GT28R turbos on stock manifold, value?

[Swampy442]

I’ve posted this set up before, conclusion was it’s an HKS set up. It came with the car when I bought it, 2 new Garrett GT28r’s were fitted by the previous owner.

 Just wondered what it would be valued at?

[mellonman]

Did it still run in sequential mode just curious

[Swampy442]

I never saw them run but Id assume not

[Frank Bullitt]

Bit of history on the HKS kit.

In the early part of 2000 HKS sold adapters to make the GT25 and GT28 turbos work with the stock manifold and stock piping. These turbos were standard upgrades and direct bolt-ins for the GT-R and 300ZX of the same time period. They are also internal wastegate turbos like the OEMs so there wasn't any need to modify the manifold. Small pipes were also fab'd up to route the exhaust gas back just as it does in the OEM setup.

The one thing HKS couldn't ever overcome was the "pre-spool" of the second turbo. When the valve opened up to allow the exhaust gas to pre spool the second turbo, there would be a "shock" to the turbine shaft of the second turbo. At transition there is a massive dip (loss of TQ & HP) then it builds back up. Over time this shock to the turbine shaft caused the second turbo to fail. The system/set-up always worked much better in TTC but made less power and and was no more responsive than a small single on a log-style cast iron manifold.

At the time these turbos were circa $1800 each. Once the turbo blew the cost of replacing it was so prohibitive people just went single and the kits were discontinued.