por cpl em 21/05/12

EK4 - Reforço no Chassi

(EK4 - Chassis Reinforcement)

Chassis Reinforcement/ Body Rigidity Modification
EK4 Chassis Reinforcement Guide

Chassis reinforcement/ body rigidity modification isn't something that should be performed without careful thought. It all depends on different car models and their structure. Each car has a weakness and to pin point that is the key. This guide will show you the best chassis reinforcement for you car and specification.


Problem: I Wanto to step on throttle while cornering

In order to make the EK4 into the ultimate track car, a stiff suspension (F 18-20kg/mm, R 14-16kg/mm) and high grip tires are recommended. If an LSD is added to that setup, the body reinforcements should carefully be selected.
At a minimum, choose a 9 point roll cage that has a diagonal and side reinforcement beams. The side bars should extend from the door area to the main hoop for a optimal 11 point setup. By having effective side bars on the cage, the weight transfer to the front during hard braking becomes easier. Here, the rear begins to lift, and with the use of the LSD a great cornering can be pulled off. A total tune of the vehicle should be done, from brake balance, vehicle height, and camber to achieve the best results.

Solution: Take off the stock strut bars and add a 9-point roll cage

The front strut bar, triangle fender support, and a rear sway bar is a absolute must. But when using racing tires, be aware that too much chassis reinforcing might have negative effects. These cars actually require a little bit of chassis flex. The EK4 stock chassis bars have been removed on this vehicle to yield flex. This theory was adopted from the N1 races.
Spot welding can be done as well. Rather than stiffen up the chassis like the steel bars, this absorbs the flex as a whole. An experienced driver should be able to control this aspect on a race track.


9 point roll cage + removal of stock bars
A 9 point roll cage should be enough to stiffen up the entire vehicle. The stock lower tie bar should be removed for better control.




Get a two point strut bar
Best results can be seen from a strut bar with racing tires. A three point strut bar that connects the struts and the firewall may have negative effects.



LSD equipped cars should have side bars
The point of a side bar is to reinforce the front and the rear of the car. While cornering, the chassis attempts to droop, but with an LSD there are no worries.




Adopt the body roll for the rear
Strut bars are not recommended on some vehicles. The side sway on this vehicle is designed to keep all 4 wheels on the ground. A rear strut bar is not recommended with high grip tires.




Pillar bars are not necessary
Pillar bars are included in some roll cages but they're not necessarily needed. The stiffness becomes too much t this point. The best way is to gradually add reinforcement bars one by one.




Urethane injection
On the side seals, urethane may be injected for stiffening of the chassis. This is a good modification for those who don't want a roll cage.




source: http://team99ers.2.forumer.com/index.php?showtopic=362

keywords: EK4 CHASSI REFORCO RIGIDEZ CURVAS