Mental Addiction said:If you have 100% control of injection/fuel timing will increase midrange torque and fuel economy.With a synced/seq. the injector is spraying during the intake stroke. This allows you to spray fuel at precisely the right time when the airflow into the cylinder is the greatest providing the best possible atomization and the highest efficiency.
TurfBurn said:Most of the research documents I have checked also state that the gains are in the 1-3% range. Additionally, stock vehicles typically alter that methodology and often intentionally fire the injectors such that they complete their injection just as the valve opens (NOT during the intake stroke)... this increases valve cooling and has other "potential benefits" that some expound (including increase vapor etc in the tract) but are a bit more sketchy.
Additionally, to fully take advantage of the full effect of spraying during the intake stroke it is typically considered to be best standard to set up your injector spray timing so that the injector completes within a fraction of a millisecond before the valve closes. This requires timing the injectors relative to the angle of the motor relative to RPM for optimal firing... another feature that the Microtech has as well.
Everyone should keep in mind that the way a "stock" vehicle runs its fuel systems is often significantly different than how a "race" vehicle will run it's fuel systems. And while something may be more efficient than another... it is often matters of a few percent... on a 300 horse vehicle we are talking about 3-9 horse based on the 1-3% gains that is claimed with more efficient injection control schemes.
Lastly, while individual injector trim is great and all it requires several things that I doubt anyone on this forum has or does... you need to actually run a wideband for each individual cylinder to be able to determine the amount of trim necessary. While this extreme can be avoided by having the flow characterstics of each of your injectors, you still have to deal with any cylinder to cylinder variation in compression due to ring wear, any change in air flow on a per runner basis of that manifold, and any of a number of factors that significantly impact the AFR of each individual cylinder. Thus, use of individual injector trim is nearly impossible for the average user. The closes we can typically get is by periodically reading plugs and adjusting a trim for that particular cylinder, and/or switching injectors between cylinders to re-balance the system.
Just remember... every time you add a feature or an item... that is another thing you need to tune for it to be worthwhile or even non-detrimental.
Mental Addiction said:Yes, the AEM can be alittle overwhelming for a first time user, but so was the first Playboy magazine he opened. With alittle time you master it.
Mental Addiction said:We also need to keep inmind heavily built and Boosted Protege don't run on the STOCK computer. They run a standalone. The more features a system has the better and more efficent the system is.
You can never have enough features on a standalone. Yes, the AEM can be alittle overwhelming for a first time user, but so was the first Playboy magazine he opened. With alittle time you master it.
TurfBurn said:..........While Playboy may have it's merits, sometimes people want just the "articles" and jokes without the silicone and airbrushing.
Bigg Tim said:WHAT THE HELL R U SAYING?????? Who wants to read when there's nekid chicks on the next page!!!!!! You're starting to worry me a little.![]()
Bigg Tim said:HEY, I want in on the debate!!!!! The MPI has made the most power on the protege, per PSI, so far and it's a piggyback. I made over 220whp at 8psi, back east, and there was that MSP in Canada that made like 230-240 at 8psi (I believe) with the MPI and an xtra injector. When installed and tuned right, it's great. No need to worry about batch or sequential firing because it's a piggyback and the stock ECU does a fine enough job with that. Also no need to worry about cold starts or anything like that. You can pass Emission testing with it installed also. Now TOP THAT fella's!!!(evil)
Now, there is no need to get harsh, I'm just trying to poke some fun here with turf and Beau while also stating some facts. Please do get all bent out of shape.(thumb) I have no experience with other units so I am biased. I'm sure they are great in what each one does. I like things to be simple and sweet, so stand alones scare me a bit with all the tuning you do. I all boils down to what the owner wants to do and nothing else!!!!
TurfBurn said:"articles" man not articles. LOL... My point was sometimes things have extras that, while great, aren't necessarily the taste of everyone else... some guys love huge fake titties... others prefer a little more au naturalle.
Bigg Tim said:LOL, I knew what you meant.....just bustin your balls!!!
If you are talking an all out race car, maybe. This way you an live with the drawbacks of the standalones.Mental Addiction said:We also need to keep inmind heavily built and Boosted Protege don't run on the STOCK computer. They run a standalone. The more features a system has the better and more efficent the system is.
daedalus said:I would agree with you to some degree... but then other stuff about the stock computer bothers me... like the fact that it cant hold timing at idle and jumps all over the place, causing the stumbling and sputtering our MSP's are becoming known for. To be honest, I cant think of much it does well. I'm at the point where i've decided the less the stock computer knows, the better.
SpicyMchaggis said:I think we all know the A'pexi S-AFC is the best piggyback on the planet. (stfu)
Spooled said:So if I read this correctly, sequential injection should nearly double your fuel economy since half the injectors are just wasting fuel, right? Well, I guess not really double since when the intake valve opens for the cylinder that had a wasted shot, that shot gets sucked in along with the current shot. It's probably a lot more accurate, though, since that wasted fuel probably pools up and isn't atomized as well.
That's it, I want SFI now!