dasorcha21

iTrader: (6)

error

98transguy

iTrader: (7)

u are going to be having quite a hard time making 900+ rwhp on a 347 with single turbo that size and and auto trans that is a daily driver.Why do u need so much power on the street anyways?

deuce_454

why have you decided to build a 347? class rules?? you should always build as large a displacement engine as budget allows, and a 4inch+ bore motor with forged internals will cost exactly the same to build as a 3.9 inch bore... only difference is that you are limiting your power and having to run more boost to get the same airflow thru the engine...

Louis

iTrader: (7)

I Dont think a TC78 will support that power through an auto. I have a 402 pushing a PT88, and I feel I will be out of turbo around 875-1000 through the auto depending on the drivetrain I end up with.

engineermike

True, the 78 won't make it there through an auto. I'd venture to say it would be tough even with a T88.

2nd go round

iTrader: (1)

im building kinda the same setup 347 with a tc78 hoping to make around 700hp its gona be hard to make that kind of hp through a auto. im going to run a th400 but still looking for a converter and gears.

Louis

iTrader: (7)

Fireball and The beautiful orange TA ( with the big Tnetics and split down pipe) only made mid to high 12s to the tires on kill with MUCH bigger turbos and more cubes.

I still do not think that people realize how much power 800, 900, or 1000 really is. Thats a lot of power. Its easy to throw it around and talk about a unicorn setup, but until you actually wheel a 1000 rwhp car, you have no idea how fast it really is.

Vindicated346

iTrader: (1)

I would think that it would take something like a 91 or even a 101mm turbo for that power level on those cubes, and by the time you got it there that turbo would take way to long to spool up on such a small motor..and through an auto, i hope its not a 4l60, better be an A3 or 4l80e job for that much power

MY99TAWS6

iTrader: (3)

Agreed not very reasonable goals. Bigger cubes would make it much easier to do. And make the car much more driveable if you are not trying to build a pure race car.
370 iron block with forged pistons and rods can take some big power.
I am going with think Yank PY3400 E for my build with a stage 5 FLT 4l80e. Doubtful you can get any 4l60 to handle the power you mentioned.
Twins could get your power levels much easier. Or you could add some spray on top of the boost.
I can vouch for the fact that even 600 rwhp is a handful in these cars. Our f bodies unlike the vettes have lousy traction control setups and no active handling . I am looking to install a variable racelogic traction control in my car and for sure to hook big power you will need some big drag radials ,nittos seeing some guys saying they work and some they don't. My current nittos don't work but they are pretty worn down and roads were cold when finished up my 408 and kit install. And only running around 650 rwhp right now to break in motor and few other reasons.

1000rwhp is certainly not very useful on the street although of course it sounds impressive and even at the track might not be able to put the power down.
Tracks of course NHRA require a lot of stuff under 10.0 like full cage setup, and then big faster you need even more stuff, making the car not very streetable anymore.

You might want to go twin turbo with smaller turbos to make the car better on the street and still make some good power. Or go lower on your power goals and again have a better street power band. A car that spools up at 5000 and redlines at say 7000 is not a great street powerband. Rather have one that spools up at 3000 and redlines at 7000.
My current build has a great powerband.Very streetable.

TurboAv

iTrader: (6)

Plus at that power level you are looking at possibly having to change out the head gaskets constantly. I have an 05 GTO that I plan on putting a iron forged 370 with a TC78 turbo through my TH400. I want to make as much power as I can reliably without having to tinker with crap and change head gaskets. If that's only 600-700rwhp, so be it. I don't want a maintenence nightmare.

dasorcha21

iTrader: (6)

error

TurboAv

iTrader: (6)

What was told to me by one of the sponsors is that for a street/track car the TC78 will spool about 1000rpm faster and be way more responsive. For an all out track only car the PT88 is a good choice. The local tuner here in Phoenix, NicD, has a turbo Camaro with a TC76 that makes killer power, runs 9's, and he's had the motor together and beaten on it for 4 years with no issues on a LS1 aluminum block no less. Click on the first vid. 9.47 at 143 on 15.5psi with his 347 TC76 through a TH400.

http://gonicd.com/camaroindex.html

navymitch12

iTrader: (1)

what is the short block? at those power levels in a 347 your gonna need 6bolt heads to keep the heads down.

dasorcha21

iTrader: (6)

1/2 arp studs, and o-ring block diamond boost pistons

Cmarsh

pte88 seems to max out around 1000rwhp behind a stick on a 347-355 ci motor. With an auto, prob 900-950 rwhp with everything setup right

code4

iTrader: (30)

I just conentrated on what numbers (time) i wanted to run, i wasn't concerned with dyno numbers. a nine second car on the street is pretty wild IMO.

dasorcha21

iTrader: (6)

yes i do understand this but i would think as far as my very low gear coupled with an auto and a 3600 stall would make spoolin a pte88 much easier

Photochop

iTrader: (74)

What year is the car? Theres tons of factors, but in a perfect world - if you tune it to run 101 or higher octane gas (more timing in it), boost around 18spi (99+ PCM or aftermarket) while attempting to keep the heads down, pick up a th400 with suitable rear-gearing, dial in your suspension, and drop a little weight (3300 or less race weight). I'd say at least 650rwhp through the th400 is do-able with that setup when its all said and done and 9s shouldn't be a problem at all.

Anymore than 850 flywheel hp is alot for a lil 347 with small bore type heads on it.

If I were you, I'd build a 370 instead, use the same turbo, get some better heads that will likely stay down better; and make more power at the same boost level with better heads/more cubes.

DrTurbo

iTrader: (3)

If you want to make that kind of power on a consistent basis, not pushing the turbo to the max doing it every time, you will need a 91mm....period. 88 will do it, but your pushing it a good bit. 91's will do 1000rwhp and still have plenty of room to go beyond. Also the GT55 is by far the best unit for quick spool and making that level of power. Another good unit is a Y2K-91 as well.

98transguy

iTrader: (7)

my car made a lil over 920rwhp through 383 with an s-91 in front of 4l80e and 9" rear with 3.70 gears.However my car was out of steam at around 5700 rpm as my setup is far from optimum(baby cam , small afr 205 heads)