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05-31-2008, 06:54 PM #1
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- May 2008
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Just installed a Megasquirt on my car
Hey guys just thought I would post that I successfully installed a Megasquirt onto my new SS. I have it piggybacked onto the stock PCM. It is set up for fuel control only at the moment but setting up spark control will take no time at all. I just wanted to get the fuel map dialed in before hooking up timing control as well. I have been driving it around today with my wideband and now the fuel map is completely sorted out and tuned in. It runs and drives just as good as a stock one. I wanted to go ahead and do this modification first thing so that when I start bolting on stuff like cam, ported heads, etc here soon I would already have a way to tune it.
Here is a thread I found extremely helpful. I basically did mine exactly like his:
http://forums.hybridz.org/showthread.php?t=122976
The only difference is as follows:
a) I did not find the .01 uF capacitors to be necessary in the crank/cam sensor inputs
b) I connected the stock temp sensors to my MS, disconnected them from my MS, then put some dummy resistors on the stock PCM temp sensor inputs to fool the computer into thinking the coolant temp is 140* and the air temp is 80*. It would probably be better to just connect a second set of sensors for the MS, but I didn't feel like fooling with all that. I plan to eventually remove the stock PCM completely.Last edited by shiftless; 05-31-2008 at 06:58 PM.
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05-31-2008, 09:33 PM #2
With all of the full tuning options and custom OS's including real time tuning for these PCMs, I can't fathom why you would do this to/for a stock car. The OEM PCM has been well proven past 1,000 rwhp. Cool that you pulled it off, but you still have to have a tuning suite to tune spark and more than that on the stock PCM... Could have just bought HPTuners and went from there on the OEM setup.
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05-31-2008, 09:37 PM #3
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Because the Megasquirt costs $140 and I had it laying around. This system also supports nitrous/water injection control, launch control (two step), and other features which the stock PCM does not support, AFAIK. At any rate, the price alone is worth it. Maybe this is a forum full of guys who have thousands of dollars just laying around to dump in their cars, but I do not. I'd rather spend my money on gas to destroy Mustangs.
And as far as the car being stock, it does not appear that you actually read my message before jumping in with your reply. Yes it is stock at this moment, but within a month will have a number of mods included ported heads (home ported of course) and a cam. I will need a tune at that point and I am NOT spending $650+ for a tuning setup or paying somebody else to do it.
Spark control is already thought of, handled, and solved. Having the Megasquirt control spark is as simple as splicing in a few more wires. The stock PCM will be left to control the transmission and other mundane chores, until I can replace those functions one way or the other.Last edited by shiftless; 05-31-2008 at 09:42 PM.
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05-31-2008, 10:04 PM #4
It's cool, but I can make a HUGE list of Pro's for keeping the factory PCM against it. You will lose the cost of a tuning suite in fuel mileage alone soon if you do much driving, not to mention the 400-700 you spend if you go with a separate trans controller... and around the same price to go manual valve body. Your time *has* to be worth something as well. Even the budget meth kits comes with their own activation devices. There are plenty of guys cutting 1.3 60' times (and I'm sure better, because I know these guys) off the footbrake and 1.2s off a brake. I read all of what you posted. With a wideband and the incredible scanning tools that come bundled, full VE and MAF (or VE if you are ditching the MAF) can be done in hour. For what you get with a suite, $650 is just not out of the question. I guess from the sounds of it you are building a race car, so it's cool, but many people want to keep their ABS, traction control, working factory gauges and the full diagnostics provided by the OEM controller, which can quickly identify many issues.
Don't get me wrong, I give you props for getting it up and going, there are few things that seem to vary from setup to setup that snag people, and it's cool that you DIY. I hope it gets you what you are looking for.
-edit-
I guess I am pointing this out also, because from where you are now, migration back to the OEM PCM is still easy. Sell the MS and be that much closer to HPT or EFIL. The stock PCM is very powerful and will provide the best driveability that I have seen on really any setup and there is a ton of support for it on the forums.Last edited by Frost; 05-31-2008 at 10:13 PM.
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05-31-2008, 10:22 PM #5
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It's cool, but I can make a HUGE list of Pro's for keeping the factory PCM against it. You will lose the cost of a tuning suite in fuel mileage alone soon if you do much driving,
not to mention the 400-700 you spend if you go with a separate trans controller
Your time *has* to be worth something as well.
I guess from the sounds of it you are building a race car, so it's cool, but many people want to keep their ABS, traction control, working factory gauges and the full diagnostics provided by the OEM controller, which can quickly identify many issues.
For what you get with a suite, $650 is just not out of the question.
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05-31-2008, 10:24 PM #6
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No thanks!
The stock PCM is very powerful and will provide the best driveability that I have seen on really any setup and there is a ton of support for it on the forums.
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05-31-2008, 10:45 PM #7
I mean the time that you will put into eliminating the OEM PCM, obviously not where you are now.
I didn't think there was any DFCO implementation in MS... On modded cars I usually find 2-7 mpg back with it (7 being the high side for injectors whose minimum pulse is still too large, but still 3-5mpg on stock setups). That's what I was talking about with mileage.
I have troubleshot a non-working MS install and tuned it, and spent many hours reading, I'm not in the dark about it all.
You didn't say how you would keep your guage cluster or ABS working either, and the guage cluster alone will be costly to build out with aftermarket guages and your factory cluster is useless without the PCM.
At any rate, there are many people who are not aware of the flexibility of our PCMs, and I just want to shed light for anyone who doesn't know. Good luck with the car and have fun at the same time.
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05-31-2008, 10:51 PM #8
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I didn't think there was any DFCO implementation in MS...
On modded cars I usually find 2-7 mpg back with it (7 being the high side for injectors whose minimum pulse is still too large, but still 3-5mpg on stock setups). That's what I was talking about with mileage.
You didn't say how you would keep your guage cluster or ABS working either, and the guage cluster alone will be costly to build out with aftermarket guages and your factory cluster is useless without the PCM.
At any rate, there are many people who are not aware of the flexibility of our PCMs, and I just want to shed light for anyone who doesn't know. .
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06-02-2008, 10:58 AM #9
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- Attalla, AL
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Just an update, I had to make one small change to the crank/cam sensor input circuits. On the stock vehicle these signals are +12V. The Megasquirt would really prefer for this to be +5V or less. With the input circuit set up as listed above, the MS will often not power on correctly due to too much voltage on the input pins. I solved this by connecting a 10k resistor from each of those circuits to ground.
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06-03-2008, 09:31 PM #10
What is the internal resistance (impedance I guess) of the input?
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06-04-2008, 09:25 AM #11
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You mean on the MS cpu? Not sure.
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06-04-2008, 01:21 PM #12
Yeah on the MS side. should be *really* high...
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