924Board.org

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Goodness, how did all those cars survive all those years with only carburetors?

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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Min · Posted: Sat Nov 26, 2011 4:35 pm Post subject:

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

so just put in a wideband and see if it's running extremely lean or rich. If not, it will be fine.

Stupid Kjet is also off 90% of the time so chances are everyone is ruining their engine anyways with the standard fuel system.
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"Rule: Turbo's make torque, and torque makes fun." (C. Bell)

924 "50-jahre", 1981.
MSII/extra, LPG, ITB's, 5lug.
To be turbo'ed in a while.
Killed her at the Nurburgring, Porscheless at the moment

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Martijnus · Joined: 29 Dec 2006 Posts: 2019 Location: Netherlands

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

It is possible to get AFR pretty satisfactory using adjustable FPR at least in WOT. If part throttle is more or less ok after that, you can leave it like that or make a slight compromise (both areas will be slightly off, but car would be driveable).

On NA engine this would work, some people use this adjustable FPR approach with stock injection systems and self-installed turbos.

It's not optimal for sure but it is cheap and as always, it is matter of testing. I am pretty sure that there are cars with EFI systems that would work reasonably well on 924 NA but one has to have time and will to test these.
I would be interested in hearing about the results from OP after he hooks up WBo2 meter.
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'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

Min · Posted: Sun Nov 27, 2011 4:50 am Post subject:

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Sure man, take your ball and go home. . .criminy.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

ksis · Joined: 22 Aug 2011 Posts: 120 Location: New York

Thank you all for your interest.
There has been no tuning of any kind. My objective was to install a drop in system to make the car a reliable form of transportation for my son as this will be his first car.

when I find my 924, I will spend the time and research better options.

I have as of yet to install the O2 sensor so I know I am not operating at optimal performance. When this happens I will also be installing a test bung for a 02 meter to see what is going on. I know I will be able to adjust the AFM slightly.
I did short write up on the install for those that were interested and sent it via email. I will go back through and reread all the concerns and reply accordingly.
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77 924
64 Spitfire
76 TR6
04 Jetta
77 Schwinn Scrambler
Awsome pair of Chucks

http://www.cardomain.com/id/ksiskin

BionicBalls · Joined: 05 Jan 2009 Posts: 642 Location: Charlotte, NC

I took the time to convert the word document over into a post so everybody can see what has been done. I for one think this is an awesome idea and effort. How about we as a community stop criticizing and try to offer suggestions. Maybe we have finally found a cheap way to upgrade our cars into the computer era. Thank You Ksis.

This is a brief over view of what I did. I will rip the system out, take pics and do a new install. That is how easy this was…

Let me begin by having you click this link

http://en.wikipedia.org/wiki/Digifant to get an understanding of how the Digi system works.

The below pic shows what sensor input is required to make the Digi system work.

-The distributor will be the unit from your donor car. The only modification you will need to make is to swap out the gear.

- The mass air sensor will come from you donor car. The only modification will be to purchase an adaptor from your local FAP to mount a conical air filter. Remember to include the plastic pipe from the donor car.

-The throttle body will be from the donor car. This is nice because it is a direct bolt on and the only modification is swapping out the cable linkage.

- The knock sensor will be from the donor car. The verdict is still out on the mounting location. I have not seen any difference in performance. I believe this is due to the low compression of the 2.0.

-The O2 is from your donor car and a direct bolt in. If you do not have a sensor, as I didn’t, a bung will need to be welded into the exhaust. I have not done this as of yet.

-The coolant sensor will again come from the donor vehicle. There are two options for the placement. I chose the latter, as I wanted to retain all of my original CIS components if I ever chose to sell the vehicle or replace it. The first option is to replace the sensor with that from a Subaru, any year or make as they are the same. They operate in the same range and will thread right into the location of the thermotime switch. The second option is to disconnect the bypass hose and insert the sensor directly in the hose and clamp. The only modification is to grind a small channel in the rim of the hose to accept the wires. I would say this is an unorthodox move, but if you think of a universal temp gauge, this is what they do.

-Idle air control valve. This will come from you donor car and will slip right into place with the use of 3/8 hose and a small brass adaptor on the throttle body hose where you cold air vale was.

- Fuel injectors are from the donor car and will use the o-rings from your old injectors. You will retain the original plastic inserts that are threaded into the head. I am currently looking into changes to get the injector farther into the head but this seems to work just fine. The fuel rail is you choice. I commited sin and used copper fittings. I did cannibalize a 98 SAAB turbo rail for the injector cups. There were easy to remove, as the SAAB rail was made of “COPPER” and had “BRASS” fitting brazed on….

-Fuel relay. Any four prong relay will work. This will be hooked to the only three wires that you will route into the cockpit. I will list the color coding and mounting later.

You can see the red/white, red and black/yellow wires from the harness.

-Hall control unit is from the donor car and will mount with the ECU on the driver’s side of the engine compartment by the windshield wiper motor.

Complete install. O

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1980 924 NA
1982 931

ksis · Joined: 22 Aug 2011 Posts: 120 Location: New York

Bionic Balls,
You get the Hero of the day award.

Thanks for converting my write up. I know it was a quick install, the system is not fool proof and more research needs to be done. I feel a junkyard system that was less than 150 bucks, needed no guess work, was a drop in system, how could I go wrong.
As I said before, if this were my car and I could afford to keep it off the road and have a open bank account, I would do more and spend more.
_________________
77 924
64 Spitfire
76 TR6
04 Jetta
77 Schwinn Scrambler
Awsome pair of Chucks

http://www.cardomain.com/id/ksiskin

Horizonblue · Posted: Mon Nov 28, 2011 6:53 am Post subject:

Could be interesting to test the car on a dyno. Does it have more horsepower, less horsepower or the same as before.....
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Euro 924, 1976

"If you can't fix it, don't break it"

/P.G. Andersen

ksis · Joined: 22 Aug 2011 Posts: 120 Location: New York

The throttle response and top end feels better. I do how ever feel less at the lower end. This trade off is no big loss as it will discourage my son.
_________________
77 924
64 Spitfire
76 TR6
04 Jetta
77 Schwinn Scrambler
Awsome pair of Chucks

http://www.cardomain.com/id/ksiskin