Hey guys. Finally got some motivation to work on my truck, ditched the compound setup and back to a single set up and manual swap! Looking for some suggestions for a turbo 4.8L with a manual 6 speed. Its not a DD, but will primarily drive the truck on the street, occasionally at the track, and not scared of shifting it at 7500rpm. Current cam is a isky triple 12: 212/212 on 112LSA+2 .561/.561 lift that has been in there for 10 years. Lets just say that I'll stay with pump gas and 13psi (may eventually go up to 20psi). Its already torn apart so figured I'd see if any of the cam experts think there's a significant benefit going to a different cam. Thank you for the help!

Set up specs:
- 2003 Sierra RCSB weighing around 4000lbs
- 4.11 rear gears
- TR6060 out of a 2010 Camaro SS
- Trick Turbo Divided T6 Manifold
- Quick Spool Valve
- S480/96 1.32 a/r
- TBSS intake

 

You'd probably see some gains but very slight ones. I would consider reaching out to a few cam gurus to get their thoughts on the matter.

 

If I have a different style setup like that I call cam motion and tell them all the details and they send me a cam. haven't been disappointed yet. ​​​​​​​just finished a 330" 5.3 for a infiniti g35 with a S476 , tr6060 and they send me a reverse split for the High rpms autocross style racing my buddy wants to do with the car.

 

I've never had a boosted manual vehicle before so I feel like I don't even know what to ask for. But yes will get in touch with some companies if I come up empty on the forums.

 

Call cam motion and tell them your details. They won't steer you wrong. I order about 12 cams a month from them and most are custom grinds.

 

i've got a 475/96 on a 1.15 AR for my 408 cummins (as the compound atmosphere with the stock HE351VE) and a stick trans. i feel like you'll want a tighter AR with that little motor unless you only want boost on the top end.

 

Zebra, agree with your logic and the quick spool valve is my attempt to spool this big of a turbo sooner in the rpm range. Initially, the quick spool valve diverts all exhaust gas through a single volute of the divided turbine housing and begins opening up the diverter valve / flap (allowing exhaust gas to go into the second volute) via a boost referenced actuator as the turbo comes on board and starts producing. In theory, the rough effect or impact of the quick spool valve is that the s480/96 has a variable A/R (from 0.66 to 1.32) throughout the boost curve, but we'll have to see how effective it actually is.

 

hmm... mine's fixed, so i wasn't aware of that design or how it worked.
so for my curiosity, does it essentially force all the exhaust through half the flange volume (resulting in higher velocity/pressure to spin the turbine wheel) and then open it up to the full T6 size (reducing back pressure & EGT) as the turbo starts pushing enough air to open the block-off valve?

 

Yes Sir! You got it - that's how it works. I excited to try it out. Here's pics of the qsv.