JRX-2 cheater + JRX Pro
- K Rob
- Approved Member
- Posts: 36
- Joined: Mon Aug 08, 2016 11:00 am
- Location: Birmingham, UK
- Been thanked: 4 times
JRX-2 cheater + JRX Pro
Having had a JRX-2 back in the day and having a few other vintage cars I decided to get one. Was a bit of a mess but tidied up okay.
I then decided I wanted to drive it but I have nightmares thinking back to the problems I had with the original gearbox (seemed to be forever eating diff thrust races).
So thought I would experiment a bit and found a XX retro fit box which I knew would be reliable, unfortunately it's not a straight fit due to the diff sitting so low. Didn't want to cut the JRX chassis so just made a up a 2mm plate to raise everything else up.
Worked a treat and had the added bonus of making the battery slot on the bulkhead higher to take Lipos.
And it's now a racer
Still suffers power on understeer but added plenty of weight up front and gone to shorty which helps. Cracking fun
Had to fit a rather ugly bulkhead brace as I bust the original and they're not cheap
Also got a JRX Pro sitting on the shelf with hydra drive (yes I know this came along later but it just looks so good!!)
I then decided I wanted to drive it but I have nightmares thinking back to the problems I had with the original gearbox (seemed to be forever eating diff thrust races).
So thought I would experiment a bit and found a XX retro fit box which I knew would be reliable, unfortunately it's not a straight fit due to the diff sitting so low. Didn't want to cut the JRX chassis so just made a up a 2mm plate to raise everything else up.
Worked a treat and had the added bonus of making the battery slot on the bulkhead higher to take Lipos.
And it's now a racer
Still suffers power on understeer but added plenty of weight up front and gone to shorty which helps. Cracking fun
Had to fit a rather ugly bulkhead brace as I bust the original and they're not cheap
Also got a JRX Pro sitting on the shelf with hydra drive (yes I know this came along later but it just looks so good!!)
CML Distribution - FTX - Etronix - Fastrax - Centro
RC Racer Magazine
RC Racer Magazine
- matt1ptkn
- Approved Member
- Posts: 910
- Joined: Wed Dec 12, 2012 8:27 am
- Location: Moundsville, WV
- Has thanked: 80 times
- Been thanked: 132 times
Re: JRX-2 cheater + JRX Pro
I always thought that the retro fit XX transmission was a direct bolt on fit. That is not the case? What didn't fit?
P.S. Buggies look great!
P.S. Buggies look great!
Matt
Just a part of my RC collection: Matt1ptkn's Toys
"I wish there was a way to tell you're in the good old days, before you've actually left them."
Just a part of my RC collection: Matt1ptkn's Toys
"I wish there was a way to tell you're in the good old days, before you've actually left them."
- LosiXXkid
- Approved Member
- Posts: 757
- Joined: Sun Mar 03, 2013 5:35 pm
- Location: Islington, North London
- Has thanked: 2 times
- Been thanked: 6 times
Re: JRX-2 cheater + JRX Pro
It is a direct fit on the molded chassis such as the Jr.2 but not on the the JRX2's flat graphite chassis. Here's the recess in the transmission section of the molded chassis.....matt1ptkn wrote:I always thought that the retro fit XX transmission was a direct bolt on fit. That is not the case? What didn't fit?
P.S. Buggies look great!
~I'm a lot older now than I was then and wish that I knew then what I know now~
- matt1ptkn
- Approved Member
- Posts: 910
- Joined: Wed Dec 12, 2012 8:27 am
- Location: Moundsville, WV
- Has thanked: 80 times
- Been thanked: 132 times
Re: JRX-2 cheater + JRX Pro
Gotcha. I didn't remember that the molded chassis had the recess under the transmission. Its not often that I remove a bullet proof LRM from its chassis.
Matt
Just a part of my RC collection: Matt1ptkn's Toys
"I wish there was a way to tell you're in the good old days, before you've actually left them."
Just a part of my RC collection: Matt1ptkn's Toys
"I wish there was a way to tell you're in the good old days, before you've actually left them."
- LosiXXkid
- Approved Member
- Posts: 757
- Joined: Sun Mar 03, 2013 5:35 pm
- Location: Islington, North London
- Has thanked: 2 times
- Been thanked: 6 times
Re: JRX-2 cheater + JRX Pro
Just in case you haven't seen this thread....K Rob wrote:Having had a JRX-2 back in the day and having a few other vintage cars I decided to get one. Was a bit of a mess but tidied up okay.
I then decided I wanted to drive it but I have nightmares thinking back to the problems I had with the original gearbox (seemed to be forever eating diff thrust races).
So thought I would experiment a bit and found a XX retro fit box which I knew would be reliable, unfortunately it's not a straight fit due to the diff sitting so low. Didn't want to cut the JRX chassis so just made a up a 2mm plate to raise everything else up.
Worked a treat and had the added bonus of making the battery slot on the bulkhead higher to take Lipos.
And it's now a racer
Still suffers power on understeer but added plenty of weight up front and gone to shorty which helps. Cracking fun
Had to fit a rather ugly bulkhead brace as I bust the original and they're not cheap
Also got a JRX Pro sitting on the shelf with hydra drive (yes I know this came along later but it just looks so good!!)
http://www.rc10talk.com/viewtopic.php?f=27&t=24503
~I'm a lot older now than I was then and wish that I knew then what I know now~
- K Rob
- Approved Member
- Posts: 36
- Joined: Mon Aug 08, 2016 11:00 am
- Location: Birmingham, UK
- Been thanked: 4 times
Re: JRX-2 cheater + JRX Pro
I hadn't seen that one - cheers. Will have a read.
