy foot, the in dash MPG meter just ticks down slowly every few miles. If I then drive normally it continues to go down for a while, but a some point it starts to tick up very slowly.
It seems like the only time you can rely on the MPG indicator is when you are on a long trip and your speed and the terrain are pretty constant.
Am I missing something? Does the Flashpaq change this behavior?
At least on my JK, if I drive with a really heavy foot, the in dash MPG meter just ticks down slowly every few miles. If I then drive normally it continues to go down for a while, but a some point it starts to tick up very slowly.
It seems like the only time you can rely on the MPG indicator is when you are on a long trip and your speed and the terrain are pretty constant.
Am I missing something? Does the Flashpaq change this behavior?
JK Freak
Joined: Sep 2006
Posts: 776
Likes: 0
From: Williamsburg, Va
My impressions :
1) For auto-transmissions, you'll probably see slightly more mpgs because the shift-points get re-adjusted to lower RPMS.
2) For manual transmission, i don't see any difference by "allegedly" running leaner. Unless you have an exhaust gas temp gauge (like in piston - engine aircraft where you have to adjust your fuel-air mixture by altitude ), you can't tell if you're actually running leaner.
3) If the MPGs were really true and its purely software, Chrysler would jump at the chance to sell their jeeps stating 19 City, 24 Highway. They aren't doing that not because they're lazy but because this is snake oil.
Experience :
I have run this for the week on my 2007 6 Spd Rubicon and while the MPG gauge was claiming 24 mpg on the highway, the math worked out to the usual 20. Obviously its much easier to fudge the dash numbers than produce real performance or economy gains.
If anyone has put this on a DYNO and to an exhaust gas temp gauge, i'd like to see the data.
Humbly my $0.02
1) For auto-transmissions, you'll probably see slightly more mpgs because the shift-points get re-adjusted to lower RPMS.
2) For manual transmission, i don't see any difference by "allegedly" running leaner. Unless you have an exhaust gas temp gauge (like in piston - engine aircraft where you have to adjust your fuel-air mixture by altitude ), you can't tell if you're actually running leaner.
3) If the MPGs were really true and its purely software, Chrysler would jump at the chance to sell their jeeps stating 19 City, 24 Highway. They aren't doing that not because they're lazy but because this is snake oil.
Experience :
I have run this for the week on my 2007 6 Spd Rubicon and while the MPG gauge was claiming 24 mpg on the highway, the math worked out to the usual 20. Obviously its much easier to fudge the dash numbers than produce real performance or economy gains.
If anyone has put this on a DYNO and to an exhaust gas temp gauge, i'd like to see the data.
Humbly my $0.02
I'll speak to the auto tranny side of the tuning equation. It increases rpms in general. Which definately helps motivate my jeep. The only time it's decreased rpms has been it's ability to stay in od a little longer. The gas pedal definately became more sensitive after the tune. In a good way I might add. I can tell the difference under full acceleration on highway on ramps. I got the tuner primarily for tire calibration and code reading. I was expecting nothing out of the tune & was really surprised how different the shifting, and acceleration felt.
Thread Starter
JK Junkie
Joined: Jul 2008
Posts: 3,017
Likes: 0
From: Lakewood, OH
Also, if doing dyno tests, it's important to roll the vehicle around before executing your SC or other programmers tune. I would roll through a half an hours worth of spirited cruising and several freeway onramp blasts to hasten the PCM re-learn and have results that are meaningful.
JK Super Freak
Joined: May 2009
Posts: 1,509
Likes: 1
From: New Orleans, LA
Hey just curious to what people are running 285/70/17 Bfg Km2's at? PSI and size for the Flashpaq? I have mine set at 32.50 for the Flashpaq seems about right. Any suggestions on your use. I have also done the chalk test for psi running at 35 for street.
Thanks in advance
Thanks in advance
Thread Starter
JK Junkie
Joined: Jul 2008
Posts: 3,017
Likes: 0
From: Lakewood, OH
Hey just curious to what people are running 285/70/17 Bfg Km2's at? PSI and size for the Flashpaq? I have mine set at 32.50 for the Flashpaq seems about right. Any suggestions on your use. I have also done the chalk test for psi running at 35 for street.
Thanks in advance
Thanks in advance
JK Junkie
Joined: Jul 2009
Posts: 2,343
Likes: 1
From: The San Andreas Fault
Hey just curious to what people are running 285/70/17 Bfg Km2's at? PSI and size for the Flashpaq? I have mine set at 32.50 for the Flashpaq seems about right. Any suggestions on your use. I have also done the chalk test for psi running at 35 for street.
Thanks in advance
Thanks in advance
How is your ride? At 35psi my 35" KM2s start to feel like I am ridding on knobbies, although it sure reduces the rolling resistance.
JK Super Freak
Joined: May 2009
Posts: 1,509
Likes: 1
From: New Orleans, LA
My ride is fine with the PSI at 35, I took a level to the top of the tire at leveled it up and then measured from the ground to that point. I am somewhere in between 32.25- 32.50 for them. 
JK Junkie
Joined: Jul 2009
Posts: 2,343
Likes: 1
From: The San Andreas Fault
I currently only have the ProCal, and it take tire measurements to within a quarter of an inch, so maybe that is the threshold of the PCM.
This thread has convinced that the Flashpaq has the features that I am looking for. A few hundred posts ago on this thread someone jokingly posted that we were headed to 1000. I thought to myself: Yeah right, if it hits a 1000, I will buy a Flashpaq (something I was planning to do late late this year). I guess it is almost time to pay the piper.
