okay okay, so heres the scoop

i bought a borgwarner s463 t6 64mm/75mm 1.10 a/r. thinking it would produce what i needed for my power goal of 900+. after receiving the turbo i imminently swapped out the t6 for a t4 hot side.

then i come to find out my turbo is only going to produce 66lb/min of flow. so i spoke to mike Frankie at tail sport, and he sent me some upgrade options. so i went with one of his options.

i purchased a 75mm inducer wheel and a matching compressor housing of 1.10 a/r. i just have to get the core machined for the bigger wheel.

But now i find out that a 75mm/75mm wont work with a 4 cylinder due to backpressure!

come someone guide me to what i should do to this turbo to achieve my goal of 900+ (ex. inducer wheel, compressor housing, turbine wheel, turbine housing)

this is what the turbo will be if i put on the 75mm wheel and housing

https://agpturbo.com/borg-warner-s475-t4-75-74-100-83-177101/

Though i have not used them on DSM's i have used MANY on diesel trucks over the years including many s400s. The turbine wheel your has 74.3mm exducer and 83mm OD. Sadly that's a old turbo. Something like a s467.7 witch flows 90lb/min, Or for more lag a s472sxe that flows 110lb/min would have worked better. I ran a s472sxe with 82/87mm turbine wheel and they flow some serious air and spool faster then your s475. I think Scott runs a s476 on his dsm, maybe he could help you.

jed344 said:

Though i have not used them on DSM's i have used MANY on diesel trucks over the years including many s400s. The turbine wheel your has 74.3mm exducer and 83mm OD. Sadly that's a old turbo. Something like a s467.7 witch flows 90lb/min, Or for more lag a s472sxe that flows 110lb/min would have worked better. I ran a s472sxe with 82/87mm turbine wheel and they flow some serious air and spool faster then your s475. I think Scott runs a s476 on his dsm, maybe he could help you.

Click to expand...

okay, its a s463, that im turning into a s475 t4, 74/75mm - 105lb/min

The Borg S400 series can be confusing with all of the turbine housing and wheel options...some of which do not interchange. The 83/74mm and 88/82mm turbine does not use the same bearing housing or turbine housing casting as the 96/88mm turbine. In all honesty the S300's are so versatile, weigh 15lbs less, and take up far less space there's no reason to go to the S400 chassis with a compressor that small.

We ran a Batmowheel S475 on the 88/82 turbine with a 1.10 T4 housing back-to-back against a Super 99 in the T3 .85 housing...and the Super 99 made 30 more horsepower at 6psi less boost despite the Super 99's turbine being only 76/67mm. Now that was all it had- the wastegate was pretty much clamped shut on the Super 99 at 46-47psi...and I can't confirm if the Batmowheel helped or hurt but when we tried the drop-in HX40 Batmowheel "upgrade" it didn't even perform as well as the stock cast HX40 compressor did. So perhaps a box S475 would've worked better...who knows. We also went from the single-scroll T3 manifold to a twin-scroll T4 for the S475 so who knows if there were some design issues with the manifold or another unknown factor.

From there I built the 475 into a 480 using a compressor package from Forced Inductions because the class limitation at IFO was 80mm. The 480 made some serious airflow. I think at one point during a track rental we logged 118 lb/min at 58psi. The bad news was we never really got the turbine housing dialed-in to the point of making the car drivable. Tried a 1.25 housing as that's what Jake Montgomery had used to go 7's with his S480 (although his was done with an auto trans) and the car wouldn't launch, fell completely out of boost on the 1-2 shift, and basically took half the track to get moving. Went the complete other direction to a 1.00 housing and the drivability came back 100% but then we were having unrelated problems with the catch can being undersized. Another issue with the 480 was it was too big...the turbo wanted to be above where we felt safe revving the car on the stock oil pump/case- as in the dyno chart was still trending upward at 10,600rpms. So I picked up an older Garrett-based 7675 Precision that we never got a chance to use...although in reality I'd be happy with a 7275 if it did what I want it to do which is basically work like the Super 99 did but with a little looser turbine side.

The car hasn't made a pass since the Shootout last year but we're now looking to bring it out for the FP race at Marion County in late September...of course the class limitation is 64.9mm on the compressor wheel so I'm looking to build the quickest-spooling, highest-flowing option with the most potential that I can yet again. Not sure if I want it to be single T3 or twin T4...maybe we'll be going back to a Holset, maybe I'll stay with the Borg, maybe we'll borrow somebody's 6466 since it's only for one race- who knows. All these different events with their ever-changing compressor requirements are confusing as hell and mighty stressful.

The s369sxe spools quite well and flows a ton for it’s size too. You could try to turn it into a s475 and see what it will do. But I think you will be disappointed by the spool. S400s can be dogs to spool without the correct set up.