hacker-pschorr

Any truck stops in your area? Usually for under $10 you can weigh your car.


Whoa.....off to BB after work.

Jim R.

I like, got to get that for the I-Touch.

Jim

RicerSchnitzzle

The gPC and Dynolicous have no way to monitor rpms, so no torque numbers, only HP based on weight and g-forces.

There are 4 or 5 other I-touch/phone apps. All under $15. Track day is better than Dynolicous IMO as it stores vehicle data so you can swap vehicles without reprogramming. It also goes to the net to download vehicle weight, frontal area and drag coefficient etc.. Finally Trackday automaticcally uses GPS to determin when you've finished a lap and starts keeping lap times. Pretty cool for $12! Even if you have to buy the i-touch at $199, it's still cheaper than the G-tech and adds all of the othet I-touch features. But again no torque numbers.

Other I-touch programs for HP and 0-60, 1/4 mile times:
Dynolicous $12
TrackDay $15
G-tac $5
Gmeter $9
Rev-Lite - FREE!!
Test Track $3
All in the I-tunes app store.

I sent an email to Gpc to see if it's compatible with my G1. If so I'll give it a try and post results. I can then do a couple runs with the G-tech, I touch apps and Gpc together to compare.

123

I'm sure that the phone based types need you to have the phone secured somehow, but do you also need to have it level, or set in some particular orientation to get good results?

dr bob

Taake a look at the dynolicious website and get some of he requirements. Definitely needs to be secured, and as close to level at the start as possible. The calibration process takes care of minor stuff, but obviously the less correction neeeded the more accurate the results will be. Someplace I have a clamp on a post, old carphone style of mount that will do the trick if asked. Other options include adapting the suction-cup camera mount as shown in a couple of the demo videos. Leaving it sitting loose on the pass seat definitely won't cut it.

All the on-board accelerometer-type calculators require a similar solid mounting.

chaadster

Dynolicious also stores multiple vehicle profiles.

76FJ55

I recently started thinking about getting an accelerometer myself and ran across this comparison test last night. And then came on here and found this discussion today. in this comparison they actually have the trap data from the drag strip for comparison.
http://www.caranddriver.com/reviews/...s_work_feature
I didn't see a date on the article so I'm not sure how old it is for those who may have already seen it.

Z

I haven't ever used one of the performance meters at the drag strip to test for accuracy, but I have checked for consistency between two different G-Tech units. I wanted to see if there might be any possibility of results being skewed due to variations in individual G-Tech units when they're used to make any kind of comparisons to readings taken by other G-Techs.

One of the G-Techs I used for the test was maybe a couple of years newer than the other one. Both were stuck to the windshield right next to each other, and were used to measure the same run. I figured that any differences between the two units would be more apparent the longer that the run took to complete, so a 1/4 mle test was done in my Toyota. Below is the chart of a single run with the results of the two G-Techs that recorded it being compared by the software.

Tony

Z, you have any acceleration(g) data for those runs

Z

I sure do.




Here's a comparison of the Toyota to Tim's car too. The time for Tim's car in the 1/4 mile is close to the Toyota's time for the 1/8 mile.