Line Lockers - Burnouts ;)

BJMXR · 12-12-2005, 01:45 PM

Hey all...

Just wondering what the best technique is for cutting off the rear brakes for those times where we cant resist spinning up the rears. Ive been merely riding the brakes but would prefer to have most of the bias on the front to free the braking power on the rear.

I imagine i just need to clamp the brke line on each side near the rear brakes? Or is there a single brake line under the car that will do both rears in one go? Can i get the device from Repco or something?

Im not a ****er on the roads or a hoon, but a bit of tyre smoke here and there smells pretty nice...

parawolf · 12-12-2005, 01:52 PM

Get a brake bias valve. Get it installed in your center console and away you go.

Only manufacturer I know of such things is AP Racing, but i'm sure there are others. Not sure how legal this device is on the road.

BJMXR · 12-12-2005, 01:58 PM

Thanks Parawolf...

Im thinking of something a little more simple perhaps, as im not doing them every day... dont mind getting under the car, attaching it and taking it off when im done. Something in the car would be great on the dash or centre console, but i imagine would cost too much. Im after a simple and cheap solution i think...

jcxr · 12-12-2005, 02:00 PM

Vice grips on the hose from body to rear lines works best as a"roll control". LOL

BJMXR · 12-12-2005, 02:15 PM

Can you split the hose easily? I imagine your talking of the lines that are near the spring/shocks/discs? And how tight are we talking in terms of squeezing the hose?

parawolf · 12-12-2005, 02:18 PM

I'm pretty sure that the lines through the body are metal tubes not rubber/synthetic hoses so clamping would have to be done at the caliper if you don't have braided lines.

not 100% on that. However if I was designing a car, it would be fixed metal tubes until the point where the wheel rotates where it would become braided lines.

Also clamping the rubber lines would prematurely perish the material as it would be going through forces that it was not designed to withstand.

geza · 12-12-2005, 06:34 PM

Quote:

Originally Posted by BJMXR

Hey all...

Just wondering what the best technique is for cutting off the rear brakes for those times where we cant resist spinning up the rears. Ive been merely riding the brakes but would prefer to have most of the bias on the front to free the braking power on the rear.

Hi BJMXR

Basically what you want is a reverse line locker.
A line locker is used in drag racing, when it's switched on you pump up your brakes and when you release the brake pedal your rear brakes are still on so then once you've reached stall speed you just flick the switch and go.
By reversing the solenoid in the line locker system, you flick a switch and then only your front brakes work. No more worn disks and pads just rubber.
Call Brenden at Jim Mock MotorSport, when I asked him about it he said it would cost about 400-500 bucks then I said maybe, oneday.

Hope this helps.
Cheers
Gerry

galaxy xr8 · 12-12-2005, 06:47 PM

Clamping the hose's is just not worth it, it's dangerous and stupid, if you just want to do it on the odd ocassion like you say and only want a bit off smoke, it's easy, foot on brake and foot on acelerator, instant smoke.

justa6 · 12-12-2005, 09:20 PM

Quote:

Originally Posted by galaxy xr8

Clamping the hose's is just not worth it, it's dangerous and stupid, if you just want to do it on the odd ocassion like you say and only want a bit off smoke, it's easy, foot on brake and foot on acelerator, instant smoke.

yeah i'm with galaxy xr on this one, JUST TRAMP THE THING

Steve_T · 13-12-2005, 01:52 AM

Yeah, as for clamping the hoses, IIRC there's a couple of thousand psi of pressure in the brake lines when they're applied, so to stop that sorta pressure getting through you'd have to clamp the hoses so hard it'd certainly be damaging to them and thus dangerous.

Methinks even with line locker or bias control, ABS is always gonna bugger ya with burnouts - ABS sees rear wheels going flat-out and fronts not moving, so will try to decrease pressure on front brakes and maybe increase on rear - I don't reckon you'd ever be able to hold it really well but I've not really tried.

BJMXR · 13-12-2005, 11:18 AM

I dont think ABS seems to come into play actually, ive admittedly only done a few so far and theres NO problem with getting them spinning and having plenty of instant smoke while sitting stationary. I just imagine the heat build up in the brakes for starters and the extra load on the engine FROM the brakes is ultimately not ideal.

If you got an XR8 and havent given it a go... i guarantee you'll be suprised what you can do... even 1st gear, i might try to snap second next time... and either way, its another way to have a bit of fun in your beast!

Steve_T · 13-12-2005, 01:08 PM

Maybe ABS only kicks in when you stomp the pedal hard in an emergency - that's what I originally thought from reading the owners manual, but later I read stuff that made me think it's active all the time - which could be wrong.

