can't wait for mine.... it's at performance nissan getting put on as we speak!!!!!

 

Just got mine back today, went from 2 to 4, and man it's a beast. The extra horses and torque seem even more than what is claimed.

Ask away if you want to know what I have done to mine. What I have installed hollar at me. But it is well worth the wait.

 

Does anyone on this thread have before and after dyno's going from Stage 2 to Stage 4? I had the Stage 4 upgrade installed about a month ago. was running Stage 2 previously. Unfortunately, i saw virtually no change in my dynos after the install. I dynoed at 296 HP and 276 TQ with Stage 2 and 289HP and 280 TQ with the Stage 4. Both HP and TQ curve are basically unchanged from 2,500 to 6,000 RPMs. I'm also generating only about 6 lbs of peak boost instead of the 8 or 9 i should be seeing. As i posted on another thread, Stillen is suggesting that I reinstall the smaller 7th fuel injector and control box from the stage 2 setup to see if this helps, as i'm evidently running a little rich and they think that might be part of the problem.

 

That's odd. Yes you will run a bit more rich with the stage 4, since Stillen tunes it conservative to be as safe as possible. However on my car, I too noticed a huge difference.
What were your water temps when you dynoed and what was the ambient air temp and intake air temps, if you happen to know them? This can play a HUGE role, since this particular type of blower creates a lot of heat, and heat soak can be an issue.

Also, I do not see why running rich would cause you to boost that low, I run pretty rich, and I still hit 8psi with no trouble, on a whim. Where did you plug your boost gauge into? Which vacuum line?
The original small injector vs your new 750cc one is a huge difference, I would be very cautious of swapping them when using a higher boost pulley.....
But stage 4 is supposed to run rich, the way it's designed.

What other modifications do you have? Any other bolt on mods?

 

Nothing at all in the way of other mods (not even exhaust). I fully admit I'm pretty illiterate when it comes to cars, but I also can not figure out why running rich would have anything to do with how much boost the SC/pulley is making? Don't know the exact temps when the dyno was done, but I do remember the day that that this was done and it was an overcast winter day here in Colorado, so I'm guessing the outdoor temps were in the 40's or maybe low 50's? I have also heard that altitude an be a factor in terms of losing boost (I live in Denver), but I would still have expected to be at or above 7 lbs of boost on a 9 lb pulley? Don't have any idea where they plugged the boost guages as I wasn't around for the dyno. Maybe I can find this out from the shop later today.

 

Try doing a search, there is another member on this board who is from the denver are who was also down on boost. It has to do with your elevation. If you've upgraded to stage 2 to 4 and you are running more rich than before, yet your boost levels are the same you will probably loose horsepower like you are now. Check to see if your belts are tight and there is no slipping as well.
You probably need a smaller pulley to compensate.

 

Let us know how this turns out. You should still make more boost unless there is a problem. The pulley is turning the blower faster now so there should be more boost...
If you go up in altitude then you will make less boost, this is because the air is less dense. I live in Phoenix (~1,200ft) and go to Prescott (~5,300ft) and loose a good 2-3lbs. The cold air helps get some of it back.

 

Just got the Z back from the shop with a replacement fuel pump, as the new fuel pump that was installed with the Stage 4 upgrade went out on me after only having it about a month. The good news is that boost is now hitting ~10to 11 lbs, so possibly the bad fuel pump had something to do with the prior loss of boost? Need to get back out to the dyno to see if there has been any real change in the #'s.

 

Wow, you are making 10-11psi with Stage 4. Stillen told me it was only ~9. I didn't think a M62 blower could even make that much boost on our engine. Interesting...

 

yes,,yes,,yes,,,keep us posted with your dyno result

 

Just want to be clear that the 10-11 psi reading is coming from my newly installed boost guage. I have no idea how accurate these things are?

 

I would bet it is running a little high. I went back and checked my emails from Stillen and they told me it should be between 8.5 and 9.5psi with Stage 4. But I may be wrong...
Either way we are anxious to see how this turns out. So far the others that have posted results from Stage 4 have been very happy.