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07-30-2018, 02:16 PM
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#1
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Name: sltlytwkd
Title: addicted
Status: Not Here
Join Date: Apr 2016
Location: Luxemburg WI
Member`s Gallery
Posts: 138
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tach pickup off damper bolts *help!*
I just installed a autometer diesel tach on my p24v. I made a bracket for the tach pickup to read of the 4 damper bolts. The problem I'm having is that the ARP damper bolts have a hole/dimple in the center of the bolt head which I believe is making the tach read 2x actual rpm... (thinking there's 8 bolts instead of 4) My question is, is there any way I can cheat it without getting different damper bolts?? Anyone else ever have this issue? Thanks in advance!
__________________
99' dodge 12v swap, 188/220, 5x16s, scheid 12mm pump, 165lb beehives, silver62/475, fuel lab, 47rh swap
03' jetta tdi, gtb2260vk, race 520s, 3" exhaust, 6" tip, Malone tune, 5 speed
94' dodge ppump 24v, 13mm, 6x18s, 200/220, 475/595, aero 1000, PCS, 4r100 swap, 2wd
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07-30-2018, 02:43 PM
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#2
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Name: bigstacks95
Title: Diesel Doc
Status: Not Here
Join Date: Jul 2008
Location: Falls Village, CT
Member`s Gallery
Posts: 2,030
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I machined 4 slots into the dampener and use that as the pickup. So it picks up around the edge of the balancer instead of the bolts
__________________
--Dave--
58 Dodge Power Wagon 3.0 Limited Pro Stock diesel pulling truck
2020 Ram 3500 HO/Aisin Laramie/night tow rig
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07-30-2018, 03:20 PM
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#3
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Name: sltlytwkd
Title: addicted
Status: Not Here
Join Date: Apr 2016
Location: Luxemburg WI
Member`s Gallery
Posts: 138
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Quote:
Originally Posted by bigstacks95
I machined 4 slots into the dampener and use that as the pickup. So it picks up around the edge of the balancer instead of the bolts
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It's a fluidamper, that won't harm it at all right? It already has 2 slots on it, I wish there was an option on the tach.
__________________
99' dodge 12v swap, 188/220, 5x16s, scheid 12mm pump, 165lb beehives, silver62/475, fuel lab, 47rh swap
03' jetta tdi, gtb2260vk, race 520s, 3" exhaust, 6" tip, Malone tune, 5 speed
94' dodge ppump 24v, 13mm, 6x18s, 200/220, 475/595, aero 1000, PCS, 4r100 swap, 2wd
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07-30-2018, 03:20 PM
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#4
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Name: McCalley08
Title: Rookie
Status: Not Here
Join Date: May 2017
Location: Iowa
Member`s Gallery
Posts: 11
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I would offset the pickoff so its in a larger diameter picking up the bolts on the outer edge of the head and not over the dimple.
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07-30-2018, 06:02 PM
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#5
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Name: sltlytwkd
Title: addicted
Status: Not Here
Join Date: Apr 2016
Location: Luxemburg WI
Member`s Gallery
Posts: 138
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Quote:
Originally Posted by McCalley08
I would offset the pickoff so its in a larger diameter picking up the bolts on the outer edge of the head and not over the dimple.
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Yea I thought about that too. Maybe I'll just try slotting the holes to move it around a bit, would be the easiest to try anyways.
__________________
99' dodge 12v swap, 188/220, 5x16s, scheid 12mm pump, 165lb beehives, silver62/475, fuel lab, 47rh swap
03' jetta tdi, gtb2260vk, race 520s, 3" exhaust, 6" tip, Malone tune, 5 speed
94' dodge ppump 24v, 13mm, 6x18s, 200/220, 475/595, aero 1000, PCS, 4r100 swap, 2wd
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07-30-2018, 06:21 PM
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#6
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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I was only able to get mine smooth and accurate by welding four small tabs on the outside diameter of the balancer. I tried the recess style first and was jumpy and seemed to read high.
Smooth as factory with the raised tabs, again on a much larger diameter than trying to signal off the mounting bolts.
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07-30-2018, 09:22 PM
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#7
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Name: sltlytwkd
Title: addicted
Status: Not Here
Join Date: Apr 2016
Location: Luxemburg WI
Member`s Gallery
Posts: 138
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Quote:
Originally Posted by jasonc
I was only able to get mine smooth and accurate by welding four small tabs on the outside diameter of the balancer. I tried the recess style first and was jumpy and seemed to read high.
Smooth as factory with the raised tabs, again on a much larger diameter than trying to signal off the mounting bolts.
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What did use for tabs? Like key stock? It's safe to weld on the damper without being out another $400? Lol
__________________
99' dodge 12v swap, 188/220, 5x16s, scheid 12mm pump, 165lb beehives, silver62/475, fuel lab, 47rh swap
03' jetta tdi, gtb2260vk, race 520s, 3" exhaust, 6" tip, Malone tune, 5 speed
94' dodge ppump 24v, 13mm, 6x18s, 200/220, 475/595, aero 1000, PCS, 4r100 swap, 2wd
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07-31-2018, 05:55 AM
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#8
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
Member`s Gallery
Posts: 4,412
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Quote:
Originally Posted by sltlytwkd
What did use for tabs? Like key stock? It's safe to weld on the damper without being out another $400? Lol
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Yes, and just two small tig weld beads.
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07-31-2018, 09:42 AM
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#9
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Name: bigstacks95
Title: Diesel Doc
Status: Not Here
Join Date: Jul 2008
Location: Falls Village, CT
Member`s Gallery
Posts: 2,030
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Quote:
Originally Posted by sltlytwkd
It's a fluidamper, that won't harm it at all right? It already has 2 slots on it, I wish there was an option on the tach.
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Yeah mines a Fluidamper as well. I machined four 1 inch wide grooves spaced evenly around the edge. Fluidamper says thats fine just dont go deeper than 0.200"
__________________
--Dave--
58 Dodge Power Wagon 3.0 Limited Pro Stock diesel pulling truck
2020 Ram 3500 HO/Aisin Laramie/night tow rig
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07-31-2018, 10:12 AM
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#10
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Name: PVXCummins
Title: Here to Learn
Status: Not Here
Join Date: Sep 2009
Location: North Carolina
Member`s Gallery
Posts: 175
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__________________
98 RCLB 3500 12V 2.5 Pulling Truck
04 F250 6.Blow Tow Rig
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07-31-2018, 12:24 PM
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#11
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Name: sltlytwkd
Title: addicted
Status: Not Here
Join Date: Apr 2016
Location: Luxemburg WI
Member`s Gallery
Posts: 138
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Quote:
Originally Posted by PVXCummins
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Good read! Thanks!
__________________
99' dodge 12v swap, 188/220, 5x16s, scheid 12mm pump, 165lb beehives, silver62/475, fuel lab, 47rh swap
03' jetta tdi, gtb2260vk, race 520s, 3" exhaust, 6" tip, Malone tune, 5 speed
94' dodge ppump 24v, 13mm, 6x18s, 200/220, 475/595, aero 1000, PCS, 4r100 swap, 2wd
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