I currently drive a 88 rx7 with an S5 n/a motor. I am going to be auto crossing it, I also use it as a DD. I was wondering if i should use premix in the tank before i race it. I still have my omp hooked up but i drive my 7 kinda hard. I was wondering if anyone could give me some insight on the situation. Thanks.

 

Without typing a book on the subject, the simple answer is 'if you want to'. If you are worried about it then yes but dont add very much as it will just smoke more and cause excess carbon buildup. If you search around you can find a good idea of how much to add.

 

with out the omp i run 1 ounce of 2 stroke oil to 1 gallon of gas. with the omp working i would leave it alone since its na. if it was a turbo i might think about adding some but you dont make as much heat as a turbo motor. if you decide to premix make sure you use oil that has tc-w3 in it, safe for injectors.

 

Thanks guys...

 

From what I have heard it is in the upper rpms where the stock OMP does not supply an ideal amount of lubrication for the seals. Since this will likely be the conditions you are operating under, it wouldn't be a bad idea to try some premix on race days. I don't know what amount you would want to use however since I don't have an OMP

 

hey my pre mix is 120 mills to 20 litres and 180 mills to 20 litres for racing

 

Are you running an OMP?

 

dont bother premix unless you remove the omp

 

That's not necessarily true. The metering oil pump is perfectly adequate for most driving conditions but if the car is being tracked, autocrossed or otherwise raced, a little premix will be a good insurance policy. Under those conditions the engine is building more heat and under more stress then Mazda intended.

 

honestly if it is being tracked and raced, then i wouldnt be running the omp and would just be premixing completely. I wouldnt be trusting my engine to that if it was constantly being tracked.

 

OK. What's involved in removing the OMP?

 

no matter what you should always premix a rotary.. this is why im able to maintain 400rwhp+ and still retain over 130000 miles without showing signs of stress

use protek-r

great ****

i was once told by steven that even salad dressing would be better than putting nothing in there to lubricate them seals.

 

i dont run a omp i dnt really like them, not they they aint good! but id rather mix my fuel and know that its getting done thats just me hahaha and

blocking off the omp is easy peasy just locate it on the exhaust side of the engine , it has two bolts and will have two feeds going up to the carb, undo the unit an place a block off over it with a gasket aswell you can buy them from rotary shops or wat not, and for the carb just run a hose from one oil feed to the other!

sum oil mite be lost

 

If the car is primarily a daily driver, then it makes more sense to just premix when on the track as opposed to the hassle of constantly premixing.

Who is Steven?

Mazda found the metering oil pump perfectly necessary on their street cars and many of their racing efforts. My engine has well over 13000 miles, well over 400HP and is still running the metering oil pump. It is an endless debate whether premix is actually better since no one has done any scientific testing (outside of Mazda).

 

http://www.trademe.co.nz/Trade-Me-Mo...-236911356.htm

 

I am however running a 88 omp set up on a 91 na in an 88 car... I dont know how much i trust it to do its job right when i am running it hard... But that is just because of the swap...

 

There might not be any scientific proof that premixing is better, and there are a lot of debates on the topic.

Personally, I use both OMP and premix.

I kept my OMP (I have an FD btw) because the OMP puts oil right onto the apex seal's edge as it travels around the housing. Premix will lubricate, but it's not injected straight onto the apex seals like the OMP does.

Because I am injecting using the OMP I decided to go with Idemitsu oil, since it was designed for the rotary engine I figured why not. That alleviates issues of using a separate 2 stroke tank solution.

I bought a case of protek in convenient 4 oz bottles and keep a few of the little suckers in a case in my glove compartment. Once you go through your protek you can always fill them up with any desired 2 stroke oil. Idemitsu also makes a really good premix.

No hassle at all, pull into gas station, get out, pop in a 4 oz bottle, fill up, go on your way. The gas comes out under high pressure so the oil will get mixed really well.

Results? Nothing scientific, but a VERY noticeable effect on how smoothly the engine runs now.

 

nice!!! and just remember what oil to use , do not use air cooled 2 stroke oil use out board 2 stroke for watercooled aplications!

my mate actualy opened his omp out so it puts a bit more oil in, considering he went full bridg port and its turbod