Jwilliams04

I currently have a NA setup and decided to put S475 on it. Ditching the Fast 102 and Injectors to make up for new power. I do not want to change the cam if I dont have to. The motor is a 402 LS2 base motor with a 239/247 113 cam. Any ideas if the cam has to or needs to be changed. Plans - Remove Fast 102, Fast 46 lbs injectors and replace with 80lbs injectors, elderbrock intake and S475. Any Input would be great. First turbo setup.

Beatdown Z

iTrader: (18)

Run it and see what happens.

needaz28

iTrader: (15)

give it a shot, might like it. unless your going for a max effort setup.

87silverbullet

iTrader: (11)

There are alot more factors that need to be known about the cam before someone can tell you if it will work for a turbo setup. Also, what heads do you have. Exhaust velocity is important for a turbo setup so your cam and exhaust port have to coincide to make sure everything is happy. If it's not, you might run into spooling problems.

Jwilliams04

ZL1 manifolds, T6 with 2 1/2 hotside. S475 1.32 Ar T6. 406 with 10.5 compression and 239/247 113 cam. 3" cold side. Please chime in.

stevieturbo

If you keep it a low boost, low backpressure setup, it would probably be fine.

Otherwise, far from ideal in any book.

But will it still make power ? of course it will. Lower rpm's will probably suffer more than anything

Jwilliams04

What cam do you think for this setup. I don't have a problem changing cams just want the best.

HexenLord

If you want the "best" it'll have to be custom specced for you. No off the shelf cam is going to be JUST right.

LIL6BT

Spend the small amount for a spec'd cam. Between drivability and overall output, it will be money very well spent.

You could recoup most of the cost by selling your setup to an NA guy.

stevieturbo

What does "best" mean to you, and what sort of usage/power expectations ?

Jwilliams04

Well I'm new to turbo setup and everything I see does not have a overlap as I do currently so trying to learn and understand cams for turbo setups. Want good drivability but make great boost. The car is a street car and looking for 700-750 rwhp and after today I plan to upgrade turbo to 84mm with race cover. So what ever cam is ideal for street well manner great boost car.

mr slow

I am in the exact same boat as you, almost same cam, motor, intake setup, power hopes and everything. The only difference is I want to go with a d1sc, I would love to hear more input on this set up. My cam is 239/246 .632/.632 113+2 on LSL lobes

stevieturbo

Stick with durations in the 22x range, LSA 114+ and it will be a totally mild smooth idle cam and work great with a turbo.
That's being quite general, I'm sure others could be more specific with exact details on your setup.


What size motor ?

If 346 I'd that cam is pretty big, if 427 then it probably isnt bad at all.

Kip Fabre

There are many variables when choosing a turbo cam. 1 what static compression? 2 CI of engine? How much boost will you try to run? Turbo EX housing size? RPM range? Automatic/ Stall/ 5 speed?
Street use? Strip use? How far away are the turbos from the heads or length of EX pipes? Some turbo cams that may be for a street car would look like this IN 228 EX 222 LS 115 +5 what this does is give a normal IN closing and EX opening but cuts down on EX overlap.
The reason you make a cam like this is because on overlap around TDC if you are making lets say 20 lbs of boost on the intake side but you may have 40 lbs of EX presser on the EX side see what will happened?
This would be a Street cam no turbo IN 228 Ex 236 112 +2 IO/4 IC/ 44 EXO/52 EXC/4 Overlap 8 deg
This would be a Street turbo IN 228 EX 224 115 +5 IO/4 IC/44 EXO/52 EXC -8 Overlap -4 A cam like this will cut the EX overlap down so it can not blow back up the intake. There are may other factors when choosing a turbo cam this is just a few.
.

HexenLord

So you're going to buy a 1400 HP turbo so that you can get 700 HP?

mr slow

Its an ls3 headed 408, for N/A it works well and makes good power, just wondering how the overlap is on that cam and if it would be alright with boost. Sorry OP I just figured I could ask a few questions real quick since our builds are very similar. Not meaning to jack your thread.

Jwilliams04

Yes only wanting 750 from my setup street driven. Motor specs are below.
406 LS2 Alum Blk
10cc malhe pistons
Callies rods and crank
LS6 Stg 2.5 TSP Heads 650 lift Dual Springs, Harden push rods, titanium ret
Edelbrock HIgh Ram Intake
239/247 .624*/.624* 113LSA 112 ICL
85 lbs Fast Injectors
Aeromotive boost ref Regulator
ZL1 Manifolds
2.5 Hotside to T6
S475 T6 1.32 AR 5" DP
3" cold side
twin 44mm wastegates
RFL BOV
Twin 255 Walbro fuel Pumps
10.5 Compression
93 Pump Gas Maybe 110 If temps get high. Dont want to run Meth.
M6 T56 Tremec Twin Disc Monster LS9 Clutch and Lightend Flywheel

Tune so far with cam is smooth as can be thanks to Mike from Nola Motorsports. We couldnt completely tune this setup before since previous clutch was slipping but now new clutch is installed and just breaking it in. I plan to tune with this cam but want to have another speced ready to go if needed.

https://ls1tech.com/forums/conversio...g35-coupe.html