I just got done removing the mop after deciding to premix and I'm about to start putting things back together but I just thought of something. My car is currently sitting at a quarter tank of gas. Would it be safe to drive it to the gas station and premix there or should I premix in a container and then put the fuel in the car?

 

Premix at your house just to be safe.


How far is the gas station from your house?

 

This^

Sometimes I premix at my house before heading to the gas station If I don't feel like doing it there.

 

No . That's crazy. Put in about .25 oz in there before you start
the car.
I've always used 1 oz per galloin last 10+ years and never fouled my plugs.
No issues on dyno or any indication of hesitation anywhere in the rpm range to redline.

 

And...make sure to use TCW3 premix ....ONLY.

 

What is TCW3 premix? I add some to the gas, even though I have my oil pump on and working. I get it from the chainsaw shop, it comes in tubes..

 

TCW3 certification is an NMMA trademark. All 2 stroke oil is bench tested for carbon build up, fluidity, miscibility, rust, compatibility and give it the label on bottles .

When you look at 2 stroke bottles, it's not a small print, it has a print TC-W3 clearly printed on it. Even WalMart 2 stroke has it.
It won't hurt to use non TCW3 as a back up if you're out of oil, but I'd use that as a back up only.

 

The reason I am so **** about oil/ gas/and 2 stroke is when I broke down a motor with 25,000 miles (using OMP), I couldn't believe the amount of carbon on the rotors. The next day I pulled out the OMP and went strictly premix.

I don't know how much 2 stroke you're using but OMP and 2 stroke may be overkill.

 

I think people run both because

A) In case they forget to pre mix by accident
B) think having both is better than using just one or the other
C) too cheap or too lazy to remove the stock omp and block it off
D) think running only pre mix will cost too much money
E) all of the above

Personally I plan on running premix only, I see no reason to use the stock omp and premix- If you can remember to do it and can afford to do it, why wouldnt you ?

Bottom line - If you can afford to drive an rx7 how can you not afford to use pre mix?

Just buy a case and you're set for a while.

 

rule of thumb is roughly one ounce of 2 stroke per gallon.
1/4 tank?..use 3 ounces..that will be nice and safe,whether it is a S4 or S5.
which car do you have?,as the tanks are different size.

 

If he did pre mix before leaving, would it settle and go to the bottom of the tank? Just curious as to where the fuel and oil usually goes when mixed together. Obviously putting the pre mix in first is ideal.

Just makes me think of making a mixed drink, alcohol first. Lol

 

LOL.
It actually mixes pretty well. ...at least TCW3 oils do. The oil is made to mix with
fuel. If you pour some fuel into a glass jar and drop some TCW3 in there, you'll see what I mean. I wanted to see how well it mixes . Yes, I am ****.
And when you drive over bumps and making turns ...you know what happens.

 

From what I have read about premix ratios, isn't 1oz per gallon a bit overkill for street use? I had thought reading that 1/2oz per gallon is fine for the street use and 1oz per gallon is better for high load / high demand of track use.

 

I'm **** too, I like to over analyze. I hope I get this stud fixed soon on my Turbo so I can start putting my engine together.

I hear lots if things about idemitsu pre mix, its used at only half oz per gallon from what I read. Do you know anything about this stuff?

Just wondering how advantageous it us to use that stuff over other pre mix, I don't mind going through the hassle of getting it. The half oz per gallon thing makes me wonder though. The fact that its designed for rotaries though is pretty nice.

 

you normally use half ounce only if you are running a working omp also.

Some people use 2 oz per gallon when racing at the track.

 

The car is an 89 GTU. From what I've read I was planning to go with an ounce per gallon after deleting the omp/mop. The main thing I'm wondering about is if I should add some oil in the tank for the 1/4 tank that's still in there or just premix what I'm going to be adding in. At the moment still waiting for my ECU to come back from digital tuning, today being the estimated delivery date.

 

Ok, let's figure you have about 4 gallons of gas in your tank at 1/4 on the gauge.

Put five ounces of premix oil into a gas can, fill said gas can with a gallon of gas.

Pour mixed gas into gas tank.

Issue resolved. Don't drive your car for any amount of time without lubrication. Would you run it with the oil pan dry?

 

Before you start to remove the OMP, you need to realize you cannot disconnect the OMP connector with stock ECU because it will go into safe mode(won't rev past 4k rpm) unlike S4.
So, you have 2 choices. Use the OMP with 2 stroke or block off the OMP , leave the connector on and zip tie it out of the way.

And no...you cannot jumper the connector .

 

I think that it would separate once the Ice Cubes melt..
On another note,what happens when your lawnmower sits with fuel in it?..does the oil and gas separate?..better keep an eye on that!...
(Experiment of the day: a chicken with a dozen eggs inside it will dance in the microwave if put on high!)

 

I did some calculations on the oil consumption rate and gas mileage for my S5 n/a. Based on those numbers, the stock OMP is metering out oil at about an average rate of 1/2oz of oil per gallon of gas burned or 1:256 ratio overall. Now on long highway trips that rate drops to 1:400 ratio and raises to as high as 1:128 or more at track day events.

So if I were to start to premix just as an insurance measure, I would most likely do it at a rate of say 1/4oz per gallon. That would be a 50% increase compared to what the S5 OMP is already doing. If I were to premix at 1/2oz per gallon that would be double what the OMP is currently doing - which maybe what I would do for track day event.

 

I just ordered 4 quarts of idemitsu premix to get me started when I get my car running