How fast will your SC go???
 

Who can give me actual numbers from their *stock* SC 1978/79 (any SC would be good but I think the 80/83 cars are a bit faster IIRC) on MPH and each gear at redline?

The 1980 C&D review gave 37 mph in 1st, 65/2nd, 94/3rd, 118/4th all at 6300rpm and 130mph @ 5650rpm.

I just had a tune up and oil change on my '79. Here is what I got this morning @ 6300rpm 37, 66, 97, 122, and then hit 132 @ around 5600 but I was a little busy and running out of road to push it further. But at least the car was still pulling now and willing to give me more when I shut down. Before the tune up 130mph only came in a tailwind and a 5 mile straight :) 129 was the actual top end and it would not pull 5600rpm.

Adding SSIs and a Danske d/t sport muffler next. Any feed back on what this will do over all.

The speeds you listed for your run this afternoon sound just about right.. I do not know about fellas taking (stock) SC's and running 145 and so on.. sound like they need to caliberate the SPEEDO! cuz thats FAST for a SC.. I think your about right on with your speeds.

Eric

Here are the charts from the manual:

http://forums.pelicanparts.com/uploads/911scgears1.jpg

http://forums.pelicanparts.com/uploads/911scgears2.jpg

The top speed is limited by drag/power rather than gearing. The gearing is good for ~150 at rev limiter in 5th, but I doubt you would get there.

Neither my speedo nor my tach are accurate.

Tom

Thanks Eric. I read another thread where most were saying 130 was way to light for an SC. So I just had to check for myself. I figure I'll be doing good to top 140 as is and suspect it won't make it.

Thanks Tom for the charts. Any one done 140 or better in their stock SC??

My '78 had SSIs, rest stock sans normal upgrades.
This car, in widebody form, ran 140mph every time I took it out. The speedo was dead nuts on due to the tire hieght. I had both the speedo and the tach calibrated.

My gearing must not be the same as yours. Do you have a 7:31 ratio? Mine is the stock 8:31. This gave 44mph @ 6000rpm in first. The car had no problem pulling a tick over 140mph @ 6300 rpm in fifth gear.

Best I have done in 1st is 40mph wound tight at 63/6400rpm. Just shy of that is a little more honest I think for my car.

My gearing is the stock 8:31 via my original owners manual. Sounds like the SSIs aren't hurting you. I'll know the difference soon on that point I guess. Love to hear what anyone else is getting. Looks like there is hope for 140+. Thanks guys!

How Fast?
 

Not sure about the intermediate gears, but about 110 in 4th gear
just slightly below redline. Just checked the spedo/odometer. The spedo seems to be right on and the odo is about 1/10 of a mile fast in 10 miles.

'80 911SC coupe
Fred Cook

There has never been a question in my mind that my car will achieve its mathematical top speed. It will not run out of power now, nor would it have before I installed the cams. At 125 mph, it still pulls strong, always has. My rev limiter kicks in at an indicated 7000 rpm, so I'm guessing 150 mph is thinkable. I'm certain of being able to get into the 140's. I've heard 137 for top speed on these things and I've heard 145. I've heard people report running out of power in an SC, but I think folks whose engines are tuned properly seem to have no trouble.

I had my 1979 SC up to 130 and it was still pulling. I ran out of clear freeway and was way out of my comfort zone. The car felt very secure at that speed. I've read that the Porsche speedo's read, very much, on the high side :)

<IMG SRC="http://www.pelicanparts.com/ultimate/image_uploads/P-Car5.jpg">

SmileWavy

Right now my SC will not go very fast. In fact I don't believe there is a slower SC anywhere in the world. :(

That should change very shortly.:D

http://forums.pelicanparts.com/uploads/No-engine.jpg

Moses our cars have the same rear view, nota in the compartment, but boy are they gonna get something, Kevin
sc trying to be a 964

Easy enough to check the speedos with a stopwatch.
120mph is a mile in 30 sec:)

US '78 and '79 SCs have 8.5:1 compression, '80s 9.3:1, late Euro cars are doing 9.8:1 compression and a added 24 hp. That is gonna make a difference 130+ mph.

But no question the state of tune does make a big difference. Ceratainly did in my car. Finding a place to run a SC out, even on the track (you need a couple miles of straight with my car) is hard to do.

I haven't had the chance to run higher than 120mph, but I do notice a vibration above 80mph. Is this normal? Is an increase in vibration normal at higher speeds? It feels like wheel balance vibration. So do you notice any increase in vibration at the steering wheel as you go faster than 80, 100, 120 mph?

Rock solid ride. No vibration ever.

One good point - my engine was a Euro. There is always argument of how much power that little word added. I can tell you that every mechanic that drove the car commented on how strong it ran. She now has a new home in the bay of a '77 911 in New York.

"Is an increase in vibration normal at higher speeds?"

Nope....as the man said, "rock solid"...enough so that it begs to be driven faster :eek:

Well when my 78 wasn't in pieces (restoration time baby!) it pulled very hard to redline. I had it over 130 mph and it was still pulling, my dad had it over 140 and it was still pulling so....

Of course at 70 things start to get smooth, over 80 everything get evens out and over 90 the wind noise dies down, the road becomes smoother, bumps disappear and I swear the car smiles.... :D

I figure mine will do 140, unless I go off track onto the grass, then it will speed up to 150 :rolleyes:

Highway patrol man here....I am giving all of you tickets!!!!!



ok, kidding, but could you imagine if they could!!!

