Getting the most out of your Apexi S-AFC= Stock MAF honeycomb removal

[boostedVR4]

BTW, I'm now seeing a higher % IDC than before, and I'm running leaner than before.

I've also decided that the tuning with the stock 02's suck. Period. I'm gong to be getting the FJO w/display. Cheapest I've seen so far is $700ish.

I'm also thinking of letting Extreme try the Haltech on my car. That also uses the GM MAP sensors and FJO wideband.

[Innovator]

Originally posted by Multiades
When you are getting closer to maxing out the injectors, you are showing the ECU very high airflow values. If you are able to show the ECU the same airflow values WITH the negative correction (for uprated injectors) that you were showing it with the stock injectors, you will run the stock timing.

If you add injectors that are 50% larger than stock (compensating with the AFC), then proceed to make 50% more power than stock, the ECU has no idea that there was any change at all.

Now with 50% larger injectors (550cc/min), you do not compensate with the AFC downwards 50% -- you compensate downwards somewhere around 34.54%. In other words the ECU will see:

(100% - 34.54%) = 65.46%

of the airflow going into the engine.

However, 50% more airflow (or 150% of 65.46%) equals approximately 100%, so the ECU will see the same airflow as before the injectors, and will actually be delivering 50% more fuel to the 50% more air coming in.

Hope that is a relatively clear explaination.

-Chris

I think I get it

[Multiades]

Originally posted by Innovator
I think I get it

Excellent. Overall I hope this thread will be informative for others -- I think this mod has very real benefits for improving airflow through the MAS and allowing for more air to be metered (peak).

I'm probably just going to do a cheap MAF upgrade rather than play around with the honeycombs, because un-smoothed airflow could cause metering inaccuracy or inconsistency and I'd rather have my tune stay put.

EDIT: My figures above are a little rough for simplicity, 550cc/min injectors are actually ~52.77% larger than stock, but who's counting.

-Chris

[Eric_VR-4]

~fixing boost leaks: was one of the most exciting MODS I ever did too ~

Well I am in the process of trying this out.. I took em out.. richened 10% (idle more like +22 from +7) and everything is running perfect. I still need to go out and tune some WOT runs. I noticed spool up is darn near twice as fast

Right after I learn myself about using O2's and EGT's to tune, everyone runs out and gets those expensive widebands, and says they are a must... dammit so those that are using widebands: when you finally get it tuned perfect... what are your stock O2's showing? is there any consistency in the stock O2's after you have tuned using the Wideband?

Some say .92-.94
Some say .94-.96 and on and on... I was wondering what they look like after a good tune... cause until I get back to the dyno I won't be tuning with a Wideband.. those suckers are just expensive.

Also I noticed you guys running the S-AFC are talking about low and high settings. I thought my HKS was about the same.. but there are no low/high settings... just GAIN (which is the settings @ WOT through the RPM band in 11 different spots), IDLE, and RESPONSE (which no one really seems to understand how to tune) what up with that?

[Innovator]

Originally posted by Multiades
Excellent. Overall I hope this thread will be informative for others -- I think this mod has very real benefits for improving airflow through the MAS and allowing for more air to be metered (peak).

I'm probably just going to do a cheap MAF upgrade rather than play around with the honeycombs, because un-smoothed airflow could cause metering inaccuracy or inconsistency and I'd rather have my tune stay put.

EDIT: My figures above are a little rough for simplicity, 550cc/min injectors are actually ~52.77% larger than stock, but who's counting.

-Chris

I've tuned it for a flat 12:1 until 5K where I tuned it for a flat 11.5:1, and there is not any inaccuracy or inconsistency in the A/F. Maybe .2 at the most which may be just my foot not depressing the pedal all the way at all times..

[DJAuggie]

Too much misinformation and false claims. I am unsubscribing. I come to this forum to learn about my car, not hear about BS dynos and timeslips.

