Thread: Is my GPS working right ?????
10-30-2010, 11:57 AM #1
Is my GPS working right ?????
After installing a full RIVA Stage 2 kit plus some other mods I GPS'ED my ski and I only got 72MPH. I couldn't believe it because people like Jerry when he were running the C3 at 74MPH and I'm running an E1 with the stock intercooler upgrade. So I thought something was wrong with my ski. Then I read over his built thread and saw that his etrex was reading 77MPH while his MoTec GPS was reading 80.1MPH. So this morning I took my GPS on the highway and carried the speed up to 160KPH and the GPS read something like 94 MPH. I now that 1mile=1.6km's and that the GPS was supposed to be reading 100MPH. Could it be that my GPS is off ??????
10-30-2010, 12:01 PM #2
if its a garmin etrex then yes as i had the same problem, when i tested it in a few different cars at the same speed of 60mph the garmin showed 54mph
10-30-2010, 12:07 PM #3
What are your RPMs? What prop/ pitch? Please list all of your mods. It can be tough to compare your ski to someone else, especially a pro like Jerry. Remember, every ski is different and will respond differently to various mods.
I run an etrex venture HC and I have no issues with it.
10-30-2010, 12:13 PM #4
10-30-2010, 12:17 PM #5
10-30-2010, 12:17 PM #6
10-30-2010, 12:19 PM #7
I highly recommend you invest in a tach. It will make the tuning process a lot easier.
10-30-2010, 12:22 PM #8
10-31-2010, 05:49 AM #9
10-31-2010, 06:08 AM #10
- Join Date
- Oct 2006
car speedos are NOT accurate either, they generally read a little slower as a safety thing.
I would believe GPS reading over a car speedo anyday unless its an after market one that's calibrated correctly.
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