Here's my side of the story. I bought a TPC20 based off
@Navi recommendation. However, I did not know his 1st TPC20 blew. Had I know that I'd would have stayed away, I think. Installed it late June 2020. Dyno'd it. I put down 380whp/382wtq on pump 93 at 28psi. Tuner called the turbo a pig and said he wouldn't recommend it. UM told me they don't like hybrids in general so not much help there. But they did warn me to not push this turbo any further.
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I drove about 2,000 miles on it. Was planning on upgrading fueling to run e85. On the way to my mechanic, I got the turbo death whine. It blew on the dyno before any fuel mods were done.
Emailed Nick. He offered to replace it for free. But for $500, he'd upgrade me to the TPC38BB. Which I agreed to. Why? He said he was aware of the TPC20 issues and fixed it. And the TPC38BB was brand new and the ball bearing aspect of it truly appealed to me. And for $500, sure. Why not? Asked me to not show any pics of the TPC20 failure on the forums. Which I also agreed to. Told Navi and then he mentioned his first TPC20 blew before I got mine. And that Nick also told him not to say anything. Which then kind of pissed me off. Why did we agree to not say anything? That felt weird.
Got the TPC38BB by end of October 2020. Put it on with additional fueling mods (lpfp, 925cc mpi, fuel line, e85 flex fuel tune) and I put down about 470whp/415wtq on TWO different dynos with about an e60ish blend at 28psi. Nick constantly says there's something wrong with my car. That it should be pushing waaay more. I shared my results on facebook and it created quite a stir! Nick began to post dynos of other TPC38BBs but did not share mods. Later to find out they were all running upgraded 4/5 bar map sensors so not apples to apples by any means. I have also been able to cut an 8.99s 60-130mph on all-seasons during winter.
Facebook thread here for amusement:
https://www.facebook.com/groups/TexasVWMK7golf/permalink/3836064723079413
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UM has warned me not to push this TPC38BB turbo any further as have the two various tuners that did the dynos. Nick says I should add 4/5 bar map sensors and push this thing to 32psi and I should be able to put down the same numbers above on pump 93. I dunno.
Car pulls pretty great on with some e85. However, I do hear faint turbo death whine when turbo is warming up around 8-10 psi. Imagination? I sure as hell hope so. It eventually goes away but my nerves are shot as I forever fear this popping! Only time will tell. Only got about 3,000 miles on it.
That's my story. Thanks.