Compound turbo build and other updates

12vCumminsFTW

12vCumminsFTW

Active member
Ok, so I've been kicking around the idea of building a twin setup using the 66 I already have. I'm getting a spool flange for it, which I hope will make it spool pretty fast. Got a steed speed straight flange manifold, it puts the turbo pretty high up, I think if I move the heat exchanger there would be plenty of room for a primary under it.

Anyway, I'm wondering what would be a good primary to run? If I do this its gonna be kinda on a budget. I also want the overall boost to be as low as possible, as I don't have o-rings. I was thinking maybe a s475, 78, or 80 with the 96 turbine and 1.32 t6 housing. Not sure if I would need a gate or not?

Any input would be appreciated.
 
12vCumminsFTW said:
Ok, so I've been kicking around the idea of building a twin setup using the 66 I already have. I'm getting a spool flange for it, which I hope will make it spool pretty fast. Got a steed speed straight flange manifold, it puts the turbo pretty high up, I think if I move the heat exchanger there would be plenty of room for a primary under it.

Anyway, I'm wondering what would be a good primary to run? If I do this its gonna be kinda on a budget. I also want the overall boost to be as low as possible, as I don't have o-rings. I was thinking maybe a s475, 78, or 80 with the 96 turbine and 1.32 t6 housing. Not sure if I would need a gate or not?

Any input would be appreciated.
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With the kind of air and power you're looking at I would bite the bullet and do studs and o-rings asap. Sure some have probably held that power without but I would expect they are the exception and not the rule.
 
12vCumminsFTW said:
Ok, so I've been kicking around the idea of building a twin setup using the 66 I already have. I'm getting a spool flange for it, which I hope will make it spool pretty fast. Got a steed speed straight flange manifold, it puts the turbo pretty high up, I think if I move the heat exchanger there would be plenty of room for a primary under it.

Anyway, I'm wondering what would be a good primary to run? If I do this its gonna be kinda on a budget. I also want the overall boost to be as low as possible, as I don't have o-rings. I was thinking maybe a s475, 78, or 80 with the 96 turbine and 1.32 t6 housing. Not sure if I would need a gate or not?

Any input would be appreciated.
Click to expand...


For a 66 we use a 88 typically as the minimum. Some use 91's as well.
 
Wow, I wasn't thinking of going any bigger than a 80. I still want it be kinda streetable. I've searched around and seen quite a few 66/80 setups. I just don't want it to be too laggy. What's y'alls opinions on using the 80/96/1.32? Is there a better option that would still spool good?


Sent from my iPhone 4s
 
The 66 is what's going to make it laggy IMO. Having a smaller primary won't really make it come one any faster, not in the way you're thinking anyways.
 
like mike said, your 66 will cause the lag. That 80 will not be big enough. If your determined to run an 80, maybe trade the 66 for a 62.
 
that 66 is likely to spool faster than my current 62 does when you add the spool flange based on my experience with the spool flange and various chargers with and without the flange.
 
NickTF said:
that 66 is likely to spool faster than my current 62 does when you add the spool flange based on my experience with the spool flange and various chargers with and without the flange.
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Yes this is what I am hoping.

I don't understand why the 80 wouldn't be big enough. I'm not looking to make just tons of hp.


Sent from my iPhone 4s
 
12vCumminsFTW said:
Yes this is what I am hoping.

I don't understand why the 80 wouldn't be big enough. I'm not looking to make just tons of hp.


Sent from my iPhone 4s
Click to expand...

It will be enough, but you wont be using your large secondary to its full potential.

Sent from my DROID3 using Tapatalk 2
 
What makes an 80mm primary too small to run with a 66/74?

Pleeeeeeease don't say "the 80mm compressor wheel".

The 80 moves what?....about 110-120#min?

Since the 66 doesn't add air, just compounds it...is it because it would actually pull the primaries output down too far, and not allow the 80 to flow efficiently?

I'm curious, and don't know, that's why I'm asking.
 
Extended Power said:
What makes an 80mm primary too small to run with a 66/74?

Pleeeeeeease don't say "the 80mm compressor wheel".

The 80 moves what?....about 110-120#min?

Since the 66 doesn't add air, just compounds it...is it because it would actually pull the primaries output down too far, and not allow the 80 to flow efficiently?

I'm curious, and don't know, that's why I'm asking.
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i wonder as well cause mine drive perfect and spools fine 84solid psi
 
From what I have. Seen through Dyno numbers. The 66/80 is a peaky set up. Is there a reason you don't want to go bigger the. 80?? The 66 determines spool as the big charger size determines the type of curve
 
Not that it's too small, just that running that small a wheel leaves so much potential on the table with a secondary that big. If you're running an 80 primary, drop to a smaller secondary than a 66 and watch your spool get better.
 
Like said above if your already in with a 66 might has well run something more than an 80 to get your best out of the set up. I.was just reading somebody was running a 66 wig an 80 and liked it. So its all on what your looking for I suppose
 
97rada said:
From what I have. Seen through Dyno numbers. The 66/80 is a peaky set up. Is there a reason you don't want to go bigger the. 80?? The 66 determines spool as the big charger size determines the type of curve
Click to expand...

the closer the turbos are together the more the curve will look like a single, thats what I have seen at least.
 
So would like an 88 spool slower than the 80? Thats one of my concerns. I thought I read somewhere that a bigger primary will slow the overall spool. Price is also another thing. The new 480 is like $900, not sure what a 88+ is.

As for as going smaller than a 66, I'd like to keep it. I've got a lotta money tied up in this charger. Besides with a spool flange it should spool pretty quick.
 
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