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-   -   The New MRCG1.1 (http://mini-zracer.com/forums/showthread.php?t=31910)

color01 2009.06.05 04:53 AM

The New MRCG1.1
 
http://www.greyscalerc.com/images/st...rcg11-logo.png

Introduction:
The MRCG1.1 is the evolution of our now world-famous MRCG, designed to be faster, stronger, more user-friendly, and ultimately better in every way. Based on Kyosho’s proven Mini-Z MR-02 platform, the new MRCG1.1 features geometry updates and other refinements throughout the car, making it the new ultimate 1/28 open class pan car chassis!

http://www.greyscalerc.com/images/st...g11/pres01.jpg


At a glance:
- Built on the race-proven Mini-Z MR-02 platform; uses many MR-02 parts
- Version 2 of our trademark Virtual Center Pivot rear suspension
- Tools-free quick-release battery system designed for endurance racing
- Ultra-low center of gravity and polar moment of inertia
- 15% weight reduction over MR-02
- 1.5mm quasi-isotropic woven graphite chassis
- 0.8mm FRP flex plates and small chassis parts
- 6061 aluminum alloy used throughout; brilliant orange anodized finish
- Sliding, 1-piece motor mount allows easy gear mesh adjustment
- Unique tierod steering system with optimized Ackerman
- Fully adjustable suspension: spring rate, anti-roll, damping, preload, droop, ride height, roll center, rear steer, camber and toe
- 94-100mm adjustable wheelbase
- Compatible with Mini-Z MR-02 bodies and polycarbonate bodies


Features:

Ultra low CG, weight, and polar moment of inertia

http://www.greyscalerc.com/images/st...g11/pres16.jpg

The MRCG1.1 is a pure racing chassis, just like its predecessor. Every single element of the chassis is lowered to the maximum physical limit: the motor and batteries are flush with the bottom of the chassis, and the batteries lie in the absolute center of the car to achieve an optimal weight distribution and polar moment of inertia. Woven graphite is used extensively in the chassis for its light weight and high strength; where flexibility is needed, thin FRP is used for its durability and adds a stylish touch of color. The end result is an extremely low CG and polar moment of inertia, and a massive 15% weight reduction vs. the MR-02, creating a chassis of unparalleled corner speed and steering response.

Virtual Center Pivot Version 2 rear suspension

http://www.greyscalerc.com/images/st...g11/pres07.jpg

The MRCG1.1 receives a comprehensive update of the Virtual Center Pivot suspension pioneered by the MRCG. The two flex plates have been combined into one wraparound flex plate, providing extra durability and holding the center spring more securely in place. New rear steer spacers allow the rear axle to provide passive rear steering assistance as the G-forces climb: whereas a normal Mini-Z understeers at high speed, the MRCG1.1 dives into and out of corners faster than ever before.

The smaller details have received updates too: the new center spring mount now uses a locknut to adjust preload, and the side spring mounting locations have been moved outwards, allowing for greater leverage and screw-turn adjustability. Other details have carried over from the MRCG: the flex plates still have unlimited droop, and optional shims can be used to adjust both roll center and rear steer. Altogether this makes the MRCG1.1's VCP V2 rear suspension the most advanced on the market, and your lap times will certaily show it!

Lightweight, user-friendly rear pod

http://www.greyscalerc.com/images/st...g11/pres10.jpg

The MRCG1.1’s rear pod is among the lightest on the market at a scant 5 grams. The lightweight motor mount accepts any drilled 130-can motors; it doubles as an extra standoff on the pod, stiffening its structure to further improve handling. The mounting screws for the motor mount are on the top and bottom of the rear pod instead of near the differential, making gear mesh adjustment and motor removal a breeze. The rear axle is held by updated bearing carriers that allow ride height adjustments in 0.5mm increments, and the bottom plate has a center mark for ease of use on setup boards.

Stiffer, stronger revised front end

http://www.greyscalerc.com/images/st...g11/pres12.jpg

The MRCG1.1 receives several geometry updates in the front end. New triangulated front lower arms stiffen up the front end for sharper steering response. They resist collisions better too, and are easier to remove for maintenance. The top brace has been updated with 2 degrees of caster: this complements the stiffer front end well, increasing corner exit speed and stability at high speeds. Like the original MRCG, by removing the top brace you can change springs, knuckles, ride height, droop and preload, all without removing the kingpins.

http://www.greyscalerc.com/images/st...g11/pres13.jpg

The MRCG's unique steering rack has been updated too. Three sets of overlapping holes in the tierod mount allow the toe angle to be changed without having to remove any parts. The tierod itself features cross bracing to make it more durable and precise. An optional steering linkage adapter for the tierod is available, for those who would rather use a ball linkage instead of the nylon tubing and aluminum tierod horn provided in the kit.

