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On3 performance 78/76

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Old 06-26-2014, 07:12 AM
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I wonder how this turbo would compare against the standard S475 on a 5.3l. I ditched the on3 76 because of the ridicule amount of backpressure. on 15psi after 6200rpm my powerband would fall badddddd.

of course this would come out after I already made the new pipes for the s475. Ohh well.
Old 06-26-2014, 07:29 AM
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i have a built 370 truck, with a on3 76/64 on it, ( it was a stock 4.8 truck)

and my friend just bought this 78/75, so i am going to directly swap it and see the hp difference

it has SERIOUS trouble getting over 500whp and is capped off at near 550, so it will be interesting to see how much more i can get out of the 78/75
Old 06-26-2014, 08:40 AM
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That will be a killer comparison. What trans/stall and was it locked up before?
Old 06-26-2014, 08:47 AM
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its a 4l80e with a stock converter right now, unlocked
Old 06-26-2014, 10:16 AM
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I'm curious as well. The price of the 78/76 is so good, I'm thinking about just buying one up because I will eventually move over to turbo. Let us know how that all goes denmah.
Old 06-27-2014, 04:21 AM
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Originally Posted by denmah
i have a built 370 truck, with a on3 76/64 on it, ( it was a stock 4.8 truck)

and my friend just bought this 78/75, so i am going to directly swap it and see the hp difference

it has SERIOUS trouble getting over 500whp and is capped off at near 550, so it will be interesting to see how much more i can get out of the 78/75
Nice! This should be interesting.

With that forged 370 we should really see how much this new on3 78mm will put out.

I thought for some reason you posted somewhere that you guys were gonna order a billet s476 for the truck. I like this plan better ha.
Old 06-27-2014, 08:48 AM
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Originally Posted by denmah
i have a built 370 truck, with a on3 76/64 on it, ( it was a stock 4.8 truck)

and my friend just bought this 78/75, so i am going to directly swap it and see the hp difference

it has SERIOUS trouble getting over 500whp and is capped off at near 550, so it will be interesting to see how much more i can get out of the 78/75
Eagerly awaiting results!
Old 06-27-2014, 09:44 AM
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I have one on the way to replace a GT45.
Old 06-27-2014, 10:28 AM
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Originally Posted by 95bowtie
Nice! This should be interesting.

With that forged 370 we should really see how much this new on3 78mm will put out.

I thought for some reason you posted somewhere that you guys were gonna order a billet s476 for the truck. I like this plan better ha.
the s476r with the 92 turbine is on the way for the truck also
Old 06-27-2014, 05:14 PM
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Ordered on to replace my tc78, in for some results if anyone beats me to it.
Old 06-28-2014, 02:50 AM
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Originally Posted by denmah
the s476r with the 92 turbine is on the way for the truck also
Oh lawd!
Old 06-28-2014, 07:02 AM
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My two showed up yesterday. Can't wait to see what someone makes with one on a max effort setup
Old 06-28-2014, 07:14 AM
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Originally Posted by I8URLS1
My two showed up yesterday. Can't wait to see what someone makes with one on a max effort setup
You doing a twin setup? or you just have two for different cars?
Old 06-28-2014, 08:08 AM
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Originally Posted by BLINGOLE
You doing a twin setup? or you just have two for different cars?
Twin setup
Old 06-28-2014, 11:07 AM
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Originally Posted by viper6549
I have one on the way to replace a GT45.
ill wait for your results
Old 06-29-2014, 02:00 PM
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Just purchased one today. Lets see how much better it breathes overt the 76 on the 6.0
Old 06-29-2014, 02:02 PM
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I hope to see some good results from this turbo! Hoping people put up videos. This will probably replace my choice of the s475 pending those results.
Old 06-29-2014, 02:13 PM
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Definately in the same boat. I ordered the Denmah 45 back in the fall and won't be starting my build till this fall. If the results look good for this turbo, I'll definately be picking one up
Old 06-29-2014, 08:30 PM
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Hopefully someone gets a car on the dyno soon with one. If it can make 750-800whp I would be pleased. I honestly think it will be more capable than that (in a manual application)
Old 06-29-2014, 08:52 PM
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Originally Posted by I8URLS1
Hopefully someone gets a car on the dyno soon with one. If it can make 750-800whp I would be pleased. I honestly think it will be more capable than that (in a manual application)
Quite a few on here have bought one with the purpose of replacing a smaller turbo. I bet we will see numbers in a week or two.


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