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Old 10-15-2000, 04:49 PM   #1
N/A
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Post Attn Jay_UK, need diff help

Jay after you told me of the Pulsar GTI-R with the NOS I went and installed the old setup I had from the wife's Civic. It took a bunch of extra parts and help from a shop but I got it in there and everything ran great. Well I did need a better fuel pump but that's not important. Now I need to know how in the hell the guy kept his rear diff and axles from coming apart? I have now blown the second rear diff since getting the Pulsar. Last time I got one from a yard and had it hardened at the shop. I thought that would have been enough until yesterday. Everything went great until I was driving yesterday. I took off pretty hard, the car felt great so I kept at it, I put in the clutch, shifted to 3rd, let out clutch, hit gas, waited a second or two and hit the bottle and thins just went wrong. Very loud obvious bang and grinding noises, the car struggle badly and I pull over. I first thought the tranny had gone but got out and found that the rear diff was now leaking out fluid. So the car's back at the shop today. Is there anyways to keep the thing together with the added hp? How much is this thing built to take anyways? I haven't got it apart yet to see if there is more damage. Can you send me an email if possible so you can help me sort this mess out?
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Old 10-16-2000, 07:32 AM   #2
Jay_UK
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Ooops

I told ya not to run those 100bhp jets

Check ya mail...

J.
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Old 10-16-2000, 01:49 PM   #3
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I'll find out this afternoon what all broke. I need to find out if I can use the rear diff out of another model Nissan. Hopefully I can use a Silvia or Skyline since they seem to be pretty damn tough. I wonder how many of the turbo RS owners have had or are going to have this happen as well. Oh and I will look into getting something to more gently release the NOS so that I don't put extra stress on any new parts.
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Old 10-16-2000, 06:35 PM   #4
delectron
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I was planning on an upgrade to a KAAZ 1.5 way mechanical LSD in the rear after I hit 8 psi or above. Actually, I'll probably upgrade even earlier just because I'd rather have the lsd in back instead of the open diff. So, once I have the power to properly drive the KAAZ, and I have it, it's gonna go in.
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Old 10-17-2000, 03:55 AM   #5
Jay_UK
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Anyone need any quaife diffs ?

J.

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Old 10-17-2000, 04:40 AM   #6
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OK Jay, is it OK to just install new gears in the rear diff even if the inside of the diff looks like hell? It came apart really bad this time. It wasn't a matter of losing a few teeth this time. The whole rear end will likely have to come out. I didn't take the axles out to look at them since the diff was entertaining enough on its own tonight. I took a couple pics of the diff with an old camera (sorry no digital pics). The added torque from the NOS was definately pushing the car beyond the limits. I will look into something to regulate the NOS so that it doesn't come on all at once like it was setup for. I am curious if anybody knows if its better to heat treat parts or cryogenically freeze them to increase the strength? I am waiting to find out if I can use the rear end from another model Nissan. If so it will save me some time and trouble. I'll email you on the side to go into detail about the diff.
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Old 10-18-2000, 12:26 AM   #7
MattC
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Jay,
I am! That damn Open Diff just ain't cuttin it anymore. Throw me a PM.

MattC
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Old 10-18-2000, 01:22 AM   #8
Jay_UK
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Matt,

PM'ed you

J.
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Old 10-18-2000, 02:49 PM   #9
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Jay, I'm leaving the Nissan to sit in back of the shop for a while until I figure out what I want to do. If the diff is going to be a prepeated problem then I am not sure I want the pain in the ass to deal with. I'm also not looking to sink huge money into it when I have a already built up Galant I can drive until I get motivated to work on the Nissan. The rear diff looks like it was used in a old Buick Gran National. We nick named the car the Bomb. Made sense to us. The car is a great car with the hp to weight ratio and the AWD, ABS four wheel disc and everything but I have a feeling its at its limits right now. The only way to go further would be to sink alot of cash into it which I am not about to do on a car I will only have until I leave in May.
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Old 10-18-2000, 03:24 PM   #10
Jay_UK
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Greg,

I dont know of anyone who has blown their diffs.. upto now..

Normally it is the transmissions or engines that let go..

You dont know the history of the diff either...

I would suggest installing a better control system for the gas.. to gently introduce it.

I have seen a gtir on the rollers... when the gas came on, it would wheel spin!! They had to put two big (18+ stone) guys on the trunk (they just fit in the gap) to way it down...

Did u get my mail about the plate diff ?

J.
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Old 10-19-2000, 02:23 PM   #11
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Jay, I sent you an email about it a few minutes ago.
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