Hpi Pro 4
Tech Elite
iTrader: (32)
I have some used pro4 parts im looking to get rid of. I bought a partial car for the spares that would fit the cyclone. I have a one way, some diff gears, chassis, top deck, motor mount, input shafts for the diffs with bearings, shaft, front and rear towers etc etc. If anyone is interested please pm me and I will get some pics taken.
Super Moderator
iTrader: (81)
Just wanted to let everyone know that we decided to take an additional 25% off our prices on remaining Pro 4 parts. Get them while they last.
Kraig
KT Hobbies
Kraig
KT Hobbies
Diff Slipping
Hi guys, I am running the novak 4.5 bl setup in my pro4 and my rear differential starts slipping after 2 packs. I re-tighten it again and the same thing happens. I was using the 5.5 motor previously with no such problems. Anyone with solutions to this? Will the heavy duty differential screw nut...that comes standard in the pro4 2005 solve this problem? My pro4 is the older v1.1.
Thanks.
Thanks.
Tech Addict
iTrader: (4)
Voila! ... problem solved.. kind of.
I had a few moments before the start of the grand prix to tear the drivetrain apart, in went a new shaft (the "old" one was still very new - still true..), new pins, rebuilt the spur + layshaft assembly, re shimmed front and rear diffs...
Chucked a pack in and Bam. the shaft vibrated just as badly, and scratched itself up! (BOo HOoo..)
so i redid it, but swapped the front diff to a one-way and not it's smooth. I checked the outdrive on my spool and surely enough, they're pretty worn. So, all a case of the fron diff outdrives? perhaps.. i think it's just that the spool is so harsh. My cvd's are still pretty devoid of wear..(TiR units). so i guess the vibration is being passed on through the spool?..
anyhoo.. i'll just go back to running the one-way. (I prefer the one-way but the spool is nice too. It's just so stable..)
I had a few moments before the start of the grand prix to tear the drivetrain apart, in went a new shaft (the "old" one was still very new - still true..), new pins, rebuilt the spur + layshaft assembly, re shimmed front and rear diffs...
Chucked a pack in and Bam. the shaft vibrated just as badly, and scratched itself up! (BOo HOoo..)
so i redid it, but swapped the front diff to a one-way and not it's smooth. I checked the outdrive on my spool and surely enough, they're pretty worn. So, all a case of the fron diff outdrives? perhaps.. i think it's just that the spool is so harsh. My cvd's are still pretty devoid of wear..(TiR units). so i guess the vibration is being passed on through the spool?..
anyhoo.. i'll just go back to running the one-way. (I prefer the one-way but the spool is nice too. It's just so stable..)
Tech Elite
iTrader: (26)
Pro 4 Diff Rear
Hello fellas! Just got a pro 4, and love it. One problem through....the stinking rear diff melted on me!!! I run a Sphere comp ESC w/ Neo One 4 star brushless motor...are the diffs this fragile? The car just wouldn't accelerate, and when I opened the diff case, it smelled as if something burned. Sure enough, the diff out drives rings melted. Does HPI make metal or aluminum diffs. Maybe the Cyclone rear diff outdrives can be used? What do you suggest?
Super Moderator
iTrader: (239)
Originally Posted by yyhayyim
Hello fellas! Just got a pro 4, and love it. One problem through....the stinking rear diff melted on me!!! I run a Sphere comp ESC w/ Neo One 4 star brushless motor...are the diffs this fragile? The car just wouldn't accelerate, and when I opened the diff case, it smelled as if something burned. Sure enough, the diff out drives rings melted. Does HPI make metal or aluminum diffs. Maybe the Cyclone rear diff outdrives can be used? What do you suggest?
ygpm
Tech Master
Originally Posted by yyhayyim
Hello fellas! Just got a pro 4, and love it. One problem through....the stinking rear diff melted on me!!! I run a Sphere comp ESC w/ Neo One 4 star brushless motor...are the diffs this fragile? The car just wouldn't accelerate, and when I opened the diff case, it smelled as if something burned. Sure enough, the diff out drives rings melted. Does HPI make metal or aluminum diffs. Maybe the Cyclone rear diff outdrives can be used? What do you suggest?
I'm sure that even if your motor gets really hot, it still won't damage your diffs. Because it will melt the plastic bevel gears first in case it reaches the diffs. Check your diffs because it might be to tight and that may have caused the melting of the outdrives. If it's too tight, the bearings won't freely spin arund the diff rings and that will create a lot of friction that will lead to over heating.
Tech Master
Originally Posted by diesel
Hi guys, I am running the novak 4.5 bl setup in my pro4 and my rear differential starts slipping after 2 packs. I re-tighten it again and the same thing happens. I was using the 5.5 motor previously with no such problems. Anyone with solutions to this? Will the heavy duty differential screw nut...that comes standard in the pro4 2005 solve this problem? My pro4 is the older v1.1.
Thanks.
Thanks.
Tech Elite
iTrader: (26)
PRO 4 Rear diff
OK. THanks...how tight should they be when running brushless NOvak 4.5 motor or equivalents? Should I tighten them as the book says, or is it just a matter of testing it out untill I see that it works? Also, what the difference between the standard pro 4 rear diff black composite outdrives versus the white delrin outdrives? I ahve to get new diffs and would like to know which to get- which is the best quality and stronger material?
Tech Master
Originally Posted by yyhayyim
OK. THanks...how tight should they be when running brushless NOvak 4.5 motor or equivalents? Should I tighten them as the book says, or is it just a matter of testing it out untill I see that it works? Also, what the difference between the standard pro 4 rear diff black composite outdrives versus the white delrin outdrives? I ahve to get new diffs and would like to know which to get- which is the best quality and stronger material?
The difference of the stock outdrives from the delrin is toughness The delrin outdrives are much stronger. Very reliable.
Tech Elite
iTrader: (26)
Set Up Sheets
Where can I see some set up sheets. At our local club we started a new class, open mod, brushless, w/ lipo batteries. Most guys are using the tc4, while I am the sole pro4. However, I need some basic setup sheet info for asphalt track with OK traction. Check HPI website but they only seem to have pro 3 set-up sheets or for carpet! There has to be a place I can get set up sheets for asphalt w/ rubber tires...thanks...
Tech Master
Originally Posted by yyhayyim
Where can I see some set up sheets. At our local club we started a new class, open mod, brushless, w/ lipo batteries. Most guys are using the tc4, while I am the sole pro4. However, I need some basic setup sheet info for asphalt track with OK traction. Check HPI website but they only seem to have pro 3 set-up sheets or for carpet! There has to be a place I can get set up sheets for asphalt w/ rubber tires...thanks...
Tech Addict
iTrader: (12)
What does the HPI pink 6548 compare in lbs? Thanks
Tech Champion
iTrader: (9)
Originally Posted by raptor 700
What does the HPI pink 6548 compare in lbs? Thanks
Tech Champion
iTrader: (9)
now that Tamiya is set to release the new Evo-V
and Yok has the SD-LCG . both cars having low CG and aluminum bulkheads
Wonder if HPI is working on working a similar concept..presumably the Pro5?
and Yok has the SD-LCG . both cars having low CG and aluminum bulkheads
Wonder if HPI is working on working a similar concept..presumably the Pro5?