347 stumbling under hard acceleration

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347 stumbling under hard acceleration

Unread postby kf4mms » Mon Feb 19, 2018 5:23 pm

I got a 1993 Mustang Gt with a 347 with a powerdyne supercharger. The ECM is the A9P with the A9L2 tune in it. It used to have an AOD but I converted it to a 5 speed. Low and mid throttle seems to do very well. The thing runs like a scalded dog when taking off but seems to stumble or fall flat on its face during hard acceleration. I have new plugs, new cap, rotor button, new wires, new TFI and swapped coils with a known working one to see if that was the issue but no dice.

It does have a pretty mean cam in it and 42lb injectors. I have setup the injectors in the tune along with the maf, and engine cubic inch size. Checked all the spark plug wires and all are intact (not melted).

What could be causing the stumble under hard acceleration? It doesn't back fire it just sort of lays down but picks back up if you let off of it. Maybe more timing?
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Mon Feb 19, 2018 7:59 pm

What is lambda and lambse doing? Post your tune and a log when you can.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Tue Feb 20, 2018 4:40 am

I will post logs as soon as I can get the .adx to work. When I load the digital dashboard I am getting all sorts of weirdness. Must be missing something here.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sat Feb 24, 2018 1:33 pm

Got the latest .adx file and applied the patch. I am not seeing the data in realtime. There must be a setting I am missing somewhere. Can anyone help?
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Feb 25, 2018 9:28 am

Disregard my previous post. I got the .adx working. Fixing to take this thing for a drive shortly and do some logging.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Feb 25, 2018 10:22 am

Here are my logs after a quick drive.
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sun Feb 25, 2018 4:31 pm

My adx might be broken, but that's all gibberish on my end.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Feb 25, 2018 7:17 pm

I am using the latest .adx and patch applied.

Will attach the tune to this post.
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sun Feb 25, 2018 10:14 pm

The latest adx is from 11/09/17
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Mon Feb 26, 2018 5:39 am

Sorry, I guess it isn't the latest. Here is the .adx that I am using.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Wed Feb 28, 2018 7:12 pm

Anyone?
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Thu Mar 01, 2018 12:23 pm

its prob best if you use the latest adx, no point in using that outdated file
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 04, 2018 8:07 am

I have an Innovate LC2 (brand new) that I hope to install today. Most of what I read, folks were using the LC1. Will the LC2 still wire up and function correctly with TunerPro RT? It came with a 1" bung to weld on but I do not have a welder so I will disable the driver side O2 and install the wideband in that bung.

I need to use this car as my daily driver for a while since my other car has a transmission issue. However, this thing is really devouring gas like crazy. 5 gallons will last me less than 20 miles riding around town. Horrible mileage but I assume that the engine is still running pig rich. Maybe the wideband will help dial it in a little better.
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Re: 347 stumbling under hard acceleration

Unread postby decipha » Sun Mar 04, 2018 11:36 am

its better to use the narrow bands to dial it in for daily driving
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 04, 2018 12:41 pm

From the diagrams I find, it looks like pin 27 is the brown with light green wire. On the LC2 controller after hooing up power, I have a yellow and a brown wire left. I think brown wire from the controller will go to the brown w/ light green wire on pin 27, right?
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 04, 2018 2:09 pm

I am getting .72 lambda at warm stable idle.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 04, 2018 4:07 pm

The innovate software was reading like 22 afr. Something crazy going on here. It could've have been running out of gas here but not 100 % as the gas gauge was almost on E. Earlier, I was getting like 13 -14 afr which would mean it is rich, right?
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Thu Mar 08, 2018 1:35 am

I've been using the wife's car to go back and forth to work. Very inconvenient. Will try to work on the car some this weekend. Does anyone have any ideas on the extreme gas usage?
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Thu Mar 08, 2018 7:29 am

Download the latest adx and take another log so we can actually look at it.
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Thu Mar 08, 2018 8:49 am

Still need to post your tune too.
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GT-40 upper and lower
65mm TB
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U4P0/U4P2/CBAZA
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Thu Mar 08, 2018 6:37 pm

Yes, will do.
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sat Mar 10, 2018 11:41 am

Just got the car good and warm and then took it for a little ride while creating a log. Log and my tuner are attached. Please review and let me know what (if anything) I can do about the horrible mileage, bucking, stumbling. I did note a slight ping at about 60mph while in 5th. A friend of mine mentioned that faulty injectors could cause some of these issues. Please review my log and tune.

