erratic fuel pressure dual cp3

[isudiesel]

We have ppe dual cp3 set up with a big pump in the valley and a stock pump on top on our lbz. 60 exergy injectors. Top pump is fed from t after the lift pump. We are seeing fuel pressure dancing from 18000 to 29000 above 3200 ish rpm. We have tried to tune it out of it, numerous regulator combinations, cascade valve, etc. Any thoughts?

 

[S Phinney]

You may have a fuel supply problem.

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[blk smoke lb7]

What motor?Could be a fprv if its lb7,could be injectors relieving.I had a problem with my injectors 2 years ago relieving at higher rpms and it would vary.New injectors and the problem was solved.

 

[isudiesel]

Thanks for the input.
I am still running it throught the stock test port and fuel supply pressure remains above 8-10 psi consistently.

This is on an lbz. No fprv. Using a race valve. Maybe its time for the big injectors.

 

[JoshH]

It's a tuning issue.

 

[DIESELMAFIAPER.LB7]

how bout some more details on the truck were you located maybe someone is close who could help

 

[isudiesel]

Joshh
Any more thoughts on the tuning? This has been ongoing since last year. Nick looked at it back then remotely, but couldn't get it smoothed out.

 

[Dan@PPE]

have you tried a stock tune?

If the tune is locked there is not much anyone can do to try and help.

 

[isudiesel]

Fuel pressure tables are set back to stock. Tried changing b1015 but does not seem to make any difference.

 

[DIESELMAFIAPER.LB7]

Pretty easy to flash over the locked ecm and start new to have you switched the controller? ive had one ppe crap out for some reason on my truck

 

[isudiesel]

New ppe controller on the way. I will know shortly if it is the controller.

 

[Dan@PPE]

I don't think its a controller issue.

 

[isudiesel]

I am running out of options short of new pumps, injectors, etc. Do you have an idea of what the issue is? Have you seen this before with a modded and stock pump?

 

[Dan@PPE]

Yes I have seen the issue before (a few times). Almost every time it has been related to the tuning/the tuner..

 

[Dan@PPE]

Do you have logs?

 

[Dan@PPE]

Todd,

Please call me asap!!!! I received your NDA order for the controller.

 

[JoshH]

B1058
B1057
B1073

Make sure the values in these cells/tables are at least 200 or higher (only the top 2 rows in B1057 need to be changed, but it won't hurt to change them all). If that doesn't fix it, you will need to play with the PID control tables.

 

[isudiesel]

Thanks for the input josh. Will this get the pressure above the controllable level for the ecm and leave the regulators wide open?

 

[redws6rocket]

had one a long time ago with to big a pulse width, knocked it down and fixed it. it was an lbz