Chad05TL

On the left, AVG MPH = 72. Thats faster than 1 mile per minute.
On the right, 43 miles to go and will take 45 min to get there. That's slower than 1 mile per minute. hmm..

I also always notice that when you start out on a trip that is about 3 to 3.5 hours, the navi says it will take 4 hours. Then as you approach your destination, the EST remaining bumps up real fast. ha

ashkooly

are you sure the navi uses your avg mph to calculate that time left? that 72 mph was calculated based on the distance you went in the time that it has calculated. how fast were you going when you took the pic? the navi may base it upon an average of 60 mph (give or take) which is normally the speed limit.

Will Y.

The Navi probably takes into account the off-ramps, stoplights, lowered freeway speeds, street speeds and turns as well as the car's speed.

Tell us how long it took to get to the destination after you get there, and the difference between that time and the Navi time.

Chad05TL

well, it doesnt matter that much.. But I was doing 65 or over. I was on the highway. And I realize that navi could account for off ramps and stoplights but my mom lives about 2 miles off the highway in Tulsa. And i live in Dallas. So, i'm willing to give it some for that, but I'm leaning toward, "no it doesn't account for stop lights". Like how long is a stop light anyway? Someone has to program that into the calculation. But still 99.9% of the trip from dallas to Tulsa is HIGHWAY. How much really is in the calculation for stop lights. NIL!! It's not enough to through off the ETA as much as it does. So, I thought well, since I was sitting still when I programmed in the destination, maybe it jus tused a default 60mph to do the math. So, after I got on the highway, and passed all the stoplights in dallas, I cleared it out.. and input my destination once again. And it calculated the same thing! So it doesnt matter how fast you are driving! And even if you stop, the time stays the same.. So again, it no lookie at how fast you drive.. pretty suckie!! haha

ashkooly

yeah it seems like it calculates the same way mapquest would. they prob just use average speed limits or something to determine how long it SHOULD take you to get there if you drive exactly the speed limit.

01tl4tl

the nav has to use a base speed for initial calculations- which should adjust enroute based on your actual speed,,hit a traffic jam and it redoes the figures based on going 20 not 70, then redoes them again when speed resumes

It looks at how many miles on city street route and guesses ~30mph for 2 miles will add 2 minutes from freeway,,its pretty close
Your tire size affects the odometer/speedo which are often a few mph fast at speed anyway.
Acura has been that way for years- court cases to extend warranty 5000 miles due to error

the nav is taking measurements on time- to distance travelled between sat nav fixes to get current position and speed- thats happening every few seconds as you drive

Check the owner manual for more tricks it does, like adjusting AC for sun on one side of car based on nav positioning

RBeachTL

I'm not positive about the Alpine computer but I know that the NavTeq data base has the speed limits for the major roads. Garmin units use the speedlimit data to estimate travel time and my guess is that the Alpine unit does also.

timmahh

The MID is completely independent of the nav system, hence the reason non-nav cars have trip computers as well.

MID.AvgMPH = TimeSpentInVehicle / Speed


I would like to know how the hell you get 34mpg.

Chad05TL

no man.. it doesnt calculate on the fly in enroute. It doesnt change if you stop. you should just give it a real world trial.

Chad05TL

[quote=timmahh;11118782]The MID is completely independent of the nav system, hence the reason non-nav cars have trip computers as well.

MID.AvgMPH = TimeSpentInVehicle / Speed


I would like to know how the hell you get 34mpg.[/quote

Trip your computer on the highway.. and observe.

timmahh

^^^ I have.. always ends up around 23

Chad05TL

well.. mines just factory.. (for now).. not sure if that matters.

01tl4tl

sorry- Im gen2 and rely on how our car works- your nav is different-
mine is smarter than yours-- haha~

Chad05TL

49 and trolling already. how sad.

PhilB81

I thought it uses basic numbers depending on the road type your trip is on. Highway it uses something like 63mph big roads 45 mph smaller streets 35 and 20 ish for really small roads. My old navi system, a pioneer, you could configure what speeds it uses for all types of roads in the estimated arrival time calculation.

