RB30 Facts, Figures and Helpful Hints

[mudnut]

An update on Fuel economy. The Old Trol achieved 15.94 lt/100km almost fully loaded and towing my small camp trailer. I sat at roughly 95-100kmh in 4th gear, and the engine ran all day long at 2800-3000 rpm. Even with the weeping radiator the temp remained at around the third way up the gauge, so I am happy with the overall performance of this little engine.

[dom14]

An update on Fuel economy. The Old Trol achieved 15.94 lt/100km almost fully loaded and towing my small camp trailer. I sat at roughly 95-100kmh in 4th gear, and the engine ran all day long at 2800-3000 rpm. Even with the weeping radiator the temp remained at around the third way up the gauge, so I am happy with the overall performance of this little engine.

Yep, that is pretty unreal, but I believe ya. It is over 6km/L with a heavily loaded troll.
No doubt it's a pretty damn good fuel economy you've produced above.
May be it has something to do with the excess temperature the engine's running atm?!

In mine, temperature gauge has never gone above half way, and when it does, I have an immediate hissy fit.

I'm into the mission of getting the best fuel economy out of mine & tuning it for the best balance between performance & economy.
I'm going to have to stay in touch with you a fair bit.

[GQtdauto]

Geez that's good economy , didn't realise you could safely rev them that hard , had ours up to 90 rarely because of the high revs but did note better consumption at around 2800 and 85-90 Kay's .
As a matter of fact it's not long been serviced and is chewing more than that .

[mudnut]

The Dyno-guy told me, that the RB30 is designed to rev, rather than lug to produce its power. At 100km in 5th, the revs are a little above 2600rpm. The old 4 pot Magna was pretty close to 2800 to 3 grand at 100. I would've liked to sit at around 90kmh, but I had to reach the city before 1:30, so I didn't get trapped on the Ring road. (It was a parking lot anyway, and the average speed was around 5kmh). On the sand, I have no qualms with sitting on 4000 rpm for the soft stuff. The redline on these things is right up there at 5500 and up.

I run a heavier grade oil than specified, as well. 4th is the strongest gear and towing in 5th isn't recommended. I was cringing at the higher revs, but just relaxed after the first couple of hundred ks and let it do its thing.

[mudnut]

Yep, that is pretty unreal, but I believe ya. It is over 6km/L with a heavily loaded troll.
No doubt it's a pretty damn good fuel economy you've produced above.
May be it has something to do with the excess temperature the engine's running atm?!

In mine, temperature gauge has never gone above half way, and when it does, I have an immediate hissy fit.

I'm into the mission of getting the best fuel economy out of mine & tuning it for the best balance between performance & economy.
I'm going to have to stay in touch with you a fair bit.

Remember, Dom, I have the headers fitted, blocked the preheat (for the warmer months only) and removed the heater grid under the carby. I also only run 31" tyres at 35psi.

[dom14]

Remember, Dom, I have the headers fitted, blocked the preheat (for the warmer months only) and removed the heater grid under the carby. I also only run 31" tyres at 35psi.

Yeah, I'm sure headers help, but I reckon it has lot to do with the good dyno tuneup as well.
I also think your carby is in tip top condition.

[Patrol'n]

I agree with Dom, it must be really well tuned!

Mine is actually running really nicely now, but at last fill it used about 22 litres per hundred...

Mind you, it has a highish rhino roof rack, something like 2 inches of lift... 32 inch aggressive AT tyres etc, but I still think it could do with a damn good tuneup based on those fuel figures

[mudnut]

The carby was rebuilt by the Dyno guy last year. Your roof rack acts like a boat anchor.

[Patrol'n]

how many litres per hundred do you think the roof rack would add? I always figured it would add drag, but I've always thought a litre or two per hundred... Maybe I've always been wrong. Lol, wouldn't be the first time

[mudnut]

Its hard to say, there is that and as you've written, running the larger tyres as well, will put a lot of pressure on the drive train. Remember sticking your hand out the window as a kid. There was quit a lot of wind resistance to push against at the 100kph. You are also having to accelerate that little bit harder with the weight of the roof rack, and steel bar bull bar, if you have one.

Did I also mention my camper is based on a small trailer?