Turbo Help

[Grimace]

I wanna building a turbo sbc!!!!! Its goin to be a street/strip car! I dont know much about turbos!! Whats better for my set up twins or single! HELP

Its a 355 SBC

these internals:

http://store.summitracing.com/partdetail.asp?part=SUM%2DSBCKIT1%2D300&FROM=MG

other than

Stock Crank

Stock Rods

These Heads:

http://store.summitracing.com/partdetail.asp?autofilter=1&part=WRL%2D042670%2D1&N=700+400240+4294867081+4294784400+4294840140+115&autoview=sku


I dont know what to do for a cam, intake ,& carb.. If you see something i should change let me know.

[olds48]

What will your compression ratio be?

[lookingaround]

what kind of boost you planning on running? i think id change the rods and pistons if it were me. i dont think stock parts would hold up to long.

[us7race]

I think the twin turbo would make too much power for a stock crank and rods...I have seen a single turbo setup run 5.66 in the 1/8th with a stock 400sbc block (aftermarket internals) didn't make too many passes and split the block in half. You could play with a single turbo for awhile if RPM's were kept down.. Just my opinion. Turbo's are the way to go as far as HP but the cost is outragous.

[Grimace]

I know alot of import guys and they are all switching from twins to one BIG single! Whats better for the track? 9 to 1 and boosting @ 5 to 8 psi!

[olds48]

I know very little about turbos,but have read alot about them concerning diesel trucks.Far as I can tell,the idea with them is a 2 stage turbo.One smaller one to help spool up quicker and then a larger one to carry it out with the upper rpms,when you need more airflow.I wouls think that a twin turbo would probably be better.2 small ones that spool up quick,bit together can move some serious air.Of course two cocts more than one.A guy at my track has a 302 fox body Mustang and he adapted a Ford 7.3L Powerstroke turbo to his.HE LITERALLY USES A COFFEE CAN FOR THE AIR BONNET :shock: .I looks crude buy he runs low 6s.And that truck turbo really screams.It is awesome.For the track,with a loose converter,I'd say one biggun.For the street,I'd say stay small.Just my $.02

[OneBadGMC]

I wanna building a turbo sbc!!!!! Its goin to be a street/strip car! I dont know much about turbos!! Whats better for my set up twins or single! HELP

Its a 355 SBC

these internals:

http://store.summitracing.com/partdetail.asp?part=SUM%2DSBCKIT1%2D300&FROM=MG

other than

Stock Crank

Stock Rods

These Heads:

http://store.summitracing.com/partdetail.asp?autofilter=1&part=WRL%2D042670%2D1&N=700+400240+4294867081+4294784400+4294840140+115&autoview=sku


I dont know what to do for a cam, intake ,& carb.. If you see something i should change let me know.

You just want to build one to say you did it, or do you actually want it to run like it has a turbo?

If it runs like it has a turbo with those parts, it won't run long.

[feenst]

Twins should build boost quicker.
A single should maintain the boost better on gear changes.
I personally like twins because they simplify the plumbing on a V-8.
Check out ebay for cheap twin turbo kits that will make the kind of boost you're looking for.

[Grimace]

Car Craft had Marty Stromberger's stock-block SBC, twin-turbo 1988 Pontiac Firebird GTA . See "Hard Core, in the November 2007 Car Craft at pp. 76-80. Its went 9.75 at 141 with an ancient, used, 150,000-mile two-bolt/cast crank short-block and crappy 487X heads ." Thats what gave me the idea! Im not lookin to go that fast i just want to run some mid 11s!

[Grimace]

Thanks for all the comments! What will be good size turbos to go with? Like i said its just goin to be a street/trip car low to mid 11s would be ideal!

[Racefab57]

SINGLE TUBRO!!!!!!!!!!!!!!!!!!!!! David. Its strip/STREET.

[CrossRacingProducts]

I would think twice about the stock internal parts. If the money is there, I would even think about an aftermarket block too.

If you really want to run all of the OEM parts then go with a single turbo and keep the boost light.

