Only during the break-in period Freddan.

AFAIK, for a re-built engine and during break-in period, it is preferred to use mineral oil for proper seating of piston rings. Mineral oil has low lubrication and hence high friction which helps the rings seating.

Quote from Wikipedia on one of the disadvantages of synthetic oils:



Anyway, after the break-in period (which will be around 1,500km), I'll use a fully synthetic oil, most probably Mobil 1 15W-50.

Thanks Ismo,

Actually, the HKS DV has the bose for the recirculation (see red circle)



I think they have connected it by now. Need to update photos everyday now

Hi,

It is not that vacuum pipe, look on the other side of the reed circle.. now the blow off valve releases already measured air (by air flow meter)to atmosphare.
That air should be captured and routed back to indcution pipe just after AFM
(not before, check my earlier post and check the direct induction pipe picture)in cars which has Air Flow Meter in the induction pipe.


1. So, first you measure how much the engine will have air by AFM - right?
2. Then ECU measures how much gasoline will be released to the engine by injectors - right?

If you blow off part of the already measured air by air leak or by blow off valve, engine will run very rich for a while - right?

So, that was why I recommened to modify HKS to bypass mode (very fast and easy job to add that bypass pipe to you HKS.

So, without bypass mod you car will run, but for my experience it is annoying hesitation without bypass modification.

I am of course wrong if you are not using anymore AFM and you are running aftermarket ECU with MAP sensor.