I'll post pics when I can I'm a trucker so buying everything I have a 6.0 block with a wiseco 3.90 inch stroke and custom pistons 9 to 1. Also the block has a main girdle and all arm stud kit. Im running ls3 procomp heads that are cnc'd and running manley valves. A custom grindle cam and a Holley hi ram 102 intake with a 102mm eBay throttle body. The cam is set up to run from 2600-7400 rpms 116 lobe sep and 651 lift which I plan on turning. I'm using obx up and for headers 1.8 yella terra roller rockers. The power goal is 1000 plus rear wheel horsepower. I'm looking at a set of on3 70 mm turbos Turbo Specs
dum
Cold Side:
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dumCompressor Wheel 70mm
.70 a/r
4” Inlet and 2.5” Compressor Outlet
Inducer-dumdum 70.15mm
Exducer-dumdum 94mm
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Exhaust Side:
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Exhaust Housing T-4 Flanged Divided
Available in 2 A/R sizes -dum .68 or 1.0
3.0" Vband outlet
Inducer-dumdumdum64.5mm
Exducer-dum
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360 degree Thrust Bearing
I think these would be comparable to a s400-80 for a single any thought or input would be nice I maxed out my cash flow or I'd run the Borg or twin 67 percisions

 

Any input would be nice I know they're Chinese turbos but any turbo can crap out without proper oiling and the rustang owners love them

 

stay away from on3,just do a search for on3 on the turbo forums,
iys not that the stuff maybe bad but the guy is a douche and will not honor warrenty
and on that engine i would try not to use chinnesse turbos if u can help it ,that being saud i love chinnesse turbos lol

 

There's goods and bads on any turbos my buddy has a 76mm on3 on he's mustang for the last 2 years and has put 36k on it at 9 psi with no problems at all

 

u dont have to tell me i have over 60k mmiles on an ebay turbo ,and another combined 30-40 on other ebay turbos

 

Turbos would work i know some guys have used on3 stuff with success. For a good expensive block build, i would rather see some better quality turbos but i have master powers which arent the best out there either...but abit better than ebays imo

Run the 1.0 housing. Probably wont be in good boost til around 4200-4500. My 400 with 330 cfm heads and .640 cam spins t70's by 3600. Sees some boost but not fully energized til 4500

 

What kinda horsepower are you putting out ?

 

Would have guessed in the 700's whp on 13 psi but had a bunch of problems. Valvetrain stability which didnt allow me to see full power. It will be up around 1000 next year after refresh hopefully

 

What's mostly giving you issues cam or valves rockers etc

 

with the good built engine I wouldnt chance the ebay turbos. Yes they are hit or miss. You you really wanta take the chance of one letthing go?

Wht not just save a few more bucks and go with two tc76's

 

That's what I've been towards a gent on the ls1 site can sell me a pair for 1350 almost triple of the on3 but ill get a warranty for a year on the tc72s

 

My car, not sure what the issue was. Thinking my pushrod/rocker geometry was off which killed the intake guides and springs...they didnt measure out right on pressure, about 30-40 lbs low using a basic pull lever type gauge. Once motor and heads are freshened up and ready to install on stand, I'll go over geometry again. I think I used too short of a pushrod.... Hard to say.