Quick-release battery system

http://www.greyscalerc.com/images/st...g11/pres20.jpg

The MRCG's innovative no-tools quick-release battery strap carries over to the MRCG1.1 with no changes. Designed with endurance racing in mind, this system keeps tweak consistent from pack to pack and allows the fastest battery changes of any 1/28 RC car. All it takes is a twist of the latch and the battery strap flips up; no need to fumble with clips, screws, or nuts any longer. As a bonus, the strap doubles as a radio tray, and the new rear steer spacers act as battery braces, keeping the pack in place even in the hardest collisions.

New wheelbase options

While the original MRCG led the market by fitting under both 94 and 98mm-wheelbase Autoscale bodies, the MRCG1.1 ups the ante by adding two more options: 96 and 100mm. For certain tracks where 94mm is too short and 98mm is too long, the new 96mm wheelbase option allows the MRCG1.1 to utterly dominate the competition. And for the largest, most wide-open tracks, the 100mm wheelbase option provides an extra measure of stability for battling against 1/24 or even 1/18 RC cars (yes, it can go that fast). With four wheelbase options, the most of any 1/28 pan chassis, the MRCG1.1 delivers maximum performance on any size track.

Accepts both hard plastic and polycarbonate bodies

http://www.greyscalerc.com/images/st...g11/pres18.jpg

The MRCG1.1 accepts both hard plastic bodies (Kyosho Auto Scale Collection, Atomic VDS and VDSII, PN Pan Car, etc.) and polycarbonate bodies. Because of its 94mm and 98mm wheelbase compatibility, the MRCG1.1 will fit any Mini-Z MR-02 body -- they clip right onto the chassis as you would with a regular Mini-Z. For polycarbonate bodies, mounting points for body posts are provided and are spaced far apart to provide extra stability to the shell (body posts not included.)

Compatible with most Mini-Z MR02 parts

Being based off the Mini-Z MR-02, the MRCG1.1 is compatible with all sorts of MR-02 option parts: kingpins, front knuckles, springs, bearing sets, motors, differentials, dampers, wheels, tires, etc. In the name of cost-effectiveness, we do not include any MR-02 parts in the kit. Convert your MR-02 to an MRCG1.1 or build the MRCG1.1 kit from the ground up, the choice is all yours!


What You'll Need:
- CA glue
- Light threadlock
- Mini-Z MR-015/02 knuckles, kingpins, springs, spring perches, C-clips, ball differential,
- Mini-Z disk damper assembly
- Mini-Z top shock or oil damper
- Mini-Z MR-01/015/02 wheels, tires, bearings
- M2 locknuts (4)
- Micro servo (no wider than 23mm)
- Thin double-sided tape for servo
- Receiver and ESC (or combo)
- Receiver-compatible transmitter (and transmitter battery pack)
- Mounting tape for receiver and ESC
- 130-size motor, Mini-Z pinion
- Battery pack
- Charger appropriate for battery pack
- Hard plastic or Lexan/polycarbonate body, 94-100mm wheelbase

color01 2009.06.05 04:53 AM

High-Res Gallery:

http://www.greyscalerc.com/images/st...1/pres01-s.jpg http://www.greyscalerc.com/images/st...1/pres02-s.jpg http://www.greyscalerc.com/images/st...1/pres04-s.jpg
http://www.greyscalerc.com/images/st...1/pres05-s.jpg http://www.greyscalerc.com/images/st...1/pres06-s.jpg http://www.greyscalerc.com/images/st...1/pres07-s.jpg
http://www.greyscalerc.com/images/st...1/pres08-s.jpg http://www.greyscalerc.com/images/st...1/pres10-s.jpg http://www.greyscalerc.com/images/st...1/pres11-s.jpg

color01 2009.06.05 04:53 AM

High-Res Gallery (cont.):

http://www.greyscalerc.com/images/st...1/pres12-s.jpg http://www.greyscalerc.com/images/st...1/pres13-s.jpg http://www.greyscalerc.com/images/st...1/pres14-s.jpg
http://www.greyscalerc.com/images/st...1/pres15-s.jpg http://www.greyscalerc.com/images/st...1/pres16-s.jpg http://www.greyscalerc.com/images/st...1/pres17-s.jpg
http://www.greyscalerc.com/images/st...1/pres18-s.jpg http://www.greyscalerc.com/images/st...1/pres19-s.jpg

mini-z 2009.06.11 11:28 PM

In Stock/Shipping from shop.tinyrc.com!

