Stock turbos for cheap parallel setup?
Stock turbos for cheap parallel setup?
My 606 engine didn't come with the turbo so I never ran the stock one admittedly. The K14 can make a solid 250-300 hp can't it? I'd like to guestimate 30-35lb/min out of that turbo... so something in the 65-75ish lb/min range (like an S300) wouldn't be out of line but maybe I'm way off with the K14 size. My main concern is I've noticed most of the people I've seen do Benz compound setup go too closely sized with the turbo's and have poor results. This isn't a set of "towing compounds" for a Cummins that only operates between 1200-3000RPM, we have a huge RPM operating range (ie. 5,500 RPM redline and we still want boost at 2,000 RPM) so we end up needing map width more than gigantic pressure ratio. You need the manifold charger to light instantly and just not run off it's compressor map before the big one lights... we don't need 150psi of boost like the Cummins, just 45-60 or so but over a giant operating range. Also, from what I've been told by countless pulling competitors, you only get about 75% of the big turbo's actual flow capability in a compound setup so you have to size bigger; so in a compound setup you can expect 800+ out of a S475 vs 1000+ in a big single setup.
TwoMuchBoost
07-06-2020, 11:19 AM #5The reason the S475 is chosen is because it supports a ton of power and is the cheapest bang for your buck. They came stock on Detroit diesels so you can grab them for under $600 and it flows 1000+hp worth of airflow. You can get an S472 or S467 as well but not as cheaply. My S251 flows right around 50 lbs/min and the HX35 has a 54 or 56mm compressor. S475 flows around 105-110 if I remember correctly so they're actually right around that 2:1 ratio. The trick is sizing the exhaust housings, wheels, and gating correctly to not have drive pressure out of whack.
My 606 engine didn't come with the turbo so I never ran the stock one admittedly. The K14 can make a solid 250-300 hp can't it? I'd like to guestimate 30-35lb/min out of that turbo... so something in the 65-75ish lb/min range (like an S300) wouldn't be out of line but maybe I'm way off with the K14 size. My main concern is I've noticed most of the people I've seen do Benz compound setup go too closely sized with the turbo's and have poor results. This isn't a set of "towing compounds" for a Cummins that only operates between 1200-3000RPM, we have a huge RPM operating range (ie. 5,500 RPM redline and we still want boost at 2,000 RPM) so we end up needing map width more than gigantic pressure ratio. You need the manifold charger to light instantly and just not run off it's compressor map before the big one lights... we don't need 150psi of boost like the Cummins, just 45-60 or so but over a giant operating range. Also, from what I've been told by countless pulling competitors, you only get about 75% of the big turbo's actual flow capability in a compound setup so you have to size bigger; so in a compound setup you can expect 800+ out of a S475 vs 1000+ in a big single setup.
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