dhdenney

iTrader: (53)

What works the best with a turbo? I was wanting to go iron block for durability anyway so might as well do a 408ci. But does the stock displacement work better for a turbo since a turbo makes a lot of torque anyway?

Texas Terminator

there's no substitute for cubic inches.

MYTURBOT/A

Right now stock cubes seem to be working the best. Look at all the top FI guys there all running pretty close to stock cubes. I might be wrong but i believe even rob raymer made pretty close to the same power with his 404ci as he did with his 346ci. I`d say stay under 380ci and use the 6.0 iron block and just beef the he!! out of it.

MIGHTYMOUSE

iTrader: (59)

factory heads lift at the same cyl pressure (torque) no matter what size holes are underneath it. thats my o.

Phate

iTrader: (2)

Rob never dynoed or ran the 404ci motor at the track, all he did was break it in. We will see what that 404 motor will do behind my Incon Stage II kit and a TH400 here in a few weeks.

I'll let you know how it goes!

Scott

smokinHawk

iTrader: (48)

it seems that most turbo/supercharger guys are doing better with built 346-348 motors
we have y2khawk, Rob R, mightymouse, prostock John, Twntrbce, Scottws6, nbmws6 all making big numbers using stock displacement.
all of them are using the aluminum block too except nbmws6

andy98Z

iTrader: (4)

Bigger displacements make more power at less boost. And if your boost is lower you wont need as high octane.

dhdenney

iTrader: (53)

It's all hypothetical at this point. I gotta pay off the LT1 first. What would one think would be the max boost with pump gas on 8-8.5:1?

Pro Stock John

iTrader: (34)

More cubes = bigger pump = more horsepower/torque = ability to lower compression due to increased horsepower/torque.

I think an 8:1 408ci 6.0-based engine could do 700rwhp on pump gas. Maybe more.

I elected to go with a stock cube 348ci LS6 block + 6.0 heads because I wanted to remove the weight of my old 422ci NA motor AND I wanted to see what a stock block could make powerwise. I'm using 110 leaded right now on the dyno. (VP C12). I also did not want a stroker. I'd be willing to do a 6.0 aluminum block 4.030 bore + stock crank but that would be like a 377ci or something.

Excal

the camaro that ended up with the t-88 and had big CI made similar power to the stock cubic inch and smaller turbo no?

in THEORY the more the better...in execution with turbos there's no real need. CI is not limiting anyone here.

ci doesn't limit 3.0L nissan 6 cyls from 1000 flywheel, so a 5.7 is more than enough.

smokinHawk

iTrader: (48)

it would help spool time though

i might do a 4.0-4.1" bore motor some time but im going with the stock cubes for now.

Jammer

iTrader: (1)

Im just waiting on delivery of my 409 iron to see how it likes twins.... Most turbos seem to be stock cubes now but as a season or two passes and I think this will change.

BOO HOO BRIAN

iTrader: (-10)

More cubes = better spoolup
For example, a stock cube car with twin 66's has a dyno graph that looks like a supras, NOTHING until 5000 rpm . It makes big dyno numbers but cant do anything at the track.
BUT, A 409 with twin 66's better be pointed straight at 3000 rpm.
Remember that Jason.

MYTURBOT/A

Well I don`t agree with that. Harlens running stock cubes with T66s and he`s not having problems spooling. If you set up the turbo combination correctly you can spool a set of t76s by 3500rpm. It`s all proper matching of the exhaust piping, Turbine housing A/R and exhaust wheels.

black_z

iTrader: (4)

You can always spray to help out with spooling.

turbo'd stang

Agree with you. How are Mustangs running 331-347ci motors with 106mm turbos? Its in the converter, boost controller, tune, etc... With the correct parts, you can leave the line with as much boost as you want.

BOO HOO BRIAN

iTrader: (-10)

Please read my statement again. It doesnt make any power ie boost before 4000 rpm. You could spool a pair of 76s, you are correct. As long as you have a .48 a/r it will happen. But dont expect to make any more power after 6000 rpm.


And if you need n20 too spool, the combo is a little off.

I think once the head lifting problem is fixed , and the ls1 can run in the 25 psi level, you will see some HUGE power levels. I would love to see a 101 single turbo car at one of the events this year.


I can promice you....a small block ford with a 106 cannot spool on motor alone. A 2 step is required and tons of addtional support.

Jammer

iTrader: (1)

Well, I can prove half your statement correct once that iron arrives! As far as pointing strait at 3000, I may still be stitting on the line at 3000... wonder if my 3500 stall is gonna give me traction issues

I always liked INTIMAD8's burnout...you know the 1000 foot one (minor exaggeration)

LiquidSnake

Stock bottom end 346 ci with heads&Cam&Ati@8 psi is very sweet but the new Thunderracing C5R based 427 ci&heads&cam&the same Ati barely sees the 6 psi is insane!I mean it's a lot different animal.

Chicago Crew UnderBoss

iTrader: (1)

What are you smoking bro, Stocked Cubed LS1/6 f-body and vettes are running well into the 9s (and a coule in the 8s) with forged stocked cubed Ls motors and centrifugal superchargers, twin turbos and even single turbos. They run with the big boy (bigger cubed LS powered f/i motors) all day long down the 1320.

Here is a perfect example of a vette running 9.49 at 142 mph with a forged little old 346 LS motor and F1 Procharger. Now don't tell me that's not performing at the track!

http://forums.corvetteforum.com/show....php?t=2129919

They might not have the stop light to stop light torque down low like the big cubed motors but ***** out down the 1/4 miles stock cubed forged LS motor with power adders run with the big boys all day long!