LSA supercharger with N/A cam - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

DP1993 · 08-10-2023, 12:50 AM

So I got my car back The build is a TSP stage 4 F-35 cam ported heads. Headers rod mod intake. 510rwhp 460rwtq through the auto. I was curious has anyone ran a lsa supercharger or any supercharger or turbo with a big N/A CAM? If so did you have any issues?

CamaroCracka · 08-10-2023, 06:29 AM

Richard Holdener has done tons of them on his YouTube channel. He says all cams work with forced induction.

acammer · 08-11-2023, 08:48 AM

Quote:

Originally Posted by CamaroCracka

Richard Holdener has done tons of them on his YouTube channel. He says all cams work with forced induction.

They all work, but they are not all optimal. It's true, any cam can work with any configuration, it'll run and drive, and make pretty decent power. BUT, there are definitely nuances to different power adders that favor different types of camshafts. An LSA is a positive displacement supercharger, and a fairly small one at that. It makes incredible boost at modest rpm, and carries that decently to the top end, but you can only turn it so fast before it's way out of its efficiency and stops gain boost, and IATs climb.

So, what does an LSA like for camshaft - minimal overlap. Keeping the cylinder pressure in the cylinder, and not sending it out the exhaust, is critical to preserving the boost that it's capable of delivering. Intake duration can be modest, combine with a minimized overlap event that will push the intake valve close point out, which is ok as we've got pressure in the intake that will keep that port flowing and help the combo RPM. It also wants lots of exhaust duration - it's got the help of the blower to add lots of air INTO the cylinder, but it's up to the cam timing to allow all that extra charge sufficient time to evacuate before the next cycle. So, we gotta get that exhaust valve open early to help it breath and RPM well.

At GPI you'll find that our PD blower cams favor plenty of exhaust duration, while keeping overlap to a minimum, which maximizes what the airflow characteristics of a mild/moderate PD blower offers.

In the case of the OP, the F-35 has pretty significant overlap which is going to bleed off boost at lower engine speeds, negating some of the low end and mid-range torque an LSA is capable of. On a SBE high compression L99/LS3 that's not a horrible thing. It has a fairly late intake valve close point, which also will work pretty well. The biggest limiting factor is the exhaust valve open point, which is a fairly late. That's might work well for an NA combination that is never going over 7,000rpm, but it's not going to clear the cylinder well at higher engine speeds, and all the more so one you add boost. So, it will definitely work, but something like our GPI SC-STG3 camshaft would match the airflow needs of the combination a lol better, and improve the entire curve.

Centrifugal superchargers, turbochargers, and nitrous all have their preferences as well. It doesn't mean at all that you can run a less than optimal camshaft with a given setup and have BAD results, just not OPTIMAL.

Blue 13 · 08-12-2023, 09:18 AM

Andrew is absolutely correct (as usual).

Jannetty built mine with a 2.9L Whipple and his custom rough idle blower cam. An off the shelf NA cam I’m certain wouldn’t work as well or as efficiently.

silversleeper · 08-13-2023, 08:30 AM

You've already gotten great answers.
I would just emphasize a few points.
The blowers and turbos are most efficient at a certain flow and pressure.
They plot it on a "Map" that can be tricky to understand the numbers going into that but easy to see if you are in the 80% efficient or 50% efficient area of the bullseye.
I looked up the LSA blower before and it's impressive how they got it so efficient running on a stock or slightly mod engine with a little more boost.

You would be way out like 60% I think on the LSA specifically, just a guess.
Can be done but why not get the right parts to make power? Part of that is the cam. If going that route at least get a FI part that is closer to efficient.
Not mentioned is tuning can be more challenging for non-experts because so much fresh gas/oxygen mix is blown past the exhaust with your overlap.
If I did it with your cam I'd go turbo not blower.

TheFlyingBananaSS · 08-13-2023, 04:36 PM

Andrew helped me pick out my cam. I gave him the build run down and now she's running 10.7s.

08-10-2023, 12:50 AM	#1
DP1993 Drives: 2014 Camaro SS Join Date: Nov 2011 Location: Louisiana Posts: 48	LSA supercharger with N/A cam So I got my car back The build is a TSP stage 4 F-35 cam ported heads. Headers rod mod intake. 510rwhp 460rwtq through the auto. I was curious has anyone ran a lsa supercharger or any supercharger or turbo with a big N/A CAM? If so did you have any issues? Attached Images __________________ 2014 Camaro SS DOD/VVT delete TSP F-35 cam Chevy performance lifters CNC ported heads and intake Yank stall 510RWHP 460 RWTQ 2001 Firebird LS1 SLP lid SLP catback 2014 Camaro RS (SOLD) 2014 Camaro SS ( SOLD) 2013 Camaro ZL1 TSP headers Roto fab intake 515 RWHP (RIP)

08-10-2023, 06:29 AM	#2
CamaroCracka Drives: 2010 Turbo LS3 Join Date: Dec 2009 Location: Palm Bay, FL Posts: 2,736	Richard Holdener has done tons of them on his YouTube channel. He says all cams work with forced induction. __________________ 2010 SS - On3 kit with downpipe cutout, CTR 78/80, CompCam 239/251 620/632 122+4, E85, Z28 suspension and ZL1 diff with Outlaw axles. Gen6 ZL1/1LE brakes. 2011 Vert - 416/w 230/236 .612/.602 115lsa, 1LE suspension w/32mm rear bar. Z28 diff. ZL1 brakes.

08-12-2023, 09:18 AM	#4
Blue 13 3P171 USAF Combat Arms Drives: 2013 SS/RS Join Date: Jul 2021 Location: Olmsted AFB Posts: 265	Andrew is absolutely correct (as usual). Jannetty built mine with a 2.9L Whipple and his custom rough idle blower cam. An off the shelf NA cam I’m certain wouldn’t work as well or as efficiently. __________________ 416ci LS3/Vortech V7/Built 6L80 993 RWHP 781 RWTQ

08-13-2023, 04:36 PM	#6
TheFlyingBananaSS Evil Genius of Chevrolet Drives: 2017 Z06, 2019 XTS, 2013 SS Join Date: Feb 2017 Location: New York Posts: 3,260	Andrew helped me pick out my cam. I gave him the build run down and now she's running 10.7s. __________________ GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.

08-13-2023, 08:30 AM	#5
silversleeper Big Crow Drives: '13 ZL1 Join Date: Mar 2017 Location: California Posts: 1,487	You've already gotten great answers. I would just emphasize a few points. The blowers and turbos are most efficient at a certain flow and pressure. They plot it on a "Map" that can be tricky to understand the numbers going into that but easy to see if you are in the 80% efficient or 50% efficient area of the bullseye. I looked up the LSA blower before and it's impressive how they got it so efficient running on a stock or slightly mod engine with a little more boost. You would be way out like 60% I think on the LSA specifically, just a guess. Can be done but why not get the right parts to make power? Part of that is the cam. If going that route at least get a FI part that is closer to efficient. Not mentioned is tuning can be more challenging for non-experts because so much fresh gas/oxygen mix is blown past the exhaust with your overlap. If I did it with your cam I'd go turbo not blower.