Isspro EV2 oil press fluctuation

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az chip
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Isspro EV2 oil press fluctuation

Postby az chip » Mon Nov 06, 2017 6:41 pm

I installed a secondary oil pressure because, old Jeep. It flucuates at 70-75 psi like a fast windshield wiper. Any way to dampen that down?

LINK http://www.issprogauges.com/EV2-0-100-PSI-Oil-Pressure-Gauge-p/iss-r16211.htm
'81 Cherokee Chief 81 WT Chief/MSD 6/ Rusty 4" Spring lift/ Bulltear oil adapter/K&P Engineering Oil Filter/ NP 208/ Serehill Light Harness/ H4 Headlights/ Evil Twin Fab Luggage rack and sliders/ Ross mirror mounts.

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tgreese
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Re: Isspro EV2 oil press fluctuation

Postby tgreese » Tue Nov 07, 2017 5:35 am

Electrical? Where is it connected?
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D

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Lumpskie
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Re: Isspro EV2 oil press fluctuation

Postby Lumpskie » Tue Nov 07, 2017 6:45 am

Yeah, that's an electrical gauge. I run the same gauge on my Land Cruiser. (I run oil pressure, EGT and Boost Pressure. My oil pressure might move from from 50-55psi, sit there for a second and them move back when first I start my rig. Once I start moving, it settles down and holds a single pressure) How fast is it fluctuating? (is it bouncing back and forth or is it moving to one point, stopping then moving back?) The gauge doesn't have infinite fidelity like a mechanical gauge. So, if your rig happens to be right between two display points, at the cutoff, I can see how it might go back and forth a bit.

Here's what Issopro says:
"Isspro EV2 electric gauges are built with microprocessor-controlled stepper motor movements". Could it be that you happen to be right at one of those stepper motor movement points?
1989 Grand Wagoneer - Rebuilt 360, 2" Alcans, 10" travel Gabriel Guadian shocks.
1996 Land Cruiser - 1HD-T Diesel, Gturbo (23psi), Wholesale Automatics 442f, F/R ARBs, 35" Duratracs, ARB Rear Bumper, OME 2" lift, home built sliders and aluminum belly skid
2000 Honda Civic - Integra GSR engine, transmission, shift linkage and axles, 200hp, 33 combined mpg
2006 Mitsubishi Lancer Evolution 9 - 437hp/447ft-lb

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tgreese
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Re: Isspro EV2 oil press fluctuation

Postby tgreese » Tue Nov 07, 2017 7:06 am

I think Lumpskie is saying that the resolution of the gauge is 5psi at 70, and you are on the cusp between two "steps." This seems pretty coarse to me, and I would expect better than 5psi accuracy from a $200 gauge.

I'd call for support. An electric gauge should be capable of internal damping... even if the pressure is really fluctuating like that. Particularly if it contains some programmable element (the "microprocessor-controlled stepper motor"). You could attach a cheap mechanical gauge right at the source and verify that the flutter is real, or not. A SunPro or such should be less than $20.
Tim Reese
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination A/Ts, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D

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Stuka
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Re: Isspro EV2 oil press fluctuation

Postby Stuka » Tue Nov 07, 2017 7:15 am

I am more concerned with your oil pressure being at 75psi. Where is the sender located?
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Stock, but not for long!
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

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babywag
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Re: Isspro EV2 oil press fluctuation

Postby babywag » Tue Nov 07, 2017 9:46 am

x2

Depending on pump/spring/filter adapter combo, @ that pressure the filter may not be in play circulating dirty oil through the engine.
-Tony
'88 GW (aka Babywag) '90 GW (aka JunkBucket) both fuel injected.

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az chip
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Re: Isspro EV2 oil press fluctuation

Postby az chip » Tue Nov 07, 2017 12:08 pm

The sender is T'ed off the original pressure sender block. The original oil press gauge reads 55 psi cold idle, and 25 psi hot idle. RPM is around 800 cold idle and 650 warm.
'81 Cherokee Chief 81 WT Chief/MSD 6/ Rusty 4" Spring lift/ Bulltear oil adapter/K&P Engineering Oil Filter/ NP 208/ Serehill Light Harness/ H4 Headlights/ Evil Twin Fab Luggage rack and sliders/ Ross mirror mounts.

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Tatsadasayago
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Re: Isspro EV2 oil press fluctuation

Postby Tatsadasayago » Wed Nov 08, 2017 2:02 am

If the gauge is not malfunctioning I'd say the oil filter may be the culprit...
1977 Cherokee Chief - The Blair Jeep Project III
A collection of parts flying in close formation

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Lumpskie
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Re: Isspro EV2 oil press fluctuation

Postby Lumpskie » Wed Nov 08, 2017 6:30 am

I played around with my Issopro yesterday... double check that your connector on the back of the gauge is fully seated. Maybe try unplugging and replugging it in. A "almost fully connected" condition on my gauge gave me symptoms like you described.
1989 Grand Wagoneer - Rebuilt 360, 2" Alcans, 10" travel Gabriel Guadian shocks.
1996 Land Cruiser - 1HD-T Diesel, Gturbo (23psi), Wholesale Automatics 442f, F/R ARBs, 35" Duratracs, ARB Rear Bumper, OME 2" lift, home built sliders and aluminum belly skid
2000 Honda Civic - Integra GSR engine, transmission, shift linkage and axles, 200hp, 33 combined mpg
2006 Mitsubishi Lancer Evolution 9 - 437hp/447ft-lb

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az chip
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Re: Isspro EV2 oil press fluctuation

Postby az chip » Wed Nov 08, 2017 11:03 am

Thanks Lumpskie. I will check Saturday when I get off the 15 hour day shifts. I think my sensor wire may not be fully seated in that crappy design connector. I know, no tools needed, But really?
'81 Cherokee Chief 81 WT Chief/MSD 6/ Rusty 4" Spring lift/ Bulltear oil adapter/K&P Engineering Oil Filter/ NP 208/ Serehill Light Harness/ H4 Headlights/ Evil Twin Fab Luggage rack and sliders/ Ross mirror mounts.

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az chip
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Location: Mesa, AZ

Re: Isspro EV2 oil press fluctuation

Postby az chip » Wed Nov 22, 2017 7:12 pm

I checked connections. All good. May have had some air in there. It smoothed out on the run to TITD. It reads more normal now. Still higher than the stock gauge. There are no more fluctuations.
'81 Cherokee Chief 81 WT Chief/MSD 6/ Rusty 4" Spring lift/ Bulltear oil adapter/K&P Engineering Oil Filter/ NP 208/ Serehill Light Harness/ H4 Headlights/ Evil Twin Fab Luggage rack and sliders/ Ross mirror mounts.


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