Project Red Headed Screamer: Destroked 6.0, 333ci 12.5:1, twin 6468s, faceplated T56
11-22-2012, 03:28 AM
#104
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do you think the pt88 is a lil too big for this motor? With a some what smaller turbo, you could have more torque down low... Still, nice numbers. Good job on this build.
11-22-2012, 07:16 AM
#105
I don't have a log of the boost curve, but I have a video watching the boost gauge I can put up later. It only had a 9psi spring in it, so with the wastegate not controlling boost, it just ramped upto 20 slowly. If it was making 20 psi right away like it should, the graph would look a lot better in the mid range.
The only limiting factors holding me from turning it much higher are the morel hyd lifters, and springs with 195 seat, 490 open. So how ever high they will go and keep the hollow stem LS3 valves in control. I don't think I will have a problem turning 8000 though.
No more than 22psi on the street at the most. I would be afraid to push the LS3 heads any farther. I will end up getting some better heads someday I imagine. But they will be just fine for now, can't afford to spend more on the engine for a while anyways. Keeping the 4.11s in the rear and I'll see how they do, I can cross the 1/4 at upto 8k if needed . Eventually might go to around a 3.55-3.73.
The only limiting factors holding me from turning it much higher are the morel hyd lifters, and springs with 195 seat, 490 open. So how ever high they will go and keep the hollow stem LS3 valves in control. I don't think I will have a problem turning 8000 though.
No more than 22psi on the street at the most. I would be afraid to push the LS3 heads any farther. I will end up getting some better heads someday I imagine. But they will be just fine for now, can't afford to spend more on the engine for a while anyways. Keeping the 4.11s in the rear and I'll see how they do, I can cross the 1/4 at upto 8k if needed . Eventually might go to around a 3.55-3.73.
Last edited by Jakson; 11-22-2012 at 07:47 AM.
11-22-2012, 07:33 AM
#106
Eh, something is not right, should be spooling that turbo a good bit quicker I think. As he said, maybe the gate. Heck if you look back to the 4.8 liter with twin 76mm it was pretty well spooled by 5000 rpms. I can't imagine that this motor will not be close to that.
11-24-2012, 05:28 PM
#110
Hehehehe, here we go again. Just because "your junk" couldn't do it now you have to ride someone elses nut sack once again 
. Awesome numbers for sure but like i said it is not as easy getting it to the ground. Not taking away from this project one bit, contrats on your numbers for sure 
. Awesome numbers for sure but like i said it is not as easy getting it to the ground. Not taking away from this project one bit, contrats on your numbers for sure
11-24-2012, 06:45 PM
#111
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There's some pretty nifty Minnesota cars up in hurr.
It's cool to see something different. In this case, I don't know that I've ever seen a 5.3 done in this way. That's pretty damn sweet!
It's cool to see something different. In this case, I don't know that I've ever seen a 5.3 done in this way. That's pretty damn sweet!
Last edited by DavidPHumes; 11-24-2012 at 06:53 PM.
11-26-2012, 06:03 PM
#115
Thanks for the kind words! Hahah, I don't plan on setting the world on fire running down the strip, that's for sure! Eventually, it will turn into more of a race car, but it's 95% street for now. I will have my hands full rowing gears down the 1320 with no exotic suspension parts to speak of, under my full weight pig of a car. Definitely not going to claim that its going to run high 9s right away either, but it sure would be fun. 
