924Board.org

Lightning22 · Joined: 21 Sep 2006 Posts: 25 Location: UK

Has anyone fitted one of these systems to their 2.0 924? I'm in the process of fitting one to a Midas Gold and would be interested to hear if anyone has done the 924 with one.

Is the stock system so bad? 25mpg from a fuel injected, streamlined car that in all honesty ain't that quick seems pretty poor to me. I had a 2.0 Alfa 75 that ran at 150bhp and delivered around 40mpg in a car that was nearly as aerodynamic as a brick, all that on essentially the same fuel injection system..

Rich

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Ya, I have one on mine. It was one of the first "mods" I did to it after getting it up and running. I think the OE ignition curve is heavily orientated towards emmisions namely NOX. These motors can handle a far faster more aggressive ignition curve. I think this is the biggest advantage of going MJLJ.

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

Lightning22 · Joined: 21 Sep 2006 Posts: 25 Location: UK

Hi Todd,

Thanks for the reply, did you find an improvement in fuel economy?

Rich

endwrench · Joined: 07 Dec 2002 Posts: 1631 Location: Victor, Montana

Didn't really drive it long enough before moving on to EFI and a blower.

Todd
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'79 924NA. Rebuilt 9.5:1, MSDS header, Mega Squirt Injection, MJLJ-EDIS Ignition, 1.6L Whipple Charger and Intercooler, 10lbs Boost, 944 Trans, Custom HD Clutch.
"simsport" said....superchargers are better than turbos its official!....

macBdog · Posted: Tue Dec 02, 2008 8:54 am Post subject:

I had a mega jolt too, nice bit of kit. Worked fine, was able to dynamically dial in advance no probs.
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1979 931 with a 350 chev
1973 911E with EFI

flyguy · Joined: 31 Oct 2008 Posts: 75 Location: Hamilton, Ont

Hey guys. I got a 77' 924. What is this Mega Jolt thing? What does it do? To me it sounds like it improves gas milage?

Lightning22 · Joined: 21 Sep 2006 Posts: 25 Location: UK

It's a cheap fully mappable ignition system.

Details here http://www.autosportlabs.com/megajolt-lite-p-39.html

Fast924S · Joined: 18 Feb 2005 Posts: 39 Location: New Haven, CT

http://forums.pelicanparts.com/showthread.php?t=443767

Here is a guy on pelican running it on a 924S
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Rebuild COMPLETED, Many mods, better power, Just ask for info

Pieter · Joined: 06 Mar 2008 Posts: 53 Location: South Africa

Has anyone done this type of conversion on a US spec 924 (either with EFI or CIS)? Was there any big difference in performance? from the Hayens manual it seems that there is a more than 5 degree difference between the US and Euro spec vacuum advance curves. Also, a 1 point in CR difference should translate to around 3% difference in peak BHP, so the differences between Euro and US should be less than this, if everything else is the same.

It seems to me that my vacuum advance is not operational at all, so I will be adding on ignition to my VEMS EFI, just need to source the parts for this(coil pack, trigger wheel and pickup). But it would be great to hear from other peoples experiences on EFI and ignition on the US spec motor.