EmeraldArcher06

I was wondering if anyone has had any experience with upgrading the oil pressure regulator to increase the pressure like the series II engines. I'm wondering if it's worth it, what kind of improvements anyone who has done this has noticed or what to expect, and which one to get if I do decide to do this mod.

The two that I've seen are the RE-medy from Mazmart which is $55:
http://mazmart.com/ItemDetail.aspx?id=586

and one from Racing Beat for $104:
http://www.racingbeat.com/RX8/Oil-System/11811.html


Not sure why there is such a big price difference. Also I haven't yet taken a look at the stock one, so which one would be less likely to be noticed if there was a warranty issue (if this would even affect it)? I'm new the forums and have only had my car for about 9 months and the only work I've done is replace the coils, plugs, and wires, but I have read through a lot of the forums and did read the new owner thread. I couldn't find any threads about this other than the brief mention in the new owner thread so I hope that I didn't just miss it and that this isn't a repeat.

Thanks in advance!

9krpmrx8

iTrader: (46)

Fairly common mod.

https://www.rx8club.com/showthread.p...t=oil+pressure

nycgps

iTrader: (1)

Use better oil ... 20w50 ... no issues ...

HiFlite999

iTrader: (2)

The thread 9krpm has a complete discussion. Sorry nycgps, nope, exactly the wrong thing to do without the oil pressure mod: you will *decrease* the flow under many circumstances using a heavier oil. A summary of why starts around here: https://www.rx8club.com/showthread.p...re#post3736289

I think the bypass is a good idea and have Mazmart's version on my car. If you do the mod, be sure to use Series II oil filters which have their bypass set to match the higher pressures.

EmeraldArcher06

Thanks for the responses! Those threads were incredibly informative. Hopefully it's an easy mod to do (I imagine it would be).

nycgps

iTrader: (1)

decrease flow? I know.

but what I do know is, people have been using it for DECADES without any issues, it's actually one of the reasons why most of the bearings are re-usable in FC and FDs. FE? NOT SO MUCH.

we can talk about theory all day, but the results is all that matters. 5w20 = garbage. it doesn't matter WHAT OIL MOD you use. it's still garbage.

assume running stock S1, I stick with at very least 10w40. 20w50 for summer.

i dont understand why FE guys are soooo damn afraid of using heavier weight oil. I made mistake of killing my **** with 5w20 junk(plus Mazda's own f-ked ups), never again.

higher pressure is good. most ppl mod their FC with FD regulator and 100~ psi and they have been doing it for decades. I have it for my FC as well.

so this is not new in the rx7 (new for rx8 owners that is)

and they STILL use 20w50 ... without issues of course


let's not start another oil pressure thread ... jeeze.

Arca_ex

iTrader: (10)

Regarding the last part of your post, is this necessary only if you're using OEM Mazda filters? I've been considering this mod and I use Wix oil filters on my car, I just looked up the Series I and Series II filters on their site and the By-Pass valve pressure settings are both identical.

9krpmrx8

iTrader: (46)

Yeah the aftermarket filters are all messed up. Some list the filters as the same and some have different models and the bypass ratings are all over the place as well. I even showed the manager at Advance how they differed between the different brands and he said he had no way of notifying them. I use the Purolator 09+ filters if I run out (or give them to friends) but I usually get OEM 09+ filters from mazmart by the case.

Arca_ex

iTrader: (10)

My only problem is that I have the racing beat oil sandwich plate for my gauges, so taller filters won't fit.

The Wix filters are rated at 8-11PSI but I see that the Purolator filters are rated at 14-18.

Would there be any severe negative consequences if I did the oil pressure regulator and didn't switch to a Series II filter? Or would this only matter in the case of a low oil pressure event or a filter failure/clogging type situation.

EDIT: After more searching on Purolator's website, the shorter Series I filter they make is also rated at 14-18PSI for the by-pass valve. It's 2.93" tall compared to the Wix OEM size of 2.57" tall. Might be able to fit that one, but I guess my question still stands since I can get Wix filters by the case at extremely low cost through my work...

ASH8

You know J you will get no disagreement from me, after all I first kept pounding on about the OP in S1 and it needed an upgrade and the need for the FD By Pass Valve mod, and I am tired of explaining the use of S2 Oil Filter (jeez)...for the last time Arca-ex, there is NO non genuine Oil Filter that has the same By Pass Rating as the OE S2 Toikico...

And J, agree with what you say above and what many overlook is the fact that Rotaries, particularly those with a little age has a lot of fuel wash (Gas) which gets into Oil and will/can dilute it...not so bad if you change every 3000 miles, but OLD fuel washed oil (5W20/30) has to be crap after 10K or so....you know what I mean..

