Cat_rebel
New member
So $850ish for a non gated S475. What size is the compressor wheel? (ind/exd)
Garret vs. Borg Warner
- Thread starter Big Bore
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Big Bore
Active member
I thought adding an atmo charger gave you better response on the bottom and more top end??
MadDiesel73
New member
ive read the exact opposite of this marty.. everyone says it spools even faster. or is it different at 10k feet? im at sea level or close to it. or is that why guys say to go with a big 88-91mm to not create a restriction?
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Hotrodtractor
Moderator
Setup setup setup. A 38R turbine is so small already that it isn't hard to spool - but the addition of the atmosphere will slow down the spool up of the 38R - especially if the atmosphere has a restrictive turbine wheel on it that will decrease the pressure drop across the 38R's turbine. The balance factor is what is going on with the atmosphere - while the 38R is slower - what is the atmosphere doing? Is it spooling? Is it just making a restriction making things worse?
In my personal opinion - the turbine setup on these things make or breaks the setup. some very responsive setups have much larger turbine wheels than what most people can imagine. Going with some very personal experience from my past - an S475/83 is not a "race" charger IMHO its a "big" street charger- the turbine side is incredibly too small for competition use - I would rather use the 88mm at least or the 96mm turbine wheel for a race setup. I know of staged turbo setups using 96mm turbine wheels on the high pressure charger with really good spool up characteristics. Nothing I would recommend for high elevation mind you.
You have posed a good question about compounds at elevation - that I suppose I need to think about some. You know that I prefer a much larger atmosphere than what you have, and I understand your concerns about spoolup.... I need to chew on this a bit.
In my personal opinion - the turbine setup on these things make or breaks the setup. some very responsive setups have much larger turbine wheels than what most people can imagine. Going with some very personal experience from my past - an S475/83 is not a "race" charger IMHO its a "big" street charger- the turbine side is incredibly too small for competition use - I would rather use the 88mm at least or the 96mm turbine wheel for a race setup. I know of staged turbo setups using 96mm turbine wheels on the high pressure charger with really good spool up characteristics. Nothing I would recommend for high elevation mind you.
You have posed a good question about compounds at elevation - that I suppose I need to think about some. You know that I prefer a much larger atmosphere than what you have, and I understand your concerns about spoolup.... I need to chew on this a bit.
MadDiesel73
New member
Not to hijack But How would a 38r 1.0 or 1.15 with a s483 96mm turbine 1.32 housing spool at sea level vs altitude? Would a smaller housing help ?
Marty
New member
The altitude is the only reason I would even consider a small first stage like Frank is thinking about. I'd still run the largest exhaust wheel with a medium to tight housing on the S475 first stage though.
At sea level an S475 as a first stage would be ok for maybe 250/200's or so, but I'd go S5 or GT47 or GT55 with any 300+ cc injector. Then again I'd run an S465 as a second stage and run the 83 wheel with a .9 housing.
Oh well, that's my opinion. I haven't done it. Take it for what it's worth.
At sea level an S475 as a first stage would be ok for maybe 250/200's or so, but I'd go S5 or GT47 or GT55 with any 300+ cc injector. Then again I'd run an S465 as a second stage and run the 83 wheel with a .9 housing.
Oh well, that's my opinion. I haven't done it. Take it for what it's worth.
Marty
New member
Measures 74.4 by 100.8 IIRC.
Big Bore
Active member
Marty
New member
Not one in my eyes for a first stage.
Big Bore
Active member
jkidd_39
Member
http://www.turbokits.com/Turbo_Chargers/Bullseye_Power/S400_Series/
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Big Bore
Active member
I goggled that and came up empty.
Big Bore
Active member
Ok thanks. They have an S400SX-75 with ETT wheel 96mm exh 1.32 A/R housing T6 for $649. This has my attention.
Powerstroked162
On Da Juice
Agreed
PowerstrokeJunkie
Active member
That is the turbo that comes stock on alot of OTR truck engines if I recall correctly the series 60 detroits?
jkidd_39
Member
Why a 96mm exhaust wheel?
I would think an 83mm, 87mm, or 91mm exhaust wheel. Would get moving easier.
Remember.. You can always go larger on your wheels but you cannot go smaller.
If you outgrow the 87 you can always go to a 91 or the 96
I have an S480/96/1.32 on the shelf and in the beginning I wanted to go to an 87mm ext wheel. But I couldn't go smaller. Now I'm considering bumping up to an 88mm comp wheel.
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jkidd_39
Member
I thought the 60 series came with a Garrett 4202.
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Your missing a important post awhile back about having the low pressure with a too small turbine will hurt the spool of the high pressure.
To me from what I have experienced a large turbine in the atmosphere is kinda important the high pressure turbo is your altitude compensator anyway
To me from what I have experienced a large turbine in the atmosphere is kinda important the high pressure turbo is your altitude compensator anyway
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