Attention: TDR Forum Junkies 
I have a 1997 S.T.O.R.M. 12 valve out of an 11 second truck that made 750 hp with 5 x .012 injectors and an s470/87/1.1T4 turbo waiting to be installed. The Garrett PowerMax Stage 2 GT3782 in my current 1994 12 valve was just rebuilt and will definitely not spool fast enough nor flow nearly enough air for the new engine. The new engine will need compound turbos.
There is no power goal but I've had the head ported and added a Colt Cams "Big Stick" and will run different injectors so I expect the new engine will be plenty capable of 800 hp. Drivability is the real goal. Spoolup needs to be way faster than the old Stage 2. I plan to use an exhaust manifold with a wastegate port to make a small secondary work. Much cooler EGTs is another major drivability goal. The rest of the engine build is intended to flow as much air at low RPMs as possible for cruising, though I expect it to still have plenty of power up to 5,000 RPMs.
I'm mostly looking at the GTX3582R Gen 2 and the s362SX-E. Sometimes I see it labelled as an s361SX-E having the same sized compressor wheel and housing by vendors like BD-Power. With the SX-E I would likely use the smallest exhaust sizes available. Not sure for the GTX since I know it will be a very compact turbo in comparison and I need it to flow enough to meet up with the lower power band of the primary.
Studying compressor maps has given me rough ideas that have helped me narrow down my selections so far. I'm now looking for experience based comments with these two turbos. Specifically, I'd like to know if the GTX spools significantly faster and by roughly how many RPNs. I'd also like to know if the GTX will flow close to as well as the SX-E in the mid to upper range on a 12 valve. And I'd like to know if these newer SX-E turbos are more durable than the dual ball bearing turbos.
For the primary I was originally interested in the GTX4202R but that will be beyond my budget. I'm considering an s472SX-E or an s476SX-E to be my most likely options. I will likely choose based on the secondary so that the primary is spooling well before the secondary lets EGTs get too hot.
I have also looked at the K27 for a secondary but I think it would be too large to fit in the limited space of a Ford Excursion, though to fit compounds I expect the primary will have to be high mounted above the secondary. A diverter valve sounds interesting as well but even though they've been out for years I can find very few detailed reviews. Thanks in advance!
There is no power goal but I've had the head ported and added a Colt Cams "Big Stick" and will run different injectors so I expect the new engine will be plenty capable of 800 hp. Drivability is the real goal. Spoolup needs to be way faster than the old Stage 2. I plan to use an exhaust manifold with a wastegate port to make a small secondary work. Much cooler EGTs is another major drivability goal. The rest of the engine build is intended to flow as much air at low RPMs as possible for cruising, though I expect it to still have plenty of power up to 5,000 RPMs.
I'm mostly looking at the GTX3582R Gen 2 and the s362SX-E. Sometimes I see it labelled as an s361SX-E having the same sized compressor wheel and housing by vendors like BD-Power. With the SX-E I would likely use the smallest exhaust sizes available. Not sure for the GTX since I know it will be a very compact turbo in comparison and I need it to flow enough to meet up with the lower power band of the primary.
Studying compressor maps has given me rough ideas that have helped me narrow down my selections so far. I'm now looking for experience based comments with these two turbos. Specifically, I'd like to know if the GTX spools significantly faster and by roughly how many RPNs. I'd also like to know if the GTX will flow close to as well as the SX-E in the mid to upper range on a 12 valve. And I'd like to know if these newer SX-E turbos are more durable than the dual ball bearing turbos.
For the primary I was originally interested in the GTX4202R but that will be beyond my budget. I'm considering an s472SX-E or an s476SX-E to be my most likely options. I will likely choose based on the secondary so that the primary is spooling well before the secondary lets EGTs get too hot.
I have also looked at the K27 for a secondary but I think it would be too large to fit in the limited space of a Ford Excursion, though to fit compounds I expect the primary will have to be high mounted above the secondary. A diverter valve sounds interesting as well but even though they've been out for years I can find very few detailed reviews. Thanks in advance!
