Discussion in 'OT Driven' started by Isamu, Aug 30, 2006.
Anyone have it? or atleast experience with it?
I have one on a turbo'ed escort gt...thing was a little bit of a pain to get all the wiring down but other than that tuning it was a breeze and i put about 20k miles on that setup with no real issues.
so would you say it's worth the 200$
Is this for your 3g Eclipse?
more like something fun to play with, and maybe install in the jetta..
AEM EMS pwns my eclipse thanks..
I have heard several occasions where the MS goes lean for a brief moment, for a unexplainable reason, and then...
Well, you know...
Never heard of that one
I saw one on a Talon, and it just blew up mid dyno. They were looking at the A/F map and you could see where it dipped into dangerous AFRs
i still wanna know whats wrong with my 3g?
so it doesn't look so great.. bah.. i thought it might be a good experiance building my own... oh well.
That doesnt necessarily mean the MS was at fault. The tuning, fuel pump/injectors etc might have played a part there.
Anyways check out the msefi.com forum...there's a lot of good info there.
It seems to be that what I hear is that MS is really good for switching from carb to EFI
so in your honest opinion, is it worth dropping to 200$ for an experiment..
Why does leaning an engine make it blow up, again? I've never really understood that.
leads to knock/ping which gives you premature detonation... Bent connecting rods, blown gasket, busted block... etc.
It also makes things really hot.
It's not an experiment if it's done right, and we have tons of members (240sx.org) who have tuned with MegaSquirt with no issues.
How does leaning the engine lead to predetonation? The compression-induced heat inside the cylinder is the same regardless of the A/F ratio.
Fuel acts as a coolant (in the most basic of terms).
Ever use a torch? Too much fuel = orange or red flame, cooler.
Add air, flame goes light orange, white, blue = hotter.
quite a few guys on the Starion/Conquest side use it with the Magma intake system and like it....
that's pretty much all I know but have heard nothing but good results..
Leaner=hotter. Get too hot and and the air and fuel in the chamber will blow up before it is supposed to.
I understand that adding more fuel will choke the detonation and reduce the burn temperature, but pre-ignition (pinging) happens when the A/F mixture gets hot enough to detonate before the spark fires off. There are three things that affect the pre-spark temperature in an engine:
1. The compression ratio of the engine. (constant.)
2. The temperature of the A/F mixture. (constant, for the sake of discussion -- let's assume the test is run in a laboratory.)
3. The thing I don't understand.
What is the thing I don't understand?
take a mixture of air/fuel and COMPRESS it... At some pressure level, it will self-detonate. Max-efficiency is to get the mix as close to combustion as you can, without actually getting predetonation, then firing the spark plug. If you lean the mixture beyond this, you will cause ping/knock.
Basically, when there is less fuel in the mixture, then obviously there is going to be less to ignite. As the mixture is being compressed, if there is not enough fuel to keep the mixture cool until burnt by a spark, then it will ignite on its own.
This is how diesels work without spark plugs; they have crazy high compression, and it is almost impossible to kill a diesel engine from knock.
A bunch of reasons scattered around.
Basically, a richer air-charge coming in will cause a cooler-burning combustion. It's not the compression-heat, it's the flame's heat. A leaner burn causes more heat to be produced....good for horsepower to a point. A lot of the heat (most of the heat!) stays around the combustion chamber (put your hand on a hot motor and see how much heat gets wasted through heat-loss!). Since a motor's combustion chamber is not a perfect globe w/ a mirror finish on the inside, there will be points that will heat up faster than others. When these points get too hot, they will act as a glow-plug and ignite the combustion chamber before the spark plug fires, causing preignition.
I heard about a friend of mine that ran a 240z w/ the 280zx turbo mill on MS. Worked fine, just had to get the wiring figured out.