Currently have a forged LS3 11:1 compression in my 6000 lb truck. 6l80 built with zl1 converter and 4.10 gears on 33’s (4wd). Running a TSP stage 1 L92 cam - 216/228 .600 and 113 lsa. Running dual btr springs but will be switching to .625 bee hives.

When I had my lighter wheels and 31’s the cam and converter were not bad but you could tell it wanted a higher stall. Now it seems like I’m always on the throttle under 3500 rpm to get it moving. I was having issues with the 1-7/8 long tubes and moved to 1-3/4 short tubes which I know didn’t help.

Now I have a 78/75 Turbonetics from their TNX c15 line. I plan to run it with the Huron t4 kit and 3” dp to 3.5” exhaust.

Planning 8-12 lbs boost with Bosch 210 injectors and 525 pump return system.

Should I swap the cam out for a lower duration to be more dd friendly but worried about DCR on 93.
I’m looking at the below cams.

GT2-3
SDPC LS6 powermax
Cammotion 206/210
BTR Truck Norris (doubtful of this one)
Open to recommendations

 

I think your concerns are valid on 93 octane, in a heavy truck with low stall, I'd try to lower SCR (maybe soften the chambers) and/or pick a cam that will also lower DCR by closing the intake valve later. Something like at 114 LSA cam with 114 ICL etc, but I have not run the numbers. Also not sure why you would want 210 injectors on that as they will be under 50% duty cycle.

 

Local kit I’m purchasing they have those with the new kit. I was planning to run deka 80# which would be 96# at my flow rate but got these on a good deal. Current cam is a 113lsa. Really want to help the low end torque but I don’t want to hurt the dcr too bad.

 

I would do a straight-iah pattern cam like 218/218 or 220/220 on like a 113-114. You can play with the lsa to get the dcr where you want it, can also retard the cam if need be. Turbos are not necessary in love with more exh duration, I would do a max 6 deg split, like a Summit ghost cam or similar. Exhaust needs to be bigger,, both downpipe and tailpipe. I'm building a 4un single system for my TBSS now and I'm NA. Single 4in on yours would help light the turbo and move the powerband down some.

 

I just don’t want to go too large on intake and exhaust. Right now it feels gutless under 3500 then screams. I want some more power under the curve. I was even looking at the cam motion 206/210 115+5 but was worried with dcr. Even with ls3 heads and the exhaust flow it’s better to go with a low split with the turbo?

I’ll be running a .96ar and 3” dp to 3.5” straight exhaust.

 

Current cam seems fine, but a lot of the weaker low end might just the the heads also, possibly a mixture of both. I think a lot of what you are after in the low end will end up causing it to detonate more down low unless you can switch to e85 etc? At the low boost you are running I think a g42 7375 might spool a bit better than the Turbonetics, but that might be splitting hairs.

 

Yea I’m worried if I go any lower on a cam it will raise the dcr too much since my scr is 11:1. I may just stick with the current cam. I have the option locally to grab a gen 1 cea precision 7675 or keep the tnx c15 7875. Both are are .96ar.

 

I think those will act the same basically with the PTE being a bit stronger when maxed. What about using meth injection if you can't run e85, or do you not want to add the extra bs? I guess you could try some of the lower end cams and if you can control boost better, but in reality that turbo will probably not be building a ton of boost under 3000-3500 anyway, but if you can control it electronically and ramp it in later that might help also. For the most part you just want more NA power off the line and don't want to increase the stall speed so you need to go to a smaller cam as I think that is wise given the specs of the truck.

 

Yea I might tow occasionally with it so I don’t want to go with a 3k+ stall. I’m sure the zl1 in my heavy truck is around 2200-2400. I’m leaning towards a Howard’s 210/214 .595 114/110. I don’t want to go too much smaller and raise up dcr like crazy. I’m sure I’ll run meth just to be safe. E85 occasionally is possible just a little trip to get it then the mpg hit.