Originally Posted by manitou
The GTX3576 will spool sooner that the standard GT3582R and have as much if not more top end power. The spool of the GTX3576 will be close to the spool of the GTX3076 and it will have more top end power. The wheel pairing of the 3576 is made for our 2.5 liter motors. I like it better than the 3076 with the 68mm turbine wheel vs the 60mm wheel of the 3076.
I am running the Blouch version of the 3576,the Dom 3.5XTR. The difference is the Blouch stock location version uses a 64mm turbine wheel (a wheel that Garret developed but does not use on any current models), Garrett CHRA vs the 68mm turbine wheel of the GTX3576. I am slightly handicapped by the stock location intake piping and compressor housing but have found that my set up spools as fast or faster than most of the Dom 3XTR's and makes more power. I made 400 ftlbs. at 4200 in 4th gerar on the PnL Dynojet with conservative timing because of some crappy unbalanced injectors I had installed at the time of tuning. After I sorted out the injectors and installed the ID 1k's I was making 28.4 psi (420 ftlbs.) at 3640 rpms in 4th gear and carrying 28 psi all the way out to my then 7800 rpm redline with no taper at all.
I know this is the Dom 3.5XTR and not the GTX3576 but really the the 3576 should perform better than my 3.5XTR given all the same conditions on my build. They should be the same price as the GTX3076 and more than the GT3582R. I would just shop around.
Totally agree with everything. I would like to add that most don't see the same type of gains going from a gt3076 to a gtx3076 as the rest of the gtx family has seen. This is due to a maxed out 60mm turbine wheel. With the release of efr7670, garrett put together the gtx3576. Not a lot of data out there on this turbo. I've talked to a few guys that have switched over from a gtx3076 to the 3576 and they say spool characteristics are withing 200 rpm and have seen substantially more power up top. But, the turbo is a little more the the 3076 which may be a factor for some. The OP sure made some good power with his gtx3076.