I never claimed that TPC turbos are the best. There are a lot of good choices out there at the moment.
I have no regrets with my TPC25. Spools quick, carries out boost to 7400 rpm. TPC38 flows better without sacrificing hardly any spool which is why the TPC25 isn’t being offered anymore from my understanding.
I came from a Mabo m480h which was at 90% wgdc @ 28psi and couldn’t hit 28 psi until 4400 rpm in 3rd so the TPC25 was a major upgrade.
Ultimately anyone buying a turbo should do their due diligence. I contemplated whether I should add my experience with TPC in this thread. I’m not here to get in a pissing match with anyone. I came in with real data, which was the ask.
My turbo puts in work. I installed it myself, performed a boost leak test, filled the chra with oil before starting. I did everything by the book. There are a ton of people out there whose “builds” are cobbled together and marginal at best. People who are quick to blame the turbo when there is something else mechanically wrong. I think it’s fair for any turbo company to ask you to perform boost leak tests or smoke tests to rule something simple out before absorbing the cost of returning a turbo and sending out a replacement.
But that being said, a company should stand behind its customers and its product. Communication through the process should be respectful. Paul at TPC has always been super helpful anytime I have had questions.
The current 38’s and 770’s with performance housings work well. I don’t know where the 40psi comes into play on the 770’s. Based on my wgdc I’m sure I could try to tickle 40 psi on my tpc25 but it won’t flow as much as the 770 will at the same pressure.
Based on my personal experience I would buy another turbo from TPC.
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post was only made big, by you guys crying about it though. It was dead silent for almost a yr, until I posted my logs which seems I have the same witch hunt issues. We aren't gonna find out how many more cause as soon as we found 2 everyone started crying. 
