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Forum: General Challenger Discussion   11-26-2014, 06:16 PM
Replies: 62
Views: 1,357
Posted By randycat99
One little enhancement that could substantially...

One little enhancement that could substantially improve the utility of the EVIC, is if it let you enter in a parameter for tire OD roll-out down to say, a 16th of an inch or something. That would be...
Forum: General Challenger Discussion   11-26-2014, 01:29 PM
Replies: 62
Views: 1,357
Posted By randycat99
I think we are in agreement. Depending on the...

I think we are in agreement. Depending on the numbers you run, it physically may not be possible just from the math, and even if the numbers say it is possible, it's so close that other effects not...
Forum: General Challenger Discussion   11-26-2014, 12:22 PM
Replies: 62
Views: 1,357
Posted By randycat99
I'm talking about when you *actually* reach 60...

I'm talking about when you *actually* reach 60 mph. For all we know, the system "thinks" you hit 60 mph, but in reality, it captured a time value for a 0-58.772 mph run. As far as the calculation...
Forum: General Challenger Discussion   11-26-2014, 11:52 AM
Replies: 62
Views: 1,357
Posted By randycat99
Digging even further, how does the "timer" start,...

Digging even further, how does the "timer" start, anyway? What is the trigger? Does it look for motion to register in the rear wheels (which is obviously prone to faultiness from launch slip)? ...
Forum: General Challenger Discussion   11-26-2014, 10:58 AM
Replies: 62
Views: 1,357
Posted By randycat99
It's the stack-up of all of these effects that...

It's the stack-up of all of these effects that can be enough to throw off what you are expecting just from the mechanical gearing numbers. Just .5 mph error from one effect is significant, because...
Forum: General Challenger Discussion   11-26-2014, 10:23 AM
Replies: 62
Views: 1,357
Posted By randycat99
I agree with all of the effects you are noting. ...

I agree with all of the effects you are noting. Additionally, there is just the plain fact that tires also deform a bit under load, and even when not under load, the physical dimensions are not...
Forum: General Challenger Discussion   11-26-2014, 10:13 AM
Replies: 62
Views: 1,357
Posted By randycat99
It's possible it may not even show up on the...

It's possible it may not even show up on the speedometer, due to high-frequency filtering...the thing that gives the needle a smooth reading and motion, as opposed to the needle twitching erratically...
Forum: General Challenger Discussion   11-26-2014, 10:07 AM
Replies: 62
Views: 1,357
Posted By randycat99
If you're going to do all that, might as well...

If you're going to do all that, might as well just rig up a proper 5th wheel for speed measurement, right? That would be the reference (actual) speed measurement. Then the speed measurement from...
Forum: General Challenger Discussion   11-26-2014, 09:05 AM
Replies: 62
Views: 1,357
Posted By randycat99
"Silent spin" is an interesting avenue to...

"Silent spin" is an interesting avenue to explore, for sure. That would be yet another layer of potential speed inaccuracy to effect both transmission types, even when it appears that the run should...
Forum: General Challenger Discussion   11-26-2014, 07:58 AM
Replies: 62
Views: 1,357
Posted By randycat99
Ok, wheelslip from 1st to 2nd may occur, but is...

Ok, wheelslip from 1st to 2nd may occur, but is it enough to get an EVIC reading all the way out to 60 mph? I didn't know it could be to that extreme, but maybe, if that is what you have...
Forum: General Challenger Discussion   11-26-2014, 07:37 AM
Replies: 62
Views: 1,357
Posted By randycat99
I thought the misread times in EVIC issue is only...

I thought the misread times in EVIC issue is only in the context of manual transmission cars. It's only because the 2nd to 3rd shift is unfortunately right smack in that 60 mph region.

On the...
Forum: General Challenger Discussion   11-25-2014, 10:41 PM
Replies: 62
Views: 1,357
Posted By randycat99
Ah, good point! I didn't know there would be a...

Ah, good point! I didn't know there would be a fine distinction like that. I (wrongly) thought it was being reported that all speed sensing is now happening up front.

That definitely sounds...
Forum: General Challenger Discussion   11-25-2014, 09:39 PM
Replies: 62
Views: 1,357
Posted By randycat99
Could just jack up the rear, run some rpm to the...

