OSC Posted August 21, 2006 Share Posted August 21, 2006 hey im lookin for a lsd for my escort estate and have been lookin at falcon diffs coz they are strong and easy to get lsds for. but the closest to escort ratio i can find is 3.45 ive heard commodore diffs are the same but that you can get them in a 3.9. im looking for 3.9 - 4.1 ratio or a 3.77 at the tallest anyone got any ideas???? Quote Link to comment Share on other sites More sharing options...
peteretep Posted August 21, 2006 Share Posted August 21, 2006 whats it being used for? a falcon diff would only really be used in drag racing as they are so big and heavy Quote Link to comment Share on other sites More sharing options...
Burntrubber Posted August 21, 2006 Share Posted August 21, 2006 Your talking about the falcon Borgwarner diff I guess if so VK onwards Commys use them aswell and you can get a 2L ratio which is 4.1:1 Quote Link to comment Share on other sites More sharing options...
Gaz Posted August 21, 2006 Share Posted August 21, 2006 Best ratio is 3.54:1. 3.45:1 is damn close. Id run that if you have a 2l and 5speed. They are perfect. I think the LSD he is thinking is out of the old utes. Maybe XF Quote Link to comment Share on other sites More sharing options...
OSC Posted August 21, 2006 Author Share Posted August 21, 2006 tru could u use a ute lsd with the commy crown wheel and pinion??? and going into a escort with supercharged 2L and w55 box that will be doing skidz everywhere and generally gettin the shit raped out of it Quote Link to comment Share on other sites More sharing options...
Gaz Posted August 21, 2006 Share Posted August 21, 2006 Why would you want to use the commy pinoin and crown? Id go Hilux if I was you. So many ratios and just as much work to get into car. Just personal preferance however. Quote Link to comment Share on other sites More sharing options...
OSC Posted August 21, 2006 Author Share Posted August 21, 2006 hilux is more expensive plus should be ford and hilux will break before falcon i wanna keep it ford and coz i can get disc brakes on the falcon lsd and they are very easy to cum by Quote Link to comment Share on other sites More sharing options...
Burntrubber Posted August 21, 2006 Share Posted August 21, 2006 I have an XF LSD center with a 2L VN Commodore 4.1:1 crown and pinion. Quote Link to comment Share on other sites More sharing options...
drftnmaz Posted August 21, 2006 Share Posted August 21, 2006 yea hilux is very hard to get anything lower than 4.11 very easy to get anything above. the borgwarner lsd's can wear out pretty easy if used fro skids but are soo cheap to get who cares if you goto pick-a-part you'll notice all the 2l commys are missing there diff heads because everyone grabs them fro conversions. Quote Link to comment Share on other sites More sharing options...
OSC Posted August 24, 2006 Author Share Posted August 24, 2006 um does anyone know what rpm you would be pulling in 4th (1:1 gbox ratio) at 100kph with a 3.45 diff Quote Link to comment Share on other sites More sharing options...
CaMpylobacter Posted August 24, 2006 Share Posted August 24, 2006 form my rancid calculations.... assuming you're running around a 185/70r13 sized tyre (seems to be a common size on stock escorts) you'll be doing around 3100 rpm, or thereabouts, with a 3.45 diff. seems a little low to me......... what size tyres are you on, as per factory? Quote Link to comment Share on other sites More sharing options...
Random Posted August 24, 2006 Share Posted August 24, 2006 Ya falcon diff going to need shortening. Thats housing and axles. plus relocating mounting points for shocks and springs. Fair bit of cash. Just an idea but you may use a capri diff, 3 Litre type. Altho trying to find one of those will be hard. (havent tried but someone may know of one)you could also try cortina. A Cortina 6 would be mint as its a 6 cyl falc diff factory shortened, altho the gears would be suited for low revving high torque engine - high revving low torque engines. so the diff head swap will be in order. Altho they are a burnout car to start with Also escort diff below 3.9 get smashed becaues of skids, hard driving. The lower number is like riding a bike in a higher gear. It puts huge loads on the pinoins and spider gears (they the ones in the housing, the small ones) and they smash. i have been told that 4.4 gears are hard to find but hard to break. Also, just a stupid point, things break because of traction. if you have no traction then things wont break. if you have enough power to simply spin the wheels, no major stresses are put on the driveline. eg, turn a corner in the wet and boot it. But when you dump the clutch with revs on board, you shockload the whole driveline to break traction at the tyres. Mega stress on every component from the engine to the tyres. If you got bikkies on (thin tyres) they will spin up easy as. If you pump up ya tyres to 35-40psi they will spin up easy too. (appy both and it can be rather fun...) But back to your issue, it might be easyer and cheaper to find a second hand Quaife head or the likes and put that in the original housing. Not sure if standard axle splines will go into the new head so some of those may need to be souced too. Quote Link to comment Share on other sites More sharing options...
