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RX-7 3rd Gen Specific (1993-2002) RX-7 1993-2002 Discussion including performance modifications and Technical Support Sections.

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Old 04-06-2008, 09:54 PM   #1
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Default Keep or remove OMP....can't make up my mind...

When I am putting my new motor back together I need to decide if I want to keep the OMP or just block it off and premix. The OMP has 93k miles on it and I had previously bought a set of braided SS lines for it that were never installed. I guess my greatest fear is if the pump failed...I trust myself pouring in some oil each fill-up more than I trust the OMP...plus I am all about getting rid of clutter.

Someone talk me into one way or another.

PS...I'm trying to make the same decision about my AST as well






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Old 04-06-2008, 10:00 PM   #2
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I will be deleting mine with the new motor...as far as teh AST I deleted that a long time ago and I am using an AST for coolant overflow.
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Old 04-06-2008, 10:32 PM   #3
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how much premix for each fillup 4oz?
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Old 04-06-2008, 10:43 PM   #4
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Here is the thread from the RX-8 subforum dealing with premix: Premix
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Old 04-06-2008, 11:59 PM   #5
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is that u baja lol
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Old 04-07-2008, 12:04 AM   #6
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is that u baja lol
No, Bajaman just joined up
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Old 04-07-2008, 10:40 AM   #7
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I've been pre-mixing for the last year b/c my OMP stopped working. Pre-mixing is annoying. I'd rather have the OMP do it for me.

I don't mind adding some if I go to the track but I don't like using it on every fill-up.

The FD's OMP does a really good job and oil is injected at a variable rate - injects more oil as RPM and boost increases - which is more efficient. If you are pre-mixing on a 1 oz per 1 gallon basis, its too much for low RPM, off boost usage. However, that 1:1 ratio works OK for most WOT situations.

I know my plugs are dirtier since my OMP failed and I started pre-mixing.

Overall, very annoying but I don't have time or patience to replace the OMP.
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Old 04-07-2008, 10:42 AM   #8
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Quote:
Originally Posted by albertomg View Post
I've been pre-mixing for the last year b/c my OMP stopped working. Pre-mixing is annoying. I'd rather have the OMP do it for me.

I don't mind adding some if I go to the track but I don't like using it on every fill-up.

The FD's OMP does a really good job and oil is injected at a variable rate - injects more oil as RPM and boost increases - which is more efficient. If you are pre-mixing on a 1 oz per 1 gallon basis, its too much for low RPM, off boost usage. However, that 1:1 ratio works OK for most WOT situations.

I know my plugs are dirtier since my OMP failed and I started pre-mixing.

Overall, very annoying but I don't have time or patience to replace the OMP.
Although I have an FC, this pretty much holds true. I'd rather have my OMP back.
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Old 04-07-2008, 01:42 PM   #9
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Quote:
Originally Posted by albertomg View Post
I've been pre-mixing for the last year b/c my OMP stopped working. Pre-mixing is annoying. I'd rather have the OMP do it for me.

I don't mind adding some if I go to the track but I don't like using it on every fill-up.

The FD's OMP does a really good job and oil is injected at a variable rate - injects more oil as RPM and boost increases - which is more efficient. If you are pre-mixing on a 1 oz per 1 gallon basis, its too much for low RPM, off boost usage. However, that 1:1 ratio works OK for most WOT situations.

I know my plugs are dirtier since my OMP failed and I started pre-mixing.

Overall, very annoying but I don't have time or patience to replace the OMP.
What oil are you using as your pre-mix?
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Old 04-07-2008, 04:39 PM   #10
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Currently using Idemetsu purchased from Mazdatrix or rx7.com

Which reminds me, I'm almost out. Gotta order some more...
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Old 04-07-2008, 08:55 PM   #11
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Originally Posted by albertomg View Post
Currently using Idemetsu purchased from Mazdatrix or rx7.com

Which reminds me, I'm almost out. Gotta order some more...
Have you tried the Protek-R?
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Old 04-08-2008, 12:28 PM   #12
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Well, I have decided to elimate both the OMP and the AST.

