Air regulator valve

[78 280zcar]

Yeah, I found it it is on EF-32 in the FSM .

[280~Master]

78 280Z CAR,

your air regulator has 2 hoses on it under one of them is the connection if this is loose its probly the problem. Mine would just pull out of the regulator housing. This should be sealed tight on to the regulator. If its loose you probly need a new one. I found a used one it was more cost effective.

Good Luck,

John

[78 280zcar]

The connection is not loose at all. There is voltage going to it. I think it is stuck closed. I took it off and tried it plugged in while it was cold but it would stay closed. Is'nt it suppose to be open while the car is cold?

Also, I drove it home teday and the speedometer said I was going 70 but my mother in law told me I was only going 60. I just did a auto to 5 speed swap do I have the wrong speedo gear and what color gear do I need for the five speed? Thanks, Shane

[DatsunZsRule]

Yep, that test is originally from my FSM (1977)

Only way I can answer your speedometer question is to know which differential you got? It doesn't matter which year Z trans. you have. (77-83) The speedometer is metered by the cog on the end of the speedo cable that threads into the transmission and is paired with the differential only.

[78 280zcar]

I have an R-180 diffy. That is what I meant was the cog that hooks up inside the tranny from the cable. I didnt explain it good enough, my bad.

[DatsunZsRule]

So you have the original diff. correct? Gear ratio 3.36?

If so then you will need the 16 tooth cog

[78 280zcar]

Someone told me I might have a 4:11 rear end, but other than that I dont really know. Arent the cogs all color coded like green, white etc.

[DatsunZsRule]

Usually they are the yellow. Still count each tooth to make certain.

If you have a R180 then you don't have a 4.11

[78 280zcar]

I used the cog that was already in the 5 speed, when I got it from pick and pull I just left the cog in there. It seems to run at a normal speed range when I am driving around in the city. It is just when I am on the freeway that it revs or is at a different speed. I will check the cog that I have in there tomorrow and find out what is going on. Thanks datsunzsrule. Its pretty funny though I thought I was going to fast because of the rebuilt engine I was trying to break in and I was actually going slower.

I Just found out that the engine has a hard time starting at first after it is already hot. :paranoid: .

Shane

[DatsunZsRule]

There ya go you have the wrong cog then. Most r180 3.36 (on 280Z's) were used on Automatic models and you left the cog in the tranny from the donor car which means you have a 17 tooth or possibly a 19 tooth for the 3.9

What 5 speed tranny did you get? 77-80 or 81-83

aahh, hard time starting at first after it is already hot huh? that pretty much tells me right there it's the thermotime switch like mine. Still don't hurt to test it if you want to make sure

Glad to help as always

[sblake01]

Actually the 5spds are 77-79, 80, and 81-83. Check out this chart. It will also help with rear end types and ratios.

http://geocities.com/Z_design_studio

[DatsunZsRule]

My understanding was that Datsun used 3 different types of 5 speeds For U.S. Z Cars

One from 77 -80 Wide ratio

One from 81-83 Close ratio

and a borg Warner T5 in 1983 ZX's