TitaniumTT's I hope I make it to DGRR '09 Build

[TitaniumTT]

Originally Posted by scotty305

Very interesting. I've also got a standalone that will allow me to control these valves independently, and so far I've got the CCV, CRV, and TCV solenoids all switching at the same RPM (4000 works well so far). At low RPM, the WG solenoid is about 90% duty and the PSV is used for boost control.

First, which standalone are you using?

How is your WG plumbed? If you are lowering duty to increase boost, I would think about changing that around. That is the original way I had it but upon more thought, I decided it was a bad idea. If the solenoid goes dead for whatever reason, your boost will spike out of control after the transition. Before the transition, you're right, the PSV does a nice job of controling boost, this is exactely how I have it. I would like some sort of closed loop feedback and I am still toying with it.

Originally Posted by scotty305

Your post above suggests you might be opening the CCV before or after the TCV and CRV?

Yes, I am opening the CCV partially and beginning to close the CRV before the TCV kicks over. It's all based on RPM's and TP at this point. I may take a break and revisit it in the spring but right now, it's damn smooth. On low boost the transition is virtually flawless. In highboost though it's more like a 12-12-15 pattern and when that 15 hits, traction is gone in 1st and 2nd by 4200 and in third around 6 it usually breaks loose. These are RT615's sized 255/40/17.

My low boost and high boost can be adjusted with a dash mounted 9-posotion mini switch. I love the MoTeC

Originally Posted by scotty305

By the way, regarding TPS-based boost control, I've heard of tuners using this as a way to compensate for throttle airflow saturation. If your throttle allows about the same airflow from 70-100%, increasing the boost target at 80, 90,. 100% is one way of giving the throttle a nice linear feel. I've tried this on my car and the feel is pretty nice... I imagine it's a bit more important with big-power cars like yours, mine isn't even putting 300 to the wheels.

Yup, that's exactely how I have it setup. My MoTeC guru gave me that little tip to linearizre the throttle. You're right, increasing the throttle from 70-100% has little to no effect on the power to the ground. By adding that axis in the boost control, it gives a much more linear pedal. Right now, the table is just that, linear. At lower RPM's it doesn't do much because of the WG spring, actuation etc etc/ I need to play around with it a little more. I think in the end it will look more exponential until 5k and then level off. We shall see.

I'm interested in your project. Care to share a little?

[scotty305]

I have an AEM EMS, stock wastegate, stock solenoid and vacuum routing... I think higher duty cycle yields higher boost. I'm not completely sure; there's an 'invert duty cycle' option in the software so I might have enabled that and forgotten about it a while ago.


I hadn't thought to control the solenoids that way (it's my understanding that the stock ECU switches them all at the same RPM), thanks for the info.


Didn't mean to distract from your thread, more info about my setup here:
http://rotarycarclub.com/rotary_foru...ead.php?t=5496