nastychevelle

iTrader: (7)

im looking at a 72mm or 75mm S400 both with the T6 flange and 1.10 A/R Ratio i was wondering if this would be a good turbo for a 5.3

the 5.3 is going trough a built TH350 with 3600 stall and a 10bolt with 4.11's and posi (might switch accordingly)

i figured the 4.11's will make up for the big A/R and help me get into the boost quicker (also might be getting a 50-75 shot of nitrous off the line to help with spooling also)

full rundown of the 5.3

218/224 .550/.550 114
TSP pushrods
LS6 springs (will be upgrading to a spring with a higher seat pressure around 150#)
ls1 intake will be swtiching when money allows
60# injectors
ARP rod bolts


something tells me im gonna have to modify something to get a 5" DP to work with the stock k member though haha. im thinking about cutting a 6" pipe in half and knotching the k member with that and running the DP tucked in the 6" pipe

DrTurbo

iTrader: (3)

How much power you want???

nastychevelle

iTrader: (7)

as much as i can with a stock bottom ended 5.3.

if i use a bigger turbo wouldnt i need less boost to create the same amount of power?
4.11's would help me spool quicker wouldnt it?

DrTurbo

iTrader: (3)

Yes less boost , but a little more lag...though won't be much. As for gearing, you want the other way around. More load gets you quicker spool up.

nastychevelle

iTrader: (7)

so what should i go with as far as gears? 3.42's? or 3.23's?

so a 72mm s400 would work? or should i go 75mm? can you get those turbo's in a .80 instead of 1.10?

DrTurbo

iTrader: (3)

I would go 75mm, and stick with the 1.10A/R. A smaller A/R will have backpressure problems as the power goes up. As for gears...3.42's.

nastychevelle

iTrader: (7)

those still have the 5" down pipe right? would i have alot of problems if i necked the exhaust down to 4" right after the turbo?

DrTurbo

iTrader: (3)

Yes 5" and no problem necking it down.

nastychevelle

iTrader: (7)

alright thanks alot

what would my power look like with the setup listed above at say 10-12psi?

hellbents10

iTrader: (10)

I agree for the most part. The 1.1 83mm TW will come on pretty fast with a good tune. The 72 has carried us to 747rwhp on a 6sp car. We have went too 825 with a 74. At these power levels we were beyond 2:1 for pressure ratio with the 83mm turbine wheel. Although we wouldn't push the stock engine much further anyhow.

We used the 1.1 t6 combo with a 68mm compressor wheel and it came in stupid fast and made 681 to the tires through a 4l80e, 4:56's and 35" tires. You can do a search for that one rather recent.

ZL1Killa

iTrader: (17)

i'm getting ready to go 67mm or 70mm on my 346 5.7L

nastychevelle

iTrader: (7)

im planning on going with the 75mm and maybe a 50 shot off the line...

nastychevelle

iTrader: (7)

so how much power you think i could put down with this setup..


5.3
ls1 intake (will get switched when money allows)
mls head gaskets
218/224 .550/.550 114lsa cam
tsp pushrods
high seat pressure springs 150+
arp rod bolts
60# injectors base pressure at 60-65psi
aeromotive boost referenced FPR
truck manifolds
2.5" crossover
75mm s400 (hp at different boosts... 10/12/14)
4" thick frontmount IC
tial 38mm WG
turbo xs rfl BOV
4" DP into a bullet>cutout>magnaflow dumped at axle (sleeper status =) )

TH350 rebuilt with good bands/clutches/shiftkit/ 3500-3800 stall

10bolt
3.42's
stock posi (gear style not clutch style) (also will get changed when money allows .. or it breaks)


also what kinda times do you think i could put down with these suspension and chassis upgrades

8pt cage will get switched to 10pt if i break 9's
SFC's
custom made adjustable LCA's
adjustable torque arm
315/50/r15 et streets or nitto 555r's
also might use a 50shot off the line if i run lower boost (10-12)

hellbents10

iTrader: (10)

What year is the engine, the rods are the determining factor in high hp stock bottom builds, is a 05' newer??? If it has the old rods I would keep it below 650whp through a unlocked stall. Should go 130+mph at under 3500lbs then. If its a 05' newer engine with floating pins then 750whp can be had with good fuel and a careful tune. At least this is what we have seen before you bend and then snap rods. These numbers are through a stall, we have been over 850whp through 6sp's on the 05' newer stuff.

b00sted

iTrader: (7)

Stop putting together dream lists and start building something.

nastychevelle

iTrader: (7)

first off its not a dream list.... its whats going to happen... its gonna take a while but it will happen so GTFO

the motor is a 02 so looks like ill have to keep it below 650 for a while.... im gonna have to do some weight reduction to get it under 3500lbs with me in it cause im 250lbs myself... but i guess ill have to weigh it before to get an idea....

so are you saying the stock pistons arent a weak link that its the rods? like if i upgraded the rods and kept the pistons stock would it be decently strong?

hellbents10

iTrader: (10)

Yes the rods have bent before the pistons break in my experience, that is with good fuel and careful tuning. All of the ones I have seen with broken pistons have been from detonation. I think the pistons in the 05's are stronger too.

Either will break on pump gas though especially above 500whp.

nastychevelle

iTrader: (7)

alright well im going to keep it on 93... maybe even e85 if i can find the extra cash to spend on injectors (i'd be using 80's at 60-65psi base pressure) that would help out and keep me far from detonation if im low boost right?