NZ951

What did it take to get there?

AJKOK1

About 12 seconds ? ...just kidding.

According to reviews at the time, the standing 1/4 mile time for the 964 C2 ( probably almost identical to the C4) was 13.5 secs, hitting 106 mph.

Given that was based on a stock 964 with 250 bhp, two passenges and a full tank of fuel, I would "guess" that to achieve 12.0, you would be looking at 1 passenger and approx 300 bhp. ( weight seems to play a major factor, so swapping out seats and any extras will certainly help) .

Now if at this point you want the scientific justification for such a claim, then i'm going to struggle, but it is based on feedback and some of the stats many guys provided with the Gtech performance meter that was shipped between many members some time ago.

I'm running 285 bhp on my C2 Targa...achieved via a Cat & Cup bypass, a remap ( and rebuild...although this is only valid if your engine is tired or leaking) and a l/w flywheel ( helps with pickup rather than actual BHP figures...but save a some weight)... i don't know my 1/4 mile time, but its certainly ahead of where it was when the car was stock.... so I would hazzard its in the 12 - 12.5 region.

I am sure their are some members who know their exact stats and will probably be able to provide a more "convincing" explanation.

here are the original stats taken from a magazine test in 1990 :-
http://www.porschepassion.com/964_car_review.gif

Al.

NZ951

I just cant see 285BHP 2WD netting a low 12. Also, I thought the C4 stock 1/4 was a low 14. To get into 12's in a C4 I would have thought at least 350-400BHP would be needed.

NZ951

PS I like the clear lenses...

Millemiglia

This does not answer your question, since it's not a C4 but a fellow clubmember (Porsche Club Sweden) got these times in a stock 964 RS.

402m, 12.85 sec@174 km/h
201m, 8.3x sec@138 km/h
60feet, 1.9x sec

I think you will have to do some serious mods and weight shedding to see 12 sec on the 1/4 mile in a C4...

AJKOK1

You could well be right, my thoughts are not particullary scientifci, but based more on perception.

I guess ( and again may be wrong) if you found a vehicle that could achive the 1/4 mile in 12 seconds, and you knew its power to weight ratio, assuming drag cooeficient etc, you could probably gauge a "fairly" comparable setup.

ie,

a 1991 3.3 turbo, weighed 3,000 lb's, and had 315 bhp, a ratio of 9.52lbs per HP.

a 1991 RS America, weighed, 2,760 lb's and had 250 bhp, a ratio of 11.17 lbs per HP.

a 1990 C2, weighed 3,031 lb's, and had 250 bhp, a ratio of 12.3 lbs per HP.

weight is obviously a factor, but for my C2, with the weight saving from the L/W flywheel, Primary bypass etc, and the few extra horses as previsouly explained, the stats would be :-

1990 C2, weight 3,001 lb's, 285 bhp = a ratio of 10.53 lbs per HP.

Quite a difference for only a few "small" changes, and better power to weight than an RS america...so I'm not convinced you would need 100's of extra horses to make such a big difference.

I picked up the figures above from the net, they look fairly accurate.

Al.

Christer

My opinion would be that a 1450kgs car would need 350+hp.....

Oddjob

I recall the road tests on the 94 911 Turbo 3.6 to be in the mid or even upper 12's with 355bhp. And I think the 993 Turbo was in the low 12's at best w/ 400bhp. Weight on the 993T was a couple hundred pounds higher. But to hit 12 flat, Im thinking you need to be in that power range, unless the car is really lightweight.

AJKOK1

Seems like my "very scientific calculations" have not convinced everyone...actually based on your comments, I'm not either anymore.

Guaging change in performance from behind the wheel is always going to be subject to more perception than substance.

I'm off this weekend to look for a very steep hill, a performance meter and a can opener to shed some weight.....

I think the point ( that I probably did not consider) is that the performance curve is not linear, so you can't simply assume the drop from 13.5 to 12 seconds is the same as getting from 20 - 18.5.... i think ?

tonytaylor

Mine ran a couple of 12.9x 1/4 miles some time back with the car at 300hp/265ftlbs and weighing stock weight. It's about 160kg/350bs lighter now so I guess mid to high 12s.

pete000

I think this one is in the 9's but it is a C2 and this is not Photo Shop.

NZ951

So how to get 350-400HP in a NA? Do many guys turbo? There was not a lot in the history about it. I want the 4WD to get off the line quicker! I know they are nto built for dragging, I just like it and do it 2-3 times a year.

AJKOK1

I know Ninemeister do a 360 bhp + supercharger kit for the 964, i bet they do a Turbo kit as well.

This is one link to them
http://www.9mracing.co.uk/html/modul...48&quickview=1

Colin 90 C2

I'm betting that to achieve 12 flat, you will need forced induction and around 450hp.
C4TT has/had a Promotive twin turbo mod and was achieving 650hp? Even with that power, I'm guessing no better than a low 11 e.t.

Doug H

I think mine did around 12.6 to 12.8 with about 290 to 300 hp (245 to the wheels) and a awesome torque curve that peaked at 242 to the wheels. I think it would be near impossible to run 12 flat with a NA unless it was totally stripped down weight wise. My car was not light weight by any means.