![]() You will piggy back (or in some cases disconnect) the factory boost controller (vacuum solenoid) and install the Chip Tuning Dawes Valve. So to cover all bases regarding i recommend the following. ![]() No two vehicles are exactly the same and circumstances change for each vehicles however this is what I have found not only in CRD Nissan Patrols but now also in other late model Variable Vane Turbo vehicles that have the vacuum solenoids operating the turbo vanes. In the mean time I removed the factory VNT turbo and fitted out aftermarket stage 3 turbo now and this has the more reliable mechanically operated wastegate. Fitting a Dawes Valve ($69 see online store) will smooth out this issue. This is NOT desirable for engine longevity. This was traced to the factory vacuum solenoid or the factory emissions control (not sure which one) bringing down boost to increase the exhaust temps. When the boost decreased the EGTs increased to around 600deg Cel. I found in my own Mitsubishi NS Pajero that whilst at cruise on the freeway the boost would fluctuate by 3-7 psi. This will also remedy any power surges & EGT spikes when vehicle is fitted with a Performance Diesel Chip that is a result of the Diesel Chip reading a boost increase/decrease and therefore varying the fuel volume. This is to help solve the boost drop off seen in the factory setup.
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