Ben280

T3 uses a significantly better strut (Koni's) vs the AZC mystery strut, so I'd let that drive my decision. I also have reservations about the AZC rear control arm, design, where if that crossbar slips, it can adjust all sorts of alignment specs. I haven't seen anyone do testing with the Apex Track Attack stuff, and I'm not sure if it's a dramatic improvement over a well sorted strut system. There are certainly theoretical improvements with a double A arm setup over the Z front end, but I'm not sure the percentage improvement. I'd be more excited about the track attack kit if it came with a modern front knuckle, rather than re-used the OEM spindle.

Sounds like Godzilla will be selling a custom driveshaft. Can't imagine that a stocker off the shelf will work with this arrangement.

If I didn't just do the Jerico swap in my car, I'd be rubbing my pennies together to make this swap happen!! Amazing work, love this solution. +1 for Godzilla Raceworks putting together a full kit.

I had one in my old Subaru autox car. They work alright, and are the ONLY viable option if you are really set on a 4 point harness. I found that unless you get the lap belts really tight, they will ride up when you tighten the shoulder straps. I only used mine to help hold me in the car while racing, otherwise they sat in the back. Knowing that these are a compromise of safety, I would question why you wanted to add them. Do you have race seats as well, or factory seats?

See what @JMortensen and @NewZed said about non-replaceable u-joints! (THANKS NISSAN!) The Nepaco piece is just what you need if you want a driveshaft made with the stronger 1310 style joints.

Looks like it's thinned out to save weight and be easier to install and not be inches thick, interfering with the control arm action. I imagine it has to be several pieces to accommodate chassis flexing over the years and being out of square. The steel plate appears to be 3/16"-1/4", the aluminum is probably close to 1/2". I guess looking at those photos, I'm not seeing the issue that you see. The diff isn't twisting in a way that it will break the thin side of the slot, and pulling the bolt head through the plate isn't going to happen. They've bushed the diff properly here so it's free to flex more or less independent of the "power cradle".

This is the steel plate cradle, their aluminum option is a billet piece that looks substantially thicker.

@AydinZ71 That Nismo diff looks good. Something with clutches will be far superior to a helical. OSG, KAAZ, or ATS are other good brands to look for. I recently had a custom driveshaft built. You probably want 1310 u-joints, and you'll need a Neapco N2-2-899-1 flange yoke for the long nose R200's.

Good write up! So long as you don't mess with the gears, it SHOULD be a simple job. Double checking the backlash is a great go/no-go check and to make sure you have the shims on the bearings in the same places. I would add that with the S13 "open" LSD you will need 12x bushings to get the long nose ring gear bolts to work with the LSD center section. I'm pretty sure the ring gear bolts in a 280zx R200 are 10mm, and the holes in the S13 LSD are 12mm. McMaster Carr or your local hardware store should get you sorted!

Pad compound and rotor size have very little impact on overall bias. They can be used to tune in brake feel, but it's within a few percent and at the end of the day, don't effect clamping force. At the end of the day you need to start with the correct piston stagger, which I'd hope T3 can figure out. A prop valve certainly would be a good addition, I won't dispute that. I do wish generally that these companies would tell you what calipers they use. Saying "Wilwood 4 piston" is about as useful as saying "New calipers" since Wilwood has so many caliper piston sizes within the models. The tools and calculators exist for people to figure this all out, but the companies need to give us the information. Anetcodaly we all know the rears see less pressure due to the factory prop valve, residual valve, drum cylinders etc, but does anyone have actual numbers?

Now that you mention the car, I do remember seeing photos in another thread here! I'll have to file your username away as one of the good ones I think a setup similar to mine (3.90 R200 from a 280z, S13 Kaaz 1.5 way and Wolf Creek CV's) will be good to get rolling and have the benefits of a LSD right out of the gate. Chromoly stub axles like @JMortensen mentioned will be a good upgrade, but not IMO strictly necessary for your first round of mods. The Subaru conversion has it's fans, but with how easy it is to find R200/S13 parts I think it's overrated.

Seattlejester makes a solid point about tires. I've broken u-joints in the factory shafts at 230ft-lbs on big ol sticky tires. Drag launches and clutch kicks are what break diff parts, so as long as you stay away from that, and lower than your 450ft lbs, the smaller diffs will be fine. 8.8/9.0 Ford diffs and R230's all require some level of fabrication to fit. The easy move here is to keep/get a R200 rear end, and put a LSD build for a s13 open diff in, and then buy the Wolf Creek CV's. That's my setup, and it's held up amazingly well. With this option, you don't have to source the Subaru to Datsun adapter stub shafts, or the increasingly annoying to find Subaru R180's. There are a couple threads on here about using the OBX helical diffs if you want a real cheap solution, but you can also just leave the factory diff alone, and add in a LSD later if you aren't sure you want one now. Some more info about your goals would be instructive here and we could give you a better answer!

It really depends on what you plan to do with the car. If you want to cruise around, enjoy some spirited back roads and don't want to break the bank, the R180 is probably the better of the two options. The factory stuff will work just fine unless you've swapped the motor. If you have a R200 now, you could just swap in a new LSD center section, do the Wolf Creek axles and have a pretty reasonable setup.

