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Welded Diff Qís

Old 09-06-2018, 12:06 AM
  #1  
Rhaneline
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Default Welded Diff Qís

Yes yes yes i know this topic is covered everywhere but i have a few questions i just canít seem to find an answer for. I live in WA and iím confident in my driving skills iíve owned my Z for over a year and half now. If i weld the diff i plan to get solid bushings in the rear
1) How bad is it over 40mph? people say they make noises but i think thatís a myth or depends on the weld cause iíve driven my friend e36 m3 with a welded and i got it up to 60-70 and he drives that thing at 100+ all the time and there isnít any noises
2) Is it bad/unsafe to drive a welded at 100mph or over?iím no speed demon but we have some nice highways in WA where i can get going, will the welded diff stop me from going fast?
sorry again i know these are stupid questions but i donít have the coin for a lsd and most people say 2-ways and welded are the same but most prefer the welded. anything helps.
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Old 09-06-2018, 06:28 AM
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For starters, if you're driving at 100+ MPH on public roads, you're an idiot. Second, there's a wonderful racetrack in your state called Pacific Raceway (formerly Seattle International Raceway) that you should be taking your Z to. You'll go WAY faster, for a longer time, and without endangering anyone else.Third, while you're showing off your drifting skills at (any) racetrack with a welded diff, it's only a question of when you'll lose it and crunch a concrete wall when it gets wet. That's a serious drawback in a state that gets plenty of rainfall all the time.
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Old 09-06-2018, 06:40 AM
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balla on a budget


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Old 09-06-2018, 07:04 AM
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You have been considering this since 12/2017 . . . .

My Ford F150 has an electric Dif lock . . . . and my Yamaha Grizzly has a rear dif. lock always.

I strongly suggest you drive a vehicle with 100% diff. lock (that is on all the time) when it is raining, on a curvy road, and even in parking lots, where tight cornering is necessary. You will quickly conclude that this is NOT a good idea.
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Old 09-06-2018, 10:20 AM
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Originally Posted by dkmura View Post
For starters, if you're driving at 100+ MPH on public roads, you're an idiot. Second, there's a wonderful racetrack in your state called Pacific Raceway (formerly Seattle International Raceway) that you should be taking your Z to. You'll go WAY faster, for a longer time, and without endangering anyone else.Third, while you're showing off your drifting skills at (any) racetrack with a welded diff, it's only a question of when you'll lose it and crunch a concrete wall when it gets wet. That's a serious drawback in a state that gets plenty of rainfall all the time.
soooooooo street tunning a car is for idiots? everyone who does highway pulls are idiots? anyone with a fast car who likes to drive it fast is an idiot? woah i didnít know that.. and since itís a serious ďdrawbackĒ in a rainy state. what would someone use other than a 1.5 way? an open diff or a 2 way which is pretty much welded and doesnít unlock unless a tire goes in the air and thatís only the quaife...
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Old 09-06-2018, 10:21 AM
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My stock VSLD works very well. 145k miles.
Maybe I'm lucky?
Both tires will spin on take off/2nd gear roll. MT-90 fluid.

I couldn't imagine having the tires chirp on every turn. That would get annoying quick
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Old 09-06-2018, 10:22 AM
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Originally Posted by travlee View Post
balla on a budget

Just wanna have a fun daily and pockets that arenít starving. 2k for a diff without install and everything is a pretty penny but solid bushings and welding the diff is under 500
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Old 09-06-2018, 10:24 AM
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Originally Posted by iideadeyeii View Post
My stock VSLD works very well. 145k miles.
Maybe I'm lucky?
Both tires will spin on take off/2nd gear roll. MT-90 fluid.

I couldn't imagine having the tires chirp on every turn. That would get annoying quick
Tire chirp is nothing, this comes from someone with a lightweight flywheel that has chatter, when you know what the sound is you donít worry about it. now if your diff was open and the tires were chirping iíd think iíd be worried but not annoyed
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Old 09-06-2018, 10:26 AM
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Originally Posted by JCat View Post
You have been considering this since 12/2017 . . . .

My Ford F150 has an electric Dif lock . . . . and my Yamaha Grizzly has a rear dif. lock always.

