LB7: Big Tune Shorten Injector Life?

[02CCSB]

Here's the story, truck is an LB7, the injectors were new approx 10,000 miles ago.

I do have a habit of dailying the truck on a tune that laid down 540/976 with a slipping TQ.

I kept hearing a funny tick & thought it was the ATS manifolds leaking, but it seemed intermittent. Threw the scan tool on it today and found that the #7 injector was +4 on the balance rates.

The rest were at +/- -1.5 to +2.

Now the deal is that this is a stock CP3/stock injector truck. I'm starting to think that the big tune - 3750PW may be hurting them?

Given that the bodies are new, I'm considering throwing just a set of new 15% over nozzles on them and replacing that #7.

I don't plan on going bigger power or tune wise, it's still a daily truck and is hard enough to pull down from speed in traffic.

Thoughts? Feedback?

 

[chevyburnout1]

3750us for pulse?? That sounds way too high.

 

[TROJAN366]

Go bigger than 15% Leaves no room to grow. I made that mistake. Do a 40% over then you can back the PW down for now and bump it up if you get more air to it.

 

[Chevy1925]

3750us for pulse?? That sounds way too high.

Holy hell! he cant be serious

 

[paint94979]

maybe 2750?

 

[02CCSB]

 

[Janimal444]

Go bigger than 15% Leaves no room to grow. I made that mistake. Do a 40% over then you can back the PW down for now and bump it up if you get more air to it.

X2, 15% would be a waste, go at least 40%.

 

[JustinD]

3750

 

[WisconsinHick1]

3750

My thoughts exactly!

 

[JoshH]

Is anyone else seeing something saying image not available in about 8 different languages?

And 3750 pulse width is crazy high unless you are making a smoke tune...

 

[WisconsinHick1]

I am.

 

[02CCSB]

That is the max effort tune, it's written by a rather large name tuner.

 

[JoshH]

That is the max effort tune, it's written by a rather large name tuner.

Where are you looking that you see 3750? That is way too much pulse width for a stock fuel system to hold rail pressure with, and if you have a modified CP3 or duals that can hold rail pressure, you need bigger injectors. That's way too much pulse width.

 

[Chevy1925]

Where are you looking that you see 3750? That is way too much pulse width for a stock fuel system to hold rail pressure with, and if you have a modified CP3 or duals that can hold rail pressure, you need bigger injectors. That's way too much pulse width.

he must be lookin on the wrong side of the table

 

[Redbowties88]

he must be lookin on the wrong side of the table

x2.


FWIW, I run my biggest tune all day every day. Injectors are fine...tires?..well not so much.

 

[paint94979]

he must be lookin on the wrong side of the table

Ya that's my guess... No way a stock truck like that would make 540hp on 3750 pw. He is looking at the bottom left

 

[Dan@PPE]

No way he is serious about the 3750us pulse. The engine would have a VERY short life at that much pulse. Can you imagine the amount of timing NEEDED to to run 3750???

 

[paint94979]

No way he is serious about the 3750us pulse. The engine would have a VERY short life at that much pulse. Can you imagine the amount of timing NEEDED to to run 3750???

Pat may know

 

[02CCSB]

Here, I uploaded the screenshot to my own website:

 

[02CCSB]

The truck laid down 540/976 with the converter slipping 300RPM as soon as the turbo lit, stock injectors, stock CP3, AirDog II DF165 set at 12psi, S364 at 38psi.