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Old 08-08-2017, 08:24 AM   #16051
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Old 08-08-2017, 12:00 PM   #16052
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So I did a bit more searching and it seems most of the Pro4 revivals other than TC racers are the drifters who have been fitting CS gears into the diff cases. In several places online I've seen the Yokomo 2.0x Counter-steer solid axle/spool set D-051 or D-089 (for 1.8x) being installed in the rear of the Pro4 with a modified input shaft to use the corresponding pinion gear.

The above got me thinking whether the SD gear diff I mentioned earlier would fit, as it's from the same chassis which the CS gears are designed for.

Now of course even then there might be the issue of the ring gear position to get the right gear mesh.

HPI Pro4 CS - CSJunkies

https://blogs.yahoo.co.jp/tonchang07...0771.html?m=lc







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Old 08-08-2017, 03:05 PM   #16053
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OK guys, here's the dimensions. 29 width and circa 20mm of maximum diff case OD. Not much else needed right?
Attached Thumbnails
Hpi Pro 4-sem-t%EDtulo.jpg  
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Old 10-11-2017, 03:23 AM   #16054
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Default Better O-Rings. . . . . . .?

What O-Rings are better?

HPI
-item # 6820 P-3 (Clear) (I currently use)

Hot Bodies
-item # 114673 #30 P-3(Yellow)
-item # 114674 #40 P-3(Orange)
-item # 114675 #50 P-3(Green)

What makes them different; besides the color?
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Old 11-28-2017, 08:32 AM   #16055
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I have a pro 4. Seems all the screws strip when I go to take them out. Allen key is fine. Pb blast? Wd40? Also what is the final decision on what fits the diff cases? I put brushless in to be ridiculous, and obviously cooked the ball diff.
PS.. wouldn't let me put pic in yet
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Old 11-28-2017, 04:41 PM   #16056
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Quote:
Originally Posted by Pro4ever View Post
I have a pro 4. Seems all the screws strip when I go to take them out. Allen key is fine. Pb blast? Wd40? Also what is the final decision on what fits the diff cases? I put brushless in to be ridiculous, and obviously cooked the ball diff.
PS.. wouldn't let me put pic in yet
It should be ok with 17.5 motors or less. Use a fresh diff bolt and nut. Check on the diff after you rebuild it and run it a few times. It will loosen up on you after it breaks in. Then just tighten it up a tad.

Here's the nut and bolt.

https://www.ebay.com/p/HPI-Different...ro-4/672309332
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Old 11-28-2017, 09:53 PM   #16057
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Quote:
Originally Posted by Pro4ever View Post
I have a pro 4. Seems all the screws strip when I go to take them out. Allen key is fine. Pb blast? Wd40? Also what is the final decision on what fits the diff cases? I put brushless in to be ridiculous, and obviously cooked the ball diff.
PS.. wouldn't let me put pic in yet
Hey Bud
I have the Exotek Pro4 conversion and I really love it and it is one of my fastest breast shaft drive that is for sure...
Email Mike ,which he own the Exotek Racing CO. this guy is very knowledge ...
good luck
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Old 11-29-2017, 03:40 AM   #16058
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Would love to get my hands on an exotek conversation
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Old 11-30-2017, 03:25 AM   #16059
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Default HPI Pro4 Exotek-Full-Conversion-Set

Hi HPI Pro4 family
Just want to show you my HPI Pro4-Exotek. Build only, never used (is my spare car). Wanted to have best quality parts to ensure I have the best up to date Pro4 possible to compete with todays Xray’s and Yokomo‘s. So no corner was untouched:

Exotek Pro4X V2 Conversion-Set
Exotek Floating Servo Mount
Special HPI CF-Shaft, light weight and very durable
Exotek Pro4X Spool and Diff (best ball diff ever!)
Exotek Pro4X parts to secure the lipo
Hiro Seiko Screw kit
Etc.

Car is just amazing! In 13.5t Stock my friend had no problems at all to hold up with the speed of the Xray and Yokomo guys! The car has so much corner speed and good traction and you can feel the advantage of a shaft driven car in and out of the corners. Also, the car is very easy to setup. HPI should just bring the Pro4 again with small updates and they would have a winner again!

If someone of you is seriously interested in the car, I am willing to sell it. But there will be shipment costs, as I am located in Europe. ;-) Just let me know.


Hpi Pro 4-bild1.jpg

Hpi Pro 4-bild2.jpg

Hpi Pro 4-bild3.jpg

Hpi Pro 4-bild4.jpg
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Old 11-30-2017, 03:39 AM   #16060
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Default HPI Pro 4 Exotek Full Converstion Set

...some more photos of my Pro 4 Exotek including HB 67699 DCJ Drive Shaft Set

Hpi Pro 4-bild5.jpg

Hpi Pro 4-bild6.jpg

Hpi Pro 4-bild7.jpg

Hpi Pro 4-bild8.jpg
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Old 12-09-2017, 02:19 AM   #16061
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Does anyone know if the stock MIP Axles show wear on the joint-area after around 60-runs?

Thank You
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Old 12-12-2017, 08:33 AM   #16062
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So exotek is where I find the diff.... K. Recently cleaned it up and found I need a new steering saver. Thanks for the help guys. Recently been looking at the Sakura d4 alloy and carbon on eBay... Any thoughts? People say clone but isn't it just a full option?
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Old 12-12-2017, 08:37 AM   #16063
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And of course it's out of stock. I'm sad. I miss my pro 4 quality time.
Quote:
Originally Posted by Pro4ever View Post
So exotek is where I find the diff.... K. Recently cleaned it up and found I need a new steering saver. Thanks for the help guys. Recently been looking at the Sakura d4 alloy and carbon on eBay... Any thoughts? People say clone but isn't it just a full option?
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Old 12-12-2017, 09:17 AM   #16064
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That is a beautiful car
Quote:
Originally Posted by wildGT View Post
Hi HPI Pro4 family
Just want to show you my HPI Pro4-Exotek. Build only, never used (is my spare car). Wanted to have best quality parts to ensure I have the best up to date Pro4 possible to compete with todays Xray’s and Yokomo‘s. So no corner was untouched:

Exotek Pro4X V2 Conversion-Set
Exotek Floating Servo Mount
Special HPI CF-Shaft, light weight and very durable
Exotek Pro4X Spool and Diff (best ball diff ever!)
Exotek Pro4X parts to secure the lipo
Hiro Seiko Screw kit
Etc.

Car is just amazing! In 13.5t Stock my friend had no problems at all to hold up with the speed of the Xray and Yokomo guys! The car has so much corner speed and good traction and you can feel the advantage of a shaft driven car in and out of the corners. Also, the car is very easy to setup. HPI should just bring the Pro4 again with small updates and they would have a winner again!

If someone of you is seriously interested in the car, I am willing to sell it. But there will be shipment costs, as I am located in Europe. ;-) Just let me know.


Attachment 1451954

Attachment 1451955

Attachment 1451956

Attachment 1451957
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Old 12-12-2017, 12:09 PM   #16065
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Quote:
Originally Posted by Pro4ever View Post
So exotek is where I find the diff.... K. Recently cleaned it up and found I need a new steering saver. Thanks for the help guys. Recently been looking at the Sakura d4 alloy and carbon on eBay... Any thoughts? People say clone but isn't it just a full option?
Hey Bud
check this on Ebay
NEW LISTING HPI Part #73508 Steering Parts Set for the Pro 4
Brand New
$7.00
Buy It Now
+$3.00 shipping
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