Unless you're doing track/road race with a lot of weight or HP, 6 piston/13" rotors are way overkill, doubly so if you still have drum rears. 6 piston fronts usually allow for more pad area, more even pad wear and provide the proper balance for a 4 piston rear caliper. A 13" rotor will give you marginally better stopping torque, but also dramatically increases the price of the rotors you'll be replacing. Without knowing which of the FSL4R calipers T3 is selling in this kit, it's premature to assume you'd need a prop valve. The smallest size Wilwood caliper would be about in line and allow the factory fronts to be used. Factory front piston area is ~3.1in^2, and the smallest FSL4R is 1.98in^2. A bit rear biased, but if you factor in the pressure drop by leaving all the stock drum plumbing in, they probably are a reasonable match. As @grannyknot said, you want to make sure you consider the entirety of the brake system. Just replacing the drum rears will result in a thoroughly sub optimal brake system.

Those little yellow labels mean somethin' serious is goin down! Looks great, always impressed by the quality of this build.

That's just what the Actor, Mark Rolston would say.....

Have you considered using a Krontec or similar style quick release with a connector in the center for steering wheel controls? I've got a nice curly cord on mine, and it's *fine* but I find it's often an annoying tether for my steering wheel.

https://www.blocklayer.com/rpm-gear.aspx This calculator is pretty helpful for getting the information you want. You'll need the ratio of the gears, the final drive in the car and the overall tire diameter. You can see where each gear redlines and where when you shift where the RPM's drop down to. In this chart, it seems to show the max speed of each gear, so to go from 2-6, you'd be redlining 2nd gear to get into 6th and not bog the motor. Since these are all factory gear boxes, the ratios will all feel about right. Biggest variance will likely be what rear end gear you go with. I'd go with whatever transmission is easier to source and install.

A 3 point belt is designed to allow you to move forward and then "catches" you. This same motion in a 4-6pt harness can result in a basal skull fracture, which is why race car drivers use a head and neck restraint device. 3 point belts also don't keep you in a fully upright position in a roll over, they'll let you slouch or submarine a little bit as the car deforms. A 5-6pt will hold you bolt upright, and then you'll be a couple inches shorter if the roof caves in. You are right tho, if you're rolling the car and hoping the seatbelt is gonna save you, bigger problems! I always thought it was a good "visual" of the restricted motion that comes with a racing harness compared to factory 3 points! Seatbelts in general are designed as part of a system, and a 3 point is designed with the safety system of the stock car in mind. 4 points in my opinion are worthless, and 5-6 points need to be used in conjunction with a helmet, head and neck restraint and roll cage, otherwise they will do more harm than good. I'd see if you can extend the latch so it sits inside the seat, then you'll just need to detach the low mount on the drivers side and pass that through the seat! Should be all set at that point.

If you slot the sides of the seat, just pass the factory belt through those new holes. A 4/5 point isn't really suitable for street use, they are designed as part of a system to hold you in a fixed position, and not rattle around the inside of a roll cage. If the car rolls and doesn't have a roll cage, you're held firmly in the seat while the roof comes in on you. Plenty of people run 4-5 points on the street, but if you have the option to not do that, stick with what you have!

Back to the DTC-30's this weekend and I was happy again. MUCH more affirmative brake feel compared to the HPS pad. A little brake drag on the way to the line and they were good to go. Got some more big upgrades planned, so doing some brake temp paint/strips is a good plan. This weekend was the SCCA National Tour stop at Packwood. Probably the last major event I'll go to this year, which is a real disappointment as we were planning to make a few trips to California, as well as Lincoln for the big show. Oh well. Car did well, by Sunday I had knocked off most of the rust from sitting around all year and a few of the bad habits learned at the track. Saturday was a mess and my mental state meant wasn't up to par, so I finished down in 6th for the weekend. Hope y'all enjoy this video from Sunday!

My DTC-30's for AX duty needed a little bit of dragging to feel inspiring in the first corner. But a lightweight car doesn't make warmup easy. Was looking at the PFC stuff the other day, good data point! Squeal isn't a worry for me, but it's good info for comparing manufacturer language against.

Sounds about perfect for what I'm after. The DTC's are ok, but wear like junk and are about as abrasive as 60 grit sandpaper. I've got Wilwood calipers front and rear, so a fairly common pad shape. Might look to upgrade as I start adding aero since I'm using rather small calipers. Only reason to upgrade there would be a thicker rotor, but I'm using a 12x.81" rotor up front. Rears are rather thin and after their visit to the track turned mostly blue haha!

I figure if I can get the car to feel really nice for 2-3 hot laps in a row, that's about all I need for a time trial type event. There's a fine line for me between going fast and burning the car down during a 20 minute session. I've tried Hawk Blacks, and they were pretty good, but I like the bite and modularity of the DTC-30s more. I might try the DTC-60's but I've also heard that Hawk has been left in the dust technology wise by other companies at this point, and the torque their pad compounds can put out just are nowhere near what other tech can do. Need to research this more, but I've heard enough to be interested. I'll note too that the Hawk Black brake dust is about the most corrosive thing I've ever seen. Don't even think about getting it wet or it will permanently bond and etch into aluminum.

Just cooked the pads and got some serious heat into the system. No brake cooling to speak of, which with wheels this small and wide is a real problem. The pedal felt alright, but the brake feel just didn't instill the confidence I wanted. I need to do some research and probably some testing to find something that I like. Water and Oil temps were a bigger problem, I could get about 3 hot laps before temps were too high.