olddragger

iTrader: (3)

what readings are you getting?
OD

ayrton012

Hey,hey hey!!!

I was talking about the eccentric shaft's oil bypass thermo pellet!!!

Otherwise the oil cooler's thermo bypasses opening and closing does not affect much on oil pressure.

9krpmrx8

iTrader: (46)

PhillipM, you were right. Now I believe.

ayrton012

90PSI. Strange.

How did you do it?

PhillipM

I knew the gauges weren't wrong, quite a big pressure drop across the original coolers then?
If there is, they must be quite a flow restriction...

9krpmrx8

iTrader: (46)

Yep, I have seen an increase of 15PSI from 7500k up. Plus, my oil heats up to 175-180 in about half the time. I am getting intermittent error codes with my temp gauge but I will get that sorted out this week.

ayrton012

Very, very big restriction.

Strange, that the pressure is so big, that the rear regulator can't keep the factory max. 74 PSI. Is it possible?

9krpmrx8

iTrader: (46)

I am using 5/8" hose with JIC fittings and teh thermostat has 1/2" ports. The factory lines seems sufficient for flow but they are much too complicated. The two factory coolers with one after market thermostat and custom feed and return lines would be a good option. I'm not sure why Mazda chose the route they took with the flow control thermostats.

HiFlite999

iTrader: (2)

I've found the accuracy on a couple of different oil pressure gauges to be horrible. Calibrating using air pressure before installation, I found one to be off by about a factor of two. The better one is ok up to about 50 psi, then gets optimistic fast, reading 80 lbs at a real 70 psi. (The sensor is mounted on an adapter under the oil filter.)

Even correcting for this, my OP behaves strangely. Upon cold startup, I get the reference 50 psi at 3,000 rpm which becomes around 60 when water temp is 180 deg F and oil temp at 170 deg F. (This is with ~5w/30 oil). The REmedy thermostat and water pump hasn't let me reach the reference 100 C yet, but this is Michigan

Looking forward to the REmedy oil pressure solution.

ASH8

So I gather 9K you have NO original OC working?...YES.

So you have returned your car to an FC RX-7 type system, same Oil Pump and By Pass Valves BTW.

Does anyone have an Auto Trans RX-8 with only ONE ( left) original Oil Cooler?, I wonder what the Oil Pressure is with these??
Or any Australian S1's with only one Oil Cooler??

Perhaps, less 'Oil Lines' does make a difference ??

9krpmrx8

iTrader: (46)

I don't know but my OP gauge is very consistent.


ASH8, yes I removed the original coolers and lines completely.

ayrton012

I think 9K changed "only" the lines, the coolers, and the bypass of the coolers, not the pump and the regulator.

Yes, that would be useful information if there is difference between the single (AT) and double coolers Renesis max oil pressure.

Otherwise the coolers's bypasses has not affect on the max oil pressure. Only the narrowest diameter pipe-hose-drilling would has affect on it. Maybe there is a too narrow drilling somewhere in the long factory system.

ayrton012

I don't think that this regulating matter happens in the factory coolers, rather in the long pipes system between the pump-coolers-engine.
I say this because the opening and closing of the integrated cooler's bypasses means only about 1,5-2 PSI change in the oil pressure (idle), according to my gauge. So if the oil avoids the factory coolers (closed OC bypasses) the pressure does not change.

???

olddragger

iTrader: (3)

one major change is he has converted from a plate type of oil cooler to a pipe type. plate type are notorious for having high restriction to flow.
OD

madcows

My oil coolers have been too effective recently. It seems that they only get very warm when standing still (touching them, I have no idea what the actual temps are). After driving around for several miles (not driving hard) with outside temps being around 50F, they are very cool to the touch, which makes me even more weary of driving it hard. I wonder if this mainly due to the missing inner wheel well behind both coolers?!

I would like to have a bypass-able oil cooler which runs through the radiator to help warm up the oil quicker.

9krpmrx8

iTrader: (46)

Yes with out the wheel wells they will get constant air flow through them and they may cool too much. The thermostat I have will close if the oil temperature drops too low.

madcows

How does the thermostat circuit work? I assume it just by-passes the cooler, correct?

9krpmrx8

iTrader: (46)

The oil thermostat is designed to regulate oil flow through cooling devices until optimal (minimum) temperatures are reached. Cold oil enters the thermostat and is bypassed through the center of the unit returning to engine. During warm-up the thermostat never closes off oil flow to the cooler, rather, it offers a less restrictive path for the oil to flow allowing the cooler to acclimate to system temperature. As oil warms to 180 degrees the operating "waxstat" closes the bypass permitting full flow to cooler.

mac11

iTrader: (1)

buy a factory radiator for an AT and use the small circuit for the ATF to do just that.

I had to drive the car very hard to get them temps above 140-150 in the winter here.

PhillipM

Wish I had that problem!

9krpmrx8

iTrader: (46)

I have been searching but does anyone know what the optimal oil temps are? I have read between 180-200F but what in the minimum temp the oil should be?

ASH8

Good...OK so now you do have an FC Oil System (Circuit, Pump, Valves) albeit with a better front Middle oil cooler.

In your case I really do not believe you need the REAR by pass mod done now.

I repeat what I said Months ago, the Extra Oil Cooler and LONG Oil lines ARE Robbing the RENESIS 1 engines OIL Pressure..

Thank-you 9K, you have proved my theory correct.

9krpmrx8

iTrader: (46)

Yes, my lines are much shorter and there is only one 90 degree bend in the setup. I will be taking a long raid trip tomorrow so I will have some good data tomorrow evening.

ASH8

Yes, definitely, like 9K said, no rear splash shields are letting TOO much cold/cool air through cooling your oil too well.

Now you are in Winter (soon) I would be returning to OEM...ASAP

Being in Summer here (almost) and with 113F degrees here last week, my rear mesh shield Mod helped to keep my Coolers and Oil cooler..

olddragger

iTrader: (3)

i think he needs the rear bypass done to increase the amount of oil going through the filter. Without it he is sending more oil than normal back to the engine? Not filtered.
Correct me if I am wrong?
OD