The 993 uses Motronic 2.10.1 which is an updated version of the 964 unit
the big advantage is the hot wire MAF sensor over the 964 barndoor MAF sensor

yes you could rewire the pin outs and connections of the 964 harness not sure how the MAF plugs differ
Here is a pin out map showing the '94-95 non vram and '96-98 RoW vram
http://forums.pelicanparts.com/uploa...1424904188.jpg

there are only 2 differences between non vram and vram pin1 & pin 32
on US cars pin 2 & pin 54 are connected on RoW they are left open this just affects the stock maps and the central informer messages you also nee a chip change the chip for vram activates pin1 & 32 differently

all in all it's a lot easier to use a 993 harness, there is only 1 55pin version it has all the connections for both vram and non vram you just choose the ones you are using

I mapped some of the tip pin outs but they didn't particularly concern me

The 993 struts use a 14mm and a 12mm bolt to connect the wheel carrier the 964 use 2x 12mm bolts this would have to be addressed

So I just need to buy 2X14mm bolts & I'm off to the races? Sounds too easy!

The same goes for the 94 turbo. It uses the 14mm and 12mm bolts.

Hello

I have owned a 930 for years and become a custom to adjusting AFR's and keeping her running at its best, In the past I have owned a 88 Carrera and Very simple to work on also.

I just bought a 97 993 OBDII car, there seems to have alot going on in the engine compartment, Should of i stayed with a OBDI car ? It looks like a steep learning curve , Any tips on what to look for that can go bad? Wiring , vacuum connections and so on ?

There is no doubt that OBD1 is easier to deal w/ but it's a bit late for you to do much about it.

The biggest issue is SAI which tends to get clogged ports as mileage accrues, The OBD2 system then throws a CEL,which you can safely ignore until it's time for state inspection where the CEL code will cause the car to fail to pass. You can read all about SAI in another sticky.

next on the list of possible issues is chiping the car for performance gains, If you want to do that it will be more expensive and must be done by a competent shop, Steve Weiner @ Rennsport Systems can help in this area.

964 front bumper
 

..

This is the auxiliary(second) oil cooler kit used on 993 Cup and RSR, it also fits all 964 models

This one is sandwiched w/ the AC condenser on the left side of the car


http://forums.pelicanparts.com/uploa...1498414625.jpg

http://forums.pelicanparts.com/uploa...1498414625.jpg

Stock lines
http://forums.pelicanparts.com/uploa...1498414625.jpg

W/ secondary lines installed
http://forums.pelicanparts.com/uploa...1498414625.jpg


lines run down and across the front
http://forums.pelicanparts.com/uploa...1498414625.jpg

second cooler sanwiched betweeen AC condenser and stock fan
http://forums.pelicanparts.com/uploa...1498414625.jpg

final connections
http://forums.pelicanparts.com/uploa...1498414625.jpg


Alternatively a stock cooler can be installed on the left but plumbing is more difficult

These are stock coolers, the I/O ports on top make the installation more difficult toi plumb
http://forums.pelicanparts.com/uploa...1498415124.jpg
http://forums.pelicanparts.com/uploa...1498415124.jpg

Air cooled aero summary
http://forums.pelicanparts.com/uploa...1498920237.gif

I have Polished Aluminum wheels,17". whas that a stock item?

No, the most common 993 wheel is the cup 2, 7x17 & 9x17


http://forums.pelicanparts.com/uploa...1521065316.jpg
http://forums.pelicanparts.com/uploa...1521065316.jpg

I think you mean Cup II's but we know what you meant.

Bill

Not having the time to read all this, I bought the 993 C2, because I have the Carrera and SC. Meaning I have the true 911, but the 964 looks like a 911 body, but under is major changes over the 911.

The coil over shocks I never liked, but needed a new model for AC that works, so the 993.
I would love to add a 964 C2 but prices are stupid thanks to Singer.

I do see the exhaust and rear end a better improvement with the 993 over the 964, but both models seem so complex compared to my SC and not crazy about the PS system.

Let me tell you something. I owned a 964. I bought it back in 2011, when they were cheaper than a new Honda Accord. I bought it because I could not afford a 993 at the time. I was never impressed with it, both stylistically and performance wise. It looked heavy, felt slow and never put a smile on my face like my future 997 and current 993 does. If you want a visceral feeling 911, buy an SC or 3.2. Because the 964 is more closely akin to the 993 than the torsion bar suspension cars. I absolutely love my 993. It is so much faster than my old 964, and still has the aircooled feel. It is also so much better looking, and absolutely blows the 964's performance.

You must have had a rather poor 964. I have had them and driven them all. They are all good but I would never trade my 964 for a 993 or go back to torsion bar cars. To each their own. Your 993 might feel much faster but in actuality they are rather close.

Here is a stock 993vram dyno tested (dotted lines) on a mustang dyno vs a 964 (solid) with a chip. Sorry for the poor picture but it makes the point. Is the 993 faster? maybe but not noticeably. The peeks from the vram are what give that feeling. Well modified both are great cars.

They all have their quirks.

http://forums.pelicanparts.com/uploa...1540295543.JPG

The torque curve for the vram looks awfully anemic
Here are some that I've seen
http://forums.pelicanparts.com/uploa...1540336549.gif

Gearing and tires have a big influence too, the 964 /03 is particularly nice in 3rd

Any car can be made raw, I have a heavily modded '76 911 and a heavily modded '95 993, the 993 is much more direct and brutal. Both are a ball to drive.

Just added a 964 that I had years ago, it was hampered by ssi headers, but down only ~10 lb-ft peak. All are rear wheel torque in lb-ft
http://forums.pelicanparts.com/uploa...1540339861.gif

Mustang or dynojet?

All were done on one of 3 Dyna-Pack chassis dynos

I have found the mustang isn't as kind as the dyna-pack's or dynojets.