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Can't Do A Launch

jaschippy
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jaschippy Enthusiast

jaschippy

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Has anyone got any idea why my car won't launch. There are no fault lights coming on in my dash And the 4wd seems to work a little when im driving it hard, but when I try and do a launch it spins the wheels through most of 1st gear and slowly takes off. The highest i've seen my torque meter go is around 20 to 30 %. When you do a launch shouldn't the torque meter hit 50% please help.

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Pezhead Grand Master

Pezhead

Posted
Posted

Make sure the atessa system is bled and you have fluid in the reservoir in the boot. Do a search in the forums here on info on how to bleed the system.

Jack the car up on stands so that all the wheels are off the ground and put it in 1st and let it idle. Should spin all 4. If you don't think it is applying all 50% then pull the front drive shaft and do the same. When the rears spin but the fronts don't the Atessa should try to do 50% reading on the gauge. I just did that with mine tonight to diagnose my diff problem.

I'm having Atessa problems myself, but I hope for your sake your problem isn't as bad as mine. Mine appears to be the front diff is shot.

Hope that helps.

Duncan Grand Master

Duncan

Posted
Posted

well the gauge doesn't get to 50% it doesn't read a %at all (kg/m or something, I can't remember).

but anyway, if the 4wd light is not on, and 4wd doesn't seem to be working it is most likely a transfer case problem....(eric is special, and lucky). You could try his test that should tell you if the fronts are getting any power. if they aren't pull the line off the back of the gearbox (car still on stands) and start the car - should pump fluid out pretty rapidly. if not the pump is farked.

jaschippy Enthusiast

jaschippy

Posted
  • Author
Posted
Make sure the atessa system is bled and you have fluid in the reservoir in the boot. Do a search in the forums here on info on how to bleed the system.

Jack the car up on stands so that all the wheels are off the ground and put it in 1st and let it idle. Should spin all 4. If you don't think it is applying all 50% then pull the front drive shaft and do the same. When the rears spin but the fronts don't the Atessa should try to do 50% reading on the gauge. I just did that with mine tonight to diagnose my diff problem.

I'm having Atessa problems myself, but I hope for your sake your problem isn't as bad as mine. Mine appears to be the front diff is shot.

Hope that helps.

Thanks pez In my car I am getting some power to the front I can feel the car pull it self out of wheel spin when I rev out 1st gear and do a hard change to 2nd. Also when I take a corner quickly and it steps out it I can feel the steering wheel stiffen up as the car pulls it self out of oversteer,but I only have had a max of 30 % come up on my torque meter. The problem is it takes a very long time to pull it self out of wheel spin when i do a 1st gear launch. I,ve tried bleeding the system, do you know where the bleed point is at the back of the car on a r34 gtr? Is it on the pump itelf?

TommO Grand Master

TommO

Posted
Posted

It'll only apply as much as it thinks it needs.

Have you got good rubber? What clutch? How much power? If I launch mine it'll also spin all the way through first... but I do see 50% on the meter, and it's just power with an aggressive clutch thats making it spin.

jaschippy Enthusiast

jaschippy

Posted
  • Author
Posted
It'll only apply as much as it thinks it needs.

Have you got good rubber? What clutch? How much power? If I launch mine it'll also spin all the way through first... but I do see 50% on the meter, and it's just power with an aggressive clutch thats making it spin.

If its power making it spin u should be spining all 4 wheels through first gear. Mine is only spining the rears I got new tyres on it stock power. Does anyone know a work shop in perth that can fix the attesa system?

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