05 LLY project

[11sdmax]

Yes that's right on the turbo, and the cp3 is completely stock, it seems to hold rail just fine. At this point I'll probably keep running it, maybe try an lbz cp3 if I decide to push it a little farther. And Rob does my tuning so I'm not sure about the pulse width, I basically know nothing about the tuning side of things compared to a lot of you guys. But I went to one of Zach's efi live classes at industrial awhile back and have been playing around with it since!! I'm taking it back to Boise here in a couple months when I get done with cornharvest, to do some tuning on the dyno so I will have a lot more information for you guys and some hp numbers providing it doesn't blow up before that. Not sure what it's making...its been my daily driver and work truck, but started making some pretty clean and fast passes so now it's turned into an expensive toy that I'm A little more serious about lol

 

[11sdmax]

here's a pic of the back end of things, it's got factory leaf springs with the overloads and a bottom leaf both pulled out, 3" beltech drop shackles, caltrac traction bars, rancho rs9000 adjustable shocks, factory limited slip and the PPE cover. It sits perfect and hooks hard!

 

[WVRigrat05]

Ok, I keep my truck pretty damn clean underneath, but how is yours that clean? Is that a pic after you did the frame up or you not drive it in the rain?

 

[11sdmax]

We have a lot dryer climate out here in south Idaho, It rained like once here this summer. And I usually don't take it out if it does rain. Also I'm kind of a clean freak and will probably drive this truck for the rest of my life so I try to keep it nice!!

 

[WVRigrat05]

I hand wash the underneath of mine twice a year, usually pressure wash it once to twice a month and keep wd-40 on the undercoating to keep it black and soft and touch it up as needed but I can't keep it looking that good, a week tops. Seems like all it does here is rain anymore.

 

[Josh154]

If you log it you can see what your pulse width is. That's pretty crazy though. I wish mine would hold rail lol. What's your weight? You can get a pretty good idea power wise what your putting down with those calculators.

 

[11sdmax]

I had some 16" wheels with proxes on them and it weighed 6500lb wit me in it then.
I've stripped pretty much every extra pound off of it that I can.
Haven't weighed it with the 20s but probably a little heavier now!

 

[11sdmax]

The overloads, receiver hitch, changing to a roll pan, deleting the entire sound system, passenger side battery, spare tire and jack are just a few of things that I got rid of. It all adds up. I realize it's pretty much useless for a work truck but that's not what I use it for any more. I have another truck for that. I just wana go fast in this one!:thumb:

 

[WVRigrat05]

If you log it you can see what your pulse width is. That's pretty crazy though. I wish mine would hold rail lol. What's your weight? You can get a pretty good idea power wise what your putting down with those calculators.

Mine holds higher rail
On my max effort tune then it does on the stock one. Did your truck have a lot of miles before a lift pump?

 

[11sdmax]

It had between 80 and 90,000 on it when I got it. I bought it from one of my buddys n before he got ahold of it, it was completely stock. He bought it, put a tune on it and one of the head gaskets went. So I ended up buying it from him and it kind of went from there.

 

[Josh154]

I had some 16" wheels with proxes on them and it weighed 6500lb wit me in it then.
I've stripped pretty much every extra pound off of it that I can.
Haven't weighed it with the 20s but probably a little heavier now!

I put those numbers in and it puts you right at 650 which seems about right!

Mine holds higher rail
On my max effort tune then it does on the stock one. Did your truck have a lot of miles before a lift pump?

I bought it straight pipes at 107k miles. It obviously had a tune of some sort on it, had to be efi live. It was actually pretty clean and it boogied till it dropped rail. Felt a lot like my 60hp tune. The truck didn't have a lift pump and would drop rail and give me the change fuel filter message. I'm guessing that caused my cp3 to be weak.

 

[TheBac]

625

Pretty impressive for a stock LLY longblock no matter how you slice it. Id love to see w comphat your compression numbers look like. What are your future plans?



Josh, you need to lower your pulse and timing to get rail pressure to come back up. Im going to assume you're around 31* on that 3300us tune?? Too much of both, and you're defeating yourself.
You've instead got to rethink your combination if you want to go faster.

 

[Josh154]

Not sure what my timing is. I'm not trying to run it anymore till I can get a pump. Kory has it set up so when rail starts dropping my pw goes down to around 2700 to come back. Towards the end of the track rail picks back up when it's in lower rpms. The truck was obviously ran hard with no lift pump before I got it. Nothing I can do about it now besides put a new pump on lol. Some people just get lucky and have strong trucks like this guys

 

[WVRigrat05]

My big tune is 3000-3100 us and 28 timing. It's not a max max effort but it busts a lot of ass and makes 27000+ rail pressure, it pops the fprv all the time, not hard but you feel it jerking a little, I need to shim it. I was gonna plug it but as strong as my cp3 is I don't want to risk it.

 

[IOWA LLY]

My big tune is 3000-3100 us and 28 timing. It's not a max max effort but it busts a lot of ass and makes 27000+ rail pressure, it pops the fprv all the time, not hard but you feel it jerking a little, I need to shim it. I was gonna plug it but as strong as my cp3 is I don't want to risk it.

If it was the fprv it would fall on its face when it popped. Once they pop loose they dump rail pressure down to almost nothing. (Less then 10,000 psi)

That surging your describing is from the regulator voltage table being set wrong for your truck. It's bouncing the rail pressure above and below the desired pressure.

Sent from my SM-N920V using Tapatalk

 

[11sdmax]

Any benefit in going to a modded regulator or lbz regulator on my stock cp3? Would I need to retune? I've heard of guys doing it...

 

[clrussell]

Any benefit in going to a modded regulator or lbz regulator on my stock cp3? Would I need to retune? I've heard of guys doing it...

Yes it'll require a retune. Not enough of a help imo worth the upgrade..

 

[WVRigrat05]

If it was the fprv it would fall on its face when it popped. Once they pop loose they dump rail pressure down to almost nothing. (Less then 10,000 psi)

That surging your describing is from the regulator voltage table being set wrong for your truck. It's bouncing the rail pressure above and below the desired pressure.

Sent from my SM-N920V using Tapatalk

Go figure, ****ing tunes never are right on this truck. I'm on my 8 revision.

 

[11sdmax]

Here's a couple pics of my buddy's Duramax that we've been working on, it's an 01 gmc lb7. It's leveled on H2s with 33" mts, has cognito uppers, kryptonite tie rods and straight center link.

 

[11sdmax]

It also has a stage 5 PPE trans kit in it. We've built 2 transmissions ourselves and they are working great so far!! He is also trying to make power with the stock bottom end, I'll post some pics and specs on the motor