On a side note, dang dude you keep your car chilly enough??? I have mine set between 73 and 75.

Chad05TL

well, usually after I run it a while, I bump it up higher because the air just gets colder and colder.. but it may be possible yours works beter than mine? Dallas gets pretty hot and humid though. Climate has something to do with it too. PLus I like it cold in my car. But ya I do turn it up to 74 and sometimes off when it gets too cold. but when its down lower, the recycle stays on. And i dont like the the outside air. I wanna keep my car smelling as new as possible. Plus, when its up higher the fan doesnt blow much. I like it to blow a bit. and if it gets too cold, I just move the vent but keep it down low. So, theres a hundred ways to moderate the air that blows on you or not and how it feels depends on how cold the air is, how long the car has been running and outside climate and whether or not the vent is blowing directly on you. So, My temp fluctuates between 63 and 72. I also find that on my car, the difference between LO and 63 is just fan speed. So, the air isnt any colder at Lo, infact its a touch warmer because of all the air the fan is blowing over the coil or condensor, it wont cool off all that much air as well as if there is a slower flow of air going over the condensor. Its like the air flows slow and touches the condensor coils longer so it gets coldler than if a high volume of air is flowing over the coils. Its like a mathematical equation. X = the amount of cold available. and y=the amount of air it will cool. So too much Y just dilutes X. haha

Will Y.

Your Navi should calculate on the fly.
My TL's Navi does re-calculate and change ETA to account for speed and slowed traffic/jams. It's always interesting to watch the "time to go" increase from 14 min. to 20 min. when moving slowly in traffic, then see the ETA decrease quickly when the jam clears.

Chad05TL

in my picture above, it was a 3.5 hour drive, and I was down to less that an hour left, and it still had estimated too much time, and was not accounting for how fast I was driving. So IF it does account for being stopped at a stop sign, I've never noticed it. But I didnt stop on the highway either.. but mines an 05.. maybe the newer models are better about that.

Mattgtp

It does add time when stuck in traffic it just happed yesterday I was 22 min from home according to the nav but then got stuck behind a 3 car pile up on the highway and the time built up and after awhile it said 31km to go and 1 hour 31 min left lol...

LaCostaRacer

The Nav seems very conservative and almost always over-estimates the time remaining to destination especially if you happen to be speeding. It looks like the Nav uses a 50 mph or there abouts speed calculation for your trip even though you have been cruising at 70 for 4 hours.

I just do the math myself because the distance to destination is very accurate.

Chad05TL

The tollway in Oklahoma is 75 MPH. So, I'm not speeding. And If I did go over the speed limit on that trip to Tulsa, from Dallas, then it is/was usually less than 5mph. So basically you're saying that it does not calculate my speed into the math of how long it will take me to get there. cool.. thanks.. I knew that already.

Chad05TL

And to all the other guys on here.. if it does recalculate after A looonngg whiiilllle.. then ya maybe it might... but it still over estimates the time after recalculation.... so again.. wrong algorithm Acura!!

Its just wrong!! I'm right.. I already know it.. I dont want/need your explanation!!! haha

jtsangAZ

Yeah sometimes im like :wtf: with the navi. Then I arrive at the destination and I forget to calculate the navi estimated time vs. my actual driving time. Tonight I was driving down the mountain and was just coasting and I reset the Trip Computer and was averaging >50mpg lol. My 55 mile trip ended with about 28mpg.

PhilB81

He he, I understand what you mean about the temp settings, I have the vents blowing at me. My dad on the other hand has the air vents blowing in every possible direction except at him and he keeps his at 65 to 68.

As far as the estimates, on my car if I'm in town only only very rarely do I arrive to destination faster than the eta. The light cycles here in Clearwater are horrible. I can't tell you how often I catch several consecutive red lights.
On long trips it seems better because eventhough I travel faster, I stop for gas and food so that brings my average back down.

pokin

Yes, this is my experience as well.