turbo selection
09-24-2014, 12:55 AM
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turbo selection Hi guys have a lc9 aluminium block just had machine work done on block have callies rods and wiseco pistons want to do twins would bw s200 sx 56 mm t4 1.22 a/r turbos spool well? Doing a street truck 70 c10
09-24-2014, 09:01 AM
#3
I bought a pair of S300 60mm standard turbos and put them on my 6.0. They spooled almost as quickly as the single PT7675 they replaced. I then bought a pair of the s200 56 with 1.22 and put .81 housings on them. They didn't spool much faster than the S300s, about the same as the single PT7675. Maybe 200rpm difference at any point spooling up.
I'd imagine the S200 with 1.22 a/r vs the 60mm S300 with stock .82 a/r or whatever would spool the same, and the S300s will go further in the future if you want them too. I'd choose the 60mm S300, they both cost the same. I have no experience with the 66mm S300, I'd imagine they spool up a little slower since the turbine wheels are a fair amount bigger. I could be wrong though.
I'd imagine the S200 with 1.22 a/r vs the 60mm S300 with stock .82 a/r or whatever would spool the same, and the S300s will go further in the future if you want them too. I'd choose the 60mm S300, they both cost the same. I have no experience with the 66mm S300, I'd imagine they spool up a little slower since the turbine wheels are a fair amount bigger. I could be wrong though.
09-26-2014, 09:40 PM
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goal is 6-700 @ the wheels on high boost 9.3 compression 241 stock heads ls9 gaskets and cam arp head studs will probly roll around on 500hp low boost cuz its a dd which is why its forged so it wont blow up or bend rods then if someone challenges me on the weekned crank it up to 16-18 lbs thinking twins for dual exhaust and quick spool time
09-29-2014, 08:37 AM
#7
Not sure on full boost, I had very light springs in the gates. One log I just looked at had 6psi at 2900 with the s200 turbos. This was non intercooled and blow through carb with LS9 cam and super t10 trans in top gear. A few years ago with the same transmission on another 6.0 I saw 5psi at 3000 in top gear as the best spooling with the PT7675.