Anyone heard of this clutch: stage 2+, pn SP903H-3


Also, any thoughts on replacing the flywheel as well? I would like to avoid this if at all possible because it's another $1000k

 

You don't have to replace it. But trust me when I say a lightened flywheel will transform your car. The car will be more responsive, as well as, rev matching will be easier. As long as you can live with a little transmission NVH .

 

so the flywheel's probably fine but an upgrade is worth it? also, excuse my ignorance but what is "transmission NVH"

 

NVH = Noise/Vibration/Harshness. The stock flywheel is fine, unless you want to maximize the responsiveness of your car.

 

k thx

 

follow-up: I was in fourth gear at 5rpm and hit the gas and the revs would not go up and no power. it was like I hit a limiter. second time this has happened. anyone know why this would be?

 

Could be any number of things... bad ECU tune, detonation/timing retard, throttle sensor anomaly. Really hard to say. Is it only in that gear at that RPM?

 

yes, I have only noticed it in 4th gear at 5rpm

 

Can you get Durametric code? Might be a soft code. This will help guide us in the right direction.

 

just had the codes ran. nothing came up... probably a tune issue?

 

The best way to be able to pinpoint it is to data-log while replicating the problem. Outside of a bad tune, I've seen 2 different cars in the past 2 months exhibit a similar symptom but it was independent of which gear is was in. That pointed to a faulty crank/cam sensor.

Without having a ton of data, I'd say you are more looking at a tuning issue. Does it break through the barrier if you roll into the throttle slowly (vs. WOT)?

 

Agree with Marco. You may need to send back your ECU to VF-Engineering

 

yes it breaks through if I roll the throttle slowly

 

Yeah, really sounds like a tune issue. Like 808c2s suggested, probably time to ship the ECU back... or at least give them a ring first.

It really could be any number of tuning items, but based on what you're saying sounds like something is goofy with the fuel on the VE side of things. WOT at 5k RPM puts you at a different manifold pressure than partial throttle at that RPM... indicating the tune is probably out of whack at whatever manifold pressure/engine speed combination you're at in 4th at WOT.


Will they provide a dyno chart with AFR for you for your particular setup? If not, it's probably worth doing that once they fix the issue. A GOOD tuner (individual or company) will check every operating range for appropriate ignition advance, AFR, and injector duty cycle (among other things). I'd be cautious that if you found one bad point on the graph, there may be a second.

What part of the country are you in?

 

I'm right outside of Portland Oregon. I can ask for a dyno. I have a feeling its the tune as there's no codes coming up.