| Author |
Message |
Jim Avery (Boxer12)
Member
Username: Boxer12
Post Number: 377
Registered: 6-2003
| | Posted on Saturday, October 11, 2003 - 3:02 pm: | |
Thanks for the input. I will check function of pressure guage and go from there. Jim |
Adam Goldman '86 TR (Icnsltmfg)
Member
Username: Icnsltmfg
Post Number: 619
Registered: 8-2001
| | Posted on Saturday, October 11, 2003 - 8:15 am: | |
My TR never goes above 90psi even on the track. |
Michael N. (Man90tr)
Member
Username: Man90tr
Post Number: 801
Registered: 4-2001
| | Posted on Saturday, October 11, 2003 - 12:02 am: | |
Jim,
I would do what Lou B says first. I just drove my TR (1990) tonight - same set up as yours -- for 100+ miles. In 3rd gear I have a reading of 85 PSI at 3000 rpms and at 100 mph at 6750 in 3rd still -- it reads 100 PSI. Stabilizes at 100 PSI at 5500 rpms and does not go higher than that. Checked 2nd gear - 80 mph at 6800 rpms - oil psi 100 stable. I use Valvoline 20W50 Racing oil. Given this data I would say 120 is high - In fact I have never seen 120 and I have had the car redlined in 4th at 130 and I do recall being only a coulple needle widths above 85 -- just like I was tonight.
Michael |
Jim Avery (Boxer12)
Member
Username: Boxer12
Post Number: 365
Registered: 6-2003
| | Posted on Friday, October 10, 2003 - 11:45 am: | |
I will investigate the oil pressure further, to see if I can adjust the high end only. It runs fine up to 6K and I don't want it to go lower throughout the range. Thanks for the input. Jim |
Lou B (Toby91)
Member
Username: Toby91
Post Number: 346
Registered: 4-2001
| | Posted on Friday, October 10, 2003 - 6:31 am: | |
My TR read high oil pressure until I changed the sensor. They apparently get varnished or contaminated and read high. I would check that first. |
dave handa (Davehanda)
Intermediate Member
Username: Davehanda
Post Number: 2000
Registered: 5-2001
| | Posted on Friday, October 10, 2003 - 1:52 am: | |
The oil pressure is (or should be) adjustable. It is on my 328. I noticed I was running over 120psi on my gauge at 6k+ rpms, and that is not right. The manual says 92psi max at 6k. So my mechanic put a mechanical gauge on to confirm the pressures (my dash gauge reads maybe 5psi high we found), and adjusted the pressure via swapping springs or something. Now it seems about right, I might read no higher than 95 to 100psi or so on my gauge, hard to be super accurate with the dash gauge. |
Jim Avery (Boxer12)
Member
Username: Boxer12
Post Number: 363
Registered: 6-2003
| | Posted on Thursday, October 09, 2003 - 10:56 pm: | |
Frank, the OM just lists the recommended range of 65-92.5 PSI, not at a specific RPM, but Vince has some numbers.
I switched to 10W40 Syntec and it is performing virtually identical to the 15W50 (range= 40-120). Car runs at usual temps (195-220)
I wonder if it is the new filter (which is stock brand and number), which perhaps is not good.
Thanks for the input. I will continue to investigate. Jim |
vince porto (Vince)
New member
Username: Vince
Post Number: 16
Registered: 3-2002
| | Posted on Thursday, October 09, 2003 - 10:13 pm: | |
Jim,
High viscosity oil pressure indicates high resistance to flow (and lost HP).
High resistance to flow induces low flow rates.
Low flow rates can cause spun bearings.
Therefore: excess viscosity can cause spun bearings
(Though I would not call 15w-50 'excess' IF hot)
If your car tracks at such high oil temperatures that these viscous oils are needed to maintain pressure - I'd recommend looking at additional oil cooling instead of viscosity.
The TR manual says 'normal' is:
10w-40 viscosity
6000 rpm
80 psi pressure
212 deg. F
In my experience, much more than 'about' 12 to 14psi per 1000 rpm is a waste of HP and potentially damaging (assuming 'street' motor clearances).
Personally, I've opted for the 'other' way (street driving - cool climate) and use 0w-40 Mobil 1. Do wish Mobil 1 made a 10w-40. If in a warmer climate, I would switch brands in order to get a true 10w-40 synthetic.
Rgds,
Vince
|
Mitch Alsup (Mitch_alsup)
Intermediate Member
Username: Mitch_alsup
Post Number: 1184
Registered: 4-2002
| | Posted on Thursday, October 09, 2003 - 2:02 pm: | |
My F355 (yes I know this ia thread about BBs) has 100-105 PSI at normal street driving anywhere above 2500 RPMs on 20W50 and 10W40; and 45-50 PSI at idle. At the track, after a hot lapping session and the oil temp of 265-280 I see 90-95 PSI 5000-8500, and 35 PSI at idle. |
Frank Parker (Parkerfe)
Advanced Member
Username: Parkerfe
Post Number: 3058
Registered: 9-2001
| | Posted on Thursday, October 09, 2003 - 11:25 am: | |
I believe the recommended pressure range is at a certain RPM isn't it ? So, you would expect a higher pressure as you increase RPM above that set figure. |
Jim Avery (Boxer12)
Member
Username: Boxer12
Post Number: 359
Registered: 6-2003
| | Posted on Thursday, October 09, 2003 - 9:48 am: | |
Can somebody with TR track experience comment on oil pressures? I put 15W50 Mobil 1 in my car ('91 TR) and it now runs outside the recommended range of 65-92.5, even if I run a couple qts low. I am seeing almost 120 at over 6K revs, and below 50 at idle. Input would be appreciated. I don't want to blow any seals. Thanks, Jim |