[Grimace]

If i change to the rods below would that be better for the bottom end they are forged? Should i also change the crank? its goin to be a low compression engine.

http://store.summitracing.com/partdetail.asp?part=SCA%2D25700&autoview=sku

What about this Crank?

http://store.summitracing.com/partdetail.asp?part=SCA%2D910526&autoview=sku

[OneBadGMC]

If i change to the rods below would that be better for the bottom end they are forged? Should i also change the crank? its goin to be a low compression engine.

http://store.summitracing.com/partdetail.asp?part=SCA%2D25700&autoview=sku

What about this Crank?

http://store.summitracing.com/partdetail.asp?part=SCA%2D910526&autoview=sku

Cast cranks will kaboom with more than about 7 PSI of boost.

The rods you picked out are bottom of the barrel. You may as well be running bone stock rods. LT1 'pink' rods may even be a step up.

For the mild application you're wanting, buy Eagle brand.

You can find decent brand new Eagle rods right here on RJ for about 300.00.

Crank must be forged for it to live.

Save your pennies and do it right, or do it cheap and do it twice!

[Grimace]

I know i sound really cheap! Im tryin to put together a decent engine on a small budget! thanks for all the help! is this a upgrade from the other rods

http://store.summitracing.com/partdetail.asp?part=ESP%2D5700BPLW&autoview=sku

so a forged crank is the way to go! Wow they are crazy expensive the kinda of money im spending here should have me in the 10s on motor!

[hammertime]

I know i sound really cheap! Im tryin to put together a decent engine on a small budget! thanks for all the help! is this a upgrade from the other rods

http://store.summitracing.com/partdetail.asp?part=ESP%2D5700BPLW&autoview=sku

so a forged crank is the way to go! Wow they are crazy expensive the kinda of money im spending here should have me in the 10s on motor!

IMO Them rods are worse then the other Summit Rods, the others are atleast 4340 these are 5140. A discussion on a budget minded rod has been talked about on another site, sounded like the first Summit Rods you have arent that bad of a rod. Several of the guys used them, one had them in his 555 bbc that made 940hp on the dyno. I like eagle stuff, but any rod I buy I upgrade the rod bolts. I would not buy a cast crank, like mentioned above your asking for trouble.

[OneBadGMC]

I know i sound really cheap! Im tryin to put together a decent engine on a small budget! thanks for all the help! is this a upgrade from the other rods

http://store.summitracing.com/partdetail.asp?part=ESP%2D5700BPLW&autoview=sku

so a forged crank is the way to go! Wow they are crazy expensive the kinda of money im spending here should have me in the 10s on motor!

The lower end has nothing to do with how much power you're going to make. The top end of the motor determines that.

The lower end quality determines whether you make it down the track without needing a tow back. It does no good to make 1000 HP if it only stays together for 2 seconds after you whack the throttle.

[Grimace]

Alright Im go to strenghen the bottom end with all forged parts! any recommendations for rods and crank? And still i need help with what size turbos to go with to get to my goal!

[OneBadGMC]

Alright Im go to strenghen the bottom end with all forged parts! any recommendations for rods and crank? And still i need help with what size turbos to go with to get to my goal!

For your budget application, stick with Eagle or Manley.

For the turbo, there's tons of people out there who specialize in them. Dan Saitz has a great reputation in St. Louis. http://www.hyperformanceracing.com/

[Grimace]

Does anyone make a single turbo kit for a sbc! i have been seaching an i have not found anythin for a first gen sbc other than the sts

[v8Fiero]

you might have to make your own, are you going to convert to EFI or stay carbed? if carbed, you will need a custom blow thru carb for your application depending on engine size and final boost psi.

what is your budget? and what is your final goal for the car? (mainly street, street/strip, drag only, weekend cruiser, show car, etc?)

this is why I like nitrous instead... simple, cheap, fast.

[Grimace]

Im goin with a CSU i found a twin set that i going to convert to single! im tryin to make it a mid 11 sec car, its goin in fox body. Street/strip but mostly strip! i was goin to make it a nitrous motor but it get expensive refillin the bottle!

[Grimace]

Any ideas!