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 Post subject: is it possible?
PostPosted: Tue Jan 01, 2008 11:53 pm 
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TBI Slant 6

Joined: Sun Nov 11, 2007 9:59 pm
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Location: Chico, CA
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Chart adapted from the American College of Sports Medicine 1998 Position Stand: The Recommended Spinach 1 cup cooked 0 0 I was surrounded by fruit-fearing, living-food misinformation. I was eating
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Last edited by polkat on Tue Feb 01, 2011 4:11 pm, edited 3 times in total.

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 Post subject:
PostPosted: Wed Jan 02, 2008 4:41 am 
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Supercharged

Joined: Sun Jun 04, 2006 4:53 pm
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Location: Gaithersburg MD
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Bob's article is a very good primer for EFI concepts. The problems with it are that most of the stuff he used is now at least 20 years old, and is not tailored specifically for your engine. Most of the guys with slants are using Mega Squirt, which is a share ware concept with such a large following that there are now companies preassembling the ECU's and selling them at very reasonable prices. They also sell kits which you can assemble yourself. The real strength of MS is that there is such exhaustive support. Go to www.Megamanual.com and read,read,read. There is a very useful tech forum for Mega Squirt which you join just like this forum. Sometimes that can seem a little negative in nature since the posts are mostly from guys having problems. You don;t get to read the success stories as often as the challenges(problems).

I have gone with Accel GenVII, which is a good system, but the documentation, tech help, and instructions are terrible. I don't recommend Accel for this reason, even though it works well.

There are many, many other systems out there, and a search of the web will find them. The most critical difference in my opinion is what kind of tech support they offer. Mega Squirt is cheap, and works well enough for most needs. This means that you will be able to get your car running well before you exhaust the features offered. Go for MSII. This offeres timing control, and makes the system pretty complete in the control you can design into the configuration of the system just for your car. The base system, or MS does not offer timing control, but keeps your old mechanical timing control with centrifigal and vacuum advances. This will work, but has serious limitations.

The more control you build in, the more tuning you will have to do,and the possibility exists that you may never get it just right. Sometimes simpler is better. I would do this again, in spite of the fact that it has taken a long time to learn. Good luck in your research.

Sam

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 Post subject:
PostPosted: Wed Jan 02, 2008 5:57 am 
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Turbo Slant 6

Joined: Fri Feb 06, 2004 9:47 pm
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Actually, Both MS and MS II can do ingition control. Just that MS II have several more features plus more resolutions for the fuel and ignition curves.

For long time, MS was only one with Extra support for using DIS ingition other than distributor for spark plus several other items catered to the racing. MS II Extra is gaining experience and support growing/debugging/improvemnts.

Cheers, Wizard


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 Post subject:
PostPosted: Tue Jan 08, 2008 12:51 am 
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TBI Slant 6

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Location: Chico, CA
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Hummm... Yes, it's true that Bob's system is not taylor designed to the slant 6, but then of course, no system is! After researching it for a week, I look at it this way, the GM 3.8L system is a mass airflow system, which has greater accuracy (particularly at the middle ranges) and is more tolerant of engine wear or upgrades. Further, the 3.8 (or particularly the 4.1) MAF sensor is designed for a slightly larger engine, and shouldn't cause any performance restriction on the 225. It is true that there is no adjustment to the GM computer, but I've read of several people now who have done this swap successfully.

I understand that many people are going to the Megasquirt. Even Bob says that's the way he'd go if he had it all to do again. Well, I'm a pretty good mechanic and know electronics fairly well, but when I went to their website I got lost immediately. I'm just looking for a simple swap, not something I have to read about for hours before I can begin to install it. And it scares me to see how much troubleshooting support there is! I think I'll give Bob's idea a shot, and if it works, then I'll think about getting a MS. By the way, will the MS operate a MAF system?
________
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Last edited by polkat on Tue Feb 01, 2011 4:11 pm, edited 1 time in total.

