Turbo Grand Prix 3500 swap

[Jonpro03]

I got very... VERY lucky today. Earlier last year, I helped a buddy build a megasquirt2 for his camaro. He's going to sell the car now and I GET THE MEGASQUIRT!

YAY ME!

Now I don't have to buy a external crank trigger saving me $150. AAAANNNNDDD I now have unlimited tuning capabilities.

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[Jonpro03]

Is there any advantage to running the new style ICM/CP that came with the 3500?

[robertisaar]

i believe the new style is a "quick sync" ICM. compared to when the old style had to rotate potentially 360* before there was a spark event(to find notch 7), the newer style does it in less than 120* IIRC thanks to the coded wheel.

[Jonpro03]

Is it compatible with the old system?

Does it require a different set of inputs?

[robertisaar]

depends.... the way it worked with the old system was that the ICM read all 7 notches and sent a pulse to the ECM 3 out of the 7 times(once at the +1 notch(or was it at the normal notcth before/after it?) and then two other times when every other notch passed.

with the newer ones, i'm not sure what kind of signal they send... i may be able to look it up.

[robertisaar]

whoa, new ICM is WAY different in terms of controls.... it looks like the crank position sensor is directly connected to the PCM, not through the ICM like the older ones... the newer PCM also individually controls the coil packs, instead of supplying a signal to the ICM for it to control them.

[Jonpro03]

Ya, I don't think megasquirt is going to run that.

[Driver_10]

Mark at TCE just got through fitting my 3500 crank with an internal relucutor wheel. He made a run of about 15 wheels in all I think. You may want to consider sending your crank to him and get it fitted with a wheel also. Then you can use a 95 Camaro ICM and then be able to use the megasquirt.

Its a bit more expensive then using the external wheel because you will have to remove and send the crank to a shop unless you have a means of aligning the crank position prior to mounting (hence the reason I sent my crank off to TCE). It may be just as good to wait on the external trigger.

Its just an idea that Im tossing out there for concideration if you need options.

[CNCguy]

The LX9 trigger wheel is unique and I don't know of anything that will work with it except the stock ECM. The good old DIS system with the 7x trigger is hard to beat. Simple and reliable.

A batch of trigger wheels where shipped to WOT-Tech yesterday for those in need.

Thanks for the plug John. The new internal wheels require removal of the crank but they can be installed by the owner without being sent here. The install procedure is to mark the crank with a center punch, remove the old rings, heat the new ring to 450 in your Easy Bake oven, drop in on the crank, align the marks and let it cool.

[Jonpro03]

Does anybody have a diagram of the lx9 trigger wheel? I have to figure out how to make megasquirt read the signal it's putting off. Does it have a notch every 6 degrees except for 2 to mark tdc or something like that?

The ignition control module from a 3400 requires a 7x signal doesn't it?