Have you looked into changing out the ring and pinion? That would give you better gearing in all gears.

Mitch, what was the total cost to have rh do that? Calif motorsports charges in the area of 3k to 3.5k depending on time to freshen up the tranny but that does not include gears at about 1k a piece. Swapping just 5th gear is about 1k for the gear plus about 2 hours of labor if they only have the tranny and don't have to drop the motor...

Ring and Pinion...
 

My cost was north of 3.5M, but they went through the entire transaxle. Renegade sent it out to a well known Porsche racing shop. So I had a middle man, but at that point I was trying to work with Renegade since it was early in the project. The transaxle is buttery smooth. I love the gearing, with nearly 400 HP at the rear wheels I don't need to be smoking $300 tires from every stop sign.

Here's a gearing chart for my setup:

http://forums.pelicanparts.com/uploa...1410988675.jpg

I also have a question about tire size. I have stock rims/Fuchs with tires:

205/55R16 - I believe the rim to be 6.5 x 16
and
225/50R16 - I belive the rim to be 7 x 16

Is there a tire size that I should go with to give me a taller height which would lower my rpms at the same speed? How large can I comfortably go with these rims or is there a larger rim with certain tire size that will fit the narrow body 89 911 without any issues?

:)

just read this whole thread over the past two days....inspirational. Thanks for the great documentation and r&d.

Mitch, I spoke with them at Gbox. The R and P is approx. $3500 just for the part. Probably the same to install. However, they really do give great advise and I recommend them for taking the time to explain a lot of variables and solutions.

How many people changed gears or ring and pinions? Chime in here please!

Are they louder?

I almost went that way with my second 914 -- nearly bought a fresh 327 -- but decided it was "sacrilege" to take away the uber-character of the euro-engine, and that just hearing that flat-6 whine making music everywhere you go was too much to give up for a V-8. In the end I converted 2 914's to 914-6's by myself and was ecstatic with the results. Now, I drive a 74 911 that had a 3.0SC swapped in by the prior owner -- and I really feel that more power would just be more than I could enjoy in a daily driver. As is -- I reach 99mph so fast it's almost disappointing (they can arrest you for 100). If you really want the V-8 -- buy a 1975 or older so you're exempt from smog. Even the older ones can be "updated" inside & out to make it look however you want.

Final thought on gears. I am leaning in to swapping out my 5th gear only. You guys have all read why. I have rear tires that are 225/50R16 so I think that means that my circumference is 24.86" or say 25".

I like my gears except for highway and realize 1st is only good for my driveway so 2 thru 4th are my normal drive around gears. 5th needs to be tall to solve my issues. A G5050 5th gear is usually .767 with a final drive ration of 3.44. My G5001 has the same drive ratio but the 5th gear is .89

A comfortable driving rpm on the highway should be around 2500. At 3000 rpm my g5001 is at 73 MPH. With a G5050 5th gear it would be at 85 and with an aftermarket gear that will probably make some noise using a .656 gives me 99 MPM. Dropping down to 2000 RPM with a .656 gives me 69 MPH. That seems nice and quiet for the highway. 2500 is at 86 MPH with a switch out of my 5th to .656

I know the drop in noise from the rpm will be nice but will that be out weighed by the gear noise. I like the rpm drop more then what I see with the G5050. Let me know what you think. It is winter time - time to do a switch...

I have a tall 5th in my 914. Granted the tranny is out back and I don't know who made the gear RH supplied. I don't hear any annoying noise. I know that some aftermarket gears can be LOUD, I've had that experience with diff gears too. BUT, then you have the noise in all gears, not just 5th.

I like my RH 5th and its behind a 327. Pulls like a locomotive as the mph climbs faster than the tach with only 2100lbs :D

Erik @ GBox, when you get his attention, is a knowledgeable and nice guy. Sometimes I've had trouble of recently getting a response on my GT2 box from him.

Luke, can you find out what tall gear they put in? If it is a tall Porsche gear then their would be no additional noise. A tall Guard or Albins, I was told, makes some good noise. Is this true?

Just ordered a tall Guard 5th gear .667

I have given it a lot of thought as to whether to get the Ring and Pinion also (Albins 3.1). The spread of gained MPH and lower RPM was more pronounced in the higher RPM/MPH range. My goal was to lower rpm in the comfort area for cruising and the tall 5th seemed to be the answer. If money was not an issue I would have done both. For now just a tall 5th.

I also found a really nice online gear calculator:

Gear Ratio Calculator | Weddle Industries | High Performance Driveline Components for Race Vehicles | Off-Road Transaxles, Clutches, Gears

The gear set has arrived
 

Got my Christmas Present today...

http://forums.pelicanparts.com/uploa...1419612743.jpg

http://forums.pelicanparts.com/uploa...1419612818.jpg

Gear is in. Engine is going back in.
http://forums.pelicanparts.com/uploa...1420287695.jpg


http://forums.pelicanparts.com/uploa...1420287786.jpg

Took forever for RH to answer email. And then they didn't really give me an answer. Good progress! I may eventually try the CaymanS trans in my 914 to improve shifting from the tall 901.

Good luck with install. Nice pics

G50 01 Fifth Gear Swap
 

Here are some photos provided by Tom at Advanced Automotive of New Windsor. Hopefully someone can use the photos for their own swap if that helps...

http://forums.pelicanparts.com/uploa...1420496829.jpg

http://forums.pelicanparts.com/uploa...1420496847.jpg

http://forums.pelicanparts.com/uploa...1420496862.jpg

http://forums.pelicanparts.com/uploa...1420496881.jpg

http://forums.pelicanparts.com/uploa...1420496900.jpg

http://forums.pelicanparts.com/uploa...1420496911.jpg

http://forums.pelicanparts.com/uploa...1420496922.jpg

http://forums.pelicanparts.com/uploa...1420496938.jpg

http://forums.pelicanparts.com/uploa...1420496965.jpg

http://forums.pelicanparts.com/uploa...1420496983.jpg

One last photo

http://forums.pelicanparts.com/uploa...1420497107.jpg

Radiator Options
 

I'm not sure what you have decided about cooling but I am planning to use two of these for my ez30 conversion. One will fit behind my valence without cutting into the tub and the other behind the motor. I'll need to have the inlet/outlets enlarged but thats about it I hope. Any opinions on these?http://forums.pelicanparts.com/uploa...1420588676.jpg

You will need a certain amount of square inches. I think you will need a lot more then that to cool. What are their sizes? Can't wait to see some photos of where you are now with your car. What kind of horsepower will you see? I would love to see how you mount it in the rear. Are there any new photos of your build?

No new pics worth posting. Fuel system is recently finished and I made a bracket to hold the coil pack and FPR. I adapted a camaro fuse and relay panel to run my fuel pump etc but its been so long I've forgotten all the connections so it has to come out of the car so I can trace all the wires. This is certainly a learning experience. The heat exchangers are approx 26X7X3 so two of them approximate a stock radiator