If you've purchased a TPC20 (and maybe TPC25) recently, and it's not making boost as it should, you should contact TPC immediately. I've been made aware that they've recently sold some turbos which have improperly machined compressor covers. The bad compressor covers would make reaching target boost difficult or impossible for the turbo. Trying to reach target boost on a turbo with this problem will overspin the turbo and will likely result in catastrophic failure of the turbo and possibly your engine.
My own TPC20 turbo had this problem. Boost response was sluggish and it was requiring a lot of wastegate to make boost. I was told to do boost leak testing etc. A lot of time and money was wasted installing the bad TPC20, then boost leak testing it, and then swapping it for a Vortex (which works great). That was 9 hours of travel time alone lost there. Hopefully, TPC won't make everyone go through the whole boost leak testing thing. I assume they can tell who has a bad turbo by the serial number? It seems they are reluctant to reach to to people that purchased these bad turbos, but relying on people reporting it to them. I'm posting this to make any TPC customers aware of this issue. Today was the first time I heard of this issue, and it may be yours also.
Please spread the word to any TPC owner you know who has bought a turbo in the last year. I know of 770s that have had similar problems also. I was hoping TPC would be proactive and reach out to people who purchased bad turbos, but based on my direct conversations with them, this doesn't seem to be the case. They are making claims it's all been taken care of, yet I again personally know of one person with such a bad turbo on their car and waiting for resolution.
To anyone currently thinking of buying a TPC20/25 type turbo, you're probably better off with a Vortex. Anyone looking at the 770, the Mamba 3076 units seem to be great for the price. Mamba seems to have great support, and Vortexs just seem to all work right now.
https://golfmk7.com/forums/index.php?threads/best-low-end-power-turbo-upgrade.410487/post-7898080
My own TPC20 turbo had this problem. Boost response was sluggish and it was requiring a lot of wastegate to make boost. I was told to do boost leak testing etc. A lot of time and money was wasted installing the bad TPC20, then boost leak testing it, and then swapping it for a Vortex (which works great). That was 9 hours of travel time alone lost there. Hopefully, TPC won't make everyone go through the whole boost leak testing thing. I assume they can tell who has a bad turbo by the serial number? It seems they are reluctant to reach to to people that purchased these bad turbos, but relying on people reporting it to them. I'm posting this to make any TPC customers aware of this issue. Today was the first time I heard of this issue, and it may be yours also.
Please spread the word to any TPC owner you know who has bought a turbo in the last year. I know of 770s that have had similar problems also. I was hoping TPC would be proactive and reach out to people who purchased bad turbos, but based on my direct conversations with them, this doesn't seem to be the case. They are making claims it's all been taken care of, yet I again personally know of one person with such a bad turbo on their car and waiting for resolution.
To anyone currently thinking of buying a TPC20/25 type turbo, you're probably better off with a Vortex. Anyone looking at the 770, the Mamba 3076 units seem to be great for the price. Mamba seems to have great support, and Vortexs just seem to all work right now.
https://golfmk7.com/forums/index.php?threads/best-low-end-power-turbo-upgrade.410487/post-7898080
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