aaronware76

iTrader: (2)

Hey guys, I've got a 99' ls1 ta with torquer v3 cam, Prc 5.3 heads milled .020, a ported fast 92mm setup, ls7 clutch, 9" w/ 3.89's. Car makes 460/424 on a rich tune now. Thinking about scrapping my nitrous plans and going single turbo. Without changing anything, can I slap the turbo on and make good reliable power even though I'm relatively high compression? I'm about 11.1 roughly. I'd be totally new to boost and feel like I'll get greedy with the spray and blow my stock bottom end apart so I'm thinking this may be a better way to go. Thoughts?

99T/AMAN

iTrader: (1)

I am finishing pulling the nitrous off my car tomorrow because I have a Huron Speed kit waiting to go on. Nitrous was ok but I want all the time power and not have to worry about filling the bottle all the time. Go boost

aaronware76

iTrader: (2)

I know I'll want the power all the time as well. I'm just curious how well the boost will work with my top end setup. I don't wanna go through the hassle of doing heads and cam again What is your top end set up?

99T/AMAN

iTrader: (1)

Still the same as my signature. I have a set of 317 heads to change to if I want but going to start with what I have and upgrade from there

StangTamer

iTrader: (6)

I had a similar setup also, stock bottom end ls1 high compression, 9" Moser. On 91 and 50/50 meth the car made over 650 on that same turbo and 12 lbs of boost

aaronware76

iTrader: (2)

Wow... Did the bottom end stay together? I would think at 12lbs plus already having heads and cam, that bottom end would be a ticking time bomb. I need my shortblock to stay together because when that time finally comes, it's gonna be a big cubic inch build, all forged. Lots of dough. I know I'm pushing the limits but I wanna get as close to that edge as I can without going over.

aaronware76

iTrader: (2)

My bad, it's actually a 78/75 on3 turbo. Also, is that size good for stock cubes?

StangTamer

iTrader: (6)

Bottom end held great, had ARP rod bolts is all. I think the 7875 will do awesome, I was going to pick one up for my Xtreme to see how it does but i just got a screaming deal on another 76. You'll like your setup, they're a different animal with some boost

lmt0705

iTrader: (7)

Boost and nos!

aaronware76

iTrader: (2)

I figure 28lbs of boost with a 100 shot to spool the turbo up faster is the way to go. The bottom end will handle anything I throw at it! Good ole lmt0705 what do you think?

lmt0705

iTrader: (7)

2 100mm turbos and 2 stages! one 7 second pass and ill pick up the pistons when your done!

denmah

iTrader: (2)

my truck made 700 tire unlocked 80e on pumpgas with a 6.0 and 7875

aaronware76

iTrader: (2)

Better make that a 4 second eighth mile pass. It'll be scattered all over the track before the end of the quarter.

aaronware76

iTrader: (2)

So, the consensus here seems to be that even with a high compression setup, I should not be afraid to throw some boost at it? Id be happy with low boost and high 500's for power but it looks like similar setups are going way over that and staying together. I always thought the stock bottom ends are good till about 525-550 rwhp.. Is there something about a turbo and the way the boost is introduced vs other methods of making more power that is letting the stock shortblock survive? Anyone else have a success or failure story with this turbo on a H/C/I setup?

FourG63 97GST

iTrader: (1)

I did the same, LS6 10.5:1 compression nitrous car, I did change out the cam though.
what are you running for fuel? I'm on E85, so wasn't concerned about compression.
we have the technology. just pull some timing, and let the turbo do the work

aaronware76

iTrader: (2)

I'm just gonna use the same 93 octane gas I always have. I don't know if I'd need a methanol setup to go with it or what the best option would be. There is e85 available around here also, just never thought about using it.

lmt0705

iTrader: (7)

Your limited by the stock short block so your not looking for Max power and a bunch of timing so e85 is not necessary and it's a big upgrade price tag. You need a lot more pump, injectors and fuel lines that are compatible with e85

aaronware76

iTrader: (2)

Yeah ideally I'd like to just run 93 octane with really safe tune to preserve the bottom end. Also, not looking to go crazy from a budget perspective so I figure 5-8 lbs of boost maybe, safe afr and conservative timing. Whatever it makes, it makes. Anyway you look at it, it's gonna be a huge increase from what I currently have. Plus, I wanna be able to daily drive the car and still put the wife and kids into it and not worry about anything going wrong.

aaronware76

iTrader: (2)

Thank you for all the replies guys and your experiences. Some people have said that the 78/75 is too big for a 347 and could have a lot of lag? And possible issues with back pressure? I understand the lag part of it but not the back pressure or possible boost creep end of things. There is a On3 76/65 turbo, a little smaller. Would that be better? I'm still leaning towards the 78/75 but would like to hear some thoughts about these other issues. Thanks in advance.

IronBlocked

Backpressure/boostcreep will be achieved when you cant dump the exhaust gasses through the wg/turbine overspeeding the turbine, a smaller turbine 7665 will only make things worse, Matt's truck made 700 wit a 366 inch motor, your engine is smaller which makes things better for you, backpressure wise