[BRX]

I currently have a Greddy Turbo Kit with the smaller T518z turbo. Built motor with 10.5 compression and 3.73 FD. At 1 bar I'm making around 320whp on 93. I swapped the diff to 3.73 because I daily my 86 and drive it on the highway every weekend for at least 4 hours at 90-100 MPH + first gear is horrible once boosted.

The T518z is an excellent turbo for anyone looking to make around 300whp instant boost in any gear even in 6th. Building my motor with 10.5 compression has slightly increased lag and installing a 3.73 rear diff didn't​ help either. Now I'm not complaining, it still spools up instantaneously but I no longer can floor it without down shifting which isn't a bad thing as it forces me to get into the powerband instead of being lazy and just floor it knowing it's gonna spool anyway.

However, I'm looking for more power now but I really don't want to create anymore lag. Target is +400whp. One member here swapped the T518z with a GT3076R (90mm trim, .86 A/R, T25 IWG). He no longer owns a twin and doesn't reply unfortunately but he claimed it spooled just as quick with much more power.

The T620z is definitely gonna spool slower as the dyno sheet provided by Greddy shows and I've read people who have the T620z asking for more power which is what I'm going through now and I don't want to upgrade turbos every year. But since I've made 320 with the T518z I don't see why the T620z can't make 400whp or even 450whp.

Finally there is the SBD500X upgrade kit which claims has the same specs as a GT"X"3076R. No idea what that means and there is no detailed info about this kit other than a 58mm inducer however the GTX series spools a tad slower than the GT series which worries me even more about this kit.

The T620z and the SBD500X upgrade kits are appealing since they're a direct bolt on. The GT3076R does bolt on but I'll need a few couplers, installation kit, oil and water lines, etc. I'll probably reuse the 1 bar actuator that came with my T518z but I'm not sure if it is going to be enough to reach 400whp on the GT3076R.

So my main question is which of these 3 would provide the best spool time to +400whp? No E85 For me as it is not available here.







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