I strongly suggest you drive a vehicle with 100% diff. lock (that is on all the time) when it is raining, on a curvy road, and even in parking lots, where tight cornering is necessary. You will quickly conclude that this is NOT a good idea.
a year and a half would be 03/17 but yes, i have a base model so an open diff, i was going to make the upgrade to kaaz but everyone says a 2-way and a welded are the same. 1.5 way is way out of the budget. It hasnít rained recently in washington so itís hard to test and especially when i donít own a car with a locked diff
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Old 09-06-2018, 06:20 PM
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Originally Posted by Rhaneline View Post
soooooooo street tunning a car is for idiots? everyone who does highway pulls are idiots? anyone with a fast car who likes to drive it fast is an idiot? woah i didnít know that.. and since itís a serious ďdrawbackĒ in a rainy state. what would someone use other than a 1.5 way? an open diff or a 2 way which is pretty much welded and doesnít unlock unless a tire goes in the air and thatís only the quaife...
If you're serious about tuning, there's always dynos to rent and do it right. But highway pulls and street racing seriously jeopardize the safety of innocent bystanders. It happens all the time and has been a factor in many Z33 shunts around the country. You also IGNORED the suggestion to take it to a proper racetrack and learn to drive consistently fast. For someone who stated in his opening thread that "anything helps" as far as advice goes, you're way too sensitive.

If it helps, I've raced a Nissan GT5 semi-tube car with a welded rear diff for many years, so I have experience. It put down the power well on a dry racetrack with Goodyear slicks, but always had the drawback of understeer on corner entry and snap oversteer from the apex to corner exit. Fast hands and a slow right foot helped, but was still not as quick as a properly setup LSD. For the street, it's like a snake in a box: tiring to stay on top of, but you don't want it getting out in the middle of a turn.
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Old 09-06-2018, 06:33 PM
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Originally Posted by dkmura View Post
If you're serious about tuning, there's always dynos to rent and do it right. But highway pulls and street racing seriously jeopardize the safety of innocent bystanders. It happens all the time and has been a factor in many Z33 shunts around the country. You also IGNORED the suggestion to take it to a proper racetrack and learn to drive consistently fast. For someone who stated in his opening thread that "anything helps" as far as advice goes, you're way too sensitive.

If it helps, I've raced a Nissan GT5 semi-tube car with a welded rear diff for many years, so I have experience. It put down the power well on a dry racetrack with Goodyear slicks, but always had the drawback of understeer on corner entry and snap oversteer from the apex to corner exit. Fast hands and a slow right foot helped, but was still not as quick as a properly setup LSD. For the street, it's like a snake in a box: tiring to stay on top of, but you don't want it getting out in the middle of a turn.
i wasnít ignoring the fact of taking it to a track and racing it but iíve been racing go-karts most of life. Iím not worried about my weaknesses as a driver iím more worried about mechanical failures at that speed. Being a victim of a family member killed in a high speed crash i can tell you i donít do idiotic things to endanger anyoneís life or mine. As i said money is a key factor in a lot of builds and you seem to disregard how much a dynamo cost per session and an entry and fees into a race track and finding the time off work to correlate something like that is a little unreasonable. Thank you for the knowledge, i simply wanted experiences more than anything. understeer in corners and snap over exiting. thank you.
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Old 09-06-2018, 07:28 PM
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Welding diff won't make you understeer. It'll make you over steer and will drive worse at high speeds than stock. Solid diff bushings won't make it louder if you have a stock flywheel / stock trans mount bushing
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Old 10-19-2018, 09:55 AM
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Default Not so bad

I've daily driven my welded diff for about a year and it's not so bad. The tires make a little bit of noise on slow and tight turns, but it doesn't "chirp". I still get some pretty good traction if I take a turn pretty fast, the rear doesn't kick out like most people say it would. Driving in the rain is a little unnerving when I go to work, but I just go a little slower and avoid deep puddles and the edge of the roads. I take the highway to work fyi. I have BFGoodrich sport comps in the rears as well. You could do what I did at first and buy a spare open and have it welded, if you don't like it then swap it out and sell it. If you do, then you have a spare to build. I drift my Z monthly at the local track, do highway pulls every now and then and some spirited back roads driving as well.
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