Many thanks in advance.
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sat Mar 10, 2018 1:01 pm

FN070 got corrupted, injector output (numego) still has a 2 in it, FN882 got corrupted, and the low slope is lower than the high slope. Are you turning on the ignition before you connect the QH to your laptop and disconnecting before you turn the car off?
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GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sat Mar 10, 2018 1:11 pm

Yes, pretty sure I followed that procedure when connecting and disconnecting. How can I fix it?
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sat Mar 10, 2018 1:19 pm

Try this. I fixed all the stuff I mentioned above. See if it runs any better. It should.
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9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sat Mar 10, 2018 1:31 pm

Thanks, Slowbox. I downloaded the file to my laptop and will push it to the QH tomorrow. I really appreciate your time and responses on my issue / issues
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sat Mar 10, 2018 1:34 pm

Sure thing. If you ever get stuck again, you can always download a fresh A9L2 and copy your combo's values into the new tune. I had to do it a couple of times when I was starting out.
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GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sat Mar 10, 2018 2:01 pm

Do you suspect that these things may have been causing the issues I was experiencing?
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sat Mar 10, 2018 2:30 pm

Probably. The odds are good.
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GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby decipha » Sun Mar 11, 2018 1:32 am

in the logs shes running pig rich the whole time and never switched to closed loop

you need to reduce the maf at least 25% or so
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Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 11, 2018 7:45 am

Thanks Decipha. Should I just reduce all of the MAF values by 25%?
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sun Mar 11, 2018 12:27 pm

Fuel still needs dialed in. You can start making adjustments once the corrupted functions are fixed and the eec is doing what it's supposed to.
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GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 11, 2018 12:30 pm

How does this look. Uploaded the changes by Slowbox and did the recommended MAF changes from Decipha.

Thank you both for the help.
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Vehicle Information: 1993 Mustang GT w/ manual transmission, 347 stroker, engine Powerdyne supercharger, 42lb injectors, Comp Cam XFI236Hr-14. Tuner Pro RT, Moates Quarterhorse. LC-2.

Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sun Mar 11, 2018 12:43 pm

See how it runs.
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GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 11, 2018 1:32 pm

Yeah, seemed to be much more manageable while driving. Not as much bucking. AT WOT is starts to take off and then falls flat then picks up and goes again.
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Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sun Mar 11, 2018 1:44 pm

I would avoid any boost until you can get some fuelling data. Look for a trend in maf cell corrections so you can make an educated guess about high load cells. It's a lot easier to burn pistons in a blower car.
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GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sun Mar 11, 2018 2:38 pm

From the logs the wideband data looks like garbage. Lambse is switching the hego and finding stoich though so it's getting some kams data from closed loop, but it's kinda all over the place. Now that your issues are ironed out you can start following the writeups and dial the car back in.
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Vehicle Information: 1989 Mustang GT
4r70w, 3.73
GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 11, 2018 3:30 pm

It is tuneable from here, right? Do you think I am any closer?
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Vehicle Information: 1993 Mustang GT w/ manual transmission, 347 stroker, engine Powerdyne supercharger, 42lb injectors, Comp Cam XFI236Hr-14. Tuner Pro RT, Moates Quarterhorse. LC-2.

Re: 347 stumbling under hard acceleration

Unread postby SlowBox » Sun Mar 11, 2018 3:46 pm

It's tuneable and you're closer. Decipha was correct to have you pull that 25% out of the curve and honestly it may still be too rich. Keep an eye on it and make sure it isn't getting too rich or lean and you should be fine to keep making adjustments.
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Name: Troy G
Vehicle Information: 1989 Mustang GT
4r70w, 3.73
GT-40P heads
Alex's Parts springs
Stock cam
9.7:1
GT-40 upper and lower
65mm TB
Decapped injectors
Single 70mm snail
U4P0/U4P2/CBAZA
TunerPro v5
Moates QH v1.6

Re: 347 stumbling under hard acceleration

Unread postby kf4mms » Sun Mar 11, 2018 3:57 pm

Yep, will do. Thanks for your and Decipha's help this weekend on this. The car does feel like it is making progress now. Starting to feel more like a Mustang and less like a pig. LOL
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