I just had Specialty Z install my 2.85" supercharger pulley. My old numbers with the 9lb pulley were 541whp 440 torque @ 10 psi. My new numbers with the 2.85 pulley addition are 586whp 486 torque @ 12.86 psi.
https://www.instagram.com/p/BkMC8SyF...=1v0kruqzp88uj

Wow is that just with Si impeller or did you change the jackshaft as well?

This is awesome. Nearing 600whp and 500wtq on the upgraded kit!!

2 years ago if someone told you they made that power out of a centri blower on the 370z you would have been laughed at and ridiculed as being a liar.

Winning! :happydance:

That car must be an animal

Jackshaft is stock. If I was strictly running e85 I would have had the 3.47 jackshaft installed but I'm on flex fuel (91 octane). Seb had to dial back the timing on 91 as it is on 12.86 boost.

I love the way it makes power. The extra 45ft.lbs. made the difference.
If you look at the dyno sheet, the power drops completely off at about 6900rpm. I asked Seb about that and he said the throttle is staying open to redline but boost is dropping off. He thinks the air filter is restricting the air flow to the sc. Beyond installing the turbo guard screen is there anything that can be done to get more air flow? I'm assuming the stock stillen boot and filter more restrictive than the filter that's on it?

I would spray some CRC dressing on the serp belt and data log the boost for a few street pulls. Then spray the SC belt and data log. That way you can determine where the slip comes into affect. I dont think its the filter as there is no reason it would just choke out and stop breathing completely like in the chart. It would be gradual and hold more of a straight line than a plunge.

Seb didn't think it was belt slip but like he said, he's on a learning curve with superchargers. I have the tbatt upgrade, do you think I could still be getting belt slip on the serpentine side? I guess most likely it's would be on the sc side. I had the same issue on my first tune with him too, prior to installing the 2.85 pulley. I'll talk to Seb about doing some data log runs with the belt dressing on each side. Thanks for the insight.

I've put belt dressing on both sides of both new belts and I have the TBatt pulley and the Si impeller and the 9lb pulley. I only make 8.5spsi @ 7k RPM on the street (3rd gear pulls)... Seb made almost 10psi on the stock 8lb pulley on someone else's car on a dyno (generally done in 5th gear).

I don't say that to knock anybody or anything, but to give you a data point if your street data looks different from your dyno data.

I haven't been able to get on a dyno yet to see pressure there since I went to the 9lb pulley.

The thing I have yet to do is use a thermal imager on the pulleys to see if any of them are heating up more than the others because of the frictional heat from belt slip (if that is the issue).

If you have any questions with what I've done to ensure that the issue is not with the engine, I'll be happy to talk to you about it. I can also trade logs with you if you'd like just for comparison to see if we're seeing proportional and similar performance.

Out of curiosity, if you don't mind, do you have the 928 bearings?

I called Vortech and the tech guy said most likely belt slippage and if I have slippage there should be belt dust and suggests high traction pulleys.

I checked and I have a lot of belt dust below/around the jackshaft pulley in the sc side so I'm definitely getting belt slippage. There is no belt dust around the sc pulley but the 2.85 I bought is a high traction. No belt dust anywhere on the serpentine side. I went ahead and ordered the high traction jackshaft pulley. Wondering if I should go ahead and change the sc belt also?

I don't have the 928 bearings and I know the bearings could be living on borrowed time.

Also, all of my logs were done on the dyno in SZ shop. I haven't done any data logging on the street. I made a little over 10psi with Si sc and 9lb pulley on the dyno.

This is all good info. Is anyone here running more than 1 breather filter on their PCV/crankcase vent hose? We ran into issues after tuning closed loop then going to open loