Duramax Diesels Forum Truck of the Week
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Old 03-14-2018, 08:07 AM
ouellet5 ouellet5 is offline
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Default COmpound S480 or S475

Does the difference is notifiable ? worth the 350$ more than a S475?

I'm only towing a 10 000 lbs fifth wheel and daily driver.

thanks
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Old 03-14-2018, 08:17 AM
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unless you are trying to get the most out of the twin kit, the 475 will do just fine.
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Old 03-14-2018, 08:20 AM
ouellet5 ouellet5 is offline
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Thanks that's what I think too
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Old 03-14-2018, 09:06 AM
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What James said. How much power are you trying to get out of the truck, and what is your purpose for going with twins?
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Old 03-14-2018, 09:17 AM
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I want get more power for towing. my range 600-650hp max
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Old 03-14-2018, 09:33 AM
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If y are just doing stock over 475 it would be decent, but what I have found and many others.. is that when you actually increase the size of the atmosphere turbo it actually ends up driving nicer as it is easier to "breathe through".

Think about it this way, essentially the atmosphere turbo is a restriction to the "valley" turbo so when you make it easier to pull air by increasing the size it makes drivability ALOT better, rather than making it work for it.
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1996 F-250 LLY Pullin truck....... 3.0 Smoothbore "Dirty Secret"
Huge thanks to: Wagler Competition Products, and Mark B. @Danville performance!

'15.5 Denali HD LML.
Exhaust,Tuned, Ratio Tec, twin Kennedy lift pumps.

'05 Twin turbo LLY.
LBZ Block, LBZ S&S 150% overs, LBZ heads, Callies CompStar, Wagler Street rods, Wagler Comp Stg. 2 Camshaft, Hamilton springs, Smith bro. Pushrods, ARP head/main/rockershafts, Dual CP3's, Michiana Diesel built Allison/ 1074-3D Suncoast converter, twins/DP VGT and StainlessDiesel S485/96/1.10 5Blade
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Old 03-14-2018, 10:04 AM
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Quote:
Originally Posted by diesel-max View Post
If y are just doing stock over 475 it would be decent, but what I have found and many others.. is that when you actually increase the size of the atmosphere turbo it actually ends up driving nicer as it is easier to "breathe through".

Think about it this way, essentially the atmosphere turbo is a restriction to the "valley" turbo so when you make it easier to pull air by increasing the size it makes drivability ALOT better, rather than making it work for it.
from box stock 475 to box stock 480 (which are the prices im assuming he is listing/looking at), i never saw the increase in valley turbo spool up. the cast wheels/covers they come with are not open enough to really give you a change. now you add a race cover and a billet wheel, i would agree. the 483 i am running now is just this way
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Mike L is my role model. I want to be like him when I grow up.
James

02 LL7 2500HD CC/LB dmax/alli "The Limo"

BIG THANKS TO: Mike L, Steve, Trent, Guy, Dan, Ruben, Josh H, Scott, Brian and everyone else who has put a hand in to help me.

best time to date: 12.39

motor died/bent rods = 3/11/11
back from the dead 7:04pm 4/9/2012

Limo is back in the garage, now driving a built chevy tracker
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Old 03-14-2018, 12:35 PM
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You might consider going with a smaller turbine housing than the standard 1.32 if you are doing it more for towing than all out power.
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Old 03-14-2018, 06:42 PM
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Quote:
Originally Posted by JoshH View Post
You might consider going with a smaller turbine housing than the standard 1.32 if you are doing it more for towing than all out power.


On a LML Iím using a billet wheel 475 with 87 turbine and 1.30 stainless v banded housing. Main purpose was instant spool and towing abilities. The truck on stock fuel makes 700 hp and sounds like no other. Itís a really fun truck to drive. I will try and post a sound clip of it driving off. Total boost is 59 psi. I have plenty of high hp trucks but this one is so pleasant to drive.


