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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 C4S 6 speed manual ratios
Reported or suspected cause
boss 302 in 1969
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
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Reported cause
I grew up before rev limiters were even used...the first car to ever have it was the Boss 302 in 1969.
Leading evidence: 'boss 302 in 1969' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'boss 302 in 1969' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check linked list' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Performed · outcome unconfirmed
EDIT: changed short/tall terminology, which confused me, to ratio, which doesn't.
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Performed · outcome unconfirmed
I grew up before rev limiters were even used...the first car to ever have it was the Boss 302 in 1969.
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Suspected cause · Original poster
I couldn�t find it, but �C23� is probably the sunroof.
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Suggestion
Check the linked list to find the code for 996.1 C2's optioned with PSM.
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Suggestion
But if you happen to find your preferences differ greatly from what Porsche intended ( which can happen a few extreme cases) , you will find that changing the ratio's will not be easy or inexpensive..
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Rennlist: 1 discussions
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I�m in the market for my first Porsche.
My budget would stretch to a base 981 Cayman. (Porsche, and all �Luxury� cars are very expensive in Australia)
This car seems to �fit the bill� pretty well, but the infamous �long gearing� is really putting me off. Driving my favorite mountain roads and never using higher than 2nd gear seems sub optimal. (Strict 62mph speed limits ruthlessly enforced makes speeds above this very risky)
I posted on the 981 forum, and got some useful info.
Looking at the local market I could get a 911. (A 911 !!!)
albeit 10+years older for similar money.
It will be a midlife crisis/lifelong dream/fun car, and the semi �Classic� status doesn�t worry me. I don�t need the most modern. I need something I love driving. Analogue is good.
My question: can anyone with experience with the manual car shed some light on the gearing.
What does 2nd top out at?
Without going much faster than 62mph on a winding mountain road would you use 3rd or 4th? I suspect the extra torque (3.6 v 2.7) would make shifting at lower rpm still �fun� and relevant.
Thanks for any info/opinions.
The 3.6 will get you to ~70-75 mph in 2nd gear. You will find 3rd gear for cruising at 62 mph and downshifting into 2nd at slower turns will be a blast. The 996 is a great canyon carver. Good luck with your hunt.
Thanks. Appreciate the help. I know a test drive is the sensible thing, but not easy to arrange. Suitable cars are few and far between, and often a plane ride away. I also wouldn�t feel right test driving someone�s car if I wasn�t serious about buying it. Hence the questions.
I doubt I�d be disappointed with any Porsche, but am keen to get the one I�ll enjoy the most.
All 996s have more of a touring gear spread in the trans for the autobaun. That being said it allows u to really wind out the low gears and stay in the > 5.5k rpm range. Add a decent exhaust and u will never turn on the radio.
zbomb gave the right answer.
Also, my limited experience is that most (manual anyway) cars are designed so that 2nd gear tops out slightly faster than 62mph (100kph).
Why? To get the best 0-60 (0-100) times for the spec sheet. Any higher ratio on 2nd and it would add another shift, slowing the time. Any lower ratio and it's not making the most use of the power band.
I've only researched gearing for a few cars, but it makes so much sense I'm tempted to believe it's almost universal.
However I'd love for someone knowledgeable of more cars to chime in and let me know if I'm wrong.
EDIT: changed short/tall terminology, which confused me, to ratio, which doesn't.
You will find the gear ratios on the 996 will match the engines power/torque curve very well, just as Porsche intended.
But if you happen to find your preferences differ greatly from what Porsche intended ( which can happen a few extreme cases) , you will find that changing the ratio's will not be easy or inexpensive..
To phrase and old saying...." The juice will not be worth the squeeze"...
Looks ok to me even using your data....your 2nd gear at 6975=68mph still has 225 RPM to go to redline.. so 225 RPM = 2.19 MPH, so 7200 RPM in 2nd gear = 70.19 MPH using your data which is in-line with ~70-75 MPH..no?
Also FWIW a true 70.19 MPH speed will read about 75 MPH on the factory Speedo, they are always about 4=5 mph high ( due to MFG laws )..