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 Post subject:
PostPosted: Tue Jan 08, 2008 7:21 am 
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Yes, it can. It needs a voltage based MAF; some MAFs are frequency based and do not work with Megasquirt.

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 Post subject: Whoa.
PostPosted: Tue Jan 08, 2008 7:25 am 
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Turbo Slant 6

Joined: Fri Feb 06, 2004 9:47 pm
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Either way, you still have to prep, install, adapt, wire up, get it going, tuning. I did lot of research and I saw.

So this comes out in a wash for any of these choices.

Go megasquirt pre-assembled unit, MS Extra DIS 6 set up with MPFI. You want to get away from TBI. TBI have same issues as carb for warm up and need for heated plenum, port injection is much better.

MAF sensor is extremely expensive and break once you pull it/fiddle with it, I have seen this happen often. And it's restrictive, go with air flow based on RPM type even the megasquirt did say use volume of air flow x rpm instead of MAF.

And you do have to ask on megasquirt forums and read some stuff. Your pervious experience is very helpful.

Cheers, Wizard


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 Post subject:
PostPosted: Tue Jan 08, 2008 9:19 am 
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Quote:
Megasquirt. Even Bob says that's the way he'd go if he had it all to do again. Well, I'm a pretty good mechanic and know electronics fairly well, but when I went to their website I got lost immediately. I'm just looking for a simple swap, not something I have to read about for hours before I can begin to install it.
www.sdsefi.com

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 Post subject:
PostPosted: Tue Jan 08, 2008 10:10 am 
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Quote:
Well, I'm a pretty good mechanic and know electronics fairly well, but when I went to their website I got lost immediately. I'm just looking for a simple swap, not something I have to read about for hours before I can begin to install it.
The Megasquirt documentation can be overwhelming at first, but with any system your going to need to do your homework. In the long run you will be thankful there IS documentation... ask Sam what he went through with his accel system. Especially for the price, it is a DIY'er delight.
Quote:
I think I'll give Bob's idea a shot, and if it works, then I'll think about getting a MS
Not a good idea - for the work you'll have to do in converting the wire from one to the other, you'll wish you had just started with the megasquirt. And if for whatever reason the GM system doesn't work at all you will get discouraged from MPFI all together and tank the whole project. The way I look at it, you're going to start with gm and move to MS if gm doesn't work, or start with GM and move to MS if gm does work and you want tunability. Soooo whats the point of the gm? :)

The whole MAP/MAF thing is overrated. Either way you are going to be tuning since this is all custom work. Tuners that don't want to touch the ECU like maf based systems so they can tweak other engine components without having to retune anything. But even that has its limits.


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 Post subject:
PostPosted: Tue Jan 08, 2008 12:13 pm 
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Supercharged

Joined: Sun Jun 04, 2006 4:53 pm
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I know it is over whelming to look at the Mega Manual for the first time. However, with time it will make sense to you. The thing is, when you hook everything up, and it doesn't work right, which is almost certain to be the case, what do you do? The Mega Manual tellls you. If you want it to run better, what do you do? The Mega Manual will tell you.

Sam

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 Post subject:
PostPosted: Tue Jan 08, 2008 12:25 pm 
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I've written an article on the ignition control side of using Megasquirt on vintage Mopars, including the slant six:

http://www.diyautotune.com/tech_article ... engine.htm

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 Post subject:
PostPosted: Tue Jan 08, 2008 4:06 pm 
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TBI Slant 6

Joined: Sun Nov 11, 2007 9:59 pm
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Location: Chico, CA
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Thanks Matt, I already downloaded that page.

All right guys! I guess I have some reading to do! Could someone suggest what page on the MS website I should start with? Will the MS I do ignition control? Or should I consider the MS II? I'd like to look at the basic manual, but for some reason (maybe because I'm an idiot) I can't find a page for it on that website? Thanks!
________
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Last edited by polkat on Tue Feb 01, 2011 4:12 pm, edited 1 time in total.

