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Old 04-12-2006, 12:52 AM   #1
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Default Loose rear????

I have a mongoose rc with a TZ18 motor....every time i nail the throttle the car spins out.....comming down the straight the rear ends just jumps around...the car is stock with the stock set-up....i need more control and stability in the rear.....ANY SUGGESTIONS????
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Old 04-12-2006, 01:14 AM   #2
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Sounds like something must me binding so bad.
Check the hinge pins and front/rear downstops, rear toes, shock shaft length and spring tensions.
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Old 04-12-2006, 08:03 AM   #3
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With an 18TZ I wouldnt be suprised. That thing has gobs of torque compared to a .12.

Welcome to the world of power , try to get on throttle smooth , like take a good 1.5 seconds to go full throttle and see how it does. Youll find the smooth throttle action will probably calm your overpowered touring car.

You probably also need to loosen the shocks in the rear , lower the rear so the car is equal ride height with the front or try a softer spring.

This will all get the rear to stick more. Good luck.
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Old 04-12-2006, 11:48 PM   #4
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sometime it could be as simple as running the wrong tires, ask around what other racers use and try that.
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Old 04-13-2006, 04:10 AM   #5
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had the same problem long time ago, was running 37 front and rear on soft setting, changed the front to 40 and all went well after that. It could be tyres most of the time.
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Old 04-14-2006, 01:26 AM   #6
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Has anyone ran a tz18 in there mongoose g4???? if so are u having the same problem???? and if u are not having this problem can u give me your set-up???
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Old 06-24-2006, 06:01 AM   #7
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Change diff Oil to something thicker than the 30000 diff oil with the stock Kit.
Try 50000 or 60000 this will help lock the diffs.
Harden the rear Springs. Put thicker oil in the rear and front.
Set the Down stops to only 3mm off the ground.Be percise.

Problem is your car is Torqueing when punching the Throttle.
The lighter side will lose torque and shift the power to the heaver side and then you lose control.
Also keep the ride hieght low like 4mm.
This is how I run Outlaw Engines in the Mongoose.
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Old 06-24-2006, 12:52 PM   #8
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If it spins on throttle input, i would rather go down in rear differential viscosity.
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Old 06-24-2006, 03:47 PM   #9
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Also make sure that none of your belts are worn out or missing teeth because this can lead to the car spinning out.
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Old 06-24-2006, 05:58 PM   #10
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also, make sure that your toe in the rear is exactly the same left to right,
with that much power, any difference in the toe will make your car lose traction
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Old 06-25-2006, 03:00 AM   #11
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I think he spins out on take off.
So higher oil density. If spinning out in turns, lower oil density.
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Old 06-25-2006, 03:04 AM   #12
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But they are right in saying to check Toe-in. VERY Important.
Slight difference in left and right and away the tail goes,especially with Low-end torque Engines.
Belt too. Check it, Belt might be slipping making the car sort of jerk.
Let us all know how it works out. This could be an interesting lesson for ALL.
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Old 06-25-2006, 04:20 AM   #13
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I had a 18TZ in my G4, car was setup sweet for the sirio evo3 but as soon as the 18 went in it was very loose also, after improving by taking off rear sway bar and softer spring and oil in diff it still came down to throttle control on acceleration out of the corners. Our track is medium to low grip.
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Old 06-25-2006, 06:28 AM   #14
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Yes . with that much power going into the car's drive train, you will need to develope a certain technique in driving it. I did the same in the last race. Had to remove sway bars to stop the fish tailing coming out of turns. I was on a small track and with med. grip. Once I took off those sway bars, the car gripped like glue. By the way it, I was running a ZX12 engine.
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Old 06-25-2006, 07:25 AM   #15
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also to add to this, track width. check to see when the rear suspension is compressed, that the dog bones still can move in the cups. when the track width is 200mm and you increase toe in it may start to bind in the rear dog bones, this caused me problems in testing untill i checked setup on the bench that night. there is only a few mm before they start to bind. but do check it with the rear suspension fully compressed.
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