964 vs 993, a systems analysis

[cupomeat]

This is a fantastic thread and I've learned a huge amount so far, thanks.
A question on wheels, however.

The 18" rear Turbo 1 wheel comes in 40mm and 65mm offset.

993 362 140 00 with a 40mm offset
993 362 140 01 with a 65mm offset

The stock wheels for my 993 NB are 9” wide with a 55mm offset (993 362 128 00) SO,

Does anyone know which offset (wheel) should be used in a NB 993? I would assume the 65mm offset would push the wheel too far out, does this make sense?

Also, the N/A C4 comes with the electro hydraulic power brake booster similar to the 993tt.

[ilko]

The 55mm offset is for a 17x9 wheel. The 18" wheels you are looking at are 10" wide. For a NB you will need the 65mm offset wheels.

[vintage guy]

65mm offset is correct with 10" rear wheel on a NB 993.

[Captain Ahab Jr]

Sorry for the dumb question but could someone please explain the purpose of the smaller black plastic tank that sits on top of the main fuel tank.

Is it a fuel expansion tank or return tank and if it is why does the 964 need one where an earlier car on injection doesn't have one?

Originally Posted by Bill Verburg

993GT2 w/ black(appear to be steel) risers



'90 964 Cup


'90 RS/lw


964 Cup yr unknown


964 Cup yr unknown(it had the mg wheels though)


RoW Rs yr unk.

[Cupcar]

Tank is for fuel evaporative emissions control

[Bill Verburg]

These are works in progress and any errors that can be pointed out are appreciated
993 Specs


964 Specs

[Bill Verburg]

Another way of comparing some transmissions, both stock and regeared




and a comparison to some 964 5 spds

[AZ914]

Great thread Bill, thank you.

[Bill Verburg]

Some more aero comparisons

[Cupcar]

Not tested, but do you think a 964 RS America would have that 15#'s of lift at the rear the movable spoiler C2 does?

My bet it that the RSA with the tray spoiler has negative lift front and rear, making the RSA the best aero of the 911 series.

[Bill Verburg]

Originally Posted by Cupcar

Not tested, but do you think a 964 RS America would have that 15#'s of lift at the rear the movable spoiler C2 does?

My bet it that the RSA with the tray spoiler was negative lift front and rear, making the RSA the best aero of the 911 series.

I'm guessing that the RSA is going to be at least as good as the 964t, but haven't seen any data to back that up

an H-series 911 coupe w/ the early whale tail has f/r lift #s in pounds at 124mph 7/18

given the better front #s of the 964 I'd agree w/ you