I have a greddy 15g (internal wg) kit on my 94 civic ex....I am using a apex'i avc-r to control the boost off of the intake manifold (pcv hose). I spike when I shift into a higher gear while racing (up to .85 when set to .7), now it doesn't really spike when the boost controller is set to .5 kg/cm^2, which leaves me quite confused. So I'm wondering if anyone has any help/tips with this ebc, or with boost control (ie....spiking....holding pressure)

btw, does the avc-r's start duty only effect the boost at the start of each gear?....if so, how long does it last?

and I searched these issues for a little while...and yes I did find answers there, just not all of them....

Thanks,
Rick

 

Make sure on the AVC-R that you are setting the duty for the static boost setting to a level that will work and hold the boost level that you want. I had some issues with one on DSM similar to this the first time I used one.


[Modified by integra_gsr98, 3:23 AM 12/23/2002]

 

maybe try puttin the line to the side of the coompressor, that way the wastegatw will open sooner so your engine wont see any spikes.... You know what i mean???

when you have the wastegate hooked to the intake manifold the spike has already hit the engine by the time the wastegate starts to do its job.... it would be like me punching you in the face, THEN you ducking... instead of ducking before i swung...

get it????

just a tip...

 

Yes, i would run the vac line off the side of the turbo. That was good advice.


The nice thing w/ the avcr is you can control boost at different rpms, just lower the duty at whatever rpms you are spiking, but switch the vac souce first.

Let us know how that works for you

 

The boost controler should be as close to the wastegate/turbo(internal wastegate) as possible. This will get rid of the spikes. Try putting the boost controller in the vacc. line between the wastegate and the manifold. If this does'nt work you may have a bad wastgate.

 

The first thing you need to understand, is that the internal WG of the TD04 is ***, it sucks horribly. Anything over 8-9psi for me and I was having almost uncontrollable spikes even with my AVC-R setup perfectly. I tinkered with it for a year before I finally realized it was the WG causing the headaches.

Next, the way I originally had the WG setup was as GReddy instructs with the wastegate actuator running directly off the little vacuum port on the compressor. I capped off the little port on the compressor and ran a vacuum line from the intake manifold to the wastegate actuator so that the WG wouldn't open before it saw actual boost rather than what the compressor generated before boost drop. Doing this helped ALOT! I saw much quicker boost response and no more boost drop whereas before I'd always drop like 1.5-2psi from where I had it set and the AVC-R would end up fighting the WG to generate enough boost.

However.. this still doesn't change the fact that the WG itself is horrible for higher boost levels. I could set 5,6,7psi with no problem, but by 8psi I would start to get a little erratic boost with the AVC-R fighting to keep it level, by 10psi it was getting pretty crazy with spikes up to 13psi, and at 12psi it was downright scarry to see 1bar+ o nthe AVC-R screen. So my adivce, reroute the vacuum lines on the WG actuator and keep the boost under 8psi for daily, maybe 10psi for track duties but I wouldn't go higher on that POS WG.

 

Although you may see actual boost by running the vac line to the intake manifold, its not as safe. I used to run it like this, however, i had a boost leak i didnt know about it, and was only seeing 4 psi, since the wastegate was only seeing 4 psi, the wastegate was not opening, and the turbo was over boosting, which causes severe strain on the turbo.

 

If you're seeing less than you dial, that alone should be enough to tell you there is something wrong and have you back off the throttle. I however suggest running the WG off the manifold to give you an accurate reflection of what you are doing. IMO it's far more dangerous to play a game of "bouncing wastgate" than risk a leak in the line somewhere and cause less boost than desired.