Hobao GPX4 Pro
#181
Tech Master
iTrader: (32)
Originally Posted by asar
The GPX-4 is more comparable to the MTX-4 as far as the fuel tank and battery lay-out, but the GPX-4 has lower CG.
The MTX-4 has beter balance, smoother drivetrain and a fast free-wheel even off-throtle. However, it is also more difficult to get a good set-up and has a tendency to oversteer (loose rear end) after 12 to 15 mins of run during race finals.
GPX-4 may be a fraction of a second slower on the inside but more consistent even on 30-45 runs. It's also easier to set-up. Runs at par when drive train belt loosening fixes are made. Cheaper parts is just a bonus.
The MTX-4 has beter balance, smoother drivetrain and a fast free-wheel even off-throtle. However, it is also more difficult to get a good set-up and has a tendency to oversteer (loose rear end) after 12 to 15 mins of run during race finals.
GPX-4 may be a fraction of a second slower on the inside but more consistent even on 30-45 runs. It's also easier to set-up. Runs at par when drive train belt loosening fixes are made. Cheaper parts is just a bonus.
#182
Tech Rookie
Hi all, would like to know what wt rating of diff oil you guys are using for the GPX4? Thanks in advanced.
#183
Tech Apprentice
iTrader: (1)
Asar, this is an awesome practical explanation on the difference between the two. Now I know exactly on what merits to compare the two against when I make my decision.
Thanks so much!
Thanks so much!
Originally Posted by asar
The GPX-4 is more comparable to the MTX-4 as far as the fuel tank and battery lay-out, but the GPX-4 has lower CG.
The MTX-4 has beter balance, smoother drivetrain and a fast free-wheel even off-throtle. However, it is also more difficult to get a good set-up and has a tendency to oversteer (loose rear end) after 12 to 15 mins of run during race finals.
GPX-4 may be a fraction of a second slower on the inside but more consistent even on 30-45 runs. It's also easier to set-up. Runs at par when drive train belt loosening fixes are made. Cheaper parts is just a bonus.
The MTX-4 has beter balance, smoother drivetrain and a fast free-wheel even off-throtle. However, it is also more difficult to get a good set-up and has a tendency to oversteer (loose rear end) after 12 to 15 mins of run during race finals.
GPX-4 may be a fraction of a second slower on the inside but more consistent even on 30-45 runs. It's also easier to set-up. Runs at par when drive train belt loosening fixes are made. Cheaper parts is just a bonus.
#184
Originally Posted by NoobRC
Hi all, would like to know what wt rating of diff oil you guys are using for the GPX4? Thanks in advanced.
#186
Tech Elite
iTrader: (9)
hey all,i like the look of this car alot would this car with os tz12 be competitive in the nitro touring class with a half decent driver how often do you guys go through tires.when i raced i could use a pair of GQ foams for like 2+ race meets and practice.how much do tire truers go for?does anyone know where i can get a review on this car i like it alot?
#187
Actually, one big advantage of the GPX-4 is durability. It is THE TANK.
MTX-4 has two weak points:
1. The carbon fiber rear shock and body mount breaks.
2. The chasis bends on hard impact due to a weak point on the chasis middle area where the battery hole and two screw holes on both sides are located.
But I am sure Mugen Seiki will address these weak points with hop-ups or upcoming Prospec version.
MTX-4 has two weak points:
1. The carbon fiber rear shock and body mount breaks.
2. The chasis bends on hard impact due to a weak point on the chasis middle area where the battery hole and two screw holes on both sides are located.
But I am sure Mugen Seiki will address these weak points with hop-ups or upcoming Prospec version.
Originally Posted by Hammer0412
How about actual experience on the durability of this car? I heard the MTX4 is a veritable tank...definitely a big plus. Is the HoBao far behind?
How about weight?
Cheers to all!
How about weight?
Cheers to all!
#188
Weak
weak point of chasis is where the 2 battery cover screws are located with 2 other screw holes.
#189
Rear mounts
When bumped hard from behind or hard impact flip over the rear carbon fiber shock and body mounts breaks.
#190
Tech Apprentice
iTrader: (1)
Asar, you have been a wealth of input! I no longer have any apprehensions of saving a few coins and purchasing the GPX4 Pro.
I'm sure a lot of people interested in this car are also learning a lot from you and the other veritable fountains of information on this thread.
Kudos to you and regards to all!
I'm sure a lot of people interested in this car are also learning a lot from you and the other veritable fountains of information on this thread.
Kudos to you and regards to all!
#191
Originally Posted by NoobRC
Hi all, would like to know what wt rating of diff oil you guys are using for the GPX4? Thanks in advanced.
#192
Tech Rookie
Originally Posted by mykel chua
hi im using 30,000WT for the rear diff anf 100,000 for the front. im going to rebuld my rear diff in a few days and will put 10,000WT in it.
Can u gurus advise me on what factors that will determine the wt of oil to be used?
On a different question about the GPX4, before running the car on the track (when it is cool), i noticed that when i spin one of the rear wheel, the other side will spin opposite direction. I understand this is the action of the diff right? But after running a few laps on the track, when i spin one of the rear wheel, both the rear wheel will rotate the same direction. Is this normal? Hope u guys can enlighten me...
#193
Originally Posted by NoobRC
Hi, i'm still new to nitro r/c. I was told to use 30,000 wt in front and 10,000wt in the rear by one of the hobbyst. When i asked my lhs he gave me a funny look. He then told me that 30,000 was too thick!. I'm puzzled to this as now i find out that even 100,000 wt oil is used.
Can u gurus advise me on what factors that will determine the wt of oil to be used?
On a different question about the GPX4, before running the car on the track (when it is cool), i noticed that when i spin one of the rear wheel, the other side will spin opposite direction. I understand this is the action of the diff right? But after running a few laps on the track, when i spin one of the rear wheel, both the rear wheel will rotate the same direction. Is this normal? Hope u guys can enlighten me...
Can u gurus advise me on what factors that will determine the wt of oil to be used?
On a different question about the GPX4, before running the car on the track (when it is cool), i noticed that when i spin one of the rear wheel, the other side will spin opposite direction. I understand this is the action of the diff right? But after running a few laps on the track, when i spin one of the rear wheel, both the rear wheel will rotate the same direction. Is this normal? Hope u guys can enlighten me...
#194
I've been very happy with the combination of 100k front diff and 30k rear diff. My times at my track are getting more consistent every week. I shimmed the transmission on the front pulley of the car and it rolls a whole lot smoother. Other changes that I made are side belt = Mugen, front belt = kawahara low friction belt, and the rear belt = Kyosho Sp belt. The brando belts are less then desired. Hope to have a successful outing. Thanks for all the information posted so far, this is a great reference tool.
#195
My GPX4..