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Guys,
The following are quotes out of this month's issue of Sport Compact Car. It is an excerpt from their article on a 300ZX project car. Please read:
"HKS encouraged us to try its current, state-of-the-art boost controller, the EVC 4. We were reluctant because the EVC 4 is a fuzzy logic, self-learning type of boost controller. Past experience has told us such controllers don't work well when the controller's stepper motor is mounted a long way from the wastegate actuators. We're not sure, but we think the added volume and/or elasticity of the long lines to the wastegates create volume fluctuation and whack out the boost controller's magic box. In the past, this has caused us uncontrollable boost creep and inconsistent boost levels.
The EVC 4, however, can be operated with the fuzzy logic, self-learning function turned off. After numerous futile attmpts to get the EVC to learn our car's boost curve--which meant a lot of 2 a.m. runs down abandoned streets--we turned the fuzzy feature off and manually calibrated the EVC by adjusting the controller's offset function. This was much easier. We recommend that any twin turbo owner skip the self-learning crap and proceed to this step in the instructions. You'll save a lot of time.
Once we figured it out, the EVC 4 did improve our turbo boost response and reduced transient lag (vs the original EVC).
We can actually feel the difference in response from the old EVC, even at stock boost pressure levels. As a plus, the EVC 4's control valve is much faster than the early EVC, which should allow for more precise control."
Has anyone out there ever done this? My stepper motor is mounted underneath the fuse box in the front of my engine compartment. I am concerned because my Greddy Boost Gauge has been measuring some scary, boost spikes. If I have it pre-set for 1 bar, it may hit 1.2 or 1.3 bar.
I would try to do the same as the guys did in the magazine, but the snow is flying in Erie, and my car is in hibernation for the winter. Does anyone (Southern guys) want to give this a try and post their results?
Sorry so long, but I thought this was an interesting topic. Jim
The following are quotes out of this month's issue of Sport Compact Car. It is an excerpt from their article on a 300ZX project car. Please read:
"HKS encouraged us to try its current, state-of-the-art boost controller, the EVC 4. We were reluctant because the EVC 4 is a fuzzy logic, self-learning type of boost controller. Past experience has told us such controllers don't work well when the controller's stepper motor is mounted a long way from the wastegate actuators. We're not sure, but we think the added volume and/or elasticity of the long lines to the wastegates create volume fluctuation and whack out the boost controller's magic box. In the past, this has caused us uncontrollable boost creep and inconsistent boost levels.
The EVC 4, however, can be operated with the fuzzy logic, self-learning function turned off. After numerous futile attmpts to get the EVC to learn our car's boost curve--which meant a lot of 2 a.m. runs down abandoned streets--we turned the fuzzy feature off and manually calibrated the EVC by adjusting the controller's offset function. This was much easier. We recommend that any twin turbo owner skip the self-learning crap and proceed to this step in the instructions. You'll save a lot of time.
Once we figured it out, the EVC 4 did improve our turbo boost response and reduced transient lag (vs the original EVC).
We can actually feel the difference in response from the old EVC, even at stock boost pressure levels. As a plus, the EVC 4's control valve is much faster than the early EVC, which should allow for more precise control."
Has anyone out there ever done this? My stepper motor is mounted underneath the fuse box in the front of my engine compartment. I am concerned because my Greddy Boost Gauge has been measuring some scary, boost spikes. If I have it pre-set for 1 bar, it may hit 1.2 or 1.3 bar.
I would try to do the same as the guys did in the magazine, but the snow is flying in Erie, and my car is in hibernation for the winter. Does anyone (Southern guys) want to give this a try and post their results?
Sorry so long, but I thought this was an interesting topic. Jim
