blueovalz

I used the rear Maxima mounting brackets. The bolt pattern on these brackets did not fit the 280ZX (or Cressida) calipers, so I just drilled a new bolt pattern to match the calipers. The Maxima front calipers have a wider pattern than the ZX calipers, but the piston diameter and pad where equal or identical compared to the ZX calipers. So there was no advantage to the Maxima calipers (I think they even weigh a bit more than the ZX calipers did).

They had a wider bolt pattern, which is why I did not use them.

The mounting brackets are those "rare" Maxima bolt on types. I don't have the part number at this time, but it seems even Nissan has a hard time getting them any more. You could make your own too if you are so inclined. Yes, the rotors are the front Maxima rotors (same exact size as the front '84 300zx rotors). This set up works too well, unless you have monster brakes up front. To help the problem I installed an aftermarket proportioning valve, and then eventually swapped out the 280ZX front caliper for an '82 Toyota Cressida front caliper. The piston is 1/8" smaller diameter, and it has the same offset and bolt pattern as the ZX caliper, so it was a simple swap. This helped reduce the rear clamping force, but even with the 12" front rotors (bigger front brakes), the proportioning valve is still needed to reduce rear pressure. This set-up worked best when I had 2" wider tires on the back when it was being raced.

Here you go:

Now we're talking about a true dream machine here!!!!

With the front dam so low, and such a "dirty" underside, along with the mufflers and cell, and differential plate, I don't think it's going to see much air pressure against it, even at speed.

I've finally reached a point of personal satisfaction reference the rear of my Z. Only because of the prompting ,or better yet, prodding, from Eric (Sleek Z) and other members of this forum have I decided to complete what I started over 12 years ago, and that was to finally do SOMETHING about the rear of the car. It's not finished yet, but this will be pretty much the final design. A small set of vents or bisected grill between the exhaust rings will probably be the final touch. Never would have happened without this thread.

If I've got the concept correct, they are equal in "torque to pavement" because of the added leverage or torque from the rear gears, but at peak RPM, the high rev'r turns the tires faster than the low rev'r even with the 4.11 gears. So I'd say same torque, but faster around the track with the high rev'r. I don't have the issue of Circle Track, so the answer is ??????

If there were a lot of gear changes throughout the course, I'd go with the high rev'r. A fairly constant speed oval track would make me reconsider using the low rev'r. And the answer is?

Without getting under the steering column (I'm at work), and based on the photo in your post, I'd say the reservoirs would hit the steering column bracing and reinforcement. I would guess that the OEM pedal support would have to be removed, and that the steering column would then have to be supported by another means. A lot of work for what gain? It's nice and racy, but a brake proportioning valve and other tilton MC designs would work as well or better. Their bolt patterns are the same, or very close, as the Datsun MCs (I believe, because I've got their clutch MC on my firewall and it was a bolt-on arrangement except for the fluid line).

Is the inverse amp draw correct with DC motors though?. The reason I ask is that (so far) any and all experience I've had with DC motors is the voltage/current draw are proportional (permanent magnet), but not true with AC motors.

Storm clouds forming.

Sounds high to me too. I've got a homemade ram air set up on my 240SX (completely enclosed box with slightly protruding scoop on front of bumper) that provides an estimated 3-5% gain at highway passing speeds. The only comparison I have to give is that the car accelerates almost as quickly in 5th gear as it used to in 4th gear at the same highway (70+ mph) speeds.

I found that if you wait until June down here in Arkansas (to eliminat the pine pollen dust), that a pine top works just as well as a brush does.

Last but not least is the fact that if you depend on the ground effects for your grip and handling pleasure (street car), look out for the dip in the curve or typical uneven street roads surface. 200lbs of down force in the middle of a sweeping curve can turn to 0lbs in a split second, and with no where to go but your neighbors yard and tree. This is the biggest reason I don't even want to produce a full fledged "true" ground effects package (not to mention how hard it would be with the Z under side).

This still happens to me even with all levels correct. I have the center pivot floats, and wonder if the side pivot would be better in this case. Unfortunately, the side force handling is more important to me than this problem is. So I am interested in any responses too. My Carter AFB carbs do not do this though.

That's a hard question to answer. A lot of it depends on the ride height of the car. In general, the lower the car (or tub, undertray, pods, etc) the less angle needed for the same amount of lower pressure created. Double the ride height, and you may be able to increase the diffuser angle by 50%. Slats or vanes in the diffuser can also help in keeping the air flow smooth with even larger separation angles. Trial and error, which is why all the big teams use the wind tunnels.

My undertray is only an aesthetic touch to the rear of the car. With all the mufflers and fuel cell cluttering up the bottom of the rear valance panel, I felt compelled to clean it up a bit. Anyway, my understanding of the fences at the rear of the LeMans cars is to contain the diffuser at the rear of the undertray (or venturi) that extends the entire length of the bottom of the car. Without these fences, the carefully controlled increasing cross section of the diffuser would not allow the decrease in pressure at the rear and bottom, and hence, a loss of downforce would ensue (at this time any knowledgeable person on these devices can chime in). The turbulent region behind the Z (especially with a rear spoiler) will most likely still be there. With that said, the fences on your Z really do add a nice touch to it.

Tooooooo funny. Adding insult to injury, the pictures keep coming and coming. Too bad it took this string to finally see some great pictures of your car Pete. Very nice. I like.

Nice touch.

What I did was use a one way valve (I used a one man brake bleed that has been sitting around for years) to vent it to a length of fuel line down to the lower rear quarter panel. It's just a piece of aluminum with a hole through the middle, a spring and a check ball. It keeps the cell square (won't let it balloon like BLKMGK said), by venting out, but does not allow air back in except very slowly.

What I did was use a one way valve (I used a one man brake bleed that has been sitting around for years) to vent it to a length of fuel line down to the lower rear quarter panel. It's just a piece of aluminum with a hole through the middle, a spring and a check ball. It keeps the cell square (won't let it balloon like BLKMGK said), but allows air to be drawn back in.

Well 7 years down the tubes. Last night I got my first ticket in a long while. 45 in a 35 in my Pathfinder. I guess what really gripes me about this is law enforcement's quick answer to all the worlds automobile accidents, and that single, all evil word is SPEED. Masculine Bovine Feces!!!. Inattentive driving has a hell of a lot more to do with accidents than speeding ever has. Take the cell phone out of the car, and I wouldn't have to take corrective action to prevent an accident 2 times or more per week. But the first thing investigated in an accident is speed, not the dumb ass factor next to the cell phone. This is one reason I have little respect for these "tirades" that the highway patrol has when they occasionally saturate a single area with radar and cars for a 100% catch rate. BTW, my daughter will not have a radio, nor 2 back seats, in her car the first year of driving. Obviously, this is not directed toward anybody on this list and is done with the deepest respect for those who have served in the past.

You never know. This person may be living vicariously through this car, and his site may be the one single thing that he is capable of doing. He may not even have the capacity to know that what he is doing is questionable. The Internet has the simplicity to allow a wide spectrum of user capabilities to be "expressed" with little to no moral or conscientious capacity. Pete I'm sure, will handle it with the tact and reasoning this deserves.

I've enjoyed this exercise, or dare I say, oratory on the "character" of the changes (or potential for) in our civil liberties in this country. It is only an opinion, but I hope we tread very carefully forward as JA and many others determine what my future and the future of my childrens "natural" rights will be.