G-tech fun. What's a 0-60 on 81 SC?

[Superman]

I should get a stopwatch so I can objectively measure whether performance upgrades actually make the car faster. But I would not choose 0-60 as the measure. I'd choose something like 80 to 110 in fourth gear. Or 60-95 in third. Something that will isolate the engine's performance, away from clutch, tranny and tire variables.

[dd74]

I believe the reason the early SC is faster than the later one might be attributed to larger intakes and head-bore size, giving it a slight edge at the top end. And possibly a lighter car overall.

Did anyone notice that the early SC was also a Targa, which is always heavier than a coupe?

Was there a notable weight increase between the early SC and later SC?

And if so, where did it occur? Was it in the body? The chassis, etc? Anyone know?

[74-911]

Originally posted by brawlins
dd74 -
What kind of car do you have? I enjoy 0-60 stats.

Side question: My speedometer is a bit fast - I think I'm probably closer to 50 than 60 when the speedometer says 60. Would the G-Tech (or similar device) also reflect an inaccurate reading in this case?

I also wonder if this is a common thing to have a fast speedometer on a 911?

If you are running different sized tires than originally equipped with, your speedometer may be noticably off. My 74 911 came with 185 70's, I am currently running 195 60's which have over 5% less circumference than the 70's which will make the speedometer fast by approx. 5%.

[aigel]

Originally posted by coolbreeze
I really like the way the SC feels in the turns.

The G tech will also measure sideways G force if you go to a skid pad! Unfortunately, there is no skidpad looking piece of road that I could use here. I doubt it would be long until the cops showed up if I chose any school or other public parking lot. I will have to wait until the next AX school and take the G-tech to the skidpad. I will report what I can do. Would be neat to get numbers to compare between street tires and stickies.

George

[aigel]

Yep. The extra weight on the later cars was all bolt on stuff. Power windows, a/c etc.

I am unsure about the 'more power' of the earlier 3.0? Where do you get that info? The later engine had higher compression and dropped the air pump. The bentley manual lists "engine specs."as follows:

78-79 930/04 930/06 comp.=8.5:1, hp= 172@5500, torque=189@4200
1980 930/07 comp.=8.5:1, hp= 172@5500, torque=189@4200
81-83 930/16 comp.=9.3:1, hp= 180@5500, torque=189@4200

I think if there is a difference in power, it is marginal. As far as I am concerned, higher compression is always better and there is a few other reasons to prefer the 81-83....

George

[dd74]

Well, one of the "few other reasons" to like the later SC engine, particularly the '83 is it had the same block as the turbo though I don't know if it was the 3.0 turbo or 3.3. My guess is it's the 3.3 turbo, since they were contemporaries of each other at that time. Nonetheless, it was a stronger block, I believe.

George - you're correct about the horsepower, so all things being relatively equal, it seems the lightness of the early SC over the later is the reason for the difference in acceleration to 60 mph. But then, we're only talking about a half second, and also a measurement of the car that, in all honesty, is not its strongest suit.

There's a 2.7 porting thread going on right now, that has some good insight into the 3.0 from John (jluetjen). It's a good read if you/anyone is interested.

[banjomike]

During the 80s I remember reading an article in Car and Driver that explained the various steps they took to control for variables like temperature etc. I don't remember the details except that after that I was more likely to belive that a Car and Driver figure was repeatable and defensible. I also remember that Motor Trend tended to have wildly varying numbers. There are so many variables to account for. Air temp, tire temp, alignment, tire compound, how agressive is the launch, how fast is the shift...

I guess my point is, I would put too much stock in published acceleration or handling numbers. I also wouldn't put too much stock in G Tech numbers (though I bought one for myself, and one as a gift). Can't wait to try mine out! (I got .78gs braking on the freeway offramp yesterday)

[Sonic dB]

If you search on G Tech on Yahoo...the first site that pops up advertises them for something like $49. Think this is the real thing?

[aigel]

The basic model sells for that price indeed. I think it became so affordable after the new models are out. The basic model has been around in that form for at least 5 years.

Cheers, George