Greyscale Racing MRCG1.1 Competition Pan Chassis

skyler 2009.06.23 07:09 PM

New MRCG1.1
 
Hi Brian, Love the new car and all the updates. Really also like the SS hardware this time around. Would have liked to have seen a wide track option...

color01 2009.06.23 10:41 PM

Thanks skyler! I'll give the wide track option another round of thought; I think there actually may be enough interest to warrant it this time. :)

skyler 2009.06.26 04:48 PM

Quote:

Originally Posted by color01 (Post 352513)
Thanks skyler! I'll give the wide track option another round of thought; I think there actually may be enough interest to warrant it this time. :)

That's awesome!

Davey G 2009.07.10 11:23 AM

I have been testing the MRCG1.1 extensively the past few weeks and here is my current setup:

FRONT:

PN Yellow springs, .010 shim under knuckle, .010 shim on top of bumpstop
Kyosho 3.5mm bumpstop, PN 2deg knuckles, Ruby Lube for Dampening, tie rod centered for 0 degree toe, 2mm offset PN 20mm rims.

REAR:

Axle all the way up (low ride height) steel diff axle, my own central pivot (see pics) rear pod plate is level with main chassis at ride height, stock flex plates, low CG flex plate position, red springs on top and bottom of DPS, very little preload on DPS springs, Ruby Lube for dampening, Kyosho center shock (50wt oil) with Kyosho black spring, 2mm offset PN 20mm rims.

MISC:
54-12 gearing to move the motor forward
stand alone electronics decased
Futaba servo as suggested by Greyscale racing

Central pivot using a 4-40 grub screw and a sharpened 2mmscrew:
http://i178.photobucket.com/albums/w...titled-1-1.jpg

http://i178.photobucket.com/albums/w...ski/black1.jpg
http://i178.photobucket.com/albums/w...ski/black2.jpg
http://i178.photobucket.com/albums/w...ski/black3.jpg

Felix2010 2009.07.10 11:46 PM

Awesome job Davey:D

Could you tell us the RTR chassis weight please?:D Very curious:D

Davey G 2009.07.11 12:38 PM

179 grams which is without any transponder. :D

B-main 2009.07.11 02:01 PM

very nice ride .ill trade you my girlfriend for it shes got some hop ups

Davey G 2009.07.11 09:36 PM

I will update my pics sometime 2morrow showing it with a body and complete with body mts, Futaba servo etc.

Trade it for your girlfriend huh Spakey??? PM me pics..:D

EMU 2009.07.12 12:51 AM

That car is so easy to drive, and has a lot of corner speed. I was putting down good laps in practice when Dave let me try it. I was driving at about 75%, basically backing off early and driving nice and smooth just to get a feel for it... The rear is always very planted, and the car rotates well on and off throttle. My second lap with it was probably faster than any lap I did that night...

I will be testing my Pan stock MRCG next track day (which unfortunately will be in more than a week). I hope to have similar results.

The small tweaks that dave made with the servo gives very little play in the steering. It is much less than an MR02. Which means that the control, especially at speed is very smooth. I will be getting some of the Blue Bird mounts and adding them to my setup as well. Dave, do you know the model number for the parts, or do they come with a servo?

Davey G 2009.07.14 03:01 PM

Here are the most recent pics of my car. Its now down to 175 grams, I want to drop a few more grams because of the custom stickers that will go on the bod this week.

http://i178.photobucket.com/albums/w...boski/gsr2.jpg
http://i178.photobucket.com/albums/w...boski/gsr3.jpg
http://i178.photobucket.com/albums/w...boski/gsr4.jpg
http://i178.photobucket.com/albums/w...boski/gsr5.jpg

ianc 2009.07.14 05:16 PM

Dave,

Really would like to know what you're using for the ball linkage for your steering servo if you could take a few moments to let us know...

ianc


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