And then it just magically tunes itself along with the $200-300 in extra sensors/parts you need to make it work?

If I were going to invest in an EMS it would probably be AEM. But I have no plans for this anytime soon myself. My comment wasn't directed for me anyway.

 

not to thread jack but my set up was tuned in roughly 80deg mild humidity weather and now that it's cold I actually run a lil richer. Not that it upsets me cuz I'm throwing fireballs left and right and it's entertaining but I guess I was mistaken in thinking FI cars run richer in cold weather? It makes sense the whole denser air = more air for the same amount of fuel but it doesn't seem the case with mine? Or am I just crazy ?

Btw I have an AEM EMS and am in no way an authority on boost, just a boost junky.

 

Weird. Earlier today. Only about 38 degrees out and the car ran great. 12.7 or so wot at redline. Last night would shoot way past 13 when hitting it. So sometimes when cold out works great other times not so much.
Very odd...

 

There is some automatic correction processing in an EMS. A programmed target for your afr which can stay in target with up to 1psi fluctuation, or in other wards a very hot to cold day. This is my understanding anyhow, I’m sure someone who knows the AEM EMS can add. For those of us that are just running a rising rate mechanical fuel pressure regulator, we are susceptible to the temperature and humidity conditions, and our afr reflects this.

Modition I have noticed this at times as well, I believe the humidity plays a part in this as well as how warm the car is overall, if your sitting in traffic/stop and go vs just cruising. IAT is a big contributor.

 

Yeah I think it also helped that it is really sunny out so maybe helped heat things up a bit to run a bit richer. Very strange how finicky it is though lol.

 

Well you may still have a slight issue that is compounding this... who knows. You running the CT FPR now btw?

 

Still have the Vortech fmu in there. I think I might try installing the comptech map clamp and ditch the blox map block thing see if maybe that helps.

 

Wow so you have no way to adjust your fuel? Just hold on and cross your fingers it won't be too lean that day huh. Well that's one way to do it. lol

I'd put that CT FPR back on there, at least then you would have some control over your afr. Or put in a meth kit to add fuel and give yourself a measure of safety.

 

ems has quite a few bad ass features.

first, you have an air temp fuel correction table. as intake temps rise or fall, you can have a correction factor for fuel.

you have o2 feedback. set an afr target, <of course tune car first to get dialed in> and just in case environmental changes happen it will tweak your fuel for you.

last, and simplest, typically the biggest problem is cold weather, esp for sc guys as colder air means potentially more boost. scale fuel up in areas of the map you dont think you will hit, even in the side of conservative if you want.

i would never boost my car with a fmu rising rate thing ever again. i lost a built h22 motor to a combo of shit ass solutions instead of an ems. i was very ignorant and i will never do that again.

injectors and an ems. never worry again.

 

Thanks for the post.

I agree and disagree with you on the EMS. On one hand you get a device that can really dial in your tune great given the user is doing their job. on the other hand your trading the most reliable ECU (Honda) for one that has proven to have its inherent issues... such as injector driver failures, OEM Honda control functions, OBD2 compliancy and more... For me, I've had pretty great success with a rising rate fpr and a few other "shit ass solutions" to get my power down to the ground. I think any user can F up a system if they are not familiar enough with its strength/weaknesses to know how to utilize them to their reliable capacity. When you start getting greedy and ignoring your intuition you can have problems, when the equipment you choose to use isn't operating to its full capacity you can have problems, and then your ability to run a tune that is safe for your driving habits is crucial as well. And then of course having the ability to monitor your basic running condition of the motor such as afr is a must. Just my 02.

I've been running my trusty FPR/VAFC set up for years, 75k+ miles. And with the addition of the Meth last year, I was able to up the boost and gain an added measure of safety at the same time. But I realize I'm a bit of an anomaly making 360whp with stock injectors in the s2k club.