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Author Topic: DIY Crank Position Sensor Modification  (Read 5511 times)

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Offline chrisfranklin

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DIY Crank Position Sensor Modification
« on: May 09, 2011, 11:38:43 PM »
Turbo city used to sell "modified" CPS for Jeeps to apparently yield a slight timing advance. 

Was looking at this write-up http://www.docstoc.com/docs/2538922/How-to-Crankshaft-Position-Sensor-Mod-(aka-Timing-Advance-Mod).  Looks like the guy just slotted the CPS to enable it to mount slightly to the right of its original position.  Anybody tried this?
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Offline Jeffy

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Re: DIY Crank Position Sensor Modification
« Reply #1 on: May 09, 2011, 11:44:51 PM »
Quote from: chrisfranklin on May 09, 2011, 11:38:43 PM
Turbo city used to sell "modified" CPS for Jeeps to apparently yield a slight timing advance. 

Was looking at this write-up http://www.docstoc.com/docs/2538922/How-to-Crankshaft-Position-Sensor-Mod-(aka-Timing-Advance-Mod).  Looks like the guy just slotted the CPS to enable it to mount slightly to the right of its original position.  Anybody tried this?
That's what the Turbo City CPS was.  You can advance or retard the timing a few degrees.
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Offline neale_rs

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Re: DIY Crank Position Sensor Modification
« Reply #2 on: May 10, 2011, 09:52:03 AM »
Does it really work or would the computer "adapt" to it and negate the effect? 

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Offline sharpxmen

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Re: DIY Crank Position Sensor Modification
« Reply #3 on: May 10, 2011, 10:05:07 AM »
Quote from: neale_rs on May 10, 2011, 09:52:03 AM
Does it really work or would the computer "adapt" to it and negate the effect? 



it would only adapt if there's a knock sensor, moving it will trick the computer as to the position of TDC, so without any other input will just advance or retard the timing by the amount of offset you set when in the new location (the PCM "thinks" it's the correct position to generate the spark).
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Offline neale_rs

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Re: DIY Crank Position Sensor Modification
« Reply #4 on: May 10, 2011, 11:18:03 AM »
Thanks
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Torch_Ind

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Re: DIY Crank Position Sensor Modification
« Reply #5 on: May 10, 2011, 07:32:31 PM »
cool
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Offline chrisfranklin

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Re: DIY Crank Position Sensor Modification
« Reply #6 on: May 10, 2011, 10:21:37 PM »
If anybody does this mod, would be cool to hear how it goes, effects on drivability.  Will probably give it a go myself before too long.
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Offline chrisfranklin

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Re: DIY Crank Position Sensor Modification
« Reply #7 on: May 21, 2011, 02:19:01 AM »
I'm buying a new CPS and will "notch" it and see how it goes
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quicksand

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Re: DIY Crank Position Sensor Modification
« Reply #8 on: June 22, 2011, 12:09:28 PM »
Does a 97 2.5L have a CPS ?
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Offline aw12345

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Re: DIY Crank Position Sensor Modification
« Reply #9 on: June 22, 2011, 04:00:30 PM »
Yes
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quicksand

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Re: DIY Crank Position Sensor Modification
« Reply #10 on: June 22, 2011, 04:26:40 PM »
So then that can be modified right? What type of modifications can it be modified for? I have heard of map adjusters, IAT relocations, but silly me I thought CPS where only on 4.0Ls, I did not realize a 2.5L manaul had one. I know quadratec carrys them for 4.0Ls. What are benefits of this being modified? And I thought I knew it all, HUH.
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Offline Jeffy

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Re: DIY Crank Position Sensor Modification
« Reply #11 on: June 22, 2011, 05:25:17 PM »
Read the post?
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quicksand

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Re: DIY Crank Position Sensor Modification
« Reply #12 on: June 22, 2011, 08:33:33 PM »
I read it, got it.
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95yjman

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Re: DIY Crank Position Sensor Modification
« Reply #13 on: June 23, 2011, 12:27:17 AM »
You'll have that heh
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quicksand

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Re: DIY Crank Position Sensor Modification
« Reply #14 on: June 23, 2011, 11:04:47 AM »
I will look more into it. Hey whats you guys opinion or experience on IAT relocation, does it work or is it hype ?
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