/me has an auto XR8 ute and can't really do burnouts :( I know torque limits in ECU have something to do with it - maybe (most likely) it's my technique as well - I don't really know how LOL - how hard to hold brake and how much to stop on throttle etc.

niko · 13-12-2005, 01:12 PM

Quote:

Originally Posted by BJMXR

extra load on the engine FROM the brakes is ultimately not ideal.

and the fact that your reving out your engine on the spot has no bearing on the matter? :P

BJMXR · 13-12-2005, 01:21 PM

Quote:

Originally Posted by niko

and the fact that your reving out of your engine on the spot has no bearing on the matter? :P

I know ;) but im thinking that without the brakes grabbing heavily on the rears id ultimately be putting less load through everything which can only be a good thing. Clearly not doing a burnout would put a lot less stress on everything, but i think another one will have to happen sometime soon

niko · 13-12-2005, 01:23 PM

just do it on a cold night, on private roads ofcourse:P

turbo00007 · 13-12-2005, 01:44 PM

A brake job shouldnt put to much pressure on system as long as you dont hold it for 5 minutes

S3SR · 13-12-2005, 11:12 PM

dont you just get the car moving because of its weight and its a manual (10km/h is fine) depress the clutch rev to about 3,4,5 thousand revs pop the clutch and wait for smoke.

if u have LSD i recommend not doing this while the car is not moving as this may cost into the $1k mark my SR felt most of it

JC · 14-12-2005, 12:46 AM

Why not just buy some aircraft spec wheel chocs, put them in front of the front wheels and then you will have burnout city.

**Mechan1k** · 14-12-2005, 08:22 PM

Quote:

Originally Posted by JC-XRWgn

Why not just buy some aircraft spec wheel chocs, put them in front of the front wheels and then you will have burnout city.

Borrow some from a place that has a dyno ...

Cam · 14-12-2005, 09:12 PM

Or a simple power upgrade will do just fine, my car happily goes into 2nd and smokes em up, creates more then enough smoke for me, if you wanna keep going, crank the wheel and go into another doughie instead of driving up the road, easy ;) lol
Cam

XR6Stu · 16-12-2005, 10:32 AM

Quote:

Originally Posted by Steve_T

Yeah, as for clamping the hoses, IIRC there's a couple of thousand psi of pressure in the brake lines when they're applied, so to stop that sorta pressure getting through you'd have to clamp the hoses so hard it'd certainly be damaging to them and thus dangerous.

Methinks even with line locker or bias control, ABS is always gonna bugger ya with burnouts - ABS sees rear wheels going flat-out and fronts not moving, so will try to decrease pressure on front brakes and maybe increase on rear - I don't reckon you'd ever be able to hold it really well but I've not really tried.

Ive done a fair few line lockers in my XR, with ABS, and it hasnt come into play yet. It mainly seems to come into play when I jump on the brakes in a hurry... In answer to the original question, I reckon just do it traditional style is the best way to go about it! Cheers!

superroo · 16-12-2005, 03:48 PM

The way my ute does em (no abs, manual), 1st gear dump at bout 4 grand then on the brakes with left foot. I don’t have a problem regulating the pressure with left foot, you feel the pedal as you go.
Trust me, it works well. With no LSD I can still leave two wheel marks on the ground, it just depends on my brake pressure.

Enjoy

trick_xd · 17-12-2005, 12:16 PM

Quote:

Originally Posted by BJMXR

Hey all...

Just wondering what the best technique is for cutting off the rear brakes for those times where we cant resist spinning up the rears. Ive been merely riding the brakes but would prefer to have most of the bias on the front to free the braking power on the rear.

I imagine i just need to clamp the brke line on each side near the rear brakes? Or is there a single brake line under the car that will do both rears in one go? Can i get the device from Repco or something?

Well the cheap way to do it is to buy a plastic Brake hose clamp you can get them for about $10 the problem with this is that brakes are about 3000psi and a clamp will let the fluid through and then you will find that they will be locked on untill you take the clamp off .

What I have done is get a ball valve and put it inline under the bonnet next to the brake booster the total cost of this was under $20 and i did it in my shed in under 1hr .
The bad/good thing with this is that if i want to skid then i have to get out and turn the handle. and from that point on there is no REAR brakes at all untill i turn the handle back .

HLC · 17-12-2005, 07:47 PM

ehhhhh save your money and dont do burnouts

: also, i scared myself the other night with a scary experience with the LSD. so i wont be doing burnouts for a while

Baboon_AU · 18-12-2005, 09:29 PM

burnouts, very fun to do especially in the wet, i don't do em very often but, i'm worried something may go horribly wrong with my car!

BJMXR · 22-12-2005, 03:11 PM

Gee don't know who this is ;) :hihi:

But i bet he had fun! I also bet he just rode the brake through the burnout...

AnthonyQLD · 22-12-2005, 04:16 PM

Who would do suck a thing

:

Mr Mooch · 22-12-2005, 04:52 PM

I always find that rentals do the very best burnouts.
You seem to be able to rev the clappers out of them and slot them into drive - instant smoke.

Have a great Christmas
Mr Mooch