Can someone decipher this maping? - Chevelle Tech
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post #1 of 25 (permalink) Old Jul 1st, 20, 10:24 AM Thread Starter
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Can someone decipher this maping?

My 6.0 falls on its face under full throttle. iron 6.0, LS2 intake, LS6 cam, ported 853 heads. Walbro 255 pumpHad Branden at LT1swap.com program the computer. Under full throttle it falls on its face, recovers and then repeats. Can someone look at this graph and see if anything jumps out at you.


https://youtu.be/YimD2VmKF8E

Tighten it till it strips and back it off a quarter turn.
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post #2 of 25 (permalink) Old Jul 1st, 20, 11:19 AM
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Re: Can someone decipher this maping?

Are you using a Corvette style filter/regulator?

I've seen that very symptom on production vehicles with either clogged or defective aftermarket filters.

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post #3 of 25 (permalink) Old Jul 1st, 20, 1:24 PM Thread Starter
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Re: Can someone decipher this maping?

Yes. Corvette regulator/filter. Wix brand.

Tighten it till it strips and back it off a quarter turn.
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post #4 of 25 (permalink) Old Jul 1st, 20, 1:54 PM
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Re: Can someone decipher this maping?

Quote:
Originally Posted by Alwhite00 View Post
Yes. Corvette regulator/filter. Wix brand.
I would consider Wix a good brand.

Could you monitor fuel pressure?

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post #5 of 25 (permalink) Old Jul 1st, 20, 2:05 PM Thread Starter
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Re: Can someone decipher this maping?

I'm rounding up a gauge as we speak. Btw. No codes present and no check engine light.

Tighten it till it strips and back it off a quarter turn.
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post #6 of 25 (permalink) Old Jul 1st, 20, 2:44 PM
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Re: Can someone decipher this maping?

Post an OBD2 log of your Long and Short Term fuel Trims when it falls flat. This will further confirm a fuel problem at high rpm.

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post #7 of 25 (permalink) Old Jul 1st, 20, 5:31 PM Thread Starter
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Re: Can someone decipher this maping?

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Originally Posted by B52bombardier1 View Post
Post an OBD2 log of your Long and Short Term fuel Trims when it falls flat. This will further confirm a fuel problem at high rpm.

Rick

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Whatever I posted is what I have. I’m going to be posting a video of the fuel pressure shortly.

Tighten it till it strips and back it off a quarter turn.
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post #8 of 25 (permalink) Old Jul 1st, 20, 6:04 PM Thread Starter
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Re: Can someone decipher this maping?

Here is the fuel pressure video.

https://youtu.be/henZdMXcVrI

Tighten it till it strips and back it off a quarter turn.
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post #9 of 25 (permalink) Old Jul 1st, 20, 8:00 PM
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Re: Can someone decipher this maping?

Quote:
Originally Posted by Alwhite00 View Post
Here is the fuel pressure video.



https://youtu.be/henZdMXcVrI
Looks like you're losing fuel pressure.

If it were me, I would get an AC Delco brand filter/regulator and give it a shot.

Small gamble to take.

I can think of a few other possibilities, such as the pump not doing it's job correctly for whatever reason. Like voltage drop or defective pump.

But a new factory filter/regulator would be my first step.

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post #10 of 25 (permalink) Old Jul 1st, 20, 8:28 PM Thread Starter
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Re: Can someone decipher this maping?

I swapped pumps already. I'll call the stealer tomorrow.
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Tighten it till it strips and back it off a quarter turn.
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post #11 of 25 (permalink) Old Jul 2nd, 20, 9:32 AM
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Re: Can someone decipher this maping?

In for the fix...

Here's a link to my 2014 Camaro SS donor to 70 Malibu restomod project:

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post #12 of 25 (permalink) Old Jul 2nd, 20, 11:19 AM Thread Starter
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Re: Can someone decipher this maping?

I talked to my cousin. He mentioned maybe the wire for the fuel pump is not big enough. I'm going to check that out as well. An AC regulator is $100 so I'm going to try to make sure that is the problem before swapping.

Tighten it till it strips and back it off a quarter turn.
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post #13 of 25 (permalink) Old Jul 2nd, 20, 11:44 AM
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Re: Can someone decipher this maping?

I did mention voltage drop in my previous post.

I was thinking a filter/regulator was around $40.

Are you going to hook up a volt meter close to the tank/pump and monitor it similar to the way you monitored the fuel pressure?

I'm still going to hedge my bet towards the filter/regulator, but all Information is good Information.

If you monitor the voltage, then that's something you now have hard data on, that's a good thing.

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post #14 of 25 (permalink) Old Jul 2nd, 20, 11:58 AM Thread Starter
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Re: Can someone decipher this maping?

Quote:
Originally Posted by senna View Post
I did mention voltage drop in my previous post.

I was thinking a filter/regulator was around $40.

Are you going to hook up a volt meter close to the tank/pump and monitor it similar to the way you monitored the fuel pressure?

I'm still going to hedge my bet towards the filter/regulator, but all Information is good Information.

If you monitor the voltage, then that's something you now have hard data on, that's a good thing.

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Yea, I missed that. I was thinking fuel. I’m just going to run a new wire from the relay, simple to try and I know it’s a small wire on there. The AC Delco is 100. All others are out $40. Go figure.

Tighten it till it strips and back it off a quarter turn.
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post #15 of 25 (permalink) Old Jul 2nd, 20, 12:09 PM
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Re: Can someone decipher this maping?

Quote:
Originally Posted by Alwhite00 View Post
Yea, I missed that. I was thinking fuel. I’m just going to run a new wire from the relay, simple to try and I know it’s a small wire on there. The AC Delco is 100. All others are out $40. Go figure.
The fact that the AC Delco cost twice as much as the aftermarket might be indicative to the failure of the aftermarket ones.

Either way, I support you giving the wire a shot.

I have a very similar build and sort of questioned the feed wire going from the fuel pump relay that
I extended a little further. So I'm definitely interested in your outcome.

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