the nismo finned diff cover from z1 fits a vlsd pumpkin. ( I upgraded to nismo finned when I put in my Quaife)

I'm sure Phunk's would be better, but there is a good (100 buck or so if I remember) option.

Direct bolt on no mods needed.

Nismo Differential Cover

yeah if you just want the added fins, sure just get the nismo cover, but phunk is talking having added ports for diff cooler setup and higher capacity

ya i had one of those on my 350. i cant remember if its on the US spec nismo cars or jap ones or what. Its meant to go with the entire filled differential casing... but people add them to normal diff casing and get the very tail end of the fins. there is a normal nissan part number for that.

i have one on my 370, its a nice unit, and the fins are better then nothing, but im still going to setup a diff cooler

tonight we put the diff cover in the CNC to get exact locations for the bolt holes, etc.

After programming the locations into CAD, we played around. We have 2 drains, and 2 fills at the stock height. While there is added displacement, until we measure the stock cover (from fill plug down), i cannot compare.

This is totally open for suggestion. This was just the preliminary results of messing around, and I am sure the part will change a lot before we machine it.

So, looking for feedback on this!

Got some mild cooling fin work there... theres not much airflow in this location but even those fins more than doubles the radiant surface area in the location.

Some of the radius are unrealistic to machine in, and the thing might look a little more boxy before its said and done.

Anyways... some of the first steps have been taken!

I know I said I would post a new thread yet... but I guess I am not ready to take on a ton of attention for this right now. I would rather have a more solid footing.

Hey that's pretty awesome :)

Honestly, I think if you're focused on the market of people using clutched LSDs, they're pretty much all going to put in a diff cooler eventually, at which point the fins are just minor "nice-to-have" things. A little extra capacity and having the extra ports to drain/fill without disconnecting the cooler setup is a win, and I actually like the blocky look.

I guess some kits/controllers will have a temp sensor that wants to screw into a tapped port on the diff, may as well add another plugged hole for that option?

agree with him !

but the last sentence...

Ive seen a few different thread pattern sensor on a various temperature kits/controllers that it would suck if its wasn't the right one!

about 75% (49 out of 63 total) of every sender unit sold by summitracing use the 3/8-18 NPT as a reference...

I love it. The boxy look is nice. Represents business and it obvious someone will know something is going on back there.

Phunk gets things done. Take notes all you other business owners.

Oh ya totally forgot about the temp sensor port. I'll get that on there. Also, I didn't forgot the ABS sensor flanges.. Just didn't draw them yet!

Too many holes for Phunk to handle lollll

Very nice. Do you have a ball park figure on price?

I'm in...Pm the first batch price please.

That is a really good question. This project will have a lot of material removal compared to what I am generally used to.

My software is telling me that I am starting with a 24lb block of aluminum, and making it 3.5-4lb. So thats about 20lbs of aluminum shavings I have to make per piece.

I have to balance the realistic value of the item too. This part does not make power, it does not increase performance, you can hardly even see it when installed. Yet, if one guy walked in my door and asked me to make just one of these custom for him, it would probably be $1200 with reverse engineering and CAD work and all.

I could take a stock cover, machine off the lower half except keep the flange, and weld in a billet section with all the added features, and it could be quite a bit cheaper.

What would you guys say if I asked $450 for the full billet cover? I have seen a place that makes them for DSM/EVO etc and they go for $400, for a much more flat/simple cover applications (much easier to machine).

For $450, make one up for me.

This thread needs to be split so we don't distract from your excellent Road Race Fuel Pump.

I'm not sold on the value of making a new diff cover. I think the Nismo version is sufficient. Are extra bungs really going to make that much of a difference? Diff cooler setups work fine with the stock bungs. It's easy enough to add a T if you want a temp sensor.

Sure, I would pay a 25% premium over the Nismo cover for a nicer version; maybe even 50%, but that doesn't even get us to $200. And it's a pretty small market to compete against an existing part.

Or look at the Grand-Am teams. They have a much much larger budget and they have not seen a need for this. Love your stuff phunk, but I don't think this one is worth your effort.