RotorJoe

I know this sounds stupid, but what is the lowest boost you guys can set on the non seq twin turbos? I thought it was about 7psi. Now I have to mention my motor is ported and they are the stage two BNR twins. I also think, but am not sure, that the waste gate is ported.

I am having issues with my HKS EVC IV and I had to make it re-learn. Now I can only hit 10psi as my lowest setting. Although my high end 1.10 of a bar is solid.

mad_7tist

1.1 is pretty high on the twins and a bit out of the efficiency range...

jimlab

Note that he said they were Stage II BNR twins.

The stock wastegate actuator opens at 7 psi, so if the output of the stock turbos were directed to the wastegate actuator with an unrestricted vacuum line and none allowed to bleed off, 7 psi maximum boost would be the result. However, with more efficient twins, it's possible that 10 psi might be the "lowest" maximum boost you could achieve, even with a ported wastegate.

mad_7tist

/\ good call. sounds about right with better reading

Bucrx7

I have stock twins non sequential with the HKS EVC IV without learning and it controls boost fine. I spoke to James at HKS and he said it doesn't really make a difference for the controller to learn or not. When I turn off my boost controller I get a solid 7 psi, what do you get?? Since you have more flow so you might be overwhelming the wastegate.

evot23

iTrader: (17)

NS stock twins and 7 psi with profec b off.

RotorJoe

I get .80 of a bar with my HKS EVC IV set to .50 of a bar. This is the lowest the HKS will let me go after it learned. Now I can set it to 1.0 or even 1.1 and boost that just fine with no creep. Before I was able to set the HKS to .20 and hit .50 of a bar. For high boost it used to be .50 or .60 and I would hit 1 bar of boost. That was why I made it relearn because I didn't think it was acting right. Now I have checked my three boost read outs and the are all darn close to each other (PFC, HKS and Blitz boost gauges). I have my PFC set to 1.10 on the PRI and SEC with duty cycles of 64 (PRI) and 56 (SEC). The duty cycles have increased from 50 (PRI) and 40 (SEC) which may be part of why I can not hit .5 of a bar any more. Still learning the PFC and how it controls boost. I may play with my duty cycles more and see what happens. The other thing I will try is resetting the HKS EVC IV and not send it though a learn process.

Thanks

Bucrx7

Also tring adusting the "offset" feature on the hks evc. At first I was getting boost creep but when I set the offset to 112 it is a solid 10psi now.

RotorJoe

Thanks.

I reset the HKS EVC IV and set my low boost at .2 of a bar. At that setting I would see about .8 of a bar. When I switched it to the high setting which was set at 1.00 of a bar, the boost jumped up to 1.4 bars. Wow. I think that was the max my MAP would read and darn close to if not at the limit of the stage two twins. I have also been having a slight hunting idle and once I reset the HKS EVC it settled down. Maybe I was bleeding exhasut gases out the waste gate and it was affecting the idle? Now with the HKS EVC off I see about .2-.3 of a bar all the way to red line. So I know I can set .5 of a bar for my lowest boost setting. The other weird thing is with the HKS EVC off I though the PFC would control boost but it doesn't. I will send the HKS back through the relearn process, because maybe it was still a little off the first time I did it. It's tough to find an open road that you can do third gear red lines in. Then over the roar of the engine you never hear the beeps of the HKS EVC.

Thanks for the input it sounds like I need to make it relearn and do it correctly this time (first time I may not have hit red line at the low setting) and then play with the offset of the EVC.

rynberg

How could it? If you installed the EVC correctly, the line running from the stock solenoid should be capped off and not doing anything. The whole point of running an electronic boost controller is NOT using the OEM solenoids to control boost!

The only boost control settings that should mean anything to you on the PFC are the target boost settings, so that the PFC doesn't fuel cut on you.

RotorJoe

Well, the car came with the EVC installed. I have just always had issues with setting a boost value and actually boosting something different. I guess it sounds like the EVC was installed correctly. I will check to make sure the line off of the stock silenoid is capped off. Thanks.

So changing the duty cycles of the PFC are not go have an affect on boost in this case?

1QWIK7

iTrader: (33)

my boost controller is set at 8psi at low so thats what im running right now

rynberg

Again, how could they? The PFC uses the stock solenoids to control boost, which are disconnected for a boost controller install. You definitely want to make sure the line from the solenoid to the wastegate actuator AND the nipple on the actuator are BOTH capped off.

RotorJoe

Thanks

spurvo

Just as a slightly post whorish reference, I'm currently running my stock sequential twins with no restrictors in the control lines. I get ~8.5 PSI, a slight surge at transition (say 9 psi), then back to 8.5 psi. I have stock intake with K&N filter, Pettit DP, stock unclogged cat, and RB dual tip cat back. Plenty fast for me! (too much damn traffic)

RotorJoe

Ok everything is working properly now. Most of my problem was I blew off small boost hose that went to the BOV and it was T fitting which also ran to my blitz boost gauge in the car. Hooked that back up and placed a small zip tie on those. Sent the HKS EVC back though the relearn and now all is fine.

Thanks