Anybody use a chassis ear or NVH software. My shop desperatly needs something to pick out vibration and growls. Working on big trucks so Pico NVH is out (no support for J1939). I'm looking at a steelmann set up but would like some feed back.
Got an NVH case study coming up on my Silverado. Had a vibration after lift kit install. I'm going to make it the final part to that series.
Maybe I'll get time to edit that one in the next few weeks.
But it will be with the pico NVH
Sweet!!! I'd love for my shop to pick up a Pico and NVH software and have been trying to sell the service manager on it. Then he transferred stores. Branch manager was getting on board till I quoted him the price of Picoscope's setup and the fact we would need 1-2 guys only trained on the NVH side of it.
Not having a way to plug into the DLC means grabbing a crank sensor, and VSS pulse to tell the scope engine and vehicle speed. I'm down to get it a hell of a try, but I have not been successful in getting the idea sold.
I've spoke with one of the guys as AES about the incorporation of a J1939 DLC adapter and was told at this time there was no help on big trucks. And there should be. These guys spend 11hrs a day behind the wheel and a vibration or growl will drive these guys batty.
Andy.MacFadyen wrote: I tried making an home built setup using cheap guitar pick-up contact microphones but it didn't work the scope didn't pick-up any signal.
That's cool, I've always wondered if I could make a set up with knock sensors.
ScannerDanner wrote: Got an NVH case study coming up on my Silverado. Had a vibration after lift kit install. I'm going to make it the final part to that series.
Maybe I'll get time to edit that one in the next few weeks.
But it will be with the pico NVH
Awesome! :woohoo: I've been hearing a lot about this Pico NVH kit on AESwave and iATN, can't wait to see how it goes.
Noah wrote: That's cool, I've always wondered if I could make a set up with knock sensors.
That reminds me, I heard from a class recently about using a knock sensor to detect fuel injector problems... I have no idea if there's any merit to this concept, but I'm willing to try it!
Ones of my ideas with the clip on acoustic guitar microphone was to clip it round the injector and look at the sound signature but it just didn't work , no signal nothing from the mike. I am now thinking if I added a 5$ pre-amp it might work.
EDIT
I found the guitar mikes this morning and tried again, something must have be wrong with the connection the last time as this time with the mike clipped to the injector body I got lots of signal but making sense of it is a different matter.
There is a visible difference with the injector disconnected but to be useful it would need synched to the ignition or an injector as there is a lot of echoes the other injectors.
Until I try synching it, adding a filter and getting that to work I can't see any advantage over using a stephoscope.
The idea of using a knock sensor might work better as it is designed to work on a narrower band of frequencies.
" We're trying to plug a hole in the universe, what are you doing ?. "
(Walter Bishop Fringe TV show)
I'll be getting the NVH 4 axis kit in 3 days, I will post some pics here and a video on youtube! I can't wait to get it! I have already 5 cars waiting to be diagnose with this equipment, PICO is the best! John Kelly in the Weberauto channel in youtube has some very good info of the NVH from PICO and he has develop an app that uses the Iphone accelerometer for vibrations and so on, that is very impressive, a little pricy $400, but for those who can afford the whole Pico set up ( lap top, picoscope, NVh and some J2534), is great!
Pico NVH video
Andy.MacFadyen wrote: Until I try synching it, adding a filter and getting that to work I can't see any advantage over using a stephoscope.
The idea of using a knock sensor might work better as it is designed to work on a narrower band of frequencies.
Awwwww, sorry to hear that didn't work out!
I like the knock sensor idea, too. The only problem is most knock sensors are expensive-ish, at least $50. Not the worst gamble I've ever made, but not cheap, either The last two knock sensors I replaced on the job were electrically open, so no luck there.
maicsa2 wrote: I'll be getting the NVH 4 axis kit in 3 days, I will post some pics here and a video on youtube! I can't wait to get it! I have already 5 cars waiting to be diagnose with this equipment, PICO is the best! John Kelly in the Weberauto channel in youtube has some very good info of the NVH from PICO and he has develop an app that uses the Iphone accelerometer for vibrations and so on, that is very impressive, a little pricy $400, but for those who can afford the whole Pico set up ( lap top, picoscope, NVh and some J2534), is great!
Pico NVH video
Please let us know what you think of the Pico kit!
I would love to play with that NVH app, too, but no Android support Still, amazing use of a iPhone for diagnostics.
Andy.MacFadyen wrote: Until I try synching it, adding a filter and getting that to work I can't see any advantage over using a stephoscope.
The idea of using a knock sensor might work better as it is designed to work on a narrower band of frequencies.
Awwwww, sorry to hear that didn't work out!
I like the knock sensor idea, too. The only problem is most knock sensors are expensive-ish, at least $50. Not the worst gamble I've ever made, but not cheap, either The last two knock sensors I replaced on the job were electrically open, so no luck there.
oh yeah, you actually have to pay for car parts! :whistle:
You guys are awesome. I never expected this post to branch off like this. But since it did... Me being a curious guy and such, I was poking around the Adafruit site and found a small accelerometer that I'm tempted to buy and hack into a cheap low tech Vibration detector.
I'm no electronic guru by any means but my little brother is! Christmas is coming so... why not.
No eBay APP ID and/or Cert ID defined in Kunena configurationHi I have made quite a successful noise/vibration sensor if clipped on the engine it will actually pick up the each power stroke. I know this because if you use the pico to monitor it and use the cursor RPM function it matches the rev counter perfectly. Here is the link, Look at this on eBay
For best results attach it to a crocodile clip permanently then clip it to a long screwdriver and move the tip of the screwdriver around to the areas where you think the problem is e.g alternator, power steering pump etc
Chriscoy wrote: You guys are awesome. I never expected this post to branch off like this. But since it did... Me being a curious guy and such, I was poking around the Adafruit site and found a small accelerometer that I'm tempted to buy and hack into a cheap low tech Vibration detector.
I'm no electronic guru by any means but my little brother is! Christmas is coming so... why not.
Oh yeah, sorry man :blush: Didn't mean to hijack your thread!
I have only used it to identify a noisy pulley once and it seemed to work fine the only problem is the customer didn't have the money to pay for the job.So I never did the before and after process to see the end results but you will definitely be surprised on how accurate the little sensor is. This video is where I got the idea from
The last two knock sensors I replaced on the job were electrically open, so no luck there. 
Still, amazing use of a iPhone for diagnostics. 
