Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum - Reply to Topic
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace

Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > Focus Tuning Chat > "safe" afr for high compression NA...

Focus Tuning Chat Discuss performance tuning options for your Ford Focus.

Search This Forum | Image Search | Advanced Search    

Thread: "safe" afr for high compression NA... Reply to Thread
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
What I Drive
Year, color, and model of your car. Example: 2003 Focus Centennial Edition Sedan
Your real name.
Please select your insurance company (Optional)


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options
Miscellaneous Options

Topic Review (Newest First)
09-30-2009 08:30 PM
iminhell ^Tis true, but the funds don't agree, hence why I'm looking for the cheap alternatives, which are widely untested. All in due time though.
09-30-2009 08:15 PM
illinipo I cant add anymore timing it is at borderline knock right now. As I said I actually had to pull some to get .882 to work. The knock sensor is not "holding me back" my sensor is turned off right now. I need to get some bigger buckets in there so I have the correct cam timing and overlap, THAT is what is holding me back (mechanical issue, not tune issue!!). Right now the lash is about .005-.010 too much across the board.

my engine is telling me it likes .882 a lot better than .867 despite having to pull some timing so I am going to listen to its advice and run .882.

im running .55 gap on the Ford coppers with no issues, there is no evidence of ignition problems not in how it feels and not in how the logs look. Back when I had ignition issues you could see MAF counts get choppy and its just not doing that.

John I think you need to get out there and actually do some tuning, your opinions of these things will change as you start to understand whats going on.
09-30-2009 06:37 PM
1turbofocus More timing, to a point, should yield more power , But at what point , if timing is low already then yes more timing will net more HP/TQ , If the engine wuns at peak safe HP and you add another 2 deg , in most cases you will not make any more HP

No tuner can sit back and say , Yep that engine needs XX deg of timing to run its best , the engine will tell you what runs the safest and best , No 2 engines are the same even factory engines

The things you see on youtube about tuning most of what I have seen is worthless when it comes to the Focus , you dont know what engine , compression , internals there tuning so you never know if what there talking about will actually work on the Focus and because you dont know this what there talking about is worthless

More top "Mustang tuners" have blown up Boosted Foci then people with PRP that have never tuned a car before ,They try to tune them like a Mustang and you cant , they get to agressive with the timing and A/F

09-30-2009 04:57 PM
iminhell If the later is true, then one would have to assume that the knock sensor is hindering you. More timing, to a point, should yield more power. That also assumes the AFR is correct.

Honestly though, you'll never know unless you put it on the rollers.

I think I'm running more compression than you and I've just got a off the shelf chip, and I'm pretty sure I'm not experiencing any knock (though I've no way to substantiate that).

Out of curiosity, did you have to gap your plugs down too?
I have to run a .040" or smaller gap or I seem to blow out spark, maybe it's knock though; .045" and I feel it for sure. BTW, I seem to be getting by fine on pump 92.

Also remember that with more pressure comes more heat. Not sure what you're running for plugs, but I'm having good luck with the NGK LZTR5A-13 / 4998 gaped @ .035".
09-30-2009 03:23 PM
illinipo I assure you my timing is not too high. It is dissapointingly low... I'm not even close to MBT.

Also that is not a Zetec by any means so what he says about AFR does not necessarily apply.

But what you are asking is the essence of my question:

What makes more torque, is it more timing and more fuel, or is it less timing and less fuel?

My butt dyno says the latter is true, and I only had to pull a tad bit of timing to add .2 afr without knock.
09-30-2009 03:12 PM

Just a guess but, might you be tuning rich due to too much timing and thereby loosing power?
09-29-2009 06:56 PM
illinipo I ended up going to .882=12.96, had to pull .5 degree in some places a full degree in others, but the car pulls a million times better.
09-26-2009 08:15 AM
1turbofocus I can set the sensitivity of the KS in my software on each Cyl this seems to bring it back in line with the few ZX3 that are off

09-26-2009 03:35 AM
illinipo the sensor is going nuts. it is just giving jibberish. all of the log files I have sent you in the past showed it going crazy, anything above .4 load it will go full retard no matter what spark. You helped me out in the beginning figuring out what was wrong with it, and we ended up just turning it off... Since then ive been doing alright with the tuning, just some mechanical issues that I needed to work out. Had to go to SVT injectors, had to vent the PCV, still need the right size buckets, etc etc. its not even worth tuning it right now really, everything's gonna change when i get some bigger buckets. I have about .010" to gain on almost all valves... the cam timing and overlap being that far off is making things interesting.

Thanks for the tips on afr.
09-25-2009 10:01 PM
1turbofocus I would shoot for the 12.8 to 12.9 , for NA safe for playing around , If your going to the track I would shoot for 12.6 to 12.7 as you will see it creep up to 12.9 to 13 with long hard pulls , that with 95-100 octane will make for a safe weekend

I have told you many times to send me your file or datalogs and I would help but nothing

You have a 2002 ZX3 , why not use the stock knock sensor vs messing with the noise

This thread has more than 10 replies. Click here to review the whole thread.

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

All times are GMT -5. The time now is 01:41 PM.

Copyright 2002-2015 All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Mazda CX-3, Audi S3, Mazda MX-5 Miata and Acura TLX. You can find all Ford Focus, Focus ST and Focus RS related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. If you own other makes have a look at Challenger Hellcat Forum, Charger Hellcat Forum, Cadillac ATS-V Forum, Cadillac CTS-V Forum, Lexus RC-F Forum, Lexus GS-F Forum, Mercedes GLA Forum, Mercedes GLE Forum and Volvo XC90 Forum.


Search Engine Optimization by vBSEO 3.6.1