All

I'm having my ECU tuned with mazdaedit and there's the option to increase the OMP rate. The recommended increase is 7%, but I also already premix 1/2oz idemitsu per gallon when racing.

Would you all recommend sticking with what I'm doing now, or increasing the OMP by 7% and continuing to premix all the time, or increasing the OMP and only premixing at the track?

Since I'm almost exclusively doing HPDE and time attack, hopefully that keeps deposits at bay.

 

7% of not much is still not much why not just use 1.07 oz/gal and skip the map ... just to get your head thinking about what all this really means

I don’t really agree with a blanket x% value. First, the map is load based and it’s already maxed out in the high load area. Second, the amount you may want to increase it at lower loads like idle might need to be different than the amount you may want to increase it at higher loads.

So just adding a blanket x% is really no different than just adding more premix because it adds that much more everywhere rather than maybe targeting one area more than the other ...

 

Especially if the OMP is feeding engine oil, increasing premix makes more sense. Not that there is a downside to increasing the OMP rate, it's just not solving the problem.

 

I would go with increasing the omp and just using premix at the track .
I typically increase by 10% where possible (60 is max setting) plus target the cruise range (37% load 2000-3000) specifically, going from 3 to 4 (33% increase). That is the range where the engine spends most of it's time when on the freeway and i believe it's a hole in Mazdas' map .

 

Disabling the OMP could be risky, especially for daily driving. I've heard mixed things about it. Maybe start with adding premix while keeping the OMP?

 

The Mazda Pro Formula (STAR) race cars never used one, just premix. Same that Daryl Drummond recommended; block off plate on the cover, threaded Allen plugs in the rotor housing injector holes, 1 oz/gal min premix.

the biggest problem is over-revving, don’t exceed 8,700 rpm no matter what Mazda says and keep EGT below 1650°F.

13.0 AFR is the NA Renesis sweet spot, running richer only increases internal carbon deposits. use -11 spark plugs, 100 octane fuel
.

 

My EGT read 1688°F when i push very hard...
However, adding oil by OMP it will reduce the EGT?
It's normal to read 1600°F using cruise control at 4000RPM?

 

The OMP doesn't push enough oil to affect EGTs.
The O2 sensor doesn't have a temperature sensor per se, it calculates temperature from other factors and I wouldn't rely on it too much. 1600 is in the normal range though. This is why aftermarket cats don't live long.

 

what max rpm is “pushing it hard”?
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