Important

[FlexdXJ]

Nothing much. Love the new life in alabama. I dont post up much anymore.

Just wanted to drop in and say hey. Jeep has been running great. Hope to venture up north again one year for either the Crawl or winterfest.

We'd love to see you, Tess, and the boys at Harlan! Thinking of getting a Land between the lakes run together around september, you're more than welcome to come.

 

[Rev Den]

IT'S ALIVE!!!!!!!!!!!!!!!!!!!

Runs great and smooth. I just cut the tab off for the timing indicator, took off the pulley and all is good. I think I might be replacing the thermostat, wire in the electric fan with a toggle switch and all should be good for now.

Yea.



Rev

 

[Rev Den]

We'd love to see Tess at Land between the lakes run around september, she is more than welcome to come.

Fixed.



Rev

 

[Rev Den]

Question:

Does a CPS open or close at the timing mark? And is it just one pulse, or several at each trigger?

Rev

 

[kastein]

It's not really an open vs close type thing - it's either a high or a low logic signal, on OBD rigs at least. The answer is even muddier on RENIX. The sensor is a Hall effect element with a magnet attached to it so that it can detect differences in the magnetic permeability of the space in front of its nose, which is modulated by the gaps in the steel reluctor ring.

Each pulse should be as long as a notch in the ring. I'm just not sure if they are low voltage (0-0.8v or so) pulses on a high voltage "background" signal (3-5v or so) or vice versa. Let me see if I can find the oscilloscope reading someone posted a while back...

EDIT: each notch in the wheel will make a ~5 volt pulse.

Here is a scope picture of a crank posistion sensor signal on a 01 XJ running at idle speed, one revolution of the motor...signal amplitude is approx 4.8v... you can see the pulse for each notch in the flywheel.

 

[ChiXJeff]

NERDS!

 

[96 XJ Sport]

Still lurking around. :wave:

Hey! Glad to hear things are peachy in Alabama...oh wait, that's Georgia. Anyway, tell yours that my crew says hello. I still have your number and will use it.

 

[kastein]

NERDS!

you can't spell geek without EE :wierd:

 

[XJosh95]

NERDS!

Those nerds are a threat to our way of life!

 

[87manche]

RENIX is pretty much identical, just different pulse spacing owing to different number of teeth on the flywheel.

 

[kastein]

RENIX signal voltage also varies greatly since it's a VRM pickup instead of a TTL level output Hall effect, but the result is mostly the same.

RENIX signal voltage goes as high as 30V or so at high RPMs iirc. XXXXing magnets, how do they work?

 

[BRIANHO13]

NERDS!

2nded

 

[Fore Wheeler]

Ever watch "Revenge of the nerds", they shagged the hot chicks in the end. Just sayin.

 

[altrocker1]

Ever watch "Revenge of the nerds", they shagged the hot chicks in the end. Just sayin.

indeed...sometimes nerds get lucky. i am living proof of that.


alt "married up" rocker1

 

[poorboy87]

RENIX signal voltage also varies greatly since it's a VRM pickup instead of a TTL level output Hall effect, but the result is mostly the same.

RENIX signal voltage goes as high as 30V or so at high RPMs iirc. XXXXing magnets, how do they work?

I know you probably know this but.

Helpful lil tidbit I learned in school was everytime a coil collapses a voltage spike is produced.

Had a pretty good weekend. Hauled some cans to scrap saturday morning and went to Indy for the Brad Paisley concert. Got home at like 2AM this morning. Slept til 8 and spent the better part of the day loafing around and fishing. Didnt catch much but it was good to have a relaxing weekend with no working on something.

 

[kmanxj5050]

Its hot outside!

 

[kastein]

I know you probably know this but.

Helpful lil tidbit I learned in school was everytime a coil collapses a voltage spike is produced.

Had a pretty good weekend. Hauled some cans to scrap saturday morning and went to Indy for the Brad Paisley concert. Got home at like 2AM this morning. Slept til 8 and spent the better part of the day loafing around and fishing. Didnt catch much but it was good to have a relaxing weekend with no working on something.

Yep. V(t) = Ldi/dt and all that.

(yes... I just posted calculus on a jeep forum.)

 

[poorboy87]

Yep. V(t) = Ldi/dt and all that.

(yes... I just posted calculus on a jeep forum.)

Ok, I dont understand that but I get what happens to a hall effect switch.

Thats all I need know lol

I know V = Voltage? and t would be time? but Ldi and dt?

 

[kastein]

t is time, L is inductance, di/dt is the first derivative of the current waveform over time. Basically, voltage at any given second is equal to the inductance in henries multiplied by the instantaneous slope of the current in amps over the time in seconds.

 

[poorboy87]

Yup still greek. lol