So if anyone wants some brand new braided OMP lines or a excellent condition used Pettit aluminum AST...go here...

http://www.rotarycarclub.com/showthr...5689#post15689

.....now to continue a good discussion in this thread...lets talk about what type/brand of oil everyone runs as premix and at what ratio.
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Old 04-08-2008, 01:26 PM   #13
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Quote:
Originally Posted by 0110-M-P View Post
....I need to decide if I want to keep the OMP or just block it off and premix. The OMP has 93k miles on it and I had previously bought a set of braided SS lines for it that were never installed. I guess my greatest fear is if the pump failed...I trust myself pouring in some oil each fill-up more than I trust the OMP...plus I am all about getting rid of clutter.
You didn't say, but I'm assuming you've got a stand-alone otherwise you must keep it.
I had some trouble with mine but believe now it was likely caused by a freak voltage spike from my stock ECU, as both OMPs sensor's were toasted. From what I gathered during searches, the OMP is otherwise pretty reliable and I now run a PFC. The most common failure point associated with the OMP that I was able to find were the stock lines. Since you have a set of stainless....
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Old 04-08-2008, 01:31 PM   #14
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Quote:
Originally Posted by Signal 2 View Post
You didn't say, but I'm assuming you've got a stand-alone otherwise you must keep it.
I had some trouble with mine but believe now it was likely caused by a freak voltage spike from my stock ECU, as both OMPs sensor's were toasted. From what I gathered during searches, the OMP is otherwise pretty reliable and I now run a PFC. The most common failure point associated with the OMP that I was able to find were the stock lines. Since you have a set of stainless....
Definitely do....just so everyone knows...

Engine Parts:
-Garrett T04R Ball-Bearing Turbo (.84 Turbine A/R)
-HKS R-Type V-Mount Intercooler Kit
-Tial 46mm Wastegate w/ Atmospheric Dump
-Tial 50mm Blow-off Valve
-Modified A-Spec Tuning 4" Turboback Exhaust System
-Exoticspeed Exhaust Manifold
-S&B Powerstack Air Filter
-Koyo Aluminum Radiator
-Pettit Aluminum AST
-Dual 19-Row Earl's Oil Coolers
-Permacool Oil Thermostat
-Pulley Kit for Airpump Removal
-Banzai Racing Blockoff Plates
-Gotham Racing Short Shifter

Fuel System:
-OEM 550cc Primary Injectors
-Bosch 1680cc Secondary Injectors
-K2RD Secondary Fuel Rail
-Aeromotive Fuel Pressure Regulator
-Nippon-Denso (Supra) Fuel Pump
-Hyperion In-Tank Fuel Surge Tank

Electronics/Engine Management
-Apex'i Power FC w/ Commander
-FC-Datalogit (Ver. 2.0)
-Innovate LC-1 Wideband O2 Controller
-Innovate XD-16 Gauge Kit for LC-1
-Greddy Electronic Boost Gauge (52mm)
-Greddy Electronic Water Temp Gauge (52mm)
-Odyssey PC-680 Battery
-Compaq Laptop for Tuning (circa. 1998)

Suspension/Wheel/Brake Modifications
-Lube Groove Delrin Suspension Bushings
-Maval Converted Manual Steering Rack
-Eibach Pro-Kit Springs
-Russel Stainless Steel Brake Lines
-Hawk HP+ Brake Pads (Street)
-Kirk Racing Race Roll Bar
-OMP RS Racing Seats
-G-Force 3" Camlock Harnesses
-Removed PS, A/C, Emissions, Double Throttle, etc.
-Removed Majority of Interior
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Old 04-08-2008, 04:59 PM   #15
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Quote:
Originally Posted by 0110-M-P View Post
Have you tried the Protek-R?
Nope.

The only other pre-mix I might consider using is that one that Jack on the other forum said made the exhaust smell a little better. Sounds goofy but I'd try it to make the exhaust smell better.
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