denjil Posted March 8, 2021 Share Posted March 8, 2021 Hi all, I am thinking of swapping my stock twin turbos to an HKS t51r kai. My Supra is a 1998 RZ VVTi manual model, engine is stock. I would like a t51r mostly for the sound, i know this is an old turbo model but no other turbo sounds as good in my opinion. Could anyone from experience let me know what power I could expect from a stock vvti gte engine with a T51 and at what rpm the turbo would be on on boost? Thanks in advance, Daniel Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted March 8, 2021 Share Posted March 8, 2021 At full whack you will see somewhere between 700-800bhp. Advisable to stick some cams in engine and stock cams dont breath well over 6k and the turbo will want to make peak power after 6k. With VVTi, on full boost around 4500-4800rpm Quote Link to comment Share on other sites More sharing options...
denjil Posted March 9, 2021 Author Share Posted March 9, 2021 8 hours ago, Mike2JZ said: At full whack you will see somewhere between 700-800bhp. Advisable to stick some cams in engine and stock cams dont breath well over 6k and the turbo will want to make peak power after 6k. With VVTi, on full boost around 4500-4800rpm Thanks for the info Mike. This is the turbo I am interested in, Can you confirm if this is the older KAI version non BB? Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted March 9, 2021 Share Posted March 9, 2021 @Supraleeturbohas the same turbo, although slightly newer version I think, but still KAI non DBB. At 1.8bar on a non vvti engine with 272 cams he did the following power at the wheels. Basically on full chat at 5k, but getting good momentum from 4.5k. With VVTi I'd expect you would move peak boost about 500-700rpm earlier. Supraleeturbo is going balls deep on a 3.4 stroker and vvti, so will have some data on the future on the worlds most responsive t51 Quote Link to comment Share on other sites More sharing options...
mattdavies Posted March 9, 2021 Share Posted March 9, 2021 21 minutes ago, Mike2JZ said: @Supraleeturbohas the same turbo, although slightly newer version I think, but still KAI non DBB. At 1.8bar on a non vvti engine with 272 cams he did the following power at the wheels. Basically on full chat at 5k, but getting good momentum from 4.5k. Is this turbo running out of steam towards the top end of the graph ? A friend of mine has a T51r on a built 3.0 with 269 cams, i dont have a graph but at 1.4 bar it was making about 640hp at the hubs at Abbey Motorsport. He has bought the turbo not for response just for the noise and the spec list porn Quote Link to comment Share on other sites More sharing options...
Noz Posted March 9, 2021 Share Posted March 9, 2021 Ocdworks sell a modified compressor housing for most turbos. I have one of their own turbos. Which sounds amazing. I've ordered a 6870 with the T51r mod on it. Admittedly been waiting ages due to covid but always keep in mind you can mod the housing to sound just as good. My current 62mm with T51r sounds so nuts I wanted another. Quote Link to comment Share on other sites More sharing options...
Supraleeturbo Posted March 9, 2021 Share Posted March 9, 2021 1 hour ago, Mike2JZ said: @Supraleeturbohas the same turbo, although slightly newer version I think, but still KAI non DBB. At 1.8bar on a non vvti engine with 272 cams he did the following power at the wheels. Basically on full chat at 5k, but getting good momentum from 4.5k. With VVTi I'd expect you would move peak boost about 500-700rpm earlier. Supraleeturbo is going balls deep on a 3.4 stroker and vvti, so will have some data on the future on the worlds most responsive t51 Hey mate I’m only running 264 cams Quote Link to comment Share on other sites More sharing options...
Mike2JZ Posted March 9, 2021 Share Posted March 9, 2021 (edited) 6 hours ago, mattdavies said: Is this turbo running out of steam towards the top end of the graph ? A friend of mine has a T51r on a built 3.0 with 269 cams, i dont have a graph but at 1.4 bar it was making about 640hp at the hubs at Abbey Motorsport. He has bought the turbo not for response just for the noise and the spec list porn I think after 2 bar boost its starts dropping boost near redline if I remember correctly. This is the T51 KAI which is smaller than T51R, T51R is a 1000hp+ turbo, so will make more power but less response compared to KAI Ignore that, forgot the bigger ones called SPL not R. Sounds about right for 1.4 bar. Just checked lee's graph at 1.4 he was doing 620whp Edited March 9, 2021 by Mike2JZ (see edit history) Quote Link to comment Share on other sites More sharing options...
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