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Old 03-15-2018, 03:20 AM
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Quote:
Originally Posted by S Phinney View Post
On a LML Iím using a billet wheel 475 with 87 turbine and 1.30 stainless v banded housing. Main purpose was instant spool and towing abilities. The truck on stock fuel makes 700 hp and sounds like no other. Itís a really fun truck to drive. I will try and post a sound clip of it driving off. Total boost is 59 psi. I have plenty of high hp trucks but this one is so pleasant to drive.


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They also make t6 housings for the 87/80 turbine. That would be an excellent option for most people. As long as you make/purchase a kit with a t6 flange, you will have the flexibility to swap dozens of different s400 combinations out.

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Old 03-15-2018, 05:31 AM
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Quote:
Originally Posted by ikeG View Post
They also make t6 housings for the 87/80 turbine. That would be an excellent option for most people. As long as you make/purchase a kit with a t6 flange, you will have the flexibility to swap dozens of different s400 combinations out.

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I do understand they make those I was just saying what I did and how I like the setup done when one has the money to do it.


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Old 03-15-2018, 05:32 AM
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Quote:
Originally Posted by S Phinney View Post
I do understand they make those I was just saying what I did and how I like the setup done when one has the money to do it.


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Yea I knew you were aware. I quoted the wrong post.


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03 Chev CC SB ZF6-Gone
04 GMC CC SB SLT LLY
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08 GMC CC DRW-Gone
New DD/Beater: Beat up 06 GMC CCSB w/ 252,000 miles
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Old 03-15-2018, 08:47 AM
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My daily driver has a 65mm vgt in the valley and a 485/96/ T-6 1.10 as the atmosphere, I used the 1.10 as I already had it laying around. I'd use the newer 1.15 if I didn't, its more cost effective and a REALLY nice housing for the same purpose.

It made 1132hp at the tire on my chassis dyno before I quit turning it up. It drives like stock and tows absolutely awesome!
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1996 F-250 LLY Pullin truck....... 3.0 Smoothbore "Dirty Secret"
Huge thanks to: Wagler Competition Products, and Mark B. @Danville performance!

'15.5 Denali HD LML.
Exhaust,Tuned, Ratio Tec, twin Kennedy lift pumps.

'05 Twin turbo LLY.
LBZ Block, LBZ S&S 150% overs, LBZ heads, Callies CompStar, Wagler Street rods, Wagler Comp Stg. 2 Camshaft, Hamilton springs, Smith bro. Pushrods, ARP head/main/rockershafts, Dual CP3's, Michiana Diesel built Allison/ 1074-3D Suncoast converter, twins/DP VGT and StainlessDiesel S485/96/1.10 5Blade
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Old 03-15-2018, 09:23 AM
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No way is 65/85 going to be worth a chit on stock fuel.... Compared to a stocker/75, I have ran several versions on stock fuel and hands down the 75 over stock was the most versatile and fun. Now built eng is another story...
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Old 03-15-2018, 09:38 AM
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diesel-max diesel-max is offline
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Quote:
Originally Posted by Burn Down View Post
No way is 65/85 going to be worth a chit on stock fuel.... Compared to a stocker/75, I have ran several versions on stock fuel and hands down the 75 over stock was the most versatile and fun. Now built eng is another story...

I never said that setup was on stock fuel obviously at 1132hp.

BUT, truth be known.. I did run it on stock injectors dual pumps only.
and it was great. as good as stock.

Ifyou read it correctly, I'm just saying how the housing size makes a big difference on the atmosphere turbo.

but what do I know about turbos
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1996 F-250 LLY Pullin truck....... 3.0 Smoothbore "Dirty Secret"
Huge thanks to: Wagler Competition Products, and Mark B. @Danville performance!

'15.5 Denali HD LML.
Exhaust,Tuned, Ratio Tec, twin Kennedy lift pumps.

'05 Twin turbo LLY.
LBZ Block, LBZ S&S 150% overs, LBZ heads, Callies CompStar, Wagler Street rods, Wagler Comp Stg. 2 Camshaft, Hamilton springs, Smith bro. Pushrods, ARP head/main/rockershafts, Dual CP3's, Michiana Diesel built Allison/ 1074-3D Suncoast converter, twins/DP VGT and StainlessDiesel S485/96/1.10 5Blade
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