OSC Posted August 24, 2006 Author Share Posted August 24, 2006 escort axles break as soon as u fix the spider gear breakin issue (ie locker) cortina 6 cyl diff still need shortening and non lsd can find a falcon diff lsd for about 50 - 200 bucks depending on condtion etc also falcon means i could have rear discs if i want and shortening is lile 400 + stud pattern change = 80 capri lsd means going to a quaife one which is real expensive and i shouldnt have any lack of power looking for and wont stop throwing money at it till i have 200rwkw want to have top speed at about 225 - 245 kph and about 6500 - 7000 rpm in 5th with the w55 toyota box im not keen on a locker or else would simply fit shortened cortina diff Quote Link to comment Share on other sites More sharing options...
corrupt Posted August 24, 2006 Share Posted August 24, 2006 form my rancid calculations....assuming you're running around a 185/70r13 sized tyre (seems to be a common size on stock escorts) you'll be doing around 3100 rpm, or thereabouts, with a 3.45 diff. seems a little low to me......... what size tyres are you on, as per factory? when the tina was 4 speed, i would do 2750~rpm at 100 in 4th, in 5th gear now im doing 2300~rpm at 100. standard 2L diff 3.75 ratio, 205/60/13 tyres. i have a aussie 6 cortina diff going in soon, with a falcon 3.45 lsd, i think that at 100 in 5th with this ratio, my rpm will drop to about 2000? is that right? lower the ratio, less accel down low, more speed top end? Quote Link to comment Share on other sites More sharing options...
OSC Posted August 24, 2006 Author Share Posted August 24, 2006 thats right im running 215/50/13s when you get your falcon diff in id be real keen to know the speed obviously it will put ur speedo out but id be interested in what rpm your pulling at 100kph Quote Link to comment Share on other sites More sharing options...
Burntrubber Posted August 24, 2006 Share Posted August 24, 2006 I think you will find that shortening a diff costs a bit more than $400. Diffs R Us for example will charge about $1000 just for the diff then there's the drive shaft and then setting up the brakes if there disks it wont be just a matter of hooking them up . Quote Link to comment Share on other sites More sharing options...
Gaz Posted August 24, 2006 Share Posted August 24, 2006 What Random said above is some pretty good info. Just to add to the lower ratio diffs breaking easier. The escort 3.54:1 diff have larger spider and crown from memory so blowing these should be harder. Axles do tend to become an issue in escorts if you lock the diff. But what would ra rather blow? An easy to replace axle or a hard to find expensive 3.54:1 diff head or worse, gbox? We are lucky, escorts have pretty strong diffs for there size in the first place. Quote Link to comment Share on other sites More sharing options...
Gaz Posted August 24, 2006 Share Posted August 24, 2006 till i have 200rwkw 200kw with what engine? If its torquey engine then youll need hilux or the falcon like you said. Well if you wanna be throwing bnouts everywhere anyways. Quote Link to comment Share on other sites More sharing options...
OSC Posted August 24, 2006 Author Share Posted August 24, 2006 the supercharged pinto which seems by wat rt was saying to be a very torquey engine with some forced induction hence forth the falcon diff is a must Quote Link to comment Share on other sites More sharing options...
spacie Posted August 24, 2006 Share Posted August 24, 2006 ummm dunno wat ratio my diff on the scrot is (im told its a high ratio one) but im pulling around 3500 revs at 100 km/h with some mild mods (carb, filter & zorst) on 13x6 wheels (thats on the 1300 by the way) Quote Link to comment Share on other sites More sharing options...
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