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Hpi Pro 4


Old 03-20-2006, 03:56 PM
  #14086  
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Originally Posted by cars.cars.cars
so i need both front and rear diffs???
not really...depends on what you're racing on, track condition etc.

the rear will always have a diff..

the Hara Edition if perfect for outdoor asphalt racing..comes with both front one-way and front spool.
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Old 03-20-2006, 04:13 PM
  #14087  
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ok...im not to good with the tecnical stuff. so i can leave it the way it is???

I am also looking at doing a little bit of drifting with this. so will i have to change everything?
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Old 03-20-2006, 05:06 PM
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ok. im new to the whole electric thing and am wondering what radio/other stuff do i need to get other than motor and speed control (i have a futuba 3pk radio). How many servos do i need, do i need a receiver or does the speed control do that... and how do i know if the speed control is compatable with the motor?


And what tires should i go with (foam, slicks or rubbers)
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Old 03-20-2006, 05:27 PM
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Heres my stock carpet / foam tire set-up from yesterday. The car had smooth, but slightly aggressive steering and good rotation while transitioning very well and remaining stable. The track was small and technical w/ medium traction. Give it a try:

Chassis / Center post: Hpi 3mm lower & 2.5mm upper w/ tweak mod. / yes.

Front:
Diff setting / Type: medium-tight / delrin.
Shock oil: 70wt. Trinity.
Shock piston: #3.
Shock bladder: Firm (stock).
Springs: Xray Purple - 33 lbs.
Shock position on tower: #2 hole.
Shock position on arm: outer hole.
Front suspension mount: 3 deg. toe block / 1mm spacer.
Rear suspension mount: no spacer.
Camber mount location: #3 position on optional graphite camber plate. No spacers under inner or outer ball studs.
Camber: -2 deg.
Caster block: 4
Ackerman: #1 hole on steering plate / #1 hole on steering knuckle.
Sway Bar: 1.2mm / aluminum ball mount flush.
Toe: out -1 deg.
Width: 190mm
Droop: 4mm
Ride height: 4mm
Tire Type / Diameter: Jaco - Orange/Purple (plaid) / 55mm (use traction compound on inner-half of tires).
Traction compound: Paragon.

Rear:
Diff / Type: Medium / Delrin
Shock oil: 70wt. Trinity.
Shock piston: #3.
Shock Bladder: Firm (stock).
Springs: Xray L. Red - 35 lbs.
Shock position on Tower: #4 hole.
Shock position on arm: #2 hole (middle).
Front suspension mount: no spacer.
Rear suspension mount: 1 degree toe block / no spacer.
Camber mount locations: inner on optional camber plate - #2 position / outer (hub) #1 position w/ 2mm spacer under ball stud.
Camber: -2
Sway Bar: 1.6mm / aluminum ball mount back 4mm.
Droop: 4mm
Wheelbase: short
Width: 190mm
Ride Height: 4.5mm
Tire type / Diameter: JACO - Purple / 55mm. (traction compound full tire.)
Traction compound: Paragon.
Gearing: Spur 98T 64p / Pinion 31T 64p
Final Drive Ratio: 7.70

Body: Protoform G6
Motor: Axxis Racing - Vitec (Monster Based)
Batteries: Axxis Racing - Voltaxx HES IB3800
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Old 03-20-2006, 05:32 PM
  #14090  
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Originally Posted by kewdawg
Heres my stock carpet / foam tire set-up from yesterday. The car had smooth, but slightly aggressive steering and good rotation while transitioning very well and remaining stable. The track was small and technical w/ medium traction. Give it a try:

Chassis / Center post: Hpi 3mm lower & 2.5mm upper w/ tweak mod. / yes.

Front:
Diff setting / Type: medium-tight / delrin.
Shock oil: 70wt. Trinity.
Shock piston: #3.
Shock bladder: Firm (stock).
Springs: Xray Purple - 33 lbs.
Shock position on tower: #2 hole.
Shock position on arm: outer hole.
Front suspension mount: 3 deg. toe block / 1mm spacer.
Rear suspension mount: no spacer.
Camber mount location: #3 position on optional graphite camber plate. No spacers under inner or outer ball studs.
Camber: -2 deg.
Caster block: 4
Ackerman: #1 hole on steering plate / #1 hole on steering knuckle.
Sway Bar: 1.2mm / aluminum ball mount flush.
Toe: out -1 deg.
Width: 190mm
Droop: 4mm
Ride height: 4mm
Tire Type / Diameter: Jaco - Orange/Purple (plaid) / 55mm (use traction compound on inner-half of tires).
Traction compound: Paragon.