To be honest, I am so sick of people saying this does that and after asking them to prove or explain for my own benefit as well as others, I get bitched at. Well, it's complete BS and I am positive I am not the only person that feels the same way.

The purpose of this forum should be primarily to learn about this car. It's great to have people like Multiades explain the Physics and really get into detail about what's going on. It's also great to hear IPO talk about real life story about how it's applied.

It just really sucks to have people say this and that and not explain HOW, WHY, etc. I understand there are things that some one just doesn't understand. For instance, I know we can get on the moon, I dunno how, we just can. However, when a person gets mad, it's bullshit.

-Shawn

[Innovator]

Originally posted by DJAuggie
Too much misinformation and false claims. I am unsubscribing. I come to this forum to learn about my car, not hear about BS dynos and timeslips.

To be honest, I am so sick of people saying this does that and after asking them to prove or explain for my own benefit as well as others, I get bitched at. Well, it's complete BS and I am positive I am not the only person that feels the same way.

The purpose of this forum should be primarily to learn about this car. It's great to have people like Multiades explain the Physics and really get into detail about what's going on. It's also great to hear IPO talk about real life story about how it's applied.

It just really sucks to have people say this and that and not explain HOW, WHY, etc. I understand there are things that some one just doesn't understand. For instance, I know we can get on the moon, I dunno how, we just can. However, when a person gets mad, it's bullshit.

-Shawn

WTF are you talking about?

You have nothing to offer us, and only have negative things to say about everything. There have been many people that have already benifeted from this thread. So WTF is your problem?

Take some lithium.

Get off this thread, and get lost. Apology to me before or not, you are still an asshole Shawn.

[Jim Floyd]

I'm learning from this thread. Please continue.

[DJAuggie]

Originally posted by Innovator





WTF are you talking about?

You have nothing to offer us, and only have negative things to say about everything. There have been many people that have already benifeted from this thread. So WTF is your problem?

Take some lithium.

Get off this thread, and get lost. Apology to me before or not, you are still an asshole Shawn.

I don't have "only negative things to say about everything. " I have problems with people like you who say they dyno'ed this and ran this. I never ONCE in this entire thread disrespected you. I simply wanted more information to make sure that I was making the right decision. You even got pissed at people like IPO who had similiar experiences with DIFFERENT results.

Personally, I believe *NOTHING* that you say. Explain how you say you ran a 11.89 @ 125? Hang on, lemme 0wn your ass with a friggin screen shot. Either your the worst fucking driver on the planet (125MPH trap) or you're just a plain fucking liar. What turbos was this run on? Stock 9bs? 13Gs? 15Gs? 17Gs? Or the IHI Ball Bearing Turbos?

Or was this on the turbos that had the recent dyno of "475 AWD HP and 468 torque at the same 17 PSI and 15G’s."

Your right, I don't have much to offer. I am trying to learn. I thought I made that completely clear in this thread. I try to fucking learn about this stuff. It's quite sad that I come here and get BS from you and others who can't simply explain or prove their mods/ways will BENEFIT others. It's people like YOU that make me wish I never bought my car. You fill the forum with your BS that you WONT and CANT backup. It's not my fault your a fucking waste of a mechanic that could benefit the 3/S owners in the area but they all fucking hate you.

Your right. This mod may have helped others, your attitude just plain sucks. So, why don't you take your "insanely fast 95 VR-4", along with your 9,000 FT2 mechanic complex, your brand-new z06 , your 11.89 @ 125MPH timeslip, your dyno, your BS Navy Seal title, up your ass!

[92vr4ny]

The thread is helpful, just need to sort out what is known, what is theory and what is just plain bullshit. Removing the honeycombs maybe cheaper tempary fix, not a long term solution if you have big plans for our car. The MAF signal starts having trouble right around 380awhp, so this would be a good mod until you start pushing the higher hp numbers. That is if it works for you, which does not always seem to be the case. So it is just another option for a number of people.