improve fuel milliage of os xz-b max
06-11-2011, 06:12 PM
#16
R/C Tech Elite Member
Do you have a throttle return spring? Sometime, the throttle linkage binds and makes the carb not closed fully.
06-11-2011, 11:14 PM
#17
06-12-2011, 05:34 AM
#18
Tech Master
iTrader: (47)
I have always found that I could get better run times with
my nitro engines by running a colder glowplug. I'm just
wondering why most everyone is running the ultra hot
P3 plugs in these engines ? Especialy a few of you guys,
that I know have been running and tuning nitro engines
for quite a while now.
Don't get me wrong, I know there are times when the
weather conditions require a hotter glowplug to get a
nitro engine dialed in properly.
my nitro engines by running a colder glowplug. I'm just
wondering why most everyone is running the ultra hot
P3 plugs in these engines ? Especialy a few of you guys,
that I know have been running and tuning nitro engines
for quite a while now.
Don't get me wrong, I know there are times when the
weather conditions require a hotter glowplug to get a
nitro engine dialed in properly.
06-12-2011, 09:44 AM
#19
What will be the gain in time if i use a p4 plug ?
Which is the rule of thumb on summer time you run p4 and on winter time
you run P3 plugs?
What will be the difference in changing plugs ?
The LSN and HSN needles need to be leaned when I change to P4 plug ?
Which is the rule of thumb on summer time you run p4 and on winter time
you run P3 plugs?
What will be the difference in changing plugs ?
The LSN and HSN needles need to be leaned when I change to P4 plug ?
06-12-2011, 10:04 AM
#20
I have always found that I could get better run times with
my nitro engines by running a colder glowplug. I'm just
wondering why most everyone is running the ultra hot
P3 plugs in these engines ? Especialy a few of you guys,
that I know have been running and tuning nitro engines
for quite a while now.
Don't get me wrong, I know there are times when the
weather conditions require a hotter glowplug to get a
nitro engine dialed in properly.
my nitro engines by running a colder glowplug. I'm just
wondering why most everyone is running the ultra hot
P3 plugs in these engines ? Especialy a few of you guys,
that I know have been running and tuning nitro engines
for quite a while now.
Don't get me wrong, I know there are times when the
weather conditions require a hotter glowplug to get a
nitro engine dialed in properly.
a hot plug however will give a better idle, better pick up (low end responce) and a bigger tuning window. These are the things most people are looking for in a glowplug (offroad - also colder or humid weather will require a hotter plug).
06-12-2011, 12:28 PM
#21
+1, a colder plug will allow/require a leaner setting = more run time and usually more power.
a hot plug however will give a better idle, better pick up (low end responce) and a bigger tuning window. These are the things most people are looking for in a glowplug (offroad - also colder or humid weather will require a hotter plug).
a hot plug however will give a better idle, better pick up (low end responce) and a bigger tuning window. These are the things most people are looking for in a glowplug (offroad - also colder or humid weather will require a hotter plug).
Probably i will need to retune the engine right ?
My current settings are HSN 2 + 3/12
LSN 5,5 turns
What do you recone, I should lean or richen the engine ?
06-12-2011, 01:04 PM
#22
I just got back from the Mugen Nitrocross race in Germany.
I couldend drive myself so i went out there to help out fellow OS drivers with tunning and pitting.
The 5 guys there from Holland and Belgium i helped ran the OS XZ-B speed with the 2060 pipe, one guy ran the Losi RE11.
The fuel used was Merlin, Tornado and Meccamo, all the engines in buggy went between 8:00 and 8:30 for pitstops in the finals, lap times were around 38-40 seconds, speed was also quit equal allthough different brands off fuel were used.
The needle settings for all the engine were around 2 turns on the highspeed and 5-5.5 turns on the lowspeed needle from close.
The one guy that ran truggy went 10 minutes with ease.
This was een european high speed track, for reference all aother brands went in for fuel between 7 and 8 minutes this was in pro buggyclass so no poor tuned engines.
Finals were 60 minutes, no flame outs from the engine one guy hat clutch gone bad and one guy made a major crash witch stalled the engine, afther restart no problems at all.
Results were, 2e place truggyclass, 3e place hobbyclass, 6th place expert class afther one flame out du to the crash.
Race winner was Michael Pallson from Sweden also running the speed XZ-B, pitting at a whopping 9- 9:30 in the expert final.
So yes, i do think that or the 9901 pipe kills fuel mileage on your XZ-B or youre tune is way out off whack.
Get a 2060 on there and you should see similair fuel mileage to what we are getting.
I couldend drive myself so i went out there to help out fellow OS drivers with tunning and pitting.
The 5 guys there from Holland and Belgium i helped ran the OS XZ-B speed with the 2060 pipe, one guy ran the Losi RE11.
