6togo

iTrader: (13)

Getting ready to buy a pair of turbo's for my lsx 427 build shooting for
1Kwhp maybe a bit more down the road I had planned on picking up a pair of Comp 6767BB .81 housing i seen a few guys run 67's on a 427 with good results plus they are a fairly small package to place are these a good choice or should i go a bit bigger?

v502

iTrader: (1)

6767 will get you to a 1000 rwhp but not really ideal for that engine size.

Turbine side is bit small (too much back pressure) and you have to run turbo real hard on anything over 1000whp.

Street & strip / between 6775 or 7175.

6togo

iTrader: (13)

I would like to it the 1k at 15-18psi Comp has a 7075 with .81 or .96 exhaust housing just a little bigger frame i think they have a .96 housing for the 6767 also. I just dont want to make it very laggy going to big on the turbo's.

Toxic-Evo

iTrader: (2)

id run PTE 6266 with a t4..... they have a .58 and a .68 AR option.... the nice this is you plan around a t4 and once that 1000 gets borring. you just up the AR and the turbos will support more...

5spd-iroc

not to hijack this but would about single turbo? s480?

6togo

iTrader: (13)

I would need a very large single to work right with the 427 which takes lots of room plus I like the symmetrical look of the twins!

ws602

iTrader: (2)

Precision 7675

6togo

iTrader: (13)

I think two 7675's for my goals are a bit much.

bigboy2

iTrader: (3)

I have twin s480 billet wheels on my 427...

ws602

iTrader: (2)

Just turn the boost down :-)

6togo

iTrader: (13)

I hear ya! Those S480's should be nasty huh!

Blackpanther99

iTrader: (8)

Not really. What fuel are you gonna use? What trans?

qqwqeqwrqwqtq

6266's on a 427 would have great response and easily reach your goal of 1000rwhp and could do 1150+ if pushed.

Twin 7675's are good for close to 2000rwhp so I would say they are overkill. No sense in sacrificing a ton of response and midrange power if you aren't going for at least 1600-1700whp with these.

Orr89rocz

iTrader: (13)

Fwiw i have a 400" sbc making 1009 sae thru a 4500-ish stall th400, on master power T70's. T4 .96's. p trim 64/74 turbine wheel, starts making some psi in the mid higher 3000's, really starts coming in lower 4000's. definately full boost above 4500-5000. Shift 7-7.2 if needed. Its smooth spool, not tire shredding instant but not some huge lag. I like it. But also havent played with spool tune up lol its still low on timing

I would think a new tech 64-67mm could work but with the cubes you'll likely fit maps better with a 67-71 ish size.

dmaxvaz

iTrader: (1)

i would do twin s366s with 7 blade billet wheels from Forced Inductions on that 427

6togo

iTrader: (13)

Nope dont paln on pushing the power that far maybe 1300 way down the road but that would be it for this build. I will be running a 4L80E trans and 93 pump thats is why i plan to keep the boost down.

transam69230

iTrader: (49)

I will be running a pair of TC 76/68s witha .96ar on my 427 LS next gen motor. I would not be afraid of a 75/76 at all!

I do know of a twin turbo 427 GTO that has PT62/66s and made a 999rwhp on 22lbs of boost. They are currently in the process of upgrading to PT 75/76s if that tells you anything.

To me its all about what you can or cannot afford. I am running 76/68s cause I got a good deal on them and should be about right for a 427. If I need to upgrade in the future I will but I want to see what these are capable of first.

venom ws7

iTrader: (13)

PTE6766's 1.08A/R will easily make 1000rwhp and 1400+rwhp later on when u you go crazy is your car manual or auto?
I have them in one of the cars I build made 1085rwhp 16-17psi on 91octane 454ci LSX C6ZO6.

stevieturbo

They would make a good reliable budget option. Plus they have a lager turbine than the normal Precision 67's etc

BullF-16

this is my plan on my LSX 427 built by HKE. Currently running my D1SC from my LS3 which i popped. Planning on .96 A/R with T4 housings. Initial plan is about 20psi and between 1000-1100rwhp on my 5th gen Camaro. Hope this combo works out ok!