Really? Thats funny because the S15 has a restrictor built into the wastegate signal line to keep a limit on the factory boost level. Id say this is detuning.VG30DETT said:like Carlito said, they don't detune the engines. All japanese car manufacturers "say" they won't go above 276 hp but the cars that they say has 276 have more than that but they will never detune an engine.
Firstly we are not talking about the SR, secondly the SR has almost no turbo lag at all - it uses a T25G which is a really small turbo specifically chosen to minimise lag.sr20det's have great potential but I think the turbo lag on them is horrible.
If you are talking about the T25G on the SR its not a good turbo. It is small and very inefficient at high boost levels. If you are talking about the skyline turbos, a lot of them have ceramic exhaust wheels that delaminate at boost levels above 13psi - which also isnt good. The series 2 R33 GTS-T turbos even have a plastic compressor wheel!If you want to spend lots on upgrading the turbo (which you shouldn't do) then it'll add much more power but cause problems with cooling and probably cause too much stress on other parts. And waste a perfectly good turbo that's already there. I'd also recommend exhaust.