Rear:
Diff / Type: Medium / Delrin
Shock oil: 70wt. Trinity.
Shock piston: #3.
Shock Bladder: Firm (stock).
Springs: Xray L. Red - 35 lbs.
Shock position on Tower: #4 hole.
Shock position on arm: #2 hole (middle).
Front suspension mount: no spacer.
Rear suspension mount: 1 degree toe block / no spacer.
Camber mount locations: inner on optional camber plate - #2 position / outer (hub) #1 position w/ 2mm spacer under ball stud.
Camber: -2
Sway Bar: 1.6mm / aluminum ball mount back 4mm.
Droop: 4mm
Wheelbase: short
Width: 190mm
Ride Height: 4.5mm
Tire type / Diameter: JACO - Purple / 55mm. (traction compound full tire.)
Traction compound: Paragon.
Gearing: Spur 98T 64p / Pinion 31T 64p
Final Drive Ratio: 7.70

Body: Protoform G6
Motor: Axxis Racing - Vitec (Monster Based)
Batteries: Axxis Racing - Voltaxx HES IB3800

What's the "Tweek Mod"?
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Old 03-20-2006, 06:05 PM
  #14091  
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http://www2.towerhobbies.com/cgi-bin...?&I=LXGNY0&P=0
Is that the one that i want??? or is it the rear one i want?

and when i get the car i will be shure to try those settings out..but i got lost in there.
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Old 03-20-2006, 06:06 PM
  #14092  
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Originally Posted by WisRacr1
What's the "Tweek Mod"?
It's been discussed at length here, but the posts are buried now and I can't find them either, so here are the best images I have of it. The part of the mod you can't see is that there are shock-seal type o-rings under the inverted purple cone washers bolted to the steering posts, and the holes that are enlarged are done so in the back and the front of the upper deck. This helps the upper deck "flex" and settle back into place without setting into a "tweaked" position.

Hope that helps!
Attached Thumbnails Hpi Pro 4-o-ring-pro-4-mod.jpg   Hpi Pro 4-upper-deck-mod2.jpg  
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Old 03-20-2006, 07:13 PM
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Thanks, Cartmen34. I was dreading the thought of trying to find it, again.
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Old 03-20-2006, 07:32 PM
  #14094  
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Originally Posted by cars.cars.cars
http://www2.towerhobbies.com/cgi-bin...?&I=LXGNY0&P=0
Is that the one that i want??? or is it the rear one i want?

and when i get the car i will be shure to try those settings out..but i got lost in there.
No, you want the BALL differential. here ya' go: Pro 4 Ball Differential
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Old 03-20-2006, 07:50 PM
  #14095  
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Originally Posted by cartmen34
It's been discussed at length here, but the posts are buried now and I can't find them either, so here are the best images I have of it. The part of the mod you can't see is that there are shock-seal type o-rings under the inverted purple cone washers bolted to the steering posts, and the holes that are enlarged are done so in the back and the front of the upper deck. This helps the upper deck "flex" and settle back into place without setting into a "tweaked" position.

Hope that helps!
Note, this is now standard on the Hara edition, so take a look at the instructions for that kit for some detailed views and directions on how much to tighten things.

Ira
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Old 03-20-2006, 08:48 PM
  #14096  
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Originally Posted by kewdawg
One-ways are used in Asia, not diffs. Many tracks there are "fast" (big sweeping, flowing turns) and are better suited for one-ways or spools.
That's a misnomer. One-ways are awesome on tight small ASPHALT tracks (9 sec laps is small) as well as big tracks. A diff will send you to the b-main here on the sunny tracks. BUT since cars.cars is new to the game he really should start with the front ball diff. Him being in PA I'm sure all the tracks are carpet any way
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Old 03-20-2006, 09:06 PM
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Originally Posted by MikeR
That's a misnomer. One-ways are awesome on tight small ASPHALT tracks (9 sec laps is small) as well as big tracks. A diff will send you to the b-main here on the sunny tracks. BUT since cars.cars is new to the game he really should start with the front ball diff. Him being in PA I'm sure all the tracks are carpet any way
On carpet w/ foams, the One-way is driveable but will exhibit heavy oversteer and be inconsistent. Also, on tight, small tracks you'll have to let off the throttle way too much. Definitely not the way to go. You think 9 seconds is small... try 5 seconds!!!
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Old 03-20-2006, 09:46 PM
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Originally Posted by kewdawg
On carpet w/ foams, the One-way is driveable but will exhibit heavy oversteer and be inconsistent. Also, on tight, small tracks you'll have to let off the throttle way too much.
That's why I specifically mentioned asphalt. Your earlier statement reffered to all of the USA

Originally Posted by kewdawg
try 5 seconds!!!
Woah haha That's about 3 turns and 1 straight I've raced on a track like that before... with double one-ways...and tq'd and won
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Old 03-21-2006, 04:45 AM
  #14099  
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Originally Posted by MikeR
That's why I specifically mentioned asphalt. Your earlier statement reffered to all of the USA
On asphalt the car will still oversteer. You said it was awesome. I say - not even close. You'll have a lot more control and better handling, with a diff, on ANY small & tight track.
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Old 03-21-2006, 04:53 AM
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Originally Posted by MikeR
That's about 3 turns and 1 straight I've raced on a track like that before... with double one-ways...and tq'd and won
Nah.. its, actually, about 7 turns but it's a fast layout!
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