How does the FP black, BCP 500r, Grimmspeed Bb500 compare to those turbos? Not looking to go crazy high rpm’s will prob do mild cams valves and springs maybe a mild port job nothing crazy on heads. I have 2 sti’s a 18 and a 04, I’m going to build the 04 bigger faster later on. The 18 is my DD and would like to stick with stock location if possible.
I just don’t want to want more turbo later on and waste money doing it more than once. I know stock location turbos have came a long ways last few years. Bader is able to get great numbers 500-600+ pretty easy, but like you said this will be a street car and I’d like decent response with good top end. Thanks
the FP black is laggy too. my old roomate had an FP red, which made 423whp on pump gas. I have a blouch 20g, which makes 377whp on pump gas. drag racing, he outran me. driving his and mine, both of us agreed mine was significantly more fun to drive on the street, because of how much faster it came on. and the black was bigger than the red iirc.
so far as grimspeed and bcp, i'm not familar with their lineup. on paper they look good, but for the size, i'd guess they are laggy too.
while turbo tech has advanced, the issue isnt the tech, it's the stock location type housing that is restrictive. which is why i say go rotated or aim for a smaller power number. yes hitting 500+ on a stock location turbo is not hard at all, but there's only so much you can do about the restrictive hotside which is the choke point for stock location turbos.
back when i was at mach v, for stock location the blouch 1.5xtr seemed to be one of the favorites. you could get mid 400s on their dynojet on e85, and it would spool fairly quickly. the 2.5 was too laggy for my taste, but alot of people liked it. it could hit in the 450-475sh range while still spooling fast enough that it was fun (this is also on ethanol). the 2.5 was approximately the same as a garrett 3071 size wise. the next step up, blouch dom 3 was almost always laggy, it was similar to the 3076 and slightly laggier, but would still be decent in a track setting where the rpms stayed up. many people liked that turbo as it would make the big numbers (upper 400s, low 500s if pushed).
personally, if it's a DD, and you want to keep it reliable long term, your best bet for fun is a 20g and top it at about 350whp on pump, 400 on e85. it's more than what you'd ever need for a dd and a stock motor will last quite a bit longer than a built one without needing a refresh.
if you must build it, and are adamant about not going rotated, i'd personally go no bigger than a 3071 size, and expect to be under or right at 400 on pump, and maybe mid 400s if you are lucky on ethanol. this will be faster spooling, but still will spool in the 4300 ish range i'd guess. giving you at least a little bit of usable powerband. if you did cams it may push the powerband a bit to the right. i personally wouldnt if you arent raising the rev limiter by a bunch. stock cams do really well.
i know it's a pain and probably not what you want to hear, i have driven/ridden in/helped build alot of setups, and once you get past the 450ish whp range on e85, getting rid of the oem hotside is a must to not have crazy lag and making the car less fun to actually drive.
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