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Old 02-05-2013, 03:18 PM   #41
Lodge125
 
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How do you think a 64/65/14 over a 84mm ht4b would do? 188/210 cam and maxed 160 pump through 7x12s..i had a 351 over a 3b and the 7x12s with a pretty much stock motor other than that and put down 500hp but i jerked the motor out now and decided to go bigger but deciding what to put over a 4b i got

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Old 02-05-2013, 05:08 PM   #42
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Originally Posted by kalder View Post
Yup. I'm in that boat. I have a 75/96/1.32 on the bottom- it ruined my truck. Was a lot stronger when my 62/68/14 was a single.
The turbo's aren't setup right then. Your turbo as a single will make about 550hp. That combo in twins is capable of 700-750hp. It will spool a little slower but if setup right it shouldn't be bad at all. Singles always seem like they make more power because they are peaky versus more linear for twins but that isn't the case most of the time.
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Old 02-05-2013, 07:00 PM   #43
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I've got a gt 4088r and a 4718 for sale. they are a duramax twin set up but I would sell the chargers separate (63mm) and (88mm)
 
Old 02-05-2013, 10:30 PM   #44
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500hp truck, small primary(GT4294, K31, 72/83/1.1 s400).
600hp truck, small turbine primary(GT4202, 75/83/1.1 S400)
700hp truck with 62 or 64/71/.8 secondary, small turbine primary(GT4202, 75/83/1.1 S400).
800 hp truck with 62 or 64/71/.8 secondary, Ok now the S400 with large turbine is something to think about.
More than 1 way to do it, but going too big on the primary(S480 on a 550hp truck) seems to be commonplace and really blows.
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Old 02-06-2013, 08:08 AM   #45
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How do you think a 4294 with a tial 1.30a/r vband turbine housing would respond on a 500hp twin set-up.
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Old 02-06-2013, 08:27 AM   #46
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How do you think a 4294 with a tial 1.30a/r vband turbine housing would respond on a 500hp twin set-up.
1.30 housing is a bit large. Which secondary with that 4294?
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Old 02-06-2013, 08:51 AM   #47
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Stock charger on a duramax. Only reason I as is because I already have the tial housing.
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Old 02-06-2013, 08:56 AM   #48
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How do you think a 4294 with a tial 1.30a/r vband turbine housing would respond on a 500hp twin set-up.
That's a slightly larger housing than the K31(around 1.28), and the K31 worked very well towing with both a 35/40 hybrid or a 62/71/.8 secondary.
It made more power, ran cooler, and made less overall boost with a 62/71/.8 secondary. A 64/71/.8 pumped the power up another 40 at the same boost level and the only down side was a bit more lag taking off. The Dodgezilla(35/40 hybrid) was the best moving away from a light, but once underway the S300's worked better. I tried an S300G in the setup and had difficulty making power without making alot of boost. 30psi of manifold pressure felt like 15psi from the larger secondaries. In all honesty the 35/40 over 3b at 500hp is a hard combo to beat too.
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Old 02-06-2013, 09:17 AM   #49
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More than 1 way to do it, but going too big on the primary(S480 on a 550hp truck) seems to be commonplace and really blows.
In my very limited experience I tend to agree with this. When I detuend my 800 HP combo of a 62/71-14 over an HT4C by taking out 200 HP worth of injector and 100+cc of DV's and lowered timing (never dynoed it this way) it drove a bit like a 62 single, but wouldn't spool the HT4C at all, just not enough fuel.
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Old 02-06-2013, 09:29 AM   #50
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Maybe I'm getting jaded but I couldn't be bothered to go less than a 96mm turbine s400 as the primary on a common rail....(unlimited low end fueling)

Even with stock injectors could spool that thing like nothing, tickled 700hp with a 64/71/13 on top, and absolutely smoke free. If I was more concerned with quicker spooling than I'd downsize the secondary before I ever touched the primary.
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Basically stock if I would have built it at the factory.....
 
Old 02-06-2013, 09:47 AM   #51
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Maybe I'm getting jaded but I couldn't be bothered to go less than a 96mm turbine s400 as the primary on a common rail....(unlimited low end fueling)

Even with stock injectors could spool that thing like nothing, tickled 700hp with a 64/71/13 on top, and absolutely smoke free. If I was more concerned with quicker spooling than I'd downsize the secondary before I ever touched the primary.
Well sure, but you're magic.
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Old 02-06-2013, 09:52 AM   #52
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I am not opposed to running a 4202 either I just figured the round inlet of the tial would work nice for the primary piping.
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Old 02-06-2013, 10:51 AM   #53
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Originally Posted by Joesixpack View Post
Maybe I'm getting jaded but I couldn't be bothered to go less than a 96mm turbine s400 as the primary on a common rail....(unlimited low end fueling)

Even with stock injectors could spool that thing like nothing, tickled 700hp with a 64/71/13 on top, and absolutely smoke free. If I was more concerned with quicker spooling than I'd downsize the secondary before I ever touched the primary.
Both ways work, but when you downsize the secondary you have to run at a higher P.R. to make the same power. I don't like seeing the gauge go too far north on a street driven truck. I like 70psi better than 90.
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