I did the math on the compound thing at one point, and the conclusion I came to was you need to size the turbo to the NA equivalent size boosted engine. Basically just how you size a turbo compressor based on the NA airflow you anticapate to see where it is on the compressor map, but instead of using the NA air you use the volumetric airflow from the blower.

So if you have a 350ci engine with 10psi of boost from the blower, thats roughly equivalent to a NA engine of 50% larger, so 350*1.5=525ci. Of course assuming you dont bypass the blower when the turbo comes online.

 

Ya I'm gonna try it and see what happens. I've had one other guy mention that concept to me as well for this project. But really there is a lot of power to be had from it if it works. I feel it probly has the ability to exceed the the limits of the block so this is enough for me. Also there is only a handful of people to talk to about it, none I know and I don't doubt I'd get info from them on it.

I'm gonna try it and see what happens. Punt lol. But ya I'm gonna try it. Already have almost everything to do it.

 

Truck just changed direction. Basically after hearing from a bunch of people it's too small and basically telling me "I'm doing it wrong" I've decided to sell my 408 shortblock.. I'm sending the heads to Frankenstein for more work, and repairing cylinder #6 valves. Then I'm building a 427 dart next based block like originally planned, and putting a gt55 turbo on it. I have already put the order in for the Dragonslayer crank w/ Cleveland mains, Oliver speed way billet rods, and pistons are up in the air as of yet considering a Wiseco boost piston with h13 pins. Not set on those yet but considering them. So here we go... New converter has already been ordered.

 

Is the 88mm turbo gonna be for sale?

 

Gonna see if forced inductions will swap it out, if not yes.

 

I've been working on a couple different scenarios I had originally looked at a short stroke big bore set up 4.125" X 3.625 stroke for a 388. But I decided against it for the simple fact that 427 sounds more appealing and is virtually the same cost parts wise. So here is the plan:
-Dart Next LS Block cast iron 9.240 deck
-Custom Wiseco Pistons: full round design, 2.750 long pins .225 wall h13 tool steel .927, gas ported top rings, and armor coated the whole piston roughly 15-18cc. Mexican hat style full round dish 1.115 compression height 1.5,1.5,3.0 ring pack
-Oliver speedway billet rods I may run a 6" rod in this motor to get pin out of the oil support rail but as for right now I have loosely speced 6.125 rod it may change depending on how Wiseco plans to lay the ring pack out on the piston. Also depends how hard I wanna turn it I'd like to keep it under 7500 to save the crank
Callies Dragonslayer crank I did consider going to a billet 8 counterweight billet crank and running Cleveland main bearings but haven't decided if it s worth it for my application kind of a grey area where I'll be. (Sub 2khp) def wouldn't hurt tho..


Open to any input from the big power guys.

 

I'm not a big power guy... but I just wanna step in here to say wow.

Wow.

 

They sent me some pics of the s488 getting mocked up for the down pipe.. Man it's a big bitch!
Also bought a 4.8 for 250$ Ima run the next year, has 325k miles on it I'm cam it, 243 heads, studs, file the rings back some and roll the dice.
408 is getting sold as a shortblock, heads are getting worked over by Frankenstein racing,

427 is gonna slowly get built as I can afford it this year. Just didn't want the truck to sit..

 

that turbo looks ******* badass.

I want.

 

Have you already sent the heads to Frankenstein?