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Old 11-03-2012, 11:06 AM   #1 (permalink)
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Default 6G72 TT in 87 Starion - trying to start finally

Hey all,

It's been close to 2 years on this build, but finally got to the point of getting the MS2 installed, wired up, and hopefully ready to breath life into this gal finally. Problem is, I am lost - I am far from an expert when it comes to tuning, especially when it comes to the ignition, so I am reaching out, hopefully won't sound too stupid, and hopefully get it to at least fire and idle sometime soon.

Ok, here is the high level. This is a total custom project that I purchased before it was done, and made some modifications to it. Changed the transmission to a c4 auto (going to be mainly drag car but still street legal), changed the ECU to MS2 customized for use for 3 X GM MSD coil packs, and some other things that really don't matter for the tuning/programming discussion.

Be gentle, I'm a newbie with a LOT of this stuff. hehe

The MS2 was purchased through DIY Autotune and they modified it to work with the MSD coil packs, i.e.:


Here is the list of how the MS2 was built:


The motor has the 92' style sensor on the back of the cam, from what I was told it has the cam angle and crank position in one sensor. It's a 4 wire sensor, power and ground, and what I'd assume is the crank angle and cam positioning signal wires.

Here is how I've wired up the car - no idle air controller or step downs, very basic config:


I am currently using EFI Tuner Studios instead of Megatune - not sure if that is ok or not, would like feedback on that as well, but can't see why it'd be that different. Here are the fuel and spark constants - I am 99% sure I am 100% incorrect on these But as I've mentioned, I really just don't have a bunch of background there. The old g54b starion motors were a lot simpler, and the aftermarket ECU I used on that set up came pre-programmed, so I never needed to dive this far into it.

Spark constants:


Additional spark settings:


Fuel constants:


Additional fuel settings:



So how far off am I really? Current status is, on turning the car on, ECU registers with the laptop, fuel pump powers on, fuel pressure rises to 40psi and holds, no leaks. Crank the car and starter engages, engine turns and basically sounds like it is trying to start without a hint of spark.

Any information, direction, ets, would be greatly appreciated. I know that the initial start is the hard part, and after that, I've had very good luck with megatune in the past - it's just getting it to run.

Thanks in advance! Hoping you can help me bring life into this gal!


Last edited by Turbo_Addict; 11-03-2012 at 03:03 PM.
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Old 11-03-2012, 04:07 PM   #2 (permalink)
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Default Re: 6G72 TT in 87 Starion - trying to start finally

That is the hottest thing I've ever seen.
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Old 11-03-2012, 04:42 PM   #3 (permalink)
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Default Re: 6G72 TT in 87 Starion - trying to start finally

Hopefully we can get a megasquirt guy in here to help you out. In the meantime, I'll try to pick my jaw up from the floor. The swap looks awesome. I might PM you with questions as I debate a similar swap into a Miata. Thank you for posting your project!
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Old 11-03-2012, 05:02 PM   #4 (permalink)
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Default Re: 6G72 TT in 87 Starion - trying to start finally

cant help but had to comment. the motor looks beastly when mounted properly, you should send that pic to mitsubishi titled "fixed".
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Old 11-03-2012, 08:56 PM   #5 (permalink)
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Default Re: 6G72 TT in 87 Starion - trying to start finally

Thanks! I'm really happy with it so far... it's not perfect of course, but everything can be tweaked over time. Can't wait to get it running and see those cam gears all spinning in sync.
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Old 11-03-2012, 09:19 PM   #6 (permalink)
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Default Re: 6G72 TT in 87 Starion - trying to start finally

I have very little experience with Megasquirt, but I suspect I know where your problem lies... Most cam signals are 360 crankshaft degrees in duration high, then 360 degrees low to identify #1 cylinder.

The mitsu cam and crank signals (regardless of if you have the 1st gen CAS or 2nd gen CMP/CKP sensors) has three equally spaced crank sensor pulses per revolution (six pulses in a 720 degree firing cycle) and four cam pulses per camshaft revolution.(A 720 degree firing cycle) One of the cam pulses is longer than the other three to identify #1 cylinder.

I have no knowledge of how you program the Megasquirt to accept that configuration, but I know it's been done...
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Old 11-03-2012, 09:50 PM   #7 (permalink)
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I'm no help for MS but engine looks awesome! Love the intake mani and view of cam gears.


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Old 11-04-2012, 06:49 AM   #8 (permalink)
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Default Re: 6G72 TT in 87 Starion - trying to start finally

Quote:
Originally Posted by RealMcCoy View Post
I have very little experience with Megasquirt, but I suspect I know where your problem lies... Most cam signals are 360 crankshaft degrees in duration high, then 360 degrees low to identify #1 cylinder.

The mitsu cam and crank signals (regardless of if you have the 1st gen CAS or 2nd gen CMP/CKP sensors) has three equally spaced crank sensor pulses per revolution (six pulses in a 720 degree firing cycle) and four cam pulses per camshaft revolution.(A 720 degree firing cycle) One of the cam pulses is longer than the other three to identify #1 cylinder.
Great information, thanks! I'm sure that will help in my research!
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Old 11-04-2012, 08:45 AM   #9 (permalink)
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Default Re: 6G72 TT in 87 Starion - trying to start finally

More Pics!!!
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Old 11-04-2012, 09:20 AM   #10 (permalink)
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Default Re: 6G72 TT in 87 Starion - trying to start finally

That looks awesome!
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