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View Full Version : Install: Mr-03 Double A-Arm


bcpzx3
2012.05.02, 02:02 PM
Great product from PN racing. Here is a picture of before and after of the installation.

After installation i noticed the knuckles had slight play, so i removed the E-clip that holds the knuckles to the A-Arms and added 2 shims on top of the shaft and put the E-clip back on. This does not change the height of the setup but it does eliminate the excess play.

I also replaced the springs that came with the kit, with slightly softer springs so I can get some suspension travel out of the setup.

Previous setup:
This setup did the fastest Stock GT time at the local track (Phea driving), but wasn't consistent.
http://i22.photobucket.com/albums/b313/teamnamiek/b8e25c8f.jpg

Before taking the car apart and cutting
http://i22.photobucket.com/albums/b313/teamnamiek/384f308e.jpg

Pn instructions tells you to cut this part off. There is also a little tab that you will need to trim flat, the lower A-arm will hit that part.
http://i22.photobucket.com/albums/b313/teamnamiek/30ebdccf.jpg

Here is where I added the shims
http://i22.photobucket.com/albums/b313/teamnamiek/27ad0965.jpg

Bottom side of the Double A-Arm setup
http://i22.photobucket.com/albums/b313/teamnamiek/Untitled-3.jpg

I have yet to try this setup on the track. But will return with results after testing. This kit was just thrown together for test fitting, I will also disassemble and add some lube/grease and certain joints for less wear and tear for the long run.

So far with this kit,
-I notice how there is less slop on the knuckles compared to the stock setup. If you grab the top and bottom on the wheel and wiggle, it will not move much.

-Suspension travel is extremely smooth, not sure how it will hold up on the long run since everything is metal on metal, but time will tell.

-All parts are extremely light, I should have done a before and after weight comparison. I can always just weigh the two front ends (stock vs. PN double a-arm) on a scale and compare.

-Tony

machgo5go
2012.05.02, 09:25 PM
3 out of my 4 MR03 has it so can't be wrong!
You gonna love it in the handling potentials.

lfisminiz
2012.05.02, 09:33 PM
3 out of my 4 MR03 has it so can't be wrong!
You gonna love it in the handling potentials.

Totally agree!;):)

briankstan
2012.05.03, 11:06 AM
I've switched my 03, as well as 2 of the other guys that race with me. I'm under the impression that this is the best front end I've ever had on my 03, in fact after driving my car that is what prompted the 2 to upgrade from the MR02 to the MR03.

The PN MR-03 A-Arm front end Rocks. :D

bcpzx3
2012.05.03, 01:55 PM
Does anyone notice faster lap times compared to the old setup?
Taking in consideration that this is the only change you did to your car?
Or are times same but just more consistent laps?

color01
2012.05.04, 02:40 AM
After switching to the 1 degree camber lower arms, I think the double A-arm makes the car feel smoother off-power and generates more on-power steering. This is probably not necessary for Stock classes, but it definitely helps in Mod IMO. Without the 1 degree arms I thought the setup was junk, but I'm definitely a convert now -- I was able to match Grant and Stephen's 10.1xx fast laps at RCX and I am nowhere close to being as good (or practiced) of a driver as those two.

I would caution you that you should get a new stock top cover for the chassis -- the geometry of the double A-arm is extremely important to get good performance out of it and the top cover is needed to space the tower bar upwards the correct distance. Good luck with the front end!

briankstan
2012.05.04, 06:52 AM
my lap times have come down, and my consistency has improved as well. I know that our other guys have noticed the same with theirs as well.

Bodom
2012.05.04, 08:19 AM
@bcpzx3:
Just curious - would you share the rear setup of your chassis as well?

cowboysir
2012.05.04, 11:34 PM
Here is where I added the shims
http://i22.photobucket.com/albums/b313/teamnamiek/27ad0965.jpg


In the process of getting the front end a bit less slop i found out that the little blue washer that comes in the PN front axle kit makes a perfect sized shim for the top of the arm below the c-clip. Instead of fumbling with 2 shims and clip install (if you have it) the one blue shim. i found a nicer tolerance with less knuckle wobble on the through shaft.

bcpzx3
2012.05.05, 01:17 PM
@bcpzx3:
Just curious - would you share the rear setup of your chassis as well?

94mm PN rear motor mount
Medium Kyosho T-plate
Reflex racing top damper disc
Red Springs (not sure what brand)
Kyosho ball diff
+3 offset Rear wheel
Pn Radial 6 tires


In the process of getting the front end a bit less slop i found out that the little blue washer that comes in the PN front axle kit makes a perfect sized shim for the top of the arm below the c-clip. Instead of fumbling with 2 shims and clip install (if you have it) the one blue shim. i found a nicer tolerance with less knuckle wobble on the through shaft.

Thanks for sharing that bit of tip. I do actually have the PN front axle kit that you mentioned. Yeah trying to keep 2 shims on and working the C-clip is quite a hassle.

bcpzx3
2012.05.05, 01:19 PM
I would caution you that you should get a new stock top cover for the chassis -- the geometry of the double A-arm is extremely important to get good performance out of it and the top cover is needed to space the tower bar upwards the correct distance. Good luck with the front end!

Can't imagine the difference with using the stock cover, But i will pull it out and compare. Thanks for the tip Brian.

my lap times have come down, and my consistency has improved as well. I know that our other guys have noticed the same with theirs as well.

Glad to hear some solid feedback with this item.

bcpzx3
2012.05.09, 03:01 AM
Thanks Brian for the heads up. I put back the stock top cover and see what you were talking about.

Updates:
- need to put some loctite on the spring screws.
- change springs to softer springs (the one that comes with it is extremely hard)
- put in 0.5 toe bar
- set camber to max

Car drives great and is very smooth around turns. I'm quite happy with the results from the upgrade. Only thing I would suggest is that PN should include the washers needed to tighten up the play on the knuckle between the A-arms. I noticed everyone else who runs this setup also has the washers on there.

mitchy2759
2012.06.01, 02:16 AM
bcpzx3, can i ask what do you use to cut the part in the second pict?
i am in the middle of taking the car apart process. thx

machgo5go
2012.06.01, 05:58 AM
bcpzx3, can i ask what do you use to cut the part in the second pict?
i am in the middle of taking the car apart process. thx
Small wire cutter to cut off access and then use a dremel to grin down the rest to be flat & smooth.

mitchy2759
2012.07.27, 12:58 AM
Hi, guys. i need help here.
i am trying to install the c clip at the lower part of the arm (the end of the pin) and i loss one of the small c clip while the kit only came with 2 pcs of it.
can anyone suggest me what to replace with?
since i am in indonesia, i can't just send the replacement c clip only. the shipping cost will be too expensive.
thank you for the help.

miko

danjoyy25
2012.07.27, 02:33 AM
I don't use an e-clip in the lower arm. the carbon botton tray stops it from coming out.