How much of a gain over a NA cam. Mid sized BB 9.8comp big flowing -1s.

Way to generalized...

Im using a mp.590 cam in my sb turbo setup. 106lsa. Not optimal,but it works.


I'd say a good cam will new 40-50hp give or take.





Call bullet and see what they recommend.

Was gonna buy a Bullet, got a 660 solid roller Comp I can use just didn't know if a custom grind is worth the extra coin.

What's the lobe separation?

Can't get a very good answer without a lot more detail. How big is the motor, What turbo(s), intercooled? hot side size, power goals, rpm range, what fuel, expected boost, etc?

If you're talking about a low power level on a big turbo with good fuel... Just turn the boost up more and run a cheap cam. If it's a max effort deal then of course it will make a difference.

Single 75mm with A air to air, .030 400 forged bottom end on pump. I have Guppy's old top end, will go up to another 75mm and a 4.250 stroke and a aftermarket block after its bugged out. Wanted to buy cam just once, willing to sacrifice power now as long as it will benifit me later.

card say 108

You need to be wider on the lobe sep. At 108, it is going to blow a lot of the charge out the exhaust on overlap. The overlap is helpful to pull the intake charge into the cylinder on a N/A motor, but you don't need that with boost. Shoot for roughly 114.

Ck

Cam specs are VERY dependent on pressure ratios. A single 75 will choke that engine, and you can follow the "turbo cam" generalizations with that choice.
Point is this... The closer you can get to a 1:1 intake/ exhaust pressure ratio, the more you can let it breathe with a more "n/a" style cam.

That's a very vague statement. the right 76 will be just fine on it. A 76/96 on my 426" sb definitely isn't "choking" they engine by any means.

As straight forward and pointed as I can be. A 400 with worked over indy top end will be choked with a single.

Weird my turbo is rated to 1100-1200hp with a 1.32 exhaust housing and 96mm wheel. will it work, yes. Will it make more power on a larger turbo? I'm sure it will, but what combo wont? Plenty of low 400ci combos with a single 76 makin a$$ loads of power. High 4s and low 5s at 3200-3300lbs. Inlet wheel size is not everything. Without a compressor map for you're just using an incorrect generalization.


If you're class limited to a 76mm inlet wheel there's plenty of power to be made. But by all means go as big as youd want.





To the OP call Jose at forced inductions and he will hook you up with a nice piece.

So what kind of power is your 426 making with that single?

On 9.7lbs it went 137 @3500lbs with 26% converter slip. That's with a NA camshafT, and a baby soft tune up. It's a stock block, 100% street car. It's really going to pick up with the s476 race cover and wheel upgrade.

Why would you upgrade when you say that your single is capable of 1100 hp? You are nowhere near that by your numbers.

it's an easy 40-50 hp at the same boost level, while still being class legal 76mm in a local 8.5 tire class, which is what it's going to shape into late summer/winter.it's just a box stock t6 s475 at the moment, but it will be going to Jose for the race cover at some point Since I'll need It next year Hoping to pick up a r block or ritter block so I can crank the boost up and make it more of a max effort deaL

Still trying to wrap my head around this. Your single 76 has a claimed approx. 400 hp left in it, but you want to upgrade so that you can make 50 more HP than what you do now, because you want to stay at the same boost level? Does your class have some boost limit, or am I not getting it? Things do get by me sometimes!
My point is this. He asked about a cam. What to many people call a "turbo cam" can be good or bad for a turbo engine. An under turbo'ed combo will work fine with that style cam. Put two of those turbos on there, and the cam specs that will work with over turbo'ed engines will have specs way closer to a "N/A" cam with better results.
Trust me, I understand. The power undersized turbos will make on a car feels great... But after you put "proper" sized turbos, You will recognize the "choked" term I use.

It's non i/c at this point, so I'm hoping it's going to help with iat, even tho they aren't out if hand just yet.