ND1 E-Boost40 boost controller reading 5 psi high

Silverguy80 — Sat, 16 May 2026 15:26:32 GMT

I have 2017 ND1 with BBR GTI turbo kit out of Europe. It runs E-Boost40 boost controller and E-Boost40 is reading about 5 psi high compared to my boost gauge.
EB40 used to read -16 vacuum at idle and i think was accurate. Now it reads just zero except at start up it reads -5psi. Cruising it reads a few psi. Pretty sure should show vacuum when cruising. Like I'm almost certain boost controller is faulty or something. I reset the EB40 boost controller already and nothing changes. So max boost captured on boost controller will be 5 psi high compared to max boost on the boost gauge and 5 psi high almost always. Is there some trick I don't know of? Or is my boost controller faulty and shot? Any advice is greatly appreciated.

Turbo options for MKturbo kit

Robh22 — Tue, 07 Apr 2026 00:42:30 GMT

I am wondering what options people have used to replace the turbo that comes with the MKturbo kit.

The threads came out of the aluminum compressor housing when I tried to tighten the clamp. The fins are also not looking great.

I have a 1994 with stock internals, but i would like to get into a couple tracks days a year. I was wondering what people are using or if there are better options that won�t break the bank.

I emailed Lars last week to inquire about a replacement but haven�t heard back yet. I figured I would see if anyone here has any suggestions.

TIA

Miata Turbo Forum - Boost cars, acquire cats. - Prefabbed Turbo Kits

ND1 E-Boost40 boost controller reading 5 psi high

Turbo options for MKturbo kit