5th gear options, Audi?

Arthropraxis wrote:Larger tire/wheel combinations can lower the RPM. Get some 24" spinners, you know you want to.

That would be an interesting setup.

kevin924kevin wrote:According to the info provided to me when i was at RH shop in vegas, the fifth gear swap should have the car at about 2300 RPM at 70 MPH based on 25" wheels etc. They say the swap will allow the car to run up to 181 MPH at 6000 RPM.

6,900 at 210 probably need about 800BHP

Hey Acorad, did you ever locate the 0.64 gearset?
I signed on the Audi forums to put a feeler out. I would like to be at 2200-2400 RPM on the freeway at 70

xschop wrote:Hey Acorad, did you ever locate the 0.64 gearset?
I signed on the Audi forums to put a feeler out. I would like to be at 2200-2400 RPM on the freeway at 70

No. The 0.64 was Europe only, afaik.

The 0.68 calculates out to about 2450 RPM at 75 mph for my setup, the 0.64 would be about 2300 RPM at 75 mph.

Let me know if you find the 0.64, I'd be interested in one too.

Were you the one who swapped out your 5th gear through the fender well? Love to hear a little more about that!

No, I swapped mine when I took out the NA and stuck in the 951 trans. But if you chop out the wheel well, the swap can be done without removing the trans. My sub wouldn't sound too great if I chopped out the bottom part of the sub-box.

I have 285-30-18 rear tires and am not sure If I can get 295-35-18 under there without rubbing the fenders. So I may get 285-35-18. I think 285-40-18 would be too big of a jump

Dunno, I have 265-35-18's.

So Ive been searching around here & I cant find any info on tops speeds per each gear. I thinking of doing a .73 5th gear swap into my 951 trans. low cruising RPM is important to me but I also know I dont want to top out in 4th at like 120mph and then shift into a too tall of a 5th gear and the engine comes down out of it power band. So heres my question: whats the top speed of the 951 trans in 4th gear with a 285/30/18-ish tire?
(ive already seen & read about the speeds in 5th that were posted)

Thanks,
Bryan

PM me with your e-mail address and I can forward you an Excel file that will give you speeds for each gear and tire diameter. It is set up so you input the gear tooth counts, R & P tooth count and tire size and engine RPM's. Then it makes a graph for each gear.

http://www.kabamus.com/garage/gears.html
TRY THIS ONE GUYS...

Pretty cool calculator, mine shows just about 215MPH at 7000RPM with the NA 5th gear in my turbo transaxle!

Here is my shot at the Excel chart, Turbo transmission with NA 5th gear, 17" wheels 225-45-R17 Tires.
Now to find somwhere to run 150 mph.

The Kabamus site gave the 5th gear speed at 5000 as 161.54 mph.

its fairly accurate... minus aerodynamic drag. it will get you close though.

Anybody got any further news about the Audi gearsets? Also is the N/A 5th gear swap still give you plenty of "around town torque"?

951, I'll be doing the 5th gear swap from the Audi diesel soon. I'll post up my results.

Sounds good. Where did you end up getting it from and what ended up being the cost of it? I know there were several numbers posted earlier in the thread. Just wondering in case I decide to do this instead of the N/A 5th.

951, it was either All Auto Recycling (719) 683-9600 or Jerry's Foriegn (408) 993-9711, both up in the NW somewhere. I believe the trans was 125 + about 75 for shipping.

Have to write those down on notepad. Thanks

0.68 5th gear from Audi diesel installed:

^^^^SWEETT^^^^

Punched in the numbers between the stock 0.83 5th gear and the NA 0.73 5th gear and it looks like the NA gear drops rpm by 400-500 rpm at the same cruising speeds.

At 3000 rpm with 285-30-18 tires with the 0.83 gear you're going 78.8mph, with the NA 0.73 you're going 89.6mph, which you don't really hit till you're at 3500 rpm with the 0.83.

With the diesel 0.68 5th gear you're going 96.18 mph at 3000 rpm, which is pretty much a 600-700 rpm drop over the stock 0.83 ratio.

I have easy access to the NA 5th gear because none of the Spec 944 racers want it, so I think I'm going to swap it in and see what I think. They all want my stock 0.83 5th, but I'm going to hang onto it in case I don't like the bigger hole between 4th and 5th the NA gear will create.

Ya, I agree. The 0.68 drops your rpms about 200 more than the 0.73. I'm going to hold on to my 951 0.83 also.

I'm going to hold on to the rest of my diesel trans with the idea that if the 951 trans I have now ever frags, maybe I can swap in the rest of the diesel gears. The diesel 1st gear is the same as the 951 (3.60), but all the rest are progressively taller.

Probably could just swap in the whole diesel trans if I put some thought into it...

Not been on Interstate yet, my 88 NA with a Turbo trans and NA 5th gear was showing 2500 rpm at 60 mph. Tires are 255-40 17"

Any updates on the Audi gear swap?

My Audi Diesel 0.68 5th is in and it fits and apparently works fine, although the trans is still out as I'm still in process of clutch, TT bearing, etc., etc...