Raced against DerbyDan at the recent Iconic RC Revival - but neither of us were using JRX-2's.
Raced against DerbyDan at the recent Iconic RC Revival - but neither of us were using JRX-2's.
CML Distribution - FTX - Etronix - Fastrax - Centro
RC Racer Magazine
RC Racer Magazine
- RCveteran
- Approved Member
- Posts: 1362
- Joined: Sat Jul 10, 2010 6:48 pm
- Has thanked: 4 times
- Been thanked: 99 times
Re: JRX-2 cheater + JRX Pro
I run a shorty Lipo pack in my racer JRXT pushed way forward to middle almost up to steering servo, helps keep car much more neutral and counter the understeer you are finding. I am hardly a top driver but it is the most balanced JRX I've come up with yet.
http://www.rc10talk.com/viewtopic.php?f=27&t=40033
http://www.rc10talk.com/viewtopic.php?f=27&t=40033
- K Rob
- Approved Member
- Posts: 36
- Joined: Mon Aug 08, 2016 11:00 am
- Location: Birmingham, UK
- Been thanked: 4 times
Re: JRX-2 cheater + JRX Pro
Looks awesome! Interesting you've looked at moving the cells around. Mine was definitely better with the shorty forward compared to a standard length pack.
A friend has just made an alloy chassis for his JRX2 and has offered to make one with a cut out for the gearbox - I'm seriously considering it! Could also get more kick up at the front to bring it in line with the Pro chassis.
A friend has just made an alloy chassis for his JRX2 and has offered to make one with a cut out for the gearbox - I'm seriously considering it! Could also get more kick up at the front to bring it in line with the Pro chassis.
CML Distribution - FTX - Etronix - Fastrax - Centro
RC Racer Magazine
RC Racer Magazine
- DerbyDan
- Approved Member
- Posts: 1836
- Joined: Tue Sep 08, 2009 8:04 am
- Location: Northampton UK
- Has thanked: 2 times
- Been thanked: 17 times
Re: JRX-2 cheater + JRX Pro
Hi Kieth - I thought I recognised your pink & blue paint scheme!K Rob wrote:I hadn't seen that one - cheers. Will have a read.
Raced against DerbyDan at the recent Iconic RC Revival - but neither of us were using JRX-2's.
Your JRX2 looks great.... I'm sure you'll enjoy running the 5-link car.... I think mine is my favourite of all the vintage buggies that I have run so far, they seem so easy & dependable to drive + I love the way the original car looks It's quite apt that you now have a JRX2 since (as I'm sure you know) CML were the original UK distributers back when they were first released.
Your fitment of a XX retrofit gearbox is probably a wise move as it pretty much future-proofs your car, since the XX box will certainly handle any wind motor you decide to throw at it. My LRM gearboxed car is upgraded with the Thorpe nylon layshaft & alloy diff gears - along with a twin plate slipper (XXKW/XXX) which I think 'should' now prove more durable (I did a year's worth of racing with just the slipper on std gears before the diff gear gave up). But it's always in the back of my mind that at some point one of the other gears will eventually strip. The hottest motor I've so far run in the car is an 8.5bl (Orion Vortex).
PS; what meetings are you likely to do with the 'new' JRX2?
My T.C Showroom; http://www.tamiyaclub.com/member.asp?id=28990
- DerbyDan
- Approved Member
- Posts: 1836
- Joined: Tue Sep 08, 2009 8:04 am
- Location: Northampton UK
- Has thanked: 2 times
- Been thanked: 17 times
Re: JRX-2 cheater + JRX Pro
The diff gear that I stripped was one with the centre bearing - the rest of the gearbox was standard LRM (aside from the slipper assembly & top shaft). The gear finally went after a whole year of regular running with an 8.5bl motor (I don't know what motors you are using) & on mostly high grip tracks.... I was actually surprised that it lasted that long since I knew the diff gear was a known weak part - I even received at one point a box of old JRX2 parts from a friend, which included a whole bunch of pre-stripped diff gears, all left over from the brushed motor days.RCveteran wrote:Derby, are you running the dual ball bearing LRM Differential? I've never had one give up yet?
I've only done the one meeting with the JRX2 with the replacement Thorpe upgrade diff & layshaft gears (the 1st Revival meeting in 2014, where it won the 2wd race of champions race) so perhaps not a true test of long-term durability?
My T.C Showroom; http://www.tamiyaclub.com/member.asp?id=28990
- RCveteran
- Approved Member
- Posts: 1362
- Joined: Sat Jul 10, 2010 6:48 pm
- Has thanked: 4 times
- Been thanked: 99 times
Re: JRX-2 cheater + JRX Pro
That explains it, mine never see lower than 13.5bl motor. When I get to the track the one I go to is too small for more. And I can barely drive a 13.5 as it is.
Create an account or sign in to join the discussion
You need to be a member in order to post a reply
Create an account
Not a member? register to join our community
Members can start their own topics & subscribe to topics
It’s free and only takes a minute
Sign in
-
- Similar Topics
- Replies
- Views
- Last post
-
- 4 Replies
- 750 Views
-
Last post by cas22
-
- 9 Replies
- 1095 Views
-
Last post by Bongo Fury
-
- 8 Replies
- 1059 Views
-
Last post by Momo5
-
- 1 Replies
- 1629 Views
-
Last post by Endtimes
-
- 6 Replies
- 945 Views
-
Last post by mrlexan
-
- 8 Replies
- 1207 Views
-
Last post by bearrickster
-
- 2 Replies
- 1185 Views
-
Last post by crazy nick
-
- 11 Replies
- 2021 Views
-
Last post by kaiser
Who is online
Users browsing this forum: Amazon [Bot] and 13 guests