RC India

RC Models => Cars => Topic started by: davinci on November 19, 2010, 10:19:13 PM

Title: TT SparrowHawk DX Diff Lock ::
Post by: davinci on November 19, 2010, 10:19:13 PM
Hi Guyz,

              Recently i brought a TT sparrohawk DX, but it  doesn't drift as expected. i came to know that the diff should be locked to have
              a better drift.
              Guyz please help me on this-----How to lock the back differential? is there any addon to implement?
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: anwar on November 20, 2010, 12:47:26 AM
Lots on interesting links !

Using a piece of glow fuel tube : http://www.rcspares.com/drift-rc/lock-your-TT01-differential.html

Lots of techniques : http://sflrcdrift.com/yabb/YaBB.pl?num=1172447832/0

BTW, I will wait for the true car guys to respond... please do not take any steps before you hear from them.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: anwar on November 20, 2010, 12:48:18 AM
http://www.youtube.com/watch?v=GMbbyxaI_BY
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: iamahuman on November 20, 2010, 05:38:27 AM
On the traxxas summit,you can lock the different differentials via the radio itself.Looks like you do not have any mechanism like that.

If it is a 4wd(which I believe it is),it should drift easily.Just hit a high speed,hit full brake and turn simultaneously.And also,if you do not have slicks,put some tape on your tires.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: davinci on November 20, 2010, 09:51:51 AM
Thank you guyssssssss................
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: davinci on November 20, 2010, 02:50:31 PM
hi,

   i found other addon -- Solid Axle available in TT partlist.
   even though it costs couple of 100,  its a wise replacement for diff.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: traxxrc1 on November 20, 2010, 06:13:47 PM
Quote from: iamahuman on November 20, 2010, 05:38:27 AM
On the traxxas summit,you can lock the different differentials via the radio itself.Looks like you do not have any mechanism like that.


Summit locks are different. They are like gears of real cars, one for low speed high torque, other for high speed and intermediate torque.
The lock this guy is tocking is something else.

Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: traxxrc1 on November 20, 2010, 06:16:35 PM
Rather than locking the differential which is a real difficult task(atleast for me) i would suggest you to go for a spool if availabe. That is exactly what u want.

The other thing you can do is get a 19T TTr motor which might cost around Rs. 700 which will provide more acceleration to you.
Going for a BL motor will be even better
Also drift depends where you run your car so keep that in mind and try some plain floor rather than concrete or asphalt.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: iamahuman on November 20, 2010, 07:04:55 PM
So the lock on the summit is for shifting.But I have seen diff locking on rock crawlers.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: ANTA on November 20, 2010, 08:32:06 PM
Quote from: iamahuman on November 20, 2010, 07:04:55 PM
So the lock on the summit is for shifting.But I have seen diff locking on rock crawlers.
I don't think differential lock is for shifting but normally used at very low speeds. Differential lock prevents the free rotation of one wheel when the other one is under load.
http://www.youtube.com/watch?v=vyPCjaWKtcM
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: iamahuman on November 20, 2010, 08:42:03 PM
Yeah.It allows for a tighter turn especially when rock crawling.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: traxxrc1 on November 21, 2010, 10:08:06 AM
Quote from: iamahuman on November 20, 2010, 07:04:55 PM
So the lock on the summit is for shifting.But I have seen diff locking on rock crawlers.

Summit gives you the ability to lock the differentials and shift from low to high gear right from the transmitter"


Summit can do both.
one is low gear for a 70:1 ratio and high range" with a 25:1 ratio for dirt-slinging speed.
Thre is and additional switch called T-Lock which for locking differentials.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: xplosifly on November 21, 2010, 01:34:56 PM
Hi guys,
I own a Losi Comp. Rock Crawler which has a DIG Unit installed on it. The DIG is a differential locking system. As also seen on the summit how this system works on crawlers is that the hobbyist can remotely from his transmitter lock either his front or rear differentials. This is essential in competition rock crawling as it enables the user to take tighter turns or to use the additional grip to climb steep gradients. I think the summit also has a module where in it can use different gear ratios and can shift between them remotely via a switch on the transmitter.
Also in the Losi Competition Crawler the wheels are always locked in neutral unless you apply forward/reverse. I believe this is the case in all crawlers. This enables the crawler to hold its position on any kind of gradient even in neutral unless the user wants the little lizard to move forward or backward.
Its fun using the DIG actually. somethin you dont really see in 1/10 or 1/8 buggies.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: mail4ajo on November 24, 2010, 10:34:29 PM
Guys, the spool and addons are more expensive option. I had responded to this on the other forum. You can use heavier diff oil and naturally lock the diffs to get drifting action. Summit uses a crawler type diff lock system, I think.

or try the fuel tubing method which anwar mentioned. Its easier and you can revert to your old setup faster.
Title: Re: TT SparrowHawk DX Diff Lock ::
Post by: traxxrc1 on November 25, 2010, 02:24:03 PM
ya nice idea ajo, i used 7k and 10k for rear and froont