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Old 11-24-2011, 08:28 AM   #1
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Default 4 tec 3.3 understeer issue

Hi,

I recently bought a nitro 4 tec 3.3 and having a little understeer issue. the car simply won't turn unless you slow down quite bit...

I took middle belt off and make it 2wd for now, but was wondering if there is posi diff i can get for the 4 tec?

Thanks,

Li
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Old 11-24-2011, 09:33 AM   #2
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Originally Posted by lsp408 View Post
Hi,

I recently bought a nitro 4 tec 3.3 and having a little understeer issue. the car simply won't turn unless you slow down quite bit...

I took middle belt off and make it 2wd for now, but was wondering if there is posi diff i can get for the 4 tec?

Thanks,

Li
Have you checked the setup? Toe, Camber, Caster, Droop, and roll center?
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Old 11-24-2011, 10:04 AM   #3
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Have you checked the setup? Toe, Camber, Caster, Droop, and roll center?
sort of,

Front and back about -1 to -2 degree camber. Front 0 to 1 degree toe out and rear is stock -1.5 toe in. i don't think i can adjust caster on 4 tec

Actually couple people i talk to told me that 4 tec isnt good at handling. I just need to see alternative way to make it better.
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Old 11-24-2011, 10:16 AM   #4
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That model of car was not designed for handeling. It is more of a top speed car. At the speeds it travels; on rubber tires, it probably won't turn on a dime.
Some of things I would do to increase steering is a stronger steering servo. Make sure your servo saver is tight.



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Old 11-24-2011, 10:28 AM   #5
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Do you run rubber or foam tires?

When running rubber you should try foam 37 shore in front and 40 in the rear. Other thing with rubber you can try is cleaning the front tires with brakecleaner.
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Old 11-24-2011, 10:55 AM   #6
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After stocker tires worn out, I use hpi rubber touring tire. I need to look into the foam tire. Does foam tire come with wheel? I need to check hobby shop for some foam tire
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Old 11-24-2011, 10:57 AM   #7
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I am assuming you are still running the stock black springs. If so, you can use associatged tc3 springs to help with tuning. For understeer, you want to soften the front springs, or stiffen the rear. Buy an assortment of springs and shock oil, and experiment. While the 4tec is not a great handling car, it can be made drivable. HPI Xpattern tires also help with traction if you want to stick with rubber.
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Old 11-24-2011, 12:03 PM   #8
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thats cool, i'll be buying the tc3 spring from hobbyshop tomorrow.

Not sure what is the stock 4tec shock oil, but i got some 40 weight shock oil I may use.
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Old 11-24-2011, 12:14 PM   #9
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Forgot to add that the tc3 springs are a tight fit over the retainers, but they do work. I believe I put 50 weight in the front shocks and 40 weight in the back. 2 hole pistons front and rear. As far as diffs go, the only ones I have seen are the Traxxas ball diffs. That would likely work well in the front, but the 3.3 would probably destroy a ball diff in the rear.
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Old 11-24-2011, 02:33 PM   #10
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just got back from playing 4 tec... 2wd was impossible to control...end up put the middle belt back on and learn to drive...
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4 tec 3.3 understeer issue-6.jpg   4 tec 3.3 understeer issue-7.jpg  
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