System too lean

[robvas]

It knows the ethanol content so it can adjust without having to look at lambda

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[526 HRSE]

Is there any known issues of Proflex causing problems to engines? If so, i haven't heard of any.

 

[526 HRSE]

Bigger TB opens faster, usually it's very noticeable. It's what people refer to as 'throttle response' and even though the peak HP might not be higher, the car feels faster

The larger throttle body is allowing more air flow which means more fuel can be added to the mix.

From reading through these comments, if in fact, Ford only optimized our cars to run up to 98 octane, is that the extent of what proflex can adjust to?

Also, for anyone who has tuned their gt350, would you go larger injectors? (apparently you'd need a "pro" version of the proflex to do this)

I really don't want to tune this while still in warranty.

 

[526 HRSE]

Gray from AFD is going to jump in once he gets approved to help clarify how the system works. Although, i don't think my issue is caused by the proflex, but we'll see.

 

[SnowFox]

Correct me if I missed something.

Your running E85, and you upgraded the TB. But don't have a Tune of any kind?

 

[526 HRSE]

Correct me if I missed something.

Your running E85, and you upgraded the TB. But don't have a Tune of any kind?

Correct, proflex, throttle body, CAI, no tune. No dash light.

 

[SnowFox]

Correct, proflex, throttle body, CAI, no tune. No dash light.

You should get a Tune.

-E85 I wouldn't run it without a tune ever. A big reason would be to make sure I'm not running lean and if I am, it can be revised till I'm not.

The proflex device claims. I would definitely like to hear the thoughts about it from a tuner or somebody more versed in tuning. Some of the claims seem iffy.

- Larger TB: Shit, even with a tune it can get sketchy. Some have just bolted one on and it worked ok. But the amount of problems I've seen people have with TBs even with a tune on this forum alone has kept me from even considering messing with it.

You've introduced two things that many wouldnt consider without getting a proper tune for a reason. Two things that can absolutely result in you running lean.

Maybe it's not the reason your running lean. But it would certainly be my prime suspect.

 

[JAJ]

A couple of things come to mind here - the first one is pretty obvious - maybe the Proflex gizmo isn't working properly. That is, maybe it's defective. That would certainly create a lean condition.

The second thing is the possibility that the intake tube in front of the larger throttle body is larger diameter than the OEM tube. That would lead to a lower MAF reading than is correct. Again, that would create a lean condition.

The third option is more subtle and I think less likely. The ECU has a table in it that relates throttle plate angle and airflow to pressure drop across the throttle body. This is used by the ECU to figure out how much fuel is needed to match the air in the intake manifold. Now, the larger diameter throttle body will produce more airflow at a given throttle angle, raising the manifold pressure and requiring more fuel than computed. But that's a transient problem - if the MAF signal is correct, the ECU will quickly figure out that the throttle is out of whack and close it slightly and all will be well. At best, a lean condition might last a second or two.

As for higher octane making more power, the ECU cycles spark advance upward constantly, getting to incipient knock and backing off a smidge. More octane, more advance, at least up to the point where the table in the subsystem maxes out.

As for getting a tune, tunes are one of the most common factors in the "failed Voodoo" tales of woe. I'd give it a miss unless you're prepared to spend a lot if things don't go as planned.

 

[526 HRSE]

A couple of things come to mind here - the first one is pretty obvious - maybe the Proflex gizmo isn't working properly. That is, maybe it's defective. That would certainly create a lean condition.

The second thing is the possibility that the intake tube in front of the larger throttle body is larger diameter than the OEM tube. That would lead to a lower MAF reading than is correct. Again, that would create a lean condition.

As for getting a tune, tunes are one of the most common factors in the "failed Voodoo" tales of woe. I'd give it a miss unless you're prepared to spend a lot if things don't go as planned.

I spoke to Gray at AFD and i may send the unit back once i remove everything for smog. I also need to verify that my O2 sensors are working correctly.

Correct, i have never heard of a proflex causing an engine to fail, but i hear tuning stories all the time. I actually never hear anyone having an issue with one. (I don't believe it's the cause of my issue-if i have one at all)

As suggested, i will be removing everything soon, and then replacing one by one to see if the issue fixes and comes back.

Proflex has never given me issues and i've had in on my car for years. I've only had the larger throttle body for a year, but again, have never had a cel light come on, nor have i seen the lean condition in obd2 - but i'm also not scanning my car for no reason every day.

I did have a user error a couple weeks back when i drove without my dipstick seated all the way, but have driven hundreds of miles since. Had that been the culprit, i would assume that it would have worked itself out by now?

Looking forward to Gray jumping in here.

 

[galaxy]

Sooooo, you’re worried about your warranty with a tune, but not worried about it with an aftermarket device strapped onto your fuel system?? Or am I missing something?

Not saying this is a foolproof statement, but seems self tuners are quite the rage lately. I wonder how many engine failures out there with a tune are truly, 100% attributed to the actual tune itself when done by a reputable, name brand peofessioanl?? I know both of my cars with tunes have never ran more incredible.

 

[526 HRSE]

Interesting

 

[526 HRSE]

This is at idle. And I'm running straight 91 now. Understably I have a ton of variables going on right now. Same thing happened the other day. I would imagine after driving it's going to rise - pointing to the CAI.

 

[526 HRSE]

 

[526 HRSE]

Sooooo, you’re worried about your warranty with a tune, but not worried about it with an aftermarket device strapped onto your fuel system?? Or am I missing something?

Not saying this is a foolproof statement, but seems self tuners are quite the rage lately. I wonder how many engine failures out there with a tune are truly, 100% attributed to the actual tune itself when done by a reputable, name brand peofessioanl?? I know both of my cars with tunes have never ran more incredible.

Yes, you're missing something. There's no footprint left with this device. At least that's what I understand. Unless I'm the one that's missing something?

 

[526 HRSE]

Only thing I've noticed with adding these three mods, is that the car takes a half second to find idle. I don't have a second one to compare to to see if that's normal.

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