The sound is definitely different. Not sure if its an efficiency thing or what but for light throttles its definitely making less noise and probably a little less boost but hitting it at 2200rpm in 3rd I was in boost almost immediately and at 10psi by maybe 2600-2700 rpm.

The only BOV I've had that never surged was an uncrushed 1g BOV with the Dejon stop leak kit. I have the stop leak kit for my IX valve but I think the spring is just too stiff on the IX valve and may always surge. The 1g valve is much softer leaking a lot down around 17psi but the stop leak kit makes that more like 35-40psi. We might have to make an adapter to play with

Perfect response and smooth transition is the dream, I'm sure with some passive controls we can get there better than static settings. Just need the configuration right.

 

Got the synapse DV installed and pressure tested last night. I'm running it in push mode because I think it makes more sense for controlling surge with the soft spring @ zero preload and port b to the manifold.


In my short drive to work today I could not make this thing surge. Not at high rpm with slow lift, low rpm freeway slow lift, or just normal driving. Pretty impressed so far but we'll see how it does with tip-out during the autoX this weekend.


Pressure testing, as I stated before, even the stock crushed valve would leak around 25psi for me. I tested this to 35psi and I'm getting nothing out of it which makes sense since the area in port B is bigger than the valve area.


Turned the boost up a half turn to get an idea of the boost change/turn, it went up to 22psi with no spike or taper. Felt strong but definitely needs some tuning time.

 

Good to hear it's working on the street. After experimenting with several others, I've decided to get back into the Synapse.

 

I think Aby makes a softer spring for this, at least he used to.

 

From what I gather, the soft spring shipped with the valve was in response to some people selling one for it. So they just give you both now, firm and soft. Supposedly soft is for higher boost and bigger turbos.

 

Any dyno charts?

 

Working out the details to get it dyno'd this week but Ill probably keep it to 25-27lbs for now. I still have a few things I want to get done before cranking it higher.

 

Dyno scheduled for Wednesday at 3pm but don't expect any record numbers. It'll be 95deg ambient and I'm just shooting for a reliable tune and flat torque curve.

 

I am more curious to see the powerband. See if your tuner will run it out to 8k (assuming you are ok with that).

 

JohnBradley (Aaron) at ER is tuning it and we'll run it out to 8k since I need to make sure its ok at that rev for speed in 2nd. Im guessing power will fall off pretty good by then with the S1 cams.

 

Sorry if I missed this but did you get the 1.0XT or the 1.0XTR?!

 

1.0XTR. I haven't ever seen any dynos for this or the full BB but knew I wanted the BB center for transient response on track

 

Here's my conservative tune numbers. Boost peaked 28psi and tapered to about 23psi and it was over 90 with 30% humidity. I'm sure I can work on duty cycles to get the top end to hold boost but for now its safe enough for the tour/pro the next two weekends.

The second plot is from stock motor/turbo/cams/fmic. I like that with the 2.3 and bigger turbo, the plot just moves up. No loss in spool or top end. Just more everywhere.

 

Do you plan on turning it up more in the future?

 

Probably not, I don't drag race or anything and care more about a big flat torque curve and not boost spikes. So if redline wont hold 30psi then I wont spike over that.

In autox, torque spikes just break parts and is harder to drive. Big, flat, seamless delivery is the goal.