Hey guys anyone have and experance with a detriot locker? I'm looking at making 700hp and was wondering if it would hold up. I dont really want to go to a spool unless I have too because it will be driven on the street (limited). Anyone racing 1/8 mile what gears are you using? Thoughts?
Lockers will hold up on the street, but probably not very well with slicks on the strip. Spools are for strip, lockers/posis for street. That being said, I just keep my 2.79 gears in the turbomav for street driving (open diff) and I have a complete 8" centersection already to go with a minispool and 3.55 gears in case I see a need to put on the slicks and go racing. yes, I run 1/8 and 1000' with my other car, using 4.57 gears. Could stand 5.13's for 1/8 mi, though.
Ok... here goes a can of worms!! Lockers are very strong BUT no one ever had in mind for them to hold up under the pressure of 700 ponys. What motor are you building that will make that kind of horse power? Now you must please keep in mind that FACTORY parts are made for factory cars, can anyone tell me a factory 700 Hp motor? If you plan on making that many horse's you will need just as many aftermarket parts in your drive train as you will have in your motor, they go hand in hand! When you do get your motor complete put it on a REAL dyno (not desk top) and then you can see how many REAL horses you have, the two dyno's that tell you the truth and nothing but the truth are either motor only or rear wheels. Ok I've had too many beers tonight and have really spoke what I think but as always this is only my 02. Take cake Terry
Okay guys, Here goes..... According to strange Engineering (Part # n1971), and ford Racing (part # M-4204-L31 ) I should have no trouble with the locker with that kind of horse power. The guy at ford racing tech support said I will have no problems with he locker and that HP...if fact he says it will handle alot more. Joe at Strange says "I have never seen anyone fail a 31 or 35 spline locker". Moser Engineering however says that I'm approching the limits of the locker. The motor that will produce 700 HP... Dart 302 block stroked to 347 forged crank, rods pistons Victor Jr heads ported. Full roller valve train Dynamic c4 tranny and a small shot..(jk) of NOS (est 250hp).
not that I'm any kind of nascar fan, but I've been told that they run lockers in many of those, and they have the hp your talking about.....lots of things fail on their cars,.but not usually the rears?.just my thoughts
I have seen lots of bracket cars with lockers running up to around 10.50 s with no problems . Then again none of those cars would be making 700 horsepower either . You may or may not realize how much horse power 700 is but if you had a car that weighed around 3000 pounds with that much horse power ,and of course it hooked, you would be running well into the mid nine seconds . It is true about the roundy round NASCAR guys . They do run a locker or an after market version of them .
If you ever have a chance to have your car or motor dyno'ed be ready for a big hole to form in your stomach! The numbers that Mavaholic posted for his dyno were very sweet for a small block ford motor. Building a SBF to produce 400hp is a costly task! Now here a question? Can everyone who as had the car or motor dyno'ed please post the results. If you have a small block pushing 500hp WITHOUT the bottle you have a F$&king monster in your car and you could be close to 700 with a bottle. Desk top dyno only shows you what combo's might work best together and gives you some kind of idea what HP you may get. If you do a search with dyno as your key word you will see that even some very well bulid engines won't come close to 700 HP. All I can say is they is NO replacement for displacement and the dyno's bring you back to the hard cold world of reality. Good luck in you quest for 700hp, and I honestly hope when you find it you will share with everyone how you did it. As always just my 02!!! Terry Gates AKA Bossmav
lock her up 700HP, not a problem, gee NASCAR runs them and does have a problem. Axles are the problem, go bigger, connect Mark williams and they'll get the honest info for you. And don't forget the wheel studs have to be up graded. U joints also. And you can forget about a "stock" factory drive shaft too. Car weight will factor it, just ain't that easy of question for a generic answer.
Re: lock her up Ricky, Thanks for the advise, I agree everything in the drivetrain has/will be upgraded. I'm just starting in the back and working my way forward. I plan on upgrading everything. The last thing I want to have happen is get her finished and then break something... it gets done when it gets done, but it's going to get done (hopefully) right the first time.
Re: lock her up I have been told and someone please correct me if I am wrong. Aside from going to a 31/33 spline axle. I heard that the axles in a ford 8 inch are actually bigger(thicker) than what a factory 9 inch comes out with.
As far as gears go.... I had 4.56's in them then switched to 4.86. On the old motor there was only a difference of about 350 rpm. I have not ran the 4.86 with the new stuff.
Re: As far as gears go.... I was thinking I would start with those (4.56) and if I have to tweak later I can... Wanna part with those 4.56's???
