batook
01-07-2013, 05:11 PM
I finished installing the oil pressure and oil temp gauges in my 91 AWD 5-speed Previa last weekend. I installed a Mishimoto oil filter sandwich adapter at the last oil change which provides 3 1/8" NPT threaded ports. Conveniently, the Auto Meter cluster I used (AutoGage #2391) came with pressure and temp senders having 1/8" NPT male threads, which simplified installation since I didn't need to use any adapters.
Mishimoto Oil Filter Sandwich Plate:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/MishimotoMMOP-TPS.jpg
Installed the oil pressure and temp senders included in the AutoGage 2391 kit onto the Mishimoto oil filter sandwich plate:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders01.jpg
Connected the wiring and routed it out of the way with zip ties:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders02.jpg
I located this grommet (above the radiator hoses) as a perfect spot to run the wiring into the interior. It leads to the front passenger footwell.
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders03.jpg
Wiring is zip-tied to the starter cable to keep it clear of the spinning SADS and front driveshaft:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders04.jpg
Wiring is run along this line above the SADS and through the grommet:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders05.jpg
Here is the sender wiring exiting the grommet on the inside of the van under the front passenger floor mat:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders06.jpg
Installed the AutoGage Tri-Gauge cluster with double-stick tape.
The wiring is run through the stereo compartment and out the plastic cover of the steering column
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders07.jpg
Fully-operational gauges:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders08.jpg
Nighttime illumination, I used the wire lead for the factory stereo illumination that's switched with the headlights:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders09.jpg
The goal of installing these gauges was to prove to myself that the super-thin 0W-20 Mobil-1 synthetic oil that I've been using in all of my vans for over a year now is safe for the Previa's motor. There is a chart that Toyota of Canada put out a while back that back-spec'ed 5W-20 of Toyota's Genuine Motor Oil for the 95-97 (S/C) Previa motor. Knowing that the S/C and N/A Previa motors are essentially the same (except for a larger bore and stoke and lower compression ratio in the S/C motor) I compared the HTHS (high-temp high-shear) viscosity of that oil to the Mobile-1 0W-20 I wanted to use. Based on the HTHSV on the data sheet of the Mobil-1, it was theoretically OK to use, but I wanted actual confirmation (and gauges are cool!) I can now confidently say that the oil is fine to use year-round in all temperatures, and actually with room to spare (could even go thinner!). As I learned from researching motor oil at the Bob Is The Oil Guy forums, you need at least 10 psi of oil pressure for every 1000 rpms. Since oil gets thinnest (and thus pressure is lowest) when the oil is fully warmed up, you need to make sure you are still getting the required pressure when the oil is hot. This takes about 25-30 minutes of highway driving to achieve (MUCH longer than the coolant temperature reaching "operating temperature", which only takes about 5 minutes). In fact, when the factory coolant temp needle first reaches the "normal" range, the oil is barely 100F.
When the oil is 220-230F (after driving for a half-hour on the freeway), I observed the following oil pressures:
40 psi @ 2500 rpm
50 psi @ 3000 rpm
60 psi @ 4000 rpm
65 psi @ 4500 rpm
70 psi @ 5000 rpm
This tells me that the oil I'm using is protecting my engine under all conditions and all temperatures (since the oil pressure is even higher than this when the oil is colder and thus thicker). According to the data sheet, the 0W-20 Toyota Genuine Motor Oil is even thinner than the Mobil-1 0W-20, so I might try some that in the future to experiment with and see if the psi is any different using Toyota's oil.
Mishimoto Oil Filter Sandwich Plate:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/MishimotoMMOP-TPS.jpg
Installed the oil pressure and temp senders included in the AutoGage 2391 kit onto the Mishimoto oil filter sandwich plate:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders01.jpg
Connected the wiring and routed it out of the way with zip ties:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders02.jpg
I located this grommet (above the radiator hoses) as a perfect spot to run the wiring into the interior. It leads to the front passenger footwell.
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders03.jpg
Wiring is zip-tied to the starter cable to keep it clear of the spinning SADS and front driveshaft:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders04.jpg
Wiring is run along this line above the SADS and through the grommet:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders05.jpg
Here is the sender wiring exiting the grommet on the inside of the van under the front passenger floor mat:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders06.jpg
Installed the AutoGage Tri-Gauge cluster with double-stick tape.
The wiring is run through the stereo compartment and out the plastic cover of the steering column
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders07.jpg
Fully-operational gauges:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders08.jpg
Nighttime illumination, I used the wire lead for the factory stereo illumination that's switched with the headlights:
http://i744.photobucket.com/albums/xx86/bat00k/previa/gauges/senders09.jpg
The goal of installing these gauges was to prove to myself that the super-thin 0W-20 Mobil-1 synthetic oil that I've been using in all of my vans for over a year now is safe for the Previa's motor. There is a chart that Toyota of Canada put out a while back that back-spec'ed 5W-20 of Toyota's Genuine Motor Oil for the 95-97 (S/C) Previa motor. Knowing that the S/C and N/A Previa motors are essentially the same (except for a larger bore and stoke and lower compression ratio in the S/C motor) I compared the HTHS (high-temp high-shear) viscosity of that oil to the Mobile-1 0W-20 I wanted to use. Based on the HTHSV on the data sheet of the Mobil-1, it was theoretically OK to use, but I wanted actual confirmation (and gauges are cool!) I can now confidently say that the oil is fine to use year-round in all temperatures, and actually with room to spare (could even go thinner!). As I learned from researching motor oil at the Bob Is The Oil Guy forums, you need at least 10 psi of oil pressure for every 1000 rpms. Since oil gets thinnest (and thus pressure is lowest) when the oil is fully warmed up, you need to make sure you are still getting the required pressure when the oil is hot. This takes about 25-30 minutes of highway driving to achieve (MUCH longer than the coolant temperature reaching "operating temperature", which only takes about 5 minutes). In fact, when the factory coolant temp needle first reaches the "normal" range, the oil is barely 100F.
When the oil is 220-230F (after driving for a half-hour on the freeway), I observed the following oil pressures:
40 psi @ 2500 rpm
50 psi @ 3000 rpm
60 psi @ 4000 rpm
65 psi @ 4500 rpm
70 psi @ 5000 rpm
This tells me that the oil I'm using is protecting my engine under all conditions and all temperatures (since the oil pressure is even higher than this when the oil is colder and thus thicker). According to the data sheet, the 0W-20 Toyota Genuine Motor Oil is even thinner than the Mobil-1 0W-20, so I might try some that in the future to experiment with and see if the psi is any different using Toyota's oil.