RenaissanceMan Posted February 23, 2009 Share Posted February 23, 2009 NEXT STOP WELD SHOP!!! (btw this is a 2wd 5sp) Link to comment Share on other sites More sharing options...
88RxTuner Posted February 23, 2009 Share Posted February 23, 2009 "What should I NOT be doing with a subaru trans?" "(btw this is a 2wd 5sp)" Ummmmmmmm.... You should be NOT driving in 2wd! Seriously, tho.. Clutch drops, Burnouts, full throttle transitions from dirt to pavement, etc... lol Anything that shock-loads your trans. <<I speak from experience...:-\ 88RxTuner Link to comment Share on other sites More sharing options...
TeamCF Posted February 23, 2009 Share Posted February 23, 2009 So I take it you are welding up the front diff? ... it's gonna turn awesome....... Link to comment Share on other sites More sharing options...
RenaissanceMan Posted February 23, 2009 Author Share Posted February 23, 2009 Sorry, I should mention this is for a dirt track car and someone who is determined to stay in the Fwd class. LOL, believe me I am scared myself. I can imagine CVs will go as frequently as oil changes. Link to comment Share on other sites More sharing options...
mudduck Posted February 23, 2009 Share Posted February 23, 2009 So I take it you are welding up the front diff? ... it's gonna turn awesome....... I hope you don't have to turn much. Link to comment Share on other sites More sharing options...
bheinen74 Posted February 23, 2009 Share Posted February 23, 2009 if its on dirt, wouldnt turning just throw clods of dirt instead of eating axles. or would it literally eat axles due to the bind. I would think the tires would loose bite and throw dirt before the axles..... Link to comment Share on other sites More sharing options...
Phizinza Posted February 24, 2009 Share Posted February 24, 2009 Fun Link to comment Share on other sites More sharing options...
Scott in Bellingham Posted February 24, 2009 Share Posted February 24, 2009 would like to see the results Link to comment Share on other sites More sharing options...
abog Posted February 24, 2009 Share Posted February 24, 2009 I wonder if welding the diff is going to cause the car to push really badly in the turns? Might be better if you could figure out some kind of lsd rather than welded solid. Link to comment Share on other sites More sharing options...
Psyko Posted February 24, 2009 Share Posted February 24, 2009 Might be better if you could figure out some kind of lsd rather than welded solid. I'll throw this thread out there. Front LSD would cost, but shouldn't be a "hard" thing to do. http://www.ultimatesubaru.org/forum/showthread.php?t=49241 Link to comment Share on other sites More sharing options...
Loyale 2.7 Turbo Posted February 24, 2009 Share Posted February 24, 2009 Please, excuse my ignorance... but let me Ask: What is the Idea / Purposses of a Welded Diff and what are the Advantages? I Believe it is intended for Off Road use, isn`t it? Link to comment Share on other sites More sharing options...
hatchsub Posted February 24, 2009 Share Posted February 24, 2009 Yup purely for offroad use. Its useless on road. Its basically a poor mans LSD...but never lets go lol. Hes planning on dirt track racing with it though so road manners are the last thing on his mind. Keep us informed. Sounds like fun. Link to comment Share on other sites More sharing options...
GeneralDisorder Posted February 24, 2009 Share Posted February 24, 2009 I really don't think that will work well. The inside tire will not slow at all in a turn so you will be pulled straight off the course....unless it's straight line drag racing in dirt... But I've never tried it so who knows - maybe in dirt it won't matter so much. I would expect the handling to be very unpredictable - based mostly on how hard or soft the dirt is on any particular day. Welding is great for slow speed crawling and mudding, etc. It's not really a good choice for racing though. Lockers are one thing but you can easily turn them off. GD Link to comment Share on other sites More sharing options...
abog Posted February 24, 2009 Share Posted February 24, 2009 right, locking the front wheels will cause the car to want to go straight under acceleration. If this were rear wheel drive it would work better because you can pitch the car sideways easier. I dont think that there is enough rear adjustment to overcome the pushing tendency. I will admit that all my dirt track experience is in rear drive cars, but I do have pavement racing experience in front drives. Lsd will give you better forward drive while still allowing you to turn in under power. You would have to slow way down to turn in with no front diff, and while you should be able to accelerate hard out of a turn I dont think you would overcome the slower entry speed. I am interested to see how this would work in actual application not just in theory. Link to comment Share on other sites More sharing options...
SOOBOUTLAW Posted February 24, 2009 Share Posted February 24, 2009 Weld away and make a video:grin:! Link to comment Share on other sites More sharing options...
Uberoo Posted February 24, 2009 Share Posted February 24, 2009 if the axles hold up keep your foot in it all the time.it understeers like no other when you let off,It will have very good turn in however when on the gas.Turns have to be taken a little differently.Come in like you are doing a scandinavian flick,flick the car where you want it to go and try to smash the pedal through the floor.You might have to experiement abit with that to get the right amount of flick. Link to comment Share on other sites More sharing options...
