.....

[limequat]

In a MAF car when the MAF is considered failed by the computer it then defaults to fuel tables that are leaner and timing tables which have more spark so yes, Ford could very well have a limiter that your hitting that would lean the car out. ( I know the EB is not a MAF car, thats just a comparison)

So now your saying you logged fuel pressure and it was dropping? Originally you only said it was going lean due to observed airfuel readings. Could you post the log of that fuel pressure drop please?

JJ

Is this a Ford thing? GM doesn't tune that way. It doesn't make sense to me that the OEM would switch to a more dangerous tune (less fuel, more spark) when a sensor goes bad.

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[JJ@WMS]

Is this a Ford thing? GM doesn't tune that way. It doesn't make sense to me that the OEM would switch to a more dangerous tune (less fuel, more spark) when a sensor goes bad.

It sounds stupid for sure but thats what can happen. Once the MAF is failed the computer goes to the Load with failed MAF table and that table is usually lower load and in lower load is usually more spark. Lightnings blow up because of this exact stock tune feature.

JJ

 

[PewterCam]

Can you modify the failed MAF table? I'd be all over modifying that to keep things safe.

 

[mbreinin]

So now your saying you logged fuel pressure and it was dropping? Originally you only said it was going lean due to observed airfuel readings. Could you post the log of that fuel pressure drop please?

JJ

Here you are. Two logs. The first is a hit on the street on Friday night with the previous boost level, the second is the run at the track. I have highlighted the fuel pressure PID.

Mike

 

[JJ@WMS]

Can you modify the failed MAF table? I'd be all over modifying that to keep things safe.

Yes with a MAF calibrated vehicle we can and we do that all of the time.

JJ

 

[JJ@WMS]

Here you are. Two logs. The first is a hit on the street on Friday night with the previous boost level, the second is the run at the track. I have highlighted the fuel pressure PID.

Mike

Good info thanks.

We were not seeing that in our car at all. Fuel pressure was solid even at 27psi, the highest we tuned for.

Hope you get it figured out.

JJ

 

[mbreinin]

Good info thanks.

We were not seeing that in our car at all. Fuel pressure was solid even at 27psi, the highest we tuned for.

Hope you get it figured out.

JJ

We got it figured out for now. This was not an issue until the DA was really mineshaft.

Mike

 

[DanFish]

From what I'm taking From this it is good to always monitor important data while driving hard. What gauges would you recommened I monitor.

 

[Rob WH]

This recent conversation made me curious if it wasn't just that specific vehicle... and a poor fuel pump, at least when under duress. I'd probably at least consider a replacement, be it factory or aftermarket.

From what I'm taking From this it is good to always monitor important data while driving hard. What gauges would you recommened I monitor.

The one called "Data logger!" :headbonk:

To even get an idea of what they're looking over, that's your bet, but... you could install a fuel pressure and a fuel ratio meter. Problem is, by the time those let you in on it, the damage may be done. I'd find out if there's a different shutoff scenario to use insofar as shut down because it seems to me that shutting off fire is less dangerous than shutting off fuel. :shrug:

 

[mbreinin]

This recent conversation made me curious if it wasn't just that specific vehicle... and a poor fuel pump, at least when under duress. I'd probably at least consider a replacement, be it factory or aftermarket.

I sincerely doubt it. It was a combination of cold, dense air and a good deal of boost. I don't know of any replacement pumps available yet, although you could use a BAP. I am sure if I started to use meth, it would be enough to compensate.

Mike

 

[Rob WH]

I sincerely doubt it. It was a combination of cold, dense air and a good deal of boost. I don't know of any replacement pumps available yet, although you could use a BAP. I am sure if I started to use meth, it would be enough to compensate.

Mike

I think of meth as a bit much, but these days it's so common.... polly not.

Considering the engines in use, I have to think the pump could be replaced by the same aftermarket pumps a GT can use. Of course, I've never pulled the tanks from these new models and wouldn't know for sure, but it seems Ford would be bright enough to use the same pump, since the nannies control the flow anyway. Still, I don't suppose a Walbro 342 would do it these days.

 

[Reds197]

Can you use BAP on direct injection?

 

[mbreinin]

Can you use BAP on direct injection?

You can on the electric pumps. It would do nothing for the mechanical pump, obviously. I am not sure if it would cure the issue. Is the issue not enough fuel being supplied to the mechanical pump, or is the mechanical pump running out of capacity?

Mike

 

[djt81185]

You can on the electric pumps. It would do nothing for the mechanical pump, obviously. I am not sure if it would cure the issue. Is the issue not enough fuel being supplied to the mechanical pump, or is the mechanical pump running out of capacity?

Mike

Dan T from the sloppy mech group here. Told you I was following along. Have you checked if the hpfp is the same as the mazdaspeed 3? I know they have hpfp upgrade kits for those.

 

[mbreinin]

Dan T from the sloppy mech group here. Told you I was following along. Have you checked if the hpfp is the same as the mazdaspeed 3? I know they have hpfp upgrade kits for those.

I don't know if it is. I wonder who would?

Mike

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