on3 turbo
bb vs journal Sarg,
You seem to know a lot about these turbos, why would a journal or bb spool different from one another? Do they have other differences such as AR or something else?
Just trying to learn...
You seem to know a lot about these turbos, why would a journal or bb spool different from one another? Do they have other differences such as AR or something else?
Just trying to learn...
The bb ones have a little larger turbine wheel last I looked. Possible they might spool a little slower depending on the housing. I have not seen much difference in bb vs jb on spool up on any turbo. The difference seems to be more in transient responce, like in between shifts. Bb seem to come back online a bit quicker.
I ordered a journal bearing , so I will see soon what kinda of spool it makes on my setup , I also talked to the guys over there and he had mentioned that they are currently building a fbody turbo kit
TECH Enthusiast
Joined: May 2010
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The bb ones have a little larger turbine wheel last I looked. Possible they might spool a little slower depending on the housing. I have not seen much difference in bb vs jb on spool up on any turbo. The difference seems to be more in transient responce, like in between shifts. Bb seem to come back online a bit quicker.
its probably been asked throughout this thread, but if you were doing a 5.3 with on3 76mm journal bearing what size ar would you get .81,.96,1, or1.15. Single turbo with ls6 cam and thats about it for mods to the block. Not shooting for he moon and I know these turbos aren't setup the best would a .96 or 1 be preferred?
its probably been asked throughout this thread, but if you were doing a 5.3 with on3 76mm journal bearing what size ar would you get .81,.96,1, or1.15. Single turbo with ls6 cam and thats about it for mods to the block. Not shooting for he moon and I know these turbos aren't setup the best would a .96 or 1 be preferred?
Teching In
Joined: Mar 2008
Posts: 43
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From: Orange Park Florida
My shop just got a car with one of these kits. To say the least it is a neat cheap kit.. fit blows.. turbo is so close to the waterpump that the blanket scrubs it. The 3 v-bands that are on the set up were all leaking.. We managed to fix 2 of them without welding but unforunantly couldnt do so with the last . Was on a 2000 mustang. But if your any kind of fabricater it would be a good start.. Buy the hotside and peice together something better if ur on a budget... Its so possible. We turn out 5-1200 hp cars built from no budget or tight budgets every day
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Finally got mine up and going.I went with the 1.0ar and I like it a lot. Car spools pleanty fast if I want it to. And by the seat of the pants dyno should be making close to 550rwhp on #10.I do know it pulls way harder than my 150 shot did,but got a weird quirk to figure out. Any one running a restrictor on there's? I'm shooting oil past the seals above 4000rpm in boost.
also got my on3 76mm .81 ar on a 5.3 with ls7 cam running and tuned this week. made 500hp and 690 tq on 9.5 lbs on a mustang dyno through a th400. i was very impressed with the results. peak tq was at 3600 rpm and peak hp was at 4500 rpm. has very little lag which is what i wanted.
its probably been asked throughout this thread, but if you were doing a 5.3 with on3 76mm journal bearing what size ar would you get .81,.96,1, or1.15. Single turbo with ls6 cam and thats about it for mods to the block. Not shooting for he moon and I know these turbos aren't setup the best would a .96 or 1 be preferred?
Finally got mine up and going.I went with the 1.0ar and I like it a lot. Car spools pleanty fast if I want it to. And by the seat of the pants dyno should be making close to 550rwhp on #10.I do know it pulls way harder than my 150 shot did,but got a weird quirk to figure out. Any one running a restrictor on there's? I'm shooting oil past the seals above 4000rpm in boost.
TECH Resident
Joined: Nov 2011
Posts: 916
Likes: 5
From: Las Vegas, NV
its probably been asked throughout this thread, but if you were doing a 5.3 with on3 76mm journal bearing what size ar would you get .81,.96,1, or1.15. Single turbo with ls6 cam and thats about it for mods to the block. Not shooting for he moon and I know these turbos aren't setup the best would a .96 or 1 be preferred?
Current setup went 551 rwhp @10 psi. Oh, I'm running the LS9 cam.
In a rear mount setup I think either .81 or .96 would do you fine. I think the 1.15 AR would be just too big.
Also, I think the exducer is slightly bigger on the ball bearing ones vs. the journal bearing. They have the specs on their ebay purchase page. I remember that they ARE different. I decided that in the big picture, the extra $ it cost me to go ball bearing was worth it. Given, other brand BB turbos cost twice as much.
Just my thoughts.
Good luck.
Last edited by HRHohio; May 23, 2012 at 06:10 PM.
TECH Resident
Joined: Nov 2011
Posts: 916
Likes: 5
From: Las Vegas, NV
Finally got mine up and going.I went with the 1.0ar and I like it a lot. Car spools pleanty fast if I want it to. And by the seat of the pants dyno should be making close to 550rwhp on #10.I do know it pulls way harder than my 150 shot did,but got a weird quirk to figure out. Any one running a restrictor on there's? I'm shooting oil past the seals above 4000rpm in boost.
A friend went with the Journal 76mm with .81 AR (Front mount setup in his 5.3 truck) and it spools up REAL FAST! He was having oil problems too so we contacted On3. They said no restricter needed on the Journal bearing, only the BB like mine. They didn't say what size it was.
He put a breather in the oil cap and re ran the PCV lines and this helped. For what it's worth, check your PCV setup and make sure you're not overpressurizing your crankase. This can lead to too high of an oil pressure, especially at high RPM / boost...I think.
The setup I am looking at doing would be a front mount. Also they have .96 in stock and will have the 1 and 1.15 at the end of the month. It sounds like people are suggesting either the 1 or 1.15. How laggy will it be with that setup this is going to be a street car that pulls the occasional highway star run 
its a 6 speed car as well t56 out of a gto but I'm not set on rear gears yet 3:2? Or 3.4?
its a 6 speed car as well t56 out of a gto but I'm not set on rear gears yet 3:2? Or 3.4? 
Here's a quick 1st thru 3rd vid of my on3 t76. Hopefully will get my car dynoed on the 12th
https://www.youtube.com/watch?v=cr0l...e_gdata_player
https://www.youtube.com/watch?v=cr0l...e_gdata_player