924Board.org

Bumblebee77 · Joined: 09 May 2008 Posts: 372 Location: Brisbane

I'm a new 924 owner in Brisbane looking to squeeze a little extra out of my 1977 car. I guess first off is exactly what kind of performance can i expect to get out of this car? Are they expensive cars to play around with?

I'm just looking to tweak a few things first just to give my car a little more oomph and possibly even make it run a little smoother.

Any suggestions as to where or who to take my car to in Brisbane?

Thanks all.

fezza575m · Posted: Tue May 13, 2008 9:23 pm Post subject:

The best place for taking a Porsche to in brisbane is T & D automotive. Most likely a little bit more expensive as thats all they specialize in. Also i only hear the best things about the work they do.

Also by joining the Porsche club...you get discounts there too

_________________
Red 1977 Porsche 924 CGT...THE MORPH IS COMPLETE

leadfoot · Posted: Tue May 13, 2008 10:06 pm Post subject:

get a timing light and adjust the timing 10deg advance by turning the ignition distributor, that should give you about the best performance mod apart from lightening the car by 200kg or turboing...
Stuart
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Scorpio · Posted: Tue May 13, 2008 10:36 pm Post subject:

youre in brissi!, help me clean out my garage and learn all about installing a bae turbo into a NA924...

_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

Bumblebee77 · Joined: 09 May 2008 Posts: 372 Location: Brisbane

Yeah... what side of town you on? I don't get a lot of time off unfortunately tho... but would be keen to meet a few fellow 924-ers!

nicoflow · Joined: 12 May 2008 Posts: 13 Location: Ky USA

Air flow air flow air flow, up grade the throtle bodie, and steight pipe the exhaust if your local emission laws allow.
_________________
78 924
05 Scion xB
02 Monty SS
65 MGB

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

Check out AppleBit's website as well as the articles posted on his site for information on how to make more power with the 924 motor. You'll find that it isn't easy or cheap.

Basically:

Turbo or supercharging. If the air won't go in willingly, a little force is required.

Whether or not you run forced induction, have the head ported and run larger valves. This will make the biggest change for the least money in the long run.

Camshaft. Do your research as cams tend to make the power more peaky and can actually slow the car down if you're not careful.

Header and intake. MSDS and Stahl I think have made headers for the 924. Weber Side draft carbs (I'd use sidedraft throttle bodies myself w/EFI) or a custom manifold with a larger plenum and throttle body with EFI.

EFI with programmable ignition. MegaSquirt is a popular choice as it replaces the CIS system and allows the engine management to be tuned a little more accurately for your specific engine and parts choices. I know Wolf3d is another popular choice from Australia.

MegaSquirt also allows (since it is open for changes and additions) can be used to do more esoteric things like launch control or traction control, transmission control, etc.

A lightened flywheel will help the engine rev faster while it might be harder to get started from a stop light.

Increase the compression ratio and engine stroke. This option requires an engine rebuild and expensive custom parts. There were kits to increase the 2.0L motor to 2.2L with a custom crankshaft and connecting rods. Extra compression ratio will increae power output at the expense of gas mileage (you need more gas to help cool the combustion chamber and stave off pre-ignition) also extra compression is not always a good idea with a turbo or super charged engine.

From here, it is merely fine tuning things to make everything work together the best it can. Matching the shape of the ports between the head, intake, exhaust. Running lighter followers in the cylinder head. Using an adjustable camshaft to help fine tune the cam timing. Carefully choosing the heat-range of the spark plugs and their gaps to ensure maximum power output and efficiency. Of course keeping the coolant and oil systems in top shape is also important, so adding an oil cooler might be a good idea.

Good luck!
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

macBdog · Posted: Fri May 16, 2008 3:50 pm Post subject:

I hope you guys are planning on coming to the Brisbane 924 owners convention?

Its on the 22nd of June at Queensland Raceway.

