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      04-09-2014, 09:05 AM   #1
waterbottle1
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IS MY AFR Way to high???

hi all,

First of all my mods:
Jb4 G5
catless dps,
dci
35% e85 mix


Okay, so i tried do some logging, failed ... as on WOT it keeps using going back to Map 4,
My AFR looks like its so confused , up and down.....


Here is what i got...

how can i lower my AFR ? and what should my AFR be ?

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      04-09-2014, 09:28 AM   #2
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I’m a caveman when it comes to JB4 native logs, but yes that looks extremely lean. Like dangerously so.

Can you post this to datazap please? Looks like you are at about 15.x:1 in the heart of the rev range. That's much leaner than i'd like to see.
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      04-09-2014, 09:43 AM   #3
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Quote:
Originally Posted by 135Pats View Post
Iím a caveman when it comes to JB4 native logs, but yes that looks extremely lean. Like dangerously so.

Can you post this to datazap please? Looks like you are at about 15.x:1 in the heart of the rev range. That's much leaner than i'd like to see.


yep, here ya go

it is much too lean ... scary lean...

http://www.datazap.me/u/waterbottle1...g=0&data=1-4-5
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      04-09-2014, 09:56 AM   #4
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yep +1 maybe you need terry's flash or get in touch with wedge i would not run my car that lean .
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      04-09-2014, 10:10 AM   #5
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Quote:
Originally Posted by waterbottle1 View Post
yep, here ya go

it is much too lean ... scary lean...

http://www.datazap.me/u/waterbottle1...g=0&data=1-4-5
OK itís not as bad as I had thought, didnít realize you rolled into WOT somewhat slowly. Once you go wide open things settle OK, though it takes longer than Iíd like to see (always does that with piggyback only), and is still a bit lean for my tastes. But itís not crazy lean, look at how it settles once you pin the throttle. I would advise you to run a backend flash, but Iím biased.
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      04-09-2014, 10:16 AM   #6
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Quote:
Originally Posted by 135Pats View Post
OK itís not as bad as I had thought, didnít realize you rolled into WOT somewhat slowly. Once you go wide open things settle OK, though it takes longer than Iíd like to see (always does that with piggyback only), and is still a bit lean for my tastes. But itís not crazy lean, look at how it settles once you pin the throttle. I would advise you to run a backend flash, but Iím biased.
+1
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      04-09-2014, 10:22 AM   #7
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Quote:
Originally Posted by cwarren View Post
yep +1 maybe you need terry's flash or get in touch with wedge i would not run my car that lean .
Yep , already emailed him.
just waiting on his reply now..

Quote:
Originally Posted by 135Pats View Post
OK it’s not as bad as I had thought, didn’t realize you rolled into WOT somewhat slowly. Once you go wide open things settle OK, though it takes longer than I’d like to see (always does that with piggyback only), and is still a bit lean for my tastes. But it’s not crazy lean, look at how it settles once you pin the throttle. I would advise you to run a backend flash, but I’m biased.
It seems it went from 14-19 on WOT but yes, it did start to fall, but fell to 13 and then suddenly back to 15.2 . . . it is extremely uneven.. and still considerably high .. i will deff look into the backend flash.
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      04-09-2014, 10:28 AM   #8
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Your fuel open loop is at 95, nothing more the jb4 can do, and your trims are maxing out. You need to reduce the e85 substantially or get the backend flash.
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      04-09-2014, 10:31 AM   #9
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Quote:
Originally Posted by waterbottle1 View Post
Yep , already emailed him.
just waiting on his reply now..