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 Post subject:
PostPosted: Tue Jan 08, 2008 4:21 pm 
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This is the link to the megamanual table of contents.

The price difference between an MS-I and MS-II assembled is something like $80. I wouldn't bother with the MS-I. The manual will spell things out in detail. MS-I will do ignition but it may take some modifying. There are other differences besides ignition - 12x12 tables instead of 8x8, afr target tables, etc. You can gain some of the features back on MS-I by using the alternate firmware MSNS-E (aka mega squirt and spark extra) but the hardware itself still limits table size and resolution.

For the overall cost of the project, its a no brainer for the $80 difference.


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 Post subject:
PostPosted: Tue Jan 08, 2008 7:23 pm 
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Supercharged

Joined: Sun Jun 04, 2006 4:53 pm
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The guys here with successfull EFI slants will guide you through this. No question is dumb. I would start with the FAQ (frequently asked questions). Then go down in order through the index. Don't try to understand every detail the first time. You need a global understanding before the details get clear. But once you have read for awhile, the global understanding starts to come together, and then the details all start to make sense.

BE patient and don;t rush things. I speak from experience here. I was constantly pushing things faster than my knowledge allowed. In the end things work well, but my impatience maybe made things a little more frustrating. This group was an enormous help for me and my project. And, they were very patient with me.

Pardon me if I am talking down to you, but this is a very short summary:

Injectors are digital devices that turn on and off. They squirt fuel into the air stream when they are open, and don;t when they are closed. How long they are open is a function of the information the sensors send to the ECU, and the calibration parameters that you program in.

There is a fuel system, an ignition system, and the ECU/ sensor system. They are interelated, but somewhat seperate too. Just start reading about each of them to get a grasp of the hardware you need, and how they inter-relate with each other through software, and wiring. As it starts to come together in your mind, and in your car, it gets quite exciting as you discover how to make this beast do what you want it to. It is cool. 8)

Sam

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 Post subject:
PostPosted: Tue Jan 08, 2008 7:57 pm 
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Turbo Slant 6
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Joined: Mon Jul 17, 2006 12:30 pm
Posts: 699
Location: Nweberg, OR
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Some poeple suggest a learning curve or something applies to new projects, this one was more like an Everest. Reading the manual the first time when I was 17 was like holy shicks. However, stick with it and skim through the manual enough to know the basic idea. Sometime during this project you'll have an epihany and all will make sense, untill than ask, ask a lot! Reading the manual for me was difficult untill I had the parts in my hands, than I could reference back too it when I came across a specific problem.
If your building from scratch it will be easier than the GM unit, because you know every detail of your setup and will know why things don't work. Just yesterday I diagnosed the HEI unit wasn't telling my engine to advance yadda yadda... but I could pin point it, not just guess what was wrong.
I've been into writing threads about how to and wrote one about my TBI expirence. It isn't extremely detailed, but it should kinda be a nice start. If I had to write a to get you started would be simply starting with the Constants page, fill that out perfectly. Next would be have the computer make you a VE Table from the generator. To start with it will be difficult to rough out an idle, but shouldn't be a problem. The igintion I can't suggest much more other than start with the most basic one, so you can simply work on the fuel. Once you get all that done come back and talk to us about start up!


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 Post subject:
PostPosted: Tue Jan 08, 2008 11:35 pm 
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TBI Slant 6

Joined: Sun Nov 11, 2007 9:59 pm
Posts: 232
Location: Chico, CA
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Yea, that is talking down at least a bit, but I understand why. I do have a pretty good basic understanding of fuel injection, just not of Megasquirt. If I go this route, I'll build from a kit. I've built a lot of electronics, so why not save every penny I can?

So can you get the MSII in a complete kit, or only the partial kits I've read about, and at what prices?
________
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Last edited by polkat on Tue Feb 01, 2011 4:12 pm, edited 1 time in total.

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