truck info daily driver

2012 GMC Sierra 5.3 4x4 turbo
kB racing turbo kit s369
gap piston rings
ARP head/rods bolts
DW 90 injectors/e85 set up
525 walbro fuel pump
-8an feed/-6an return
3.42 gear
BTR stage 3 truck cam
3200 stall
6l80e
tune by wong performance
482hp/492tq. 11 boost

After 1+ year working on it I finally finished it well kind of I was excited and was running tranny on low fluid and burn 🔥 it 😅😅 I think that’s why my number were lil low as well. I will be upgrading turbo s4** in the future and I’m getting stage 2 tranny as well.

my goal is 650 hp to the wheel

Since my cam was for all motor should I swap it??

any recommendations on what should I swap on my truck project to reach my goal

 

What’s the specs on that cam?

 

218/224 110+0

 

ARP head studs, Flex Fuel conversion to run E85, and more boost.

 

all ready have ARP head studs. Truck is set up for e85 all ready. More Boost once I get a build drive shaft and rear end

 

I don't think the numbers are low at all, imo. I made 477 on 12lbs thru a stock exhaust (including manifolds) while
spinning a blower and 33s

I'd say you're spot on the money. E85 that nugget and give her the beans

 

If you are worried about the cam, the biggest difference between an NA cam and a turbo cam is the NA cams tend to have overlap to aid in cylinder filling at high rpm to build high rpm power. With a mild turbo setup, you don't need overlap because you have pressure (hard to avoid overlap on really big cams). Look up your cam specs at .050 lift and see how much overlap you have with your current cam, if any. If you like the powerband and there is no overlap, I don't think you will gain a lot swapping to a turbo cam unless you go bigger or higher lift. If you have a lot of overlap, then do the same investigation on a turbo cam you like to see the difference.

I have a 212/218 114 Comp Cams NA truck cam with no overlap. My LQ4 makes peak torque around 4800 rpm and I shift at 5800 because I want to keep it under 6K to avoid lifting the heads (I don't have studs yet). I wouldn't want peak torque to be much higher, unless I'm willing to spin the motor higher. Your boost curve is not flat, so your torque peak happens at low rpm because your boost pressure peaks at low rpm then falls off. With a flatter boost curve I bet you would make peak torque around 5k rpm which would be good for spinning a little over 6k rpm. An electronic boost controller could give you a flatter boost curve which will bring your upper RPM torque and HP higher. Hard to see on the dyno graph, but if you are loosing ~3psi from peak torque to peak HP, then you are leaving ~50 HP on the table from that alone.

 

The numbers are low. The 33’s and the blower hurt your numbers as you mentioned, he has neither of those going against him.

OP- what backside is on that turbo? Is that your boost curve at the bottom of the dyno? Is it peaking at 11 then falling below 9psi up top? With the specs of the cam and what I suspect is a pretty restrictive hot side, I have a feeling back pressure is choking it.

 

Speaking of back pressure....

I had a 100% stock GMT800 exhaust when I made 477. Cats included

Admittedly I don't know the OPs exhaust setup, but I know he has at least 1 replacement manifold and a downpipe that eliminates cats

I guess I also don't know how much power is expected, but seems like it's not that low, again: my opinion only based on my own dyno experience with a truck