Could just jack up the rear, run some rpm to the wheels, and see if the speedo changes, at all. If it is dead at 0 mph, no matter what you do, then it seems safe to say the sensors are reading the...
Forum: General Challenger Discussion   11-25-2014, 09:09 PM
Replies: 62
Views: 1,357
Posted By randycat99
Momentum mostly deals with mass and velocity in a...

Momentum mostly deals with mass and velocity in a constant energy state scenario.

m1 * v1 = m2 * v2

Since we can assume the mass of a Challenger is going to be more or less constant, then...
Forum: General Challenger Discussion   11-25-2014, 08:41 PM
Replies: 62
Views: 1,357
Posted By randycat99
Momentum cannot be the explanation. At best, you...

Momentum cannot be the explanation. At best, you maintain your original speed via momentum. Your speed does not increase. More likely, you lose speed gradually from frictional losses bleeding down...
Forum: Wheels, Tires, Brakes, and Suspension   11-25-2014, 07:40 PM
Replies: 10
Views: 288
Posted By randycat99
Most popular tire size on SRT8?

I'm just curious...what do you think is the most popular tire size spec that owners gravitate to on the SRT8 (20" wheels)? Stock size in the rear is 255/45R20?
Forum: General Challenger Discussion   11-25-2014, 07:36 PM
Replies: 62
Views: 1,357
Posted By randycat99
That part puzzles me! If you're coasting, how...

That part puzzles me! If you're coasting, how can your speed increase? I'm not saying you did not experience what you experienced. I'm just wondering if there is more stuff going on than expected,...
Forum: General Challenger Discussion   11-25-2014, 06:20 PM
Replies: 62
Views: 1,357
Posted By randycat99
I think that is the problem, right there (for the...

I think that is the problem, right there (for the pre-2015 models with speed sensing on the rear wheels)...it's such a close margin to hit 60 in 2nd, you either have the next shift timed perfect, or...
Forum: General Challenger Discussion   11-24-2014, 08:10 AM
Replies: 9
Views: 492
Posted By randycat99
This is a multi-clutch pack transmission design,...

This is a multi-clutch pack transmission design, not a SMG. Hence, you really don't need to worry about the "shift speed" on these automatics. There may be a finite time where one clutch pack hands...
Forum: General Challenger Discussion   11-22-2014, 10:54 PM
Replies: 23
Views: 707
Posted By randycat99
I got a Zoom H1 a few weeks ago. Just now...

I got a Zoom H1 a few weeks ago. Just now thinking of neat stuff to try with it. :)
Forum: General Challenger Discussion   11-22-2014, 07:59 PM
Replies: 23
Views: 707
Posted By randycat99
I made some more underhood sound clips, today... ...

I made some more underhood sound clips, today...

This one has some length to it, so you can really zone in and pick out details to the sound.
after cold start, near driver side valve cover...
Forum: General Challenger Discussion   11-22-2014, 11:16 AM
Replies: 23
Views: 707
Posted By randycat99
Are you saying the part of the sound you can hear...

Are you saying the part of the sound you can hear in the recording has a higher pitch, or are you saying that the sound you are looking for has a higher pitch than anything that is apparent in the...
Forum: General Challenger Discussion   11-22-2014, 10:19 AM
Replies: 23
Views: 707
Posted By randycat99
For those who are hearing things like an "ominous...

For those who are hearing things like an "ominous metal on metal sound", all the way into the cabin while driving, it's not out of the realm of possibility that maybe you just have a collapsed/bad...
Forum: General Challenger Discussion   11-22-2014, 09:55 AM
Replies: 23
Views: 707
Posted By randycat99
I would say none of those noises get to the cabin...

I would say none of those noises get to the cabin while driving. While the windows are up, fuggeddiboudit! There is only the faint sound of an engine running, and it's really the exhaust from the...
Forum: General Challenger Discussion   11-21-2014, 11:43 PM
Replies: 23
Views: 707
Posted By randycat99
Sound clips are second class citizens in the...

Sound clips are second class citizens in the internet world! :p Anything'll play any video, these days, but simple thing such as a sound clip...evidently that is just too weird to handle. ;)

Does...
Showing results 1 to 25 of 249

 
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