ABeasst

iTrader: (5)

you're more likely to get help if you start your own thread. not trying to be mean just honest

Mr. Axe

iTrader: (1)

I'm sure GT55 is big enough, but I couldn't find any info on that turbo.
The only turbo bigger then the GT42 I could find info on was the GT60.

So any info on GT55 or the GT47 is appreciated.

I know that I could get a cheaper engine then the 430, but when I first put so much $$$ into the car why not go all the way. In my past experience it is better to do right the first time than building a small engine now and then wanting to go bigger later.

Thanks,
Michael

Mr. Axe

iTrader: (1)

If that was a suggestion for my setup -that is not going to happen.
If you knew the types of weather we get here in Norway you'd know it is best to keep all the parts you can inside the car.

Thanks,
Michael

ABeasst

iTrader: (5)

you can do things right with a 370 or 408. a bigger motor just means a bigger turbo. You can make just as much power with a smaller motor and a smaller turbo plus if would make everything easier, but in the end obviously its up to you. I'm just trying to help you out. Why spend 10K when 8K (just an example) will get you the same place.

Mr. Axe

iTrader: (1)

Thanks for all the suggestions.

My original question was not what setup I should go with, but if I will "hurt the 346 engine if I were to mount a big turbo like the GT55 or the GT60 on it.

As I said before I want to use this year to make all the plumbing and stuff for the turbo and then just drop in the new block when I get the money next year.

Thanks,
Michael

bigturboz28

Putting the GT60 on the 346 will only cost you weight and MAYBE a little exhaust restriction, but other then that, it will not hurt the engine.

Mr. Axe

iTrader: (1)

OK. Thanks.

Now for my next question: Will the 346 manage to build any boost at all without spinning the engine past 6800 rpm??

Thanks,
Michael

smokinHawk

iTrader: (48)

ya you might start making boost at readline :LOL
putting a turbo that is to big to make use of is total rice, might as well put a NOS bottle in that back to and never hook it up, its just wastefull.

why not just get one of those turbo wistles for your exhuast, alot cheaper and makes that whining sound.....

Mr. Axe

iTrader: (1)

Did you read the whole tread????
Only reason I'm putting the big GT60 on a 346 is becouse then I could get everythig ready and still drive the car before I get the 430 engine.
So you must really excuse me if that sounds to stupid.

Thanks,
Michael

Spenser309

hey, that engine needs more than a 430 id see if you could get one of thoose new warhawk blocks and do 500ci. My opinion.

and slowhawk, come on man, thats like saying a car with a 300hp buying a 1000hp fuel system for future mods is rice.

Hi-Flo Turbo Inc.

iTrader: (1)

I have a GT-55 on a 3.0L motor. I spool it with a 125 shot. Off nitrous it spools up at about 6700 rpm. I shift at 9600. I wouldn't be afraid of spooling a GT-60 on a 346" motor. Spray it. I just hope you know what 1500 RWHP feels like and how absolutely and utterly useless it is on any non prepped surface with any tire at any speed. I spin my slicks at 140 mph on a concrete highway at just 1250 RWHP. I stick shift car will transfer even more torque. Be very careful. You will not have fun with it, it will be very useless. I lose to a stock C5 on the highway from 80 mph roll ons if my boost is turned up to high. Over 1000 RWHP is uselss until well over 100 mph.

Pro Stock John

iTrader: (34)

I had shop folks steering me away from the 91mm turbo on a 346. I'm sure that GT60 will not drive well on a 346ci.

But with a planned 430ci build, you would want a big turbo, and a GT47-88 would be too small and you would have too much backpressure at the turbo.

Mr. Axe

iTrader: (1)

Thanks Pro Stock John and Hi-Flo Turbo Inc.

It was that kind of information I was looking for.
Only thing missing now is the compressor map for the GT55, anyone have it??

Thanks,
Michael

eviltwins

Screw a 430. That's a lot of bore and a lot of stroke for boost, and doesn't give you really any room to rebuild if you screw up.

We were on the dyno this weekend with a friends 342 inch ford motor, a hydraulic roller, some mild heads, an air/air intercooler, a GT47-88 and a G-force 6-speed. Little over 1300 RWHP on VP Import. On 93 octane pump gas it made 840 RWHP and 790 RWTQ. You really don't need a GT60 and 430 inches for a street car. This thing on high boost blacktracks mickey thompson drag radials to literally ANY speed. Running too huge of a motor and a turbo like that is going to hit like a **** ton of bricks and just spin. Trust me, I've driven cars with 100+MM large frame turbos on the street and they get old VERY quick. Running at 840 to the wheels off the wastegate yeah it still spins pretty hard on the street if you mash the gas but atleast it's controlable and fun.

Pro Stock John

iTrader: (34)

840rwhp on pump is impressive, is that with meth and what compression is the engine? 1.08 AR?

smokinHawk

iTrader: (48)

basically your just waiting for someone to tell you its ok.

the real question is how much power are you trying for? unless your shooting for over 2000HP the GT60 is worthless
next is cubes why 430 later, just some magical number you picked out.
i would first pick a power level your trying to acheive which would estimate a turbo for you, then choose an engine size based upon the turbo and your drivability requirements, then trinkle down to the other parts.

Pro Stock John

iTrader: (34)

Sounds like you want to build the engine for the turbo.

Better off spec'ing a combo based on your goals.

Heck a GT47.88 can potentially make 1400hp, imagine what a GT60 can make. One would think a GT60 car would run deep into the 7's.

Mr. Axe

iTrader: (1)

NO, I was not waiting for someone to say it's ok, but somone that could give me some info other than "thats to big" or "why not go with a 408"

If you read the entire tread you would see why the I'd pick the 430 and why I was looking for information on the GT60.

One last thing - Have any of you actually looked on a compressor map and done the math on a 430 engine with a GT60??

Thanks,
Michael

Pro Stock John

iTrader: (34)

GT60 sounds like it could make 1700hp or something. Not many folks in here have the $ to setup a system like that.

sb427f-car

Or 6s depending upon the application (IE my avatar, though not exactly sure what turbo is in that car, but it's BIG!!! @ least a 108mm)