You aint running to 75MPH and as you can see from the data (GPS Speed), in a track scenario running to the very top of 2nd gear, couldn't manage to hit 70MPH even with the benefit of a taller tire. The reality is for the OP, you're going to comfortably run into the 60-65MPH range.
Your posted data of 6975 RPM = 68 mph , does not agree with your data graph showing 6995 rpm = 67.7 mph...which one is true data?
6975 rpm @ 68 mph also equals 70.19 mph @ 7200 rpm
6995 rpm @ 67.7 mph also equals 69.6 mph @ 7200 rpm...
Either one can be rounded off to 70MPH in 2nd gear @7200 rpm so no need in bickering... and they will show about 75 mph on the factory Speedo...
So the ~70-75 MPH in 2nd gear is true and OK with me...
To OP:
FYI, Porschetech3 and zbomb have a history here, and don't always play nice together. But, in cases like this, they also get into good technical discussions/debates for the benefit of the rest of us.
Skip - fine, if you want to say you can hit 75MPH whatever... YOU CAN"T, not 72, not 73, not 74 or 75. So, the response that was given was wrong, it will be wrong today, tomorrow and for the rest of eternity.
Can you hit 70 or 71 while bouncing it off the rev limiter, maybe - go tell the OP to do that so you and your boy can be kinda, a little bit right.
Hope the OP ends up with a car he likes.
LOL....that's what rev limiters are for....to show you the top of the range ..
I grew up before rev limiters were even used...the first car to ever have it was the Boss 302 in 1969.
Back then you would twist the engine until the you felt the power fall off and the shift would put you right back into the power band...no rev limiter needed, just don't miss a shift...
All - thanks for the time/effort replying.
My dream of “heel/toeing”* into some mountain bends seems a little closer.
(*After a LOT of practice - I’ve been more of a rider, than driver all my life. I race bikes. I fly helicopters to pay for bike racing.)
Third gear in my 99 with a redline of well over 7,000 is over 100mph.
You could leave the 911 in 3rd and be fine. The early 3.4 engines have the best torque above 4,200. The newer 3.6 engines can do great torque a bit lower, well into the 3�s.
The most fun given your scenario is heel/toe between 2nd and 3rd and keeping revs between 4-7k. Should be a blast!
Porsche people:
I have the following info on a car I�m interested in. Any info appreciated.
It�s a 2002 C4S with sunroof. Australian delivered. (According to the seller). From the vehicle id doc:
996 431
M9603-662 G9631-10
LC9Z AH
C23
X70
X97
X98
288
513
601
I believe the 3 digit codes are options?
As always. Thanks for any help.
Yes.
https://www.stuttcars.com/porsche-91...options-codes/
This one is more concise, but maybe more confusing:
https://p-car.com/technical/option.html
and LC9Z is the exterior paint code, AH is internal color.
M96.03 662 is general engine description
G9631 refers to the transmission
I'm sure someone else will remember; I've done it but can't remember in detail... There is also a dealer site online that you can send the VIN to and get a detailed build sheet PDF back. I don't think I learned too much new from that vs option code lookup, but it's an option. It was nice to have an official sheet for my car.
Wow. Great help!
Unfortunately, a pretty unexciting list. (Aluminium gear **** inserts, and SS door entry guards - with logo!�Xenon headlamps!)
I couldn�t find it, but �C23� is probably the sunroof.
Where there any �handling� options available on these cars. Shocks? The differential braking (Porsche Stability thingy)
C23 is country code for Australia.
M030 (030 on the sticker) would be sports suspension with lowering by 20mm (I believe).
X74 another Sport suspension with 25 or 30mm lowering, only available on 996.2. Not sure that was available to Australian market though.
PSM came standard on all AWD 996. Check the linked list to find the code for 996.1 C2's optioned with PSM. It came standard on 996.2 excluding the 996.2 gt3.
Sunroof has its own code but probably configured as part of the C23 specification.
If you get above mentioned pdf you'd see those market-typical options listed too.
M220 is mechanical LSD (22%/27% locking rates or something like that)
M222 is Traction Control (not to be mistaken for PSM) which is always accompanied by M224 ABD (see https://www.cars-data.com/en/technical-terms/abd-automatic-braking-differential.html)
This is a source reference. Confirm exact model applicability in the original material.
