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924RACR · Posted: Thu Sep 06, 2007 10:09 pm Post subject: MSD 6AL installed successfully

Just wanted to say thanks, we did the install yesterday, and it went quite smoothly, no issues, fairly quickly too! Fired right up, no worries. That diagram worked perfectly, was VERY helpful - THANKS!

We used the mag pickup as noted, stock distributor, worked very nicely. Obviously our wiring is a little different due to this being a racecar; no stock wiring still in use, MSD is wired to the kill switch, and ignition is likewise all different - now a toggle on the dash.

It went so easy, I'm almost tempted to put one in my car... (still all stock except for a Permatune CD ignition)

PS - car's going to the dyno tonight for debug (make sure we finally killed off that miss) and tuning. Engine's an old stock rebuild, not built like mine; we should get some numbers representative of a tweaked stock motor with bolt-ons only (header and race exhaust, the MSD, and otherwise very stock - though we'll be adding an offset cam key while on the dyno).
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

goc931 · Joined: 10 Feb 2004 Posts: 33 Location: Sweden

Pocketscience, if you are still here at the forum can you please explain if and how you managed to switch off the engine using the ignition key or if you installed a main switch, which I am using today?

In my main set up, slightly different than alexroys, the fuel pump didn't start so I have removed the relay and short wired it between the 30 and 87 contacts. Now I am only managing it manually with my racing main switch. This is not ideal since I might want to have the power on for my electrical blower and don't want to have the fuel pump working at the same time. How did you get your fuel pump relay to understand the signal from the MSD without "hanging" itself?

Any advice on these tho issues would be extremely appreciated. I have a race on Saturday the 22/8.

Best regards
Goran
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Porsche 924 -83, Race car
132hp, 950kg w/o driver

pocketscience · Posted: Mon Aug 17, 2009 8:10 pm Post subject:

Hi Goran,

I fixed it with the ballast resistor. Wired it up as-per the MSD doco and it worked a treat.

Cheers,
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

goc931 · Joined: 10 Feb 2004 Posts: 33 Location: Sweden

pocketscience · Posted: Mon Aug 17, 2009 8:34 pm Post subject:

If you have the doco that came with your MSD check-out page 9. It has the wiring, and talks about the type of resistor - "Chrysler Dual Ballast Resistor). I don't recall the specs on it, but they are dirt cheap (<$10).

http://www.jimsautoparts.com/mopar_performance_ignition.htm
http://www.leeparts.com/mopar/electrical/ignition/resto_dual_ballast_resistor_.html

Cheers,
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

goc931 · Joined: 10 Feb 2004 Posts: 33 Location: Sweden

Ok, so I have to pollute the car with Chrystler components.

You are a real "Mate" thanks.

Best regards
Goran
_________________
Porsche 924 -83, Race car
132hp, 950kg w/o driver

pocketscience · Posted: Mon Aug 17, 2009 8:48 pm Post subject:

goc931 · Joined: 10 Feb 2004 Posts: 33 Location: Sweden

Sure, no morries. Just kidding.

I just have to find a dealer nearby that carry them, before Friday.

Thanks
Goran
_________________
Porsche 924 -83, Race car
132hp, 950kg w/o driver

goc931 · Joined: 10 Feb 2004 Posts: 33 Location: Sweden

Just a final clarification, did this ballast resistor also solve the fuel pump no-go problem or was it only the engine run-on problem?

If not, how did you take care of a fuel pump relay not starting the fuel pump?

Sorry for being a nuisance.

Goran
_________________
Porsche 924 -83, Race car
132hp, 950kg w/o driver

pocketscience · Posted: Tue Aug 18, 2009 10:12 am Post subject:

The resistor solved the engine run-on problem. I never had an issue with the fuel pump so can't really comment. Sorry.

G.
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

goc931 · Joined: 10 Feb 2004 Posts: 33 Location: Sweden

pocketscience · Posted: Tue Aug 18, 2009 4:32 pm Post subject:

OK, it was a while ago when I hooked it all up. Will try get to the garage tonight and spec it out. I'm not using the white line, only the green/purple - I know that much. My Bosch box was sitting there for months, but I eventually removed it completely. Didn't notice any change in behavior when it came out.

I didn't do anything funky, or beyond was was documented by MSD - and it started first go and I haven't thought about it since quite honestly...

G.
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

goc931 · Joined: 10 Feb 2004 Posts: 33 Location: Sweden

pocketscience · Posted: Thu Aug 20, 2009 7:59 am Post subject:

Hi,

No tach adaptor - again just hooked up the tach output form the MSD and it worked. Also I'm using the stock FP relay - didn't touch that at all.

The orange from MSD goes straight to the + terminal on the coil - nothing else is connected to that point.

The thin black from MSD goes straight to the - terminal on the coil - nothing else is connected to that point.

The previous coil connections are simply connected together - very much like the earlier diagram.

The tach output from the MSD connects to the existing green/black wire running to the tach. In my case this also runs to the MegaSquirt.

Good luck!

Cheers,
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

goc931 · Joined: 10 Feb 2004 Posts: 33 Location: Sweden

Thanks pocketscience

That is clear to me now.
I've got a funny noise from the back of the car (fuel pump?) when I connected the tach output from MSD to the black/green combo cable when the ignition was off, so I thought there must be something fishy there and removed it. I should maybe investigate more about it since that is the only thing different in our set-ups.

I have bought and installed the ballast resistor but don't dare to start the car to try it out. It is 15 minutes past midnight here.

Tomorrow will be the day.

I am also planning to use the oil pressure sensor to manage the fuel pump/relay in some way.

Thanks again mate.

Goran
_________________
Porsche 924 -83, Race car
132hp, 950kg w/o driver