The fuel used was Merlin, Tornado and Meccamo, all the engines in buggy went between 8:00 and 8:30 for pitstops in the finals, lap times were around 38-40 seconds, speed was also quit equal allthough different brands off fuel were used.
The needle settings for all the engine were around 2 turns on the highspeed and 5-5.5 turns on the lowspeed needle from close.
The one guy that ran truggy went 10 minutes with ease.
This was een european high speed track, for reference all aother brands went in for fuel between 7 and 8 minutes this was in pro buggyclass so no poor tuned engines.
Finals were 60 minutes, no flame outs from the engine one guy hat clutch gone bad and one guy made a major crash witch stalled the engine, afther restart no problems at all.
Results were, 2e place truggyclass, 3e place hobbyclass, 6th place expert class afther one flame out du to the crash.
Race winner was Michael Pallson from Sweden also running the speed XZ-B, pitting at a whopping 9- 9:30 in the expert final.
So yes, i do think that or the 9901 pipe kills fuel mileage on your XZ-B or youre tune is way out off whack.
Get a 2060 on there and you should see similair fuel mileage to what we are getting.
06-12-2011, 09:42 PM
#23
Thank you for the answer, that was very helpful....
As I can see my settings are not way out....
Next weekend I will try the 2060 pipe!!
Do you install fuel filters or pipe cooler in order to achieve better fuel economy ?
As I can see my settings are not way out....
Next weekend I will try the 2060 pipe!!
Do you install fuel filters or pipe cooler in order to achieve better fuel economy ?
06-12-2011, 09:59 PM
#24
Do you install fuel filters or pipe cooler in order to achieve better fuel economy ?
They're not necessary IMO. Try an 8mm restrictor, P3 plug with the 2060 and you should have no problem getting 10+ min.
They're not necessary IMO. Try an 8mm restrictor, P3 plug with the 2060 and you should have no problem getting 10+ min.
06-13-2011, 02:38 AM
#25
10+ minutes realy depends on the track layout and the speed and trothle control off the driver, how many times do you realy see the top guns in RC pit at 10 minutes, over here in europe we dont see that.
On our tracks and you can pit in the finals between 8-9 minutes in a buggy, you have a very fuel efficiant engine and the OS XZ-B is on that small list off engines i see doing that.
I run a mugen MBX6 and MBX6T and only use the stock fuel filter and no extra long fuel line 30 cm is all, pressure line from tank to the exhaust is around 20 cm.
On our tracks and you can pit in the finals between 8-9 minutes in a buggy, you have a very fuel efficiant engine and the OS XZ-B is on that small list off engines i see doing that.
I run a mugen MBX6 and MBX6T and only use the stock fuel filter and no extra long fuel line 30 cm is all, pressure line from tank to the exhaust is around 20 cm.
06-13-2011, 07:28 AM
#26
10+ minutes realy depends on the track layout and the speed and trothle control off the driver, how many times do you realy see the top guns in RC pit at 10 minutes, over here in europe we dont see that.
On our tracks and you can pit in the finals between 8-9 minutes in a buggy, you have a very fuel efficiant engine and the OS XZ-B is on that small list off engines i see doing that.
I run a mugen MBX6 and MBX6T and only use the stock fuel filter and no extra long fuel line 30 cm is all, pressure line from tank to the exhaust is around 20 cm.
On our tracks and you can pit in the finals between 8-9 minutes in a buggy, you have a very fuel efficiant engine and the OS XZ-B is on that small list off engines i see doing that.
I run a mugen MBX6 and MBX6T and only use the stock fuel filter and no extra long fuel line 30 cm is all, pressure line from tank to the exhaust is around 20 cm.
You were absolutely right!!!
It is a different engine that i drive now!!!
That was fantastic I could not believed it!!!
I gain 1 minute of run time easily!!!
Also the tune of the engine is overall much better.
The low end performance is great now, I do not know if i need to richen the LSN. As far as the temp of the engine after 2 tanks was 230 degree with ambient temp 77.
At the end of the practise I let the engine idle for 5 minutes with very few blips on the throttle and the temp was 205, is this normal?
06-15-2011, 10:26 AM
#27
If I change the fuel that I use, same brand same oil content but instead of 25% nitro 30% shall I run in again the engine?
What will be the pros and cons of that change?
What will be the pros and cons of that change?
Last edited by mike80; 06-15-2011 at 12:05 PM.
06-15-2011, 12:04 PM
#28
06-16-2011, 02:24 PM
#30
Yes this is very normal and a good sign your tune is correct. All the time you engine is idling it should be cooling (down to a certain point), otherwise if your engine doesn't cool at idle on and off throttle action will push temps higher and higher. If it's cooling like you describe it's near perfect on the LSN.