TeamRX8

iTrader: (25)

pro Renesis engine builders have been using 20W50 oil with and without high pressure regulators for years with standard oil filters

the oil filter has an inlet/outlet differential pressure rating, it has nothing to do with the system pressure, if they are using a tighter or more restrictive filter element then it would need a higher bypass rating to account for the increased differential pressure it would cause

of course we've been through all this before and the same people still don't get the message

ASH8

wonder why Mazda physically changed the Series 2 Oil Filter and it's by pass specs, a newly designed Oil Pump plus system oil pressure increased at 3000 RPM over S1 and the rear By Pass Valve was also deleted on Renny II engines?

bse50

Probably because the oil filters are the same for a bunch of other cars they sell so it means saving cash?

ASH8

No other cars in Mazda use this filter..

bse50

Really? I must be looking at the wrong UFI parts catalogue then!
Anyway they tried to address oiling issues to make the best of what they had to play with. This means idiotic american regulations on oil weights and some lubrication issues that are not directly related to the oiling system per se.

I'm with teamrx8 on this one, i have a modified oil pressure regulator with rear shims and the trick works just fine. I also only use 10w40 oils and OE s1 oil filters...
The last filter I cut was full of metal particles, i guess it must be working!

ASH8

Make that Tokyo Roki

http://www.roki.co.jp/english/majorcus.html

http://www.filtermart.com/fpdbdb/fmccross.asp

http://www.michelecaroli.com/donaldson_filters.asp

OEM #

N3R114302 Oil Filter S2 (not listed)
B6Y114302 Oil Filter S1 (listed)

TeamRX8

iTrader: (25)

They change things for a wide variety of reasons. For all we know it is a bean counter decision. Maybe somebody took a bribe to specify xxx filter that can't be had anywhere else? Nobody questions that it has changed, but you are guessing as to why it changed.

Some of the stuff they do/did makes little sense. Like designing a side port exhaust system and instead of changing iron dimensions to accommodate properly flowing ports they instead did the sh1tt1est flow dynamics job to have every been used on an engine.

HiFlite999

iTrader: (2)

Indeed. For the same filter element, low flow = low pressure drop across the element, high flow = high pressure drop across the element.

For the same filter element, low viscosity = low pressure drop, high viscosity = high pressure drop. Regardless of the rate "weight" of the oil, in practice, cold oil has the highest viscosity the engine will see. Race engines see few cold starts and run with new (never partially clogged filters), so filter bypasses are of less interest. Street cars see thousands of cold starts. Regardless of the oil weight I've used, I see 90 psi with the bypass mod on any start, a few seconds with 80 deg OAT and for up to a minute at 40 deg F. That's probably gonna send a Series 1 filter into bypass.

Series II filter is also bigger implying that the element area is larger implying more capacity to remove junk and lower pressure drop across the element under the same conditions.

HiFlite999

iTrader: (2)

The Series II filter will fit using a Prosport sandwich plate, with a slight mod. The filter will interfere with the bottom of a plastic guide used to lead a couple of tubes from one side of the car to the other across the firewall. There are 4 slots in that guide. Move the lines to the top slots (and on the passenger side guide too) and cut off the bottom of the guide. Viola, it will fit, though still a PIA to get to.

TeamRX8

iTrader: (25)

for all you know your filter is in bypass mode 100% of the time, that doesn't mean the filter still won't collect particles

and you have proven flow measurements between the S1 and S2 oil systems?

again, the system pressure is not a correlation with the oil filter bypass pressure

if you are an engineer your diploma should be burned, better yet the university that gave it to you should be burned

ASH8

HiFlite999

iTrader: (2)

TeamRX8 is at it again. Failing to make a point in a rational way, he fires up the insult machine. One moment, he is insulting Conventional Wisdom, and the next he is invoking it to "support" his own pov. Given that he knows something, he assumes (or has to project) that he knows everything. Your behavior here stinks.

(For the uninitiated, his next response will be some other insult; unfortunately the ignore option no longer works.)

nycgps

iTrader: (1)

oh boy ...

lemme just repeat this once again ...

i dont understand why FE guys are soooo damn afraid of using heavier weight oil

*FLAME SUIT ON!!! TAKE COVER!!!!!*

nycgps

iTrader: (1)

I think they did say the reason why they changed the oil filter. one of the reasons was the pressure and the bypass valve thing, should be in S2 FSM somewhere.

but honestly, people with FD and high pressure survive with the same Oil filter that ALL rotary use ... even Rx-8 ... yeah it's the same filter.

supergoat

I'm sure he knows his stuff, but he definitely has absolutely zero social skills.