It seems it went from 14-19 on WOT but yes, it did start to fall, but fell to 13 and then suddenly back to 15.2 . . . it is extremely uneven.. and still considerably high .. i will deff look into the backend flash.
You need a LPFP. Try pulling out the E85. What mix are you running. Your not meeting target at idle so your having issues. Your h-fp doesn't look great either but fix low and see if high improves. You need to fix your fueling once that can maintain pressure you should add a backend flash.
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      04-09-2014, 10:33 AM   #10
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Quote:
Originally Posted by V8bait View Post
Your fuel open loop is at 95, nothing more the jb4 can do, and your trims are maxing out. You need to reduce the e85 substantially or get the backend flash.
How does JB4 scale fuel trims? I honestly donít knowÖobviously itís not +/- 34
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      04-09-2014, 10:38 AM   #11
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Quote:
Originally Posted by Ingeniator View Post
You need a LPFP. Try pulling out the E85. What mix are you running. Your not meeting target at idle so your having issues. Your h-fp doesn't look great either but fix low and see if high improves. You need to fix your fueling once that can maintain pressure you should add a backend flash.

so i guess ill need the lpfp 255 walbro pump ?

atm its only 35% ethanol mix with 93


i just went to servo and filled it up with 93, hoping it reduces afr for now..
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      04-09-2014, 10:40 AM   #12
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Quote:
Originally Posted by waterbottle1 View Post
so i guess ill need the lpfp 255 walbro pump ?

atm its only 35% ethanol mix with 93


i just went to servo and filled it up with 93, hoping it reduces afr for now..
There are several pumps you can use, it's your call really. A 255 works just fine.

You should be fine on pump gas, piggybacks suck at controlling trims and fueling in general, so i'm not surprised you ran out of headroom. Esp. with the stock pump getting tired.
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      04-09-2014, 10:43 AM   #13
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Also if you have autoclear on turn it off for now. You want the dme to limp if you go that lean.
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      04-09-2014, 10:50 AM   #14
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Quote:
Originally Posted by 135Pats View Post
There are several pumps you can use, it's your call really. A 255 works just fine.

You should be fine on pump gas, piggybacks suck at controlling trims and fueling in general, so i'm not surprised you ran out of headroom. Esp. with the stock pump getting tired.
yeah kinda surprised some people running much more and being fine... i guess all cars are differnt anyway..


Quote:
Originally Posted by Ingeniator View Post
Also if you have autoclear on turn it off for now. You want the dme to limp if you go that lean.
yeah its off, but i cant read anything.
CEL light appears for a second after maxing AFR and changing to map 4 automatically. but cant detect any codes.
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      04-09-2014, 11:18 AM   #15
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I just had this issue and my FOL was too low.
Bumped it up to 70 and all is good.

What is yours set at?
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      04-09-2014, 01:58 PM   #16
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What's should ideal afr be at WOT? What's a safe afr range?
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      04-09-2014, 02:22 PM   #17
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Quote:
Originally Posted by Jklad View Post
What's should ideal afr be at WOT? What's a safe afr range?
That's a fairly complex question honestly. Depends on fuel, boost, advance, etc etc. Your targets with E50 will/should be different than pump gas targeting. It's a DI motor so we have more headroom than most, 13.5:1 WOT turns expensive metal parts into liquid on a lot of PI platforms.

Lean is fast, until you melt something.
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      04-09-2014, 08:45 PM   #18
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Quote:
Originally Posted by Jklad View Post
What's should ideal afr be at WOT? What's a safe afr range?
was told on n54tech, that on e50% your aiming 12.7 - 12,8
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      04-09-2014, 09:19 PM   #19
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i run around 11.9-12.3 on pump gas or 100oct and 12.3-12.7 on e85
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      04-09-2014, 09:28 PM   #20
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Quote:
Originally Posted by AK 335i View Post
i run around 11.9-12.3 on pump gas or 100oct and 12.3-12.7 on e85
that sounds right,
u got backend flash ?... and how much e85?
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      04-09-2014, 09:40 PM   #21
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So you don't have a walbro?
Sorry I didn't realize that.

I'd get that going asap.
SteveAZ has a good kit for $200.
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      04-09-2014, 09:48 PM   #22
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Quote:
Originally Posted by waterbottle1 View Post
that sounds right,
u got backend flash ?... and how much e85?
Single turbo backend flash tweaked from terry.

up to full e85


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