Opps...wasn't me! It's fake! ;) :) ;)
http://forums.pelicanparts.com/uploads/hoppsan.jpg

That's roughly...errr...'lemme dig out my aicraft engine books...178mph...and electrical supercharger was running all the way ;-)

(If you wonder if car was taking a bend or something the answer is no...pic is taken after they changed front strut, so steering wheel was out of whack)

P.S. I don't recomend doing this...front end feels light and steering is very nervous indeed.

I got clocked (and ticketed by Florida's finest) at 156 with the 3.2. I could pull 6300 with the 3.0. According to a friend who drives a Henessey Viper, he stayed with me up to approx 145 and then pulled away.

I don't really trust neither Dodge's speedos or Police radar but, there you have my 2 cents (actually it was much more and a visit to the county court....)

Forgot this thread...thanks for the reminder :) With a good tune by the crew at Walter Gerber's shop, a set of SSIs, and a Danke sport muffler it took less of a straight to hit 135-140mph fairly easily. I was little busy (don't these people knwo what a Interstate is really for :rolleyes: so I couldn't actually tell you exactly how fast I was going but I had not hit the rev limiter yet.

I think you guys need a 993;)

And I bet you have a particular 993 in mind huh Brian?? Better stick with my SC. It'll do the 130 pretty easy and that's plenty for me.

Hmm...so how fast is that N/A 993 then?
;)

more than a top speed rush i enjoy the feeling when you come into a corner hot, applying brakes you feel the ace end get light. then just as you hit the throttle application point (apex for you track guys) still feeling a little lose (must have this loose feeling even then) , then you summons a bunch throttle and the way a 911 sits down in back, hooks up and propells you into the next turn is the best. sorry about the run on sentence, i was revisiting a drive in my mind from last weekend. i now will go clean my shorts off and have a smoke.

I'm close, and actually have a better hp/torque to weight ratio. I actually had a little fun with a 97/98 S last weekend through a couple of gears and ended up pulling away from it.

I stick with the factory specs on the motor and gearing and say 165mph.

I have seen 137 with much, much more available. I have to admit I ran out of guts at this point. The car is very stable at this point, in fact the only thing that made me back off at this speed was knowing how fast I was going. These cars are extremly stable, I am sure this includes all 911's.

I think top speed is 170's, correct me if I am wrong. I will never see though.:cool:

Hey fella's, K911sc.. he's not kidding.. I was there trying to keep up with this guy.. If any of you Bay Area guys enjoy frisky twisties Go out and hang with K911sc.. Man that was a blast... we did about 140 miles for the day 100 miles of those nuttin but curves and sweeps..

Jorge (Targa Dude):cool:

We had a 996 on the track yesterday in the rain. He wasn't running away in leaps and bounds from anyone in a 911 even the 25 year old ones. I am sure the top end is there but how you get to it through the corners is what makes a 911 fun.

Nice cars and I would love to own a 993 but for the difference in 40 or 50K, a well sorted out SC or old Carrera has to be the best value in fun quota per dollar of all the Porshes available.

Now add an extra 100hp or so to that 25 year old car and I suspect it would turn the tables on any plain jain 993 or 99.

I have taken my car with stock the 3.0, SSI's and a Danske 2 to 1 up to 130 mph with more possible before running out of straight track. That's plenty fast enough for me and I'd hate to get pulled over for it.

New shocks and wheel balance and I'm hittin' 140 mph - no problem. The rev's are about 6000 rpm, though.

I had my stock 85 up to 130 on a nice empty straight road last summer...and there was a lot left in her.....felt rock solid and wanting more...but thats all I felt like doing at the time...

Many years ago.
 

79SC

At redline in 5th gear it was still pulling and speed was over 145mph. This was stock, before the SSIs.

Looking back, that was not too smart of me. There are two many things outside your control on regular highways; potholes, tire retread, animals, you name it.

I'll save speed for the track now. The funny thing is the car still follows the rpm/speed curve so there's no reason to think it couldn't still do it and it's 24 years old.

I know this is outside of the original year range, but I have had my '88 at redline in 5th which should be about 150 if you do the math (speedo read higher). It was still climbing (slowly), but I ran out of room. 145 once with the top off but the windows up, that's noisy, I thought the back window was going to pop at any minute, but I think with the windows up the wind into the car is much, much less than with them down.

You dont even know how much I appreciate this chart being posted, thank youhttp://forums.pelicanparts.com/uploads/911scgears1.jpg http://www.pelicanparts.com/support/smileys/wat3.gif http://www.pelicanparts.com/support/...s/beerchug.gif http://www.pelicanparts.com/support/smileys/clap.gif http://www.pelicanparts.com/support/...s/boldblue.gif http://www.pelicanparts.com/support/...boldyellow.gif

I pulled 118 mph @ 5200 RPM, but ran out of open freeway to continue.

http://forums.pelicanparts.com/uploads/p-122.jpg

Just off on a wild tangent here. Anyone know how fast an early car with a 3.2 will go? (I am too scared to find out):D

I think this "how fast thing" isn't so important in older 911's. Most of time answer is "fast enough"...especially in 930 which is "too fast for it's own good" in my opinion. It isn't exactly comfortable to dart straight @ 170+ mph in tail-heavy car with very direct steering and lot's of camber/toe-in.

Won't a Targa go 156? I read that somewhere? (Just trying to get a thread going that's been sitting over 11 years).

I've played with the 130 mark, windows down and top off, it gets a little interesting...on a road in Mexico.

To be honest I wasn't taking note of exact rpm, but the car was pulling hard when I lifted. Having done north of 150 before in other cars, other than rev limiter, I don't see how it couldn't have gotten there or very close.