924Board.org

Raize · Joined: 18 Sep 2013 Posts: 455 Location: Scotland

Hi folks!

I wanted to post this question here as it's the most active 924 site.
As a 924 owner, I am incredibly cheap and stingy. Too stingy to pay for a dyno to find out how much power my 924 can make.

However, I have thought of a solution to this issue!
We just need to compare the speed of our cars.

Now, 0-60 is a poor way to measure this, as it requires power shifting and will wreck our drivetrains. It's also dependent on driver skill.

Top speed is also a poor way to measure this, as we could lose our licenses.

In-gear acceleration? Much better.
So the test I propose:

1. Drive at 30mph on a flat road in 3rd gear.
2. Count how many seconds it takes to accelerate to 60mph after flooring it.

Then, using this statistic, we can know how roughly how much of the original 125hp we have by comparing to other people's cars, and considering the person with the fastest time as having 125hp.

I tested this driving home tonight, and got 7 seconds consistently.

924-76 · Joined: 05 Jun 2006 Posts: 1489 Location: Ontario, Canada

Factor to consider that will influence the results:
-Tranny type, 4 or 5 speed as gear ratio will be different
-924 years/version, 95hp, 110hp, 115hp or 125hp
-Total weight of the car with driver and fluid (fuel)
-Tire outside diameter
_________________
1976 924 N/A ROW SOLD
1980 931S
1981 931 Part car RIP

CorsePerVita · Joined: 25 Jul 2008 Posts: 1992 Location: Redmond, Oregon

Only way to get a 924 over 100mph.

- Pull 924 onto cargo crate
- Pack on airplane
- Get to 50,000ft
- Push cargo crate out of plane
- 924 will travel at terminal velocity. New 924 speed record.

_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS

Cedric · Joined: 27 Aug 2004 Posts: 2835 Location: Sweden

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

scm924s · Joined: 22 Oct 2010 Posts: 296 Location: Gloucester UK

Totally unreasonable to compare the US emission strangled 924 with the euro spec version anyway!

Your car would have given 125BHP out of the box, but age and years of debatable maintenance would mean a few horses will have run to the hills!
_________________
1984 n/a Ruby Red Metallic
1988 924S Guards red- sold
1986 924S Guards Red - sold
1984 n/a Black - sold
1980 n/a Le Mans#1 - sold
1980 n/a Le Mans#2- sold
1977 Martini - sold

!tom · Posted: Fri Sep 20, 2013 1:57 am Post subject:

I tried to find what looked like a flat section of road on my way to work.

Two pulls, both around 10.5 seconds.

RPM range for 30 - 60 MPH: 2300 - 4600 RPM.

Lots of variables here!

205-55-R16's too.
_________________
78 924 NA
5-lug

pmcaya2 · Joined: 24 Nov 2005 Posts: 191 Location: Scio, NY USA

I've always found my 924 to have a peaky engine - it likes rpms. I hate driving in town with 30mph speed limit since it bogs down in third below 30, so I try to run 35mph. Going from a steady 30 to 60 is relatively slow until you get on the torque curve. I can go from 0-60mph in around 10sec without doing anything special. Don't be afraid of getting on the power (torque) curve.

Raize · Joined: 18 Sep 2013 Posts: 455 Location: Scotland

I think including the "less powerful" portion of the torque curve gives a good indication of the health of the engine. Certainly according to the user manual the 924 should pull roughly the same from 2000 to 5500 rpm (the curve is VERY flat) so I'm not sure our engines are meant to be peaky (although mine is as well, only picks up after 3000 rpm).

Still getting approx 7 second runs on flat road, with the original 14" wheels, 5spd manual, 125 supposed bhp, no extra weight. Still seems unreasonably long given that user manual states a 9.6 second 0-60.

ThomasJoseph315 · Guest

I would like to know if there are physical mechanical differences of the valve or compression of the early American 924's such as what I have Vs. the rest of the n/a 924s.

fiat22turbo · Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR

The earliest cars had more compression and made 125hp, like the Euro cars. That was only the 76 cars I believe. The 77 and later US cars had 95hp cars due to changes in emissions.

I thought I read somewhere that there was a change in valve size from the earliest cars to the later ones? I know there are some differences in the CIS system and the electrical system.

There's more info in the 924.org site in year by year break down and which years received which engines and how to tell the difference externally.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)