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<  Workshop  ~  Megasquirt n Sparked The Volvo

PostPosted: Sat Dec 31, 2005 12:06 am
User avatarPosts: 101Joined: Wed Sep 22, 2004 4:00 am
Well I set myself the goal of getting this done before the new year and I did. In Fact I did it a few weeks ago but have struggled to get the damm pics of my phone since then.

But onto the install.

One thing to sort was a Throttle position switch. The stock one on my car is only a switch to activate the idle valve system. So I grabbed a Proper TPS from a volvo 850, cut the shaft down on a spare 740 throttle body and JB welded the TPS to the body.

For the spark side of things, I grabbed an old 240 Dizzy that came equipped with a hall efect sensor. I removed all the mechanical advance/retard crap and locked the top and bottom halves of the dizzy together. So that this would provide me with a Signal for the igniton module. This in turn was hooked up to a Bosch 139 Ignition Module scavanged from a saab.


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I retained the standard dummy rotor and dizzy on the back of the head to distribute the sparks as the parts are relatively new.

Then basically it was just a case of hacking a loom together using a scrap loom I'd scavanged from a yard with all the volvo connectors and just extended the wires a reasonable length to then connect to the MS box

This is my wiring diagram for MS with the added spark side to it.

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Which then relates to this lovely little mess under the bonnet and inside the car.

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Apart from a few worrying mins when doing some final checks and trying to set up the block dizzy to get the base timing and discovering I had no spark, which I quickly noticed was due to forgetting to give the igntion module an earth, the car fired on the 1st turn of the key.

After that success I pulled the wiring of the car, swapped the throttle body back over and plugged back in the original wiring loom.

This left me with this harness pictured below which now I can turn into something presentable and factory looking under the bonnet. and without so much slack.

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Just need to finish building my Wideband Kit so that I can install that and start tuning this thing effectively.



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PostPosted: Sat Dec 31, 2005 9:41 am
User avatarCridaperPosts: 13970Location: WolverhamptonJoined: Mon May 31, 2004 4:00 am
Really interesting to see this - thanks for posting it.

We were discussing the use of the dizzy instead of a CPS a while back and I'll be keen to hear how you get on.



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PostPosted: Sat Dec 31, 2005 3:19 pm
Posts: 228Location: Button MoonJoined: Tue Dec 27, 2005 9:27 pm
One of my mates will probably be interested in this as hes on about a mega squirt system to run a supercharger on his Mrs MK1 MR2



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PostPosted: Sat Dec 31, 2005 4:32 pm
User avatarCridaperPosts: 13970Location: WolverhamptonJoined: Mon May 31, 2004 4:00 am
Everyone seems to want a bit of megasquirt at the moment. But I only know of a handful of people who've gone through with it. Seems to be good money in making the conversion kits too.



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PostPosted: Sat Dec 31, 2005 4:52 pm
Posts: 228Location: Button MoonJoined: Tue Dec 27, 2005 9:27 pm
well weve got the supercharger a mini M45 Eaton, hes an engineer/ welder so an inlet manifold id pretty easy, an we got an intercooler too so just a question of time an effort :D



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PostPosted: Sat Dec 31, 2005 5:29 pm
User avatarCridaperPosts: 13970Location: WolverhamptonJoined: Mon May 31, 2004 4:00 am
Guess he could do with finding the ECU and sensors off one of the standard supercharged MR2s.



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PostPosted: Sat Dec 31, 2005 5:32 pm
Posts: 228Location: Button MoonJoined: Tue Dec 27, 2005 9:27 pm
thats a possible to, we`ll sort it one way or another, were gonna turbo it but not enough room exhaust side really so think we definitely going supercharged



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