Ok so I have recently built a 355 for my car and have been looking into turbocharging it. But before I just throw a turbo on it I was hopping some of you could help point out the flaws in my strategy because this will be my first time with a turbo build.

The motor is a 355 with port and polished vortec heads edelbrock performer intake and a Holley 750dp

Internals are a scat 9000series crank with scat forged rods and icon forged pistols 10.3:1 compression

Comp cams cam 08-503-8 with comp cams valve springs and 1.5 roller rockers

My plan is to run 10psi from a single turbo set up with a water methanol kit to keep the intake temp down .

Everyone I know says that you want to have a low compression to run a turbo but from what I have been reading around my understanding is that as long as you keep the intake temp down and the gas octane up you won't have a big problem. I do know that the lower the compression the more boost you can run but I'm only looking to go as much as 10psi for now.

If anyone could tell me if this plan is going to work or if it's going to be a complete failure? And if there are any ways I could improve it that would be great.

Thanks for the help,
Jesse

 

If this isn't a daily driver then switch to E85, I know guys running close to 11.0:1 compression with no intercooler or methanol, but running with E85 and they have no detonation at all. If you don't switch to E85 and you want to keep that static compression then your going to need plenty of methanol, or simply run race gas whenever you get the chance to fill-er-up. If I were you, I would drop compression, it's less of a headache Jesse...

 

Iron heads with 10 to one is alot more difficult. You would likely need to spray straight meth and lots of it.
E85 would be the ticket but thats rare fuel in some parts. Else run straight vp race gas 110-116

Running it on pump it would likely need to be on the fat side which methanol will do partially and alot of timing needs pulled probably 2-3 deg per psi and cold plugs

If aluminum heads id say go for it. Would be much easier

 

It's my daily driver so I would like to try and stay with pump gas. But how do iron and aluminum heads make a difference?

 

Rate of heat dissipation. Aluminum transfers heat to coolant and surroundings better than iron so the chamber temps are cooler. You almost need 1 point higher compression with aluminum versus iron to make similar power all else being equal. Because of that it would be easier to support boost at 10 to 1 comp with aluminum heads.

Thing is, if you could buy new heads you could also get larger chambers to even further reduce comp and be safe on variety of boost levels

 

I wish that was available near me. Not a station in New Hampshire, and the closest one in Massachusetts is 100 miles away.

I'd run silly boost if I could get e85 near my home.

-- Joe

 

So if I got lets say a pair of dart aluminum heads with 72cc chambers then I would be ok with running 10psi with the methanol ?

 

What is the entire combo? Piston, deck height, crank, rod, everything. Give me the numbers, and I'll give you the answer. .

-- Joe