All the cool guys are gonna be there in their awesome cars.
_________________
1979 931 with a 350 chev
1973 911E with EFI

fezza575m · Posted: Fri May 16, 2008 4:05 pm Post subject:

HAHA! thats the way! "Convention" i like your terminology

We will just have to hope that we are not outshined by the huge number of 997 GT3's in the club

So i expect FULL ATTENDENCE!!

_________________
Red 1977 Porsche 924 CGT...THE MORPH IS COMPLETE

AppleBit · Joined: 16 Nov 2002 Posts: 1516 Location: Minneapolis, MN

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

Ohy why do people always say the same things?

"Turbo or supercharge"

First off both of those done right are going to cost a ton of bucks and likely if not done perfectly are going to blow most well used 924s engines to hell.

Best is to first tune up the car you have so you can see what the base line is. Figure your 1977 if Euro Model with 125 hp to be in the 9 sec range to sixty.

Next I would clean up the head. Get it ported and polished. Match port the intake and exhaust... get a header while you are at it. Also step up to a decent regrind on the cam or get a performance one from Intregal cams.

None of this will be cheap but it is effective. My NA USA model was around 10 sec to sixty when I started this years ago and now is around 8/5 sec with a much more driveable motor. Especially since I finally found out some thing I was lacking in my throttle body set up.

Anyway then you can play with cold air intakes (which really do nothing for performance on this car) larger throttle bodies, ignition systems, and the like to add to the head work.

With out the head work not much else with be very effective. Do not take my work for it though... I have some good articles to back my words up.

http://www.geocities.com/the_924_site/BOB1_1.html

http://www.geocities.com/the_924_site/924BOLTONBONANZA2.htm
_________________
1982 924
1992 968
2003 C4S
Parts Parts Parts and More parts.
E-mail me for parts you need!
Drive Fast!

AppleBit · Joined: 16 Nov 2002 Posts: 1516 Location: Minneapolis, MN

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

My advice is to check the health of the engine by doing compression and leakdown tests, inspect cam lobes and if those check out good, use forced induction.
On the US motor that has lower CR it's relatively easy to do it, you won't get monstrous power out of it, but rather safe and decent output.

I advise it because apparently you have enough skill to do this.

Most of the problems with those engines are related to CIS stuff. THROW IT AWAY. You'll get room for turbo/supercharger. And convert to EFI. Thanks to endwrench, this has become pretty much bolt-on as you can buy fuel rail for app. 100$ and as for crank trigger, use cheap 60-2 wheel from stock E30. Megasquirt can use 60-2 wheel easily.

If you do this work yourself, it will cost you approximately 2000 $ and will get you 200 reliable hp.

No other mod except for forced induction will yield comparable results in $/hp with those engines. You throw few thousand dollars to all other things (p&p, new cam etc-etc) and you're still gaining maximum of 10-15 horses at best. You can use euro pistons and still you have only 130-ish hp with all other mods.

BTDT.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

Eturbo924 · Joined: 09 Nov 2002 Posts: 2212 Location: Londonderry NH

Well enough said.

But as others might attest... you can do the projects I have noted... and others... in a step by step process. $150 here, $400 there... over time. See gradual gains in performance and not impact your wallet in one big whack.

I have done my work over years of time and still been able to drive it when ever I have wanted to. It is only down for short periods of time and at small amounts out of the budget.

Coming up with $2K is not that easy for most. Also... some others would say... sell the 924 and take that $2K along with the $2K or so you get from the sale of the car and get a 931 or 924S.

My car at 8.5 sec to sixty has made me quite happy. It easily outruns another 1980 right here in town. It is not a rocket but is quick for a US car. Applebit will outrun me easily but he has done quite a bit more

but notes we have the same basic intent in the way we go about things.

Good luck and obviously take a look at what everyone has to say and the different paths and choose wisely

.
_________________
1982 924
1992 968
2003 C4S
Parts Parts Parts and More parts.
E-mail me for parts you need!
Drive Fast!

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

Yes, but for those 2000$ my euro 924 is MUCH faster than any stock 951, including S and does 0-100 kph in 5.6 seconds anytime a day. Sounds incredible, huh? Indeed, it was to me also.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche