I know I'm a little late with this, but the best fitting drain flange for this turbo is the Vibrant 2898. I assembled my hose off the car and then just bolted the flange on. I have all the clearance in the world.

 

Looking to purchase journal version for my 4.8 silverado as a rear mount. Think the 76 with a .81 would be to big. Looking for quick spooling and more usable street torque then anything else.

 

yeah, i was thinking of doing that actually. using a female flange instead of a male flange. the male part just comes out too far.... thats what she said lol
at least its a cheap thing to get so its ont like im throwing hundreds of dollars at it. and i can savef it for later

 

Whats your hp goals? A 4.8 with a turbo cam won't have trouble spooling the 76mm even if its rear mounted. I say the .81 housing is perfect for rear mount it spooled the 76mm in my s10 fast. The t70 will probably leave you wanting more, unless you are sticking with the stock cam, I'm that case go with the 70mm

 

for future reference for anyone, ive stated before that an angled oil drain flange is almost a must if you plan on using a 10an fitting. if your just using a push on then not so much. the angled flange gives you room to thread on the fitting and so you dont have to grind the bolts that hold the compressor housing. also it you clock it right, its out of the way so you can get to the bolt. Mind you if you leave a bolt out, make sure its NOT the one on the compressor outlet. the bolt goes through to the inside. youll be losing boost if you dont keep a bolt in there. id recoomend some kind of sealant on that one. i noticed this while i was trying to pre clock my turbo for my rear turbo loccation. fortunatly i didnt find out while trying to figure out a boost leak lol
It clocks nicly too. all the bolts are reasonably accesable and tighen down. Funny thing too is oyu can use your old valley pan bolts to bolt down the feed and drain flanges lol ill probably change those to stainless bolts later but for now, these work great and bold down further in the bolt hold for a more secure bolting. the bolts supplied by the flanges are too short. only give about a half inch of bite while the valey pan bolts are a good 1ich maybe more and have a flared head nice!

 

I just sort of skimmed through most of the pages. But anyone running the on3 88? Considering it for a 370 "budget" build for my 67 nova swap.

 

This is back from the dead, since it is i got a question. What on3 turbos would you guys pick for a 347 (twins) t56, street/weekend warrior, goal of 850whp??

 

twin 60s would be ok. twin 70s even better if you can fit em.

 

I followed this thread back when it was active. I just re-read it all.

Now that it's been a few years I'd like to know how long these turbos have lasted for those that have at least a few thousand miles on them.


It's hard to find good info about these. Threads about them are full of people bashing Chinese turbos, people saying the bought one but haven't installed it, or people that have dyno-ed but have no mileage on them yet.

This thread was about the 7665 but I'm interested in experiences with the 7875 too.

If you had one fail, please share how long it lasted and what you think caused it to fail.


If you have one still going, how many miles have you put on it?

 

I started a thread on the on3 78 back last year. Mine has around 5000 miles pushing 17psi in my turbo truck. Im very happy for the 420$ i spent.

 

thanks man, you might have just saved my butt on restrictor. Was trying to get my oil pressure up.