Hey Guys Howsit?

Just wanted of your opinions on whether i should run premix, not in the general sense like when people removed their oil injection but more as a safety thing i guess. A couple of weeks ago a mate of mine bent and toasted some seals in his FD by not running the right amount of premix over many thousands of kms whether or not that was the actual cause it got me thinking as im just about to go have my FC tuned in the next few weeks and its running the factory oil injection with 15w50 performance mineral weight oil in the sump but because im expecting to put around 300kw at the wheels im wondering if the factory oil injection was ever designed to keep up with this power level which is why i was considering running a lite premix to help or encase **** happens, if it is a good idea what ratio of premix should i run i plan to use the band Motul.

Thanks

 

A bit of 2-stroke oil in the fuel doesn't hurt, especially if you are at that power level. But I believe that when you add oil to the fuel the octane rating is reduced. So a "bit" might be a few ounces per tankful. Good idea to do the final tuning with the fuel/premix ratio that you expect to run on a daily basis.

 

seriously..junk that OMP crap and use half once per gallon premix...

 

Stole the words right out of my mouth.

 

Well with that idea comes more advantages i could run a really good synethic oil, unfortunately the motor has to be pulled a part right? to removed the oil meter pump?

Cheers

 

i thought the general amount to use was 1 ounce per gallon of gas?? thats wat i ran in my 88 TII for about a year and a half, and i never had problems...lol i was running the wal-mart brand supertech 2 cycle oil also...

 

no need to pull the motor apart, or out.
you can get rid of it in very little time using block off kits

 

i just through a half bottle in with every tank, I guess I'm not to scientific about it since i am still running my omp.

 

i use to run an oz per gallon but my engine builder who has been building rotarys for 20 years, said that is overkill so i went with half oz per gallon.

and you most deff do not have to pull the motor to remove the OMP just search the forum and buy a block off plate. its very easy to do..

 

I run 1 oz per gal. I don't think thats too much. Get rid of the omp. If you have a s5 get a rtek chip and get rid of the omp. I just don't trust them as our cars are getting older.

 

Pre-mix, lol. I pre-mixed my old s4, one day I was at the gas station adding my two stroke before putting gas in and got rolled on by a chp. He was convinced I was adding "jet fuel"! No joke. Took me 40 minuted and a haynes manual to keep my car from getting towed.
But I agree with those above, while it may be a pain in winter when you can't feel your finger tips, pre-mix all the way.

 

If you don't have a working or present OMP, it's 1 oz per gallon, or a ratio of 1 part premix per 100 - 128 parts fuel.

If you do have a working OMP, it's 3 to 5 oz per FULL TANK.

 

I have used 1 quart TCW-3 every time I fill my gas tank up, and I use my OMP...I run low 14s all day long on street tires and my engine doesn't smoke, unless I am running over 7500 rpms. and then it stops smoking within 2 seconds.,.I also have over 150,000 on same engine. I also run N.O.S. change oil every 1000 miles and still starts right up. runs perfect like brand new.

 

The point is, while it works, it's completely unnecessary to use that much premix with a working OMP, besides peace of mind.

For DD, I rarely ever use premix since I have a working OMP. I only add it to my car before AutoX and track use.

 

pre mix all the way an oil injector only injects oil in a spot while pre mixing the lubes entire chamber

 

I still have a working OMP, I think. (No idea if all 4 lines are good) Aside from it maybe being a waste of money, is there any harm in using a half a bottle per full tank? That's about 1.2 oz per gallon or 107:1. (I use a lot more in my 2-stroke engines without any problem, but they don't have apex seals) I also don't mind using premium if the oil affects the octane rating. My engine has 117k (still healthy) and I'd like it to last as long as possible. Thanks!

 

wouldnt 5 oz to a full tank pretty much be 1 oz per gallon?? or really close for the working omp??

 

The tank is alot bigger than 5 gallons, so the answere is no.

 

16.0 gallons for the S4
18.5 gallons for the S5

That's from memory so I could be off.

 

Sorry to be a pain, but i wont ask in metric how mch that is but in ratio format what would you recommend? my friends FD which doesnt have the OMP runs a ratio of 100:1 of fuel to premix, i was thinking around 300:1 for mine with the OMP.

Thanks

 

I've been told that with the OMP present to use an ounce of 2-stroke with every 2 gallons of gas, and that with the OMP blocked off to go with an ounce for every gallon...

And I'm feeling the same numbers as you.

16.0 gallons for the S4
18.5 gallons for the S5

 

I didn't know all the same information could be stated so many times in so many different ways... Seems this topic has been beaten to death in this thread alone.

 

You can do a simple calculation to see what the ratio is for 3 - 5 oz per tank.

128 fluid ounces in 1 gallon right? (8 fl oz. in a cup, 2 cups in a pint, 2 pints in a quart, 4 quarts in a gallon, 8 x 2 x 2 x 4 = 128)

When your friend says he's running a ratio of 100:1, he's most likely running a ratio or 128:1, unless he's putting in exactly 1.28 oz of premix for every gallon, that 1.28 oz of premix per gallon being a 100:1 ratio. 100 parts fuel, 1 part premix.

I doubt it, he's probably putting in 1 oz. per gallon, like the rest of the normal folk, which is a ratio of 128:1.

so for 3 - 5 oz per tank, just figure out what a tank is. For simplicity's sake, use S5 fuel tank, since that's what I'm running. 128 * 18.5 / 3 ~ 789, 128 * 18.5 / 5 ~ 474.

The ratio I'm suggesting (and have run in the past) is 474:1 to 789:1, which is about 1 oz of premix per 4 to 6 gallons of fuel (Or for simplicity's sake, 400:1 to 600:1), if you have a working OMP.

300:1 is still too rich of premix, though it's probably not going to hurt you.

BTW, dividing by 128 is a bitch.

 

Cheers guys thanks for your help

 

hi guys,
what hapens if i fit a kit instead the omp and disconnevt the harness? will the ecu return an error code ? i run the stock ecu and i am afraid that if i remove the omp the ecu will return an error and go to safe mode with loss of power. is that correct?
thanks!