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Old 09-01-2009, 08:51 AM   #1126
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Default The "Pietsch MRX4-X Mods"

I have the radio tray strut mod and the rear shock mt. mod done to
my car. Tried it this week end at the Gulf Coast raceway in Houston.

You can see just a hint of additional torsional flex in the chassis, not
much, however how far are you really going to flex a 5 mm chassis?
The car seems to have just a little more side bite in the rear. The super quick rotation the X rear end usually has, is tempered just a bit without any
apparent adverse effect on steering. The rear end feels more planted.
I also added a center vertical strut like the one Salven used on his Serpent.
This strut can pivot so it does not affect the tortional flex however it
holds the back of the radio tray down. I could not tell from the world
pictures of Pietsch's car if he had this feature or not.

As far as the rear shock mod, no conclusion on how this fits in with the
radio tray mod, But it does not seem to hurt anything so I'm keeping it.

Dale
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Old 09-01-2009, 09:15 AM   #1127
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Quote:
Originally Posted by djmachinist View Post
I have the radio tray strut mod and the rear shock mt. mod done to
my car. Tried it this week end at the Gulf Coast raceway in Houston.

You can see just a hint of additional torsional flex in the chassis, not
much, however how far are you really going to flex a 5 mm chassis?
The car seems to have just a little more side bite in the rear. The super quick rotation the X rear end usually has, is tempered just a bit without any
apparent adverse effect on steering. The rear end feels more planted.
I also added a center vertical strut like the one Salven used on his Serpent.
This strut can pivot so it does not affect the tortional flex however it
holds the back of the radio tray down. I could not tell from the world
pictures of Pietsch's car if he had this feature or not.

As far as the rear shock mod, no conclusion on how this fits in with the
radio tray mod, But it does not seem to hurt anything so I'm keeping it.

Dale


Did you go faster with it at your home track?
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Old 09-01-2009, 10:07 AM   #1128
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Quote:
Originally Posted by brc358 View Post
I dont recall the Kyosho part number, but just order the rear floating body mount and it will come in that package. You will get some other items that wont be needed. Be sure and get the parts for the Evolva M3, and not the older style Evolva.You will also need four small spacer washers, and also a Dremel. Use the shorter of the two mounts.
Thanks your really helpful. Anything to make this ride btter is a +
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Old 09-01-2009, 10:20 AM   #1129
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Quote:
Originally Posted by Francis M. View Post
Did you go faster with it at your home track?

The Short answer is YES, I went about 1/2 second a lap faster than before.
However, let me explain a few facts: I am not one the fast guys in the Texas
area. I was.....about 25 years ago. I quit racing rc six years ago because of heath reasons and the fact my skills had dropped off. I felt I could not drive
at a respectable level any longer. After two years of losing weight and exercise, I felt well enough to start riding motorcycles. This developed into
having fun on sport bikes in the twisties and regaining some old skills and speed. For some reason the RC car cupid shot me with an arrow about three
months ago. I jumped back in the rc car game with some help from some old
friends. I updated to an MRX4-X and other needed equipment. My first race
was at the end May at the Dallas SWS series race. I found I did have some reflexes left and placed 3rd in the B main.

I found the X rear end set up rotated way to fast for my skill level at the
Dallas race. I switched to the R rear end found the car easier to drive at the
skill level I was at. I returned home to Houston and The local track just finished a total repaving revised layout. The track is fantastic with Tennis
court grade asphalt, with a very smooth surface and good traction without
any surface prep required. What this meens is I can go practise at any time
I want. So I have been doing just that, Practising a lot. My skill level is improving every week. I went to the "Pietsch mods" at the same time I converted back to the X rear end. My skill level had to improve to be able
to drive a more aggressive car. Two weeks ago at the SWS race at my home
track I placed fifth overall with some help from a couple of guys that broke
and did not finish the race. I'm still about a 1/4 second a lap off the pace of
the Fast guys, but I am improving.
I think the "Pietsch Mods" took enough edge off the X rear end to allow me to
be able to transition to a more aggressive set-up.

sorry about the long commentary.

Dale
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Old 09-01-2009, 10:48 AM   #1130
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Cool

You sound just like me I had to put the R rear also to get the car to handle the way I drive soon I will put the X rear back on. But not to many tracks out here in the Bronx so I go to Brooklyn NY floyd bennett. Out there are to many bashers not many racers.
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Old 09-01-2009, 02:26 PM   #1131
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@brc358:

Quote:
This change, and also the change to the P909 body is working great.


What have you changed on the 909?

Thanks, Stefan
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Old 09-01-2009, 02:50 PM   #1132
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Originally Posted by fulcrum2 View Post
@brc358:





What have you changed on the 909?

Thanks, Stefan
Posted on previous page> Chnaged out the rear body mounts to the Evolva M3 mounts>
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Old 09-01-2009, 07:27 PM   #1133
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Quote:
Originally Posted by brc358 View Post
Posted on previous page> Chnaged out the rear body mounts to the Evolva M3 mounts>
So you changed the body mount and the LIL swing arms that go connected to the uprights is that all.
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Old 09-01-2009, 07:43 PM   #1134
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Originally Posted by mugenize1 View Post
So you changed the body mount and the LIL swing arms that go connected to the uprights is that all.
Thats all really. I am using the set up that Mike posted for Crystal Park.
I was using the Central body, and it does great on the Mugen.
When the R12 came out, I tried those, and the car pushed.
I then tried the Zytek, and it seemed to twitchy for me, so I now use either the P909, or the Central. When you raise the rear of the body and use the
P909 body, the car feels very stable.
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Old 09-02-2009, 12:55 PM   #1135
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Part# FM602 Rear Hub (EVOLVA M3)



Quote:
Originally Posted by brc358 View Post
Posted on previous page> Chnaged out the rear body mounts to the Evolva M3 mounts>
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Old 09-02-2009, 02:59 PM   #1136
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Quote:
Originally Posted by mugenize1 View Post
So you changed the body mount and the LIL swing arms that go connected to the uprights is that all.


I only changed the swing arm to the M3 unit... The car has better turn in and at the same time more predictable with the rear of the body mounted higher in the rear....
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Old 09-02-2009, 05:31 PM   #1137
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Thanks Francis M.
I will try that setup, anything to make this Bad boy handle better.
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Old 09-02-2009, 05:42 PM   #1138
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Sorry I put the wrong pic up that's how the car was looking like Now it looks like this
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Old 09-03-2009, 12:14 PM   #1139
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Quote:
Originally Posted by Francis M. View Post
I only changed the swing arm to the M3 unit... The car has better turn in and at the same time more predictable with the rear of the body mounted higher in the rear....
I just ordered the m3 rear body mount and the swing arms. I would like to see what your car looks like with the m3 parts on it.
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Old 09-03-2009, 08:11 PM   #1140
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Quote:
Originally Posted by mugenize1 View Post
I just ordered the m3 rear body mount and the swing arms. I would like to see what your car looks like with the m3 parts on it.
Just the swing arm. It should come with a pair of rear wheel hubs ( Kyosho M3). Use the original MRX4X body mount. Just cut about 1 mil on each end of H arms to fit in Mugen body mount.
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