HKS EVC IV offset function - who's used it? what does it do?

[sebaz]

Looking at a new boost controller after my second hand Greddy crapped itself.

In particular I want an EVC that allows me to spike the boost down low to get on boost quicker then return to normal controlling functions of an EVC from then on.

With a phnumatic system this can be achieved and many do it.

I've actually never seen or heard of this feature being available in an EVC till I read about the "Offset function' in the new HKS EVC IV.

check it out: www.hksusa.com

Has anyone used this or someone having experience with the EVC IV please tell me exactly what this "offset function" does?

Apparently its different from the older HKS evc 2 and 3 that purely looked after boost level stability.

It can apparently control boost response as well.

Any help appreciated.

Thanks,

Sebaz

[GTRman1992]

I have one and have had the boost curve plotted on a dyno. It basically looks the same as what a bleeder does (I had the bleeder curve plotted on the dyno as well). The boost rises fast, goes over the target boost slighly then settles back down at the set boost. Same response as a critically damped second order control system.

Really easy to set-up as well. Just two identical runs in learn mode.

[GTR-Ben]

The EVC II and III are almost identical to the VI apart from the dial..

The offset function starts at 100. If you wanted it to spike slightly wind it down under 100 and try it. If you don't want it to spike (what it's really used for) set it over 100.

What I would do if I was you would be to use the pass mode. There is a 4 wire plug at the back, 2 of these wires when crossed trigger the pass mode. This is setup with a certain "overboost" setting, and for how many seconds it goes.

Just wire up a switch. (work out the 2 wires..) and then hit the button on take off and have it set for 2 seconds or something..

I had a button on my gear knob.. but going from 12psi to 18psi by accident while passing.. can get hairy.