lostsoul Posted March 14, 2018 Report Share Posted March 14, 2018 I must be missing something .... according to "help" to calibrate ..... # of Teeth (26) / wheel diameter (0.61m including tyre ) x 31.83 = 1,334.1 ... to me this can't be right as I am getting a speed reading in the "thousands" kph with a calibration of 260 ?????? Car is a z32 300zx with the G4+ Thunder fitted ... factory wheel sensors. Quote Link to comment Share on other sites More sharing options...
MagicMike Posted March 14, 2018 Report Share Posted March 14, 2018 I ended up with a value of 131 (using GPS app for actual speed). I have 4.11 gears and 18in wheels. Quote Link to comment Share on other sites More sharing options...
lostsoul Posted March 14, 2018 Author Report Share Posted March 14, 2018 Thanks Mike ... gives me a starting point. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 14, 2018 Report Share Posted March 14, 2018 The calibration number of ~1300 should be correct for your setup. A bigger calibration number will give you a lower displayed speed. I suspect MagicMike's number might be from a gearbox sensor, not a ABS sensor? Quote Link to comment Share on other sites More sharing options...
lostsoul Posted March 14, 2018 Author Report Share Posted March 14, 2018 Thanks for clearing that up. What through me was the help section stating that the values would typically be 170 - 280 ... since my wheel sizes are typical and the ABS sensor wheels are factory ... well anyway you get the picture. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 14, 2018 Report Share Posted March 14, 2018 Yeah true that probably needs clearing up, those quoted numbers would be more normal for gearbox VSS type inputs. Quote Link to comment Share on other sites More sharing options...
MagicMike Posted March 14, 2018 Report Share Posted March 14, 2018 yes sorry, I am using factory gearbox sensor. I didn't think we could use the ABS sensors as wheel speed? Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 15, 2018 Report Share Posted March 15, 2018 59 minutes ago, MagicMike said: I didn't think we could use the ABS sensors as wheel speed? The OP has a Thunder which has some high speed DI's capable of ABS sensor frequencies. MagicMike 1 Quote Link to comment Share on other sites More sharing options...
Simon-AE86 Posted March 21, 2018 Report Share Posted March 21, 2018 on the same topic.. i have a G4+ red xtreme.. running latest firm ware. am i able to run nissan ABS sensors front and rear through two DI inputs? Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 21, 2018 Report Share Posted March 21, 2018 No, the Xtreme DI's are limited to 500Hz. common ABS rings with more than about 20 teeth will be too many for these. If you dont need ABS then you can grind some teeth off to make them work. Quote Link to comment Share on other sites More sharing options...
Simon-AE86 Posted March 21, 2018 Report Share Posted March 21, 2018 dammit Quote Link to comment Share on other sites More sharing options...
cj Posted March 23, 2018 Report Share Posted March 23, 2018 Any number of frequency dividers can be used to reduce ABS or high frequency gearbox sensors down to sub 500Hz levels. Dakota digital make a simple to use box that does this, but you can also build your own out of about $15 of parts from jaycar using a 4024 frequency divider chip (I have one on a modern honda gearbox reducing it by /16). If you put this divider between the point you splice into the wire and the ecu, you can leave the ABS in tact. FYI I also found in testing that the DI inputs can accept slightly higher than 500Hz - about 1300Hz (@12v) they go from reading ok to just reading 0hz until a few seconds after you bring the frequency back down. I wouldn't recommend using them like this though on purpose as i'm sure there is a reason Link dont recommend over 500Hz, but if you hit 501Hz briefly it will still register correctly. Quote Link to comment Share on other sites More sharing options...
Adamw Posted March 23, 2018 Report Share Posted March 23, 2018 1 hour ago, cj said: Any number of frequency dividers can be used to reduce ABS or high frequency gearbox sensors down to sub 500Hz levels Heres a cheap premade one that will work with most VR ABS sensors, I havent tried it on hall sensors though: http://www.vems.com/vr-to-hall.html Quote Link to comment Share on other sites More sharing options...
muzzytt Posted April 1, 2018 Report Share Posted April 1, 2018 I tried using that vems on my fury and didn't work very well at all. Got erratic readings from them Quote Link to comment Share on other sites More sharing options...
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