How many gallons per hour

[joefish]

We ran the Chumpcar 24 hour race last weekend and burned 7.5 gallons per hour. To me that seems like a lot. A frend of mine races a vg3.3 and only burns 5 gph. Any thoughts on this. Our engine is a 91 ka24de that is stock fresh rings and berrings and head. We installed a new narrow band o2 sensor.

We did finish 8th overall only one small problem the dist. went bad lost about 26laps replacing that.

[Def]

Sounds about right to me. My S13 at a little above 300 rwhp will do that in about 30-35 mins of track time.

[Matt93SE]

My stockish NA KA burns 6 gal in a 40 minute race, so you're in the ballpark.
You could lower the revs to gain efficiency, but you'll go slower doing it.

[joefish]

thanks tor your input....I guess that is the way it is,,,,,

[Empire]

without better tuning, that's about as good as it is going to get.

[joefish]

UPDATE,,We changed the MAF just to try something and the gph went down to 5.5

[gills]

UPDATE,,We changed the MAF just to try something and the gph went down to 5.5

Did you replace the MAF with one from a different car or just a new unit?

[Matt93SE]

What happened to your AFR when you did that?
Sure, run it lean as hell, lose power, and possibly burn pistons.. it'll get great mileage!

[joefish]

The MAF came out of another car from pic and pull

I have no idea what the AFR is we just have a stock computer no way to tune But the rear bumper where the exhaust comes out the white paint is very dark almost black I am guessing thats unburned fuel. I will say I thought the engine ran better and made more power.

[Matt93SE]

yeah.. stick a wideband O2 sensor on there and see what you're actually getting.