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On3 performance 78/76

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Old 10-19-2014, 12:59 PM
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https://ls1tech.com/forums/forced-in...n3-7875-a.html
Old 10-19-2014, 12:59 PM
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Did you never get any numbers from either of the 2?
Old 10-19-2014, 01:23 PM
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Originally Posted by JustAFooL
Did you never get any numbers from either of the 2?
No my cars been in body shop prison for almost a year but should be home soon. I'll be doing a twin setup with some of them and plan is to max them out once the car is all sorted out.
Old 10-22-2014, 03:09 PM
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Vs racing 78/75 came in today
Old 10-22-2014, 06:14 PM
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I am having trouble posting pics
Attached Thumbnails On3 performance 78/76-20141022_155546.jpg  
Old 10-22-2014, 06:16 PM
  #206  
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Looks like the on 3 to me
Attached Thumbnails On3 performance 78/76-20141022_155611.jpg  
Old 10-22-2014, 06:35 PM
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Originally Posted by cstrohpaul
Looks like the on 3 to me
Sadly that turbo just isnt going to work for you... Just put it back in the box and ship it to me!

Looking foward to seeing your results with this turbo~
Old 10-22-2014, 08:47 PM
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Yeah looks the same to me except the on3 has a black back I g plate for the compressor housing
Old 11-15-2014, 05:42 PM
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These 78/75s are back on eBay again. I just picked one up for a 240z 5.3 4l80e swap. Who else is going to try one out?
Old 11-16-2014, 11:32 AM
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Just ordered mine...
Old 11-17-2014, 06:10 PM
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Mine is on and running now!!!! WHO HOO!!! I replaced an mp70 with .96ar , The old turbo was out of turbine around 14psi on my truck. Seat of the pants meter says this turbo is making much more power, it wont be dynoed but I will get some track times soon. This turbine seems much quieter than the mp 70.
Old 11-17-2014, 10:20 PM
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Originally Posted by denmah
well an update here for you guys


the billet 76/96 on 14psi made 515whp, just like the 76/65 and the 78/75

so there is no power figures with the 78/75 like we wanted but i did find out that something else is wrong with this setup, going to swap the cam next with a LS2 cam since they are not great but they are not terrible, it will let me know if the cam is the problem or if i have to start going thru the driveline
You ever find out whats wrong with that truck?
Old 11-18-2014, 11:42 AM
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nope have not messed with it yet

its too depressing haha

i am going to do ecu, converter, engine

in that order

side note, my friends car that i tuned that made 540whp on 17psi with a 5.3 and 7875 went nearly 137mph on 21psi
Old 11-18-2014, 11:54 AM
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^^Denmah...what 1/4 time do you think that would put down? Using meth?
Old 11-18-2014, 12:08 PM
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Also, what was the weight of that car denmah?
Old 11-18-2014, 01:52 PM
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Originally Posted by 2muchboostNY
^^Denmah...what 1/4 time do you think that would put down? Using meth?
it went 10.20 at 137 on 21psi pumpgas and meth
Old 11-18-2014, 01:53 PM
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Originally Posted by nossty1
Also, what was the weight of that car denmah?
unsure.... 3400-3500? its a 5.3. 80e, full weight full interior fox body notch street car
Old 11-18-2014, 02:03 PM
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^^Thank you sir.
Old 11-18-2014, 02:51 PM
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I run the on3 7875 on my 99 trans am ls1. Two weekends ago I ran 10.1@135 with a 1.6 60'. This is on 15 psi and 10 degrees of timing
I've never dynoed my car though, only street tuned by me on 93 octane with meth

Last edited by tucn26; 11-18-2014 at 03:18 PM.
Old 11-18-2014, 03:04 PM
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Originally Posted by tucn26
I run the on3 7875 on my 99 trans am ls1. Two weekends ago I ran 10.1@137 with a 1.6 60'. This is on 15 psi and 10 degrees of timing
I've never dynoed my car though, only street tuned by me on 93 octane with meth

That sounds pretty good. What was your 1/8 et and mph on that pass?


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