RenaissanceMan Posted February 24, 2009 Author Share Posted February 24, 2009 From what I have been reading, as long as the gears are welded properly (which they will be) then results have been good. The whole thing about "flicking" the car I can totally agree on. Its not that big of an investment so far and its worth trying to see how it performs. There is a race on March 8th that the car will be in from what I understand. Plans are to have the "race" trans in by then. Btw, I was just thinking it would eat CVs cause I know the guy is going to want to sneak it onto the asphalt every once in a while. I'll post results when I have them, on dirt and on tarmac. Link to comment Share on other sites More sharing options...
bheinen74 Posted February 24, 2009 Share Posted February 24, 2009 vote make it locked front diff FWD but put the steering ability in the rear wheels.....yaya wooo ha Link to comment Share on other sites More sharing options...
nipper Posted February 24, 2009 Share Posted February 24, 2009 Dont wled the front diffs. This can make the car impossible to control even at low speeds on paved surfaces, and at some point the car will see paved ground. The front wheels have several jobs to do,m and there is no advantage even in dirt tracks to weld the fronts. Now if this was a 4wd I would say go ahead and weld the rears, as all they do is follow the front and you have some ability to control them. A welded front diff can make it very hard to steer the front wheels on anything except wet grass. nipper Link to comment Share on other sites More sharing options...
thecarman Posted February 24, 2009 Share Posted February 24, 2009 At our last RallyX event a guy had welded the front diff on a Nissan Sentra. He said it sucked on pavement, wouldn't turn at all (he tried it just to see what would happen, but it is an off-road-only car that he trailers to races). I watched him in the dirt, and it definitely turned. The FWD cars use the e-brake a lot in turning. (But has this Sub been converted to rear-wheel parking brake?) He said he had to re-learn how to drive it, but it was working. We'll see how he does in the FWD class at the next race in March... Is this Sub an oval track car? If so, they are set up way differently, with tire stagger, so that they always want to turn left (taller tire on right-side). I used to help a friend campaign a VERY successful 4-cyl Fox Mustang at several different tracks. When set up right, the car would turn itself - you had to work to hold it straight when you were on the straights. I would imagine with staggered front tires and on dirt, it would turn left well with the welded front diff. I'm interested to hear what happens. Link to comment Share on other sites More sharing options...
RenaissanceMan Posted February 27, 2009 Author Share Posted February 27, 2009 Got the diff back from the welder today. Looks excellent. For anyone who is interested in the metallurgy of it all... Internals were cleaned with laquer thinner. (not the bearings, thats why they look ugly) using a torch the spider gears were preheated to about 700 degrees. Each joint at a time We discussed the alloy the gears were most likely made of, and decided upon TIG welding, with a filler metal that was a medium high carbon (similar to some tool steels), but with a little bit of nickel and copper alloying for greater ductility. Post-welding was just general insulation for a slow cool rate (normalizing the welds). The theory is that the bearings and stub shafts didn't reach transition temperature. I'll see how they look after I clean them up. If I question the bearings then I'll put on new ones. Link to comment Share on other sites More sharing options...
RenaissanceMan Posted April 6, 2009 Author Share Posted April 6, 2009 Hey guys, just wanted to give an update on this project. Got the trans resealed and installed. drives awesome!! Going around turns definately requires more HP from the engine, but with a little practice it gets to be second nature to get the back end to swing around. Traction is amazing. If only I can get the engine to run right then we are set (modded the ea82T to fit a TDO4 & 3" downpipe) I will post video hopefully later this week Link to comment Share on other sites More sharing options...
Psyko Posted April 6, 2009 Share Posted April 6, 2009 You have been fully informed that EA82Ts like to eat themselves, right? Make sure your cooling system is as rock solid as those welds. Other than that, it looks like a blast. Link to comment Share on other sites More sharing options...
Twitch de la Brat Posted April 6, 2009 Share Posted April 6, 2009 Sweet! And nice job on the convertablization... That's a job I would be proud of (if I had done it :-p) Sweet ride man, enjoy! Twitch Link to comment Share on other sites More sharing options...
Gloyale Posted April 7, 2009 Share Posted April 7, 2009 The theory is that the bearings and stub shafts didn't reach transition temperature. I'll see how they look after I clean them up. If I question the bearings then I'll put on new ones. I would have removed the stubs first then welded just the spider gear contact faces. That way you avoid heating them at all, and you can replace them if they break. You have now welded in the stubs into the diff. if you do break one, you will have to replace that whole diff unit, including having the new one welded. Sweet project. I'd love to take it for a few laps in the dirt. looks fun as hell. Link to comment Share on other sites More sharing options...
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