A friend from the country (Moora) came for a drive to the big smoke this weekend for a maf tune on his ute after having already fitted extractors, exhaust and then getting the dreaded check engine light from the now out of factory spec exhaust gases.

With the car strapped to the dyno,  the car made a best of 302.9hp from the 3 factory tune dyno pulls with the car riding the low octane spark map the entire time.

Then it was time to fit the new OTR & infill panels & adjust the tune to suit.

The car seemed a little low on power compared to previous 6lt motors I’ve tuned, so the question was asked, “what fuel is in this?”

“Just plain unleaded”

ha, right, that would explain it then.

Regardless of the lower octane fuel, we still made a nice healthy 48whp gain as can be seen by the dyno sheet.

Once the car is filled up with some 98 octane fuel the car will start to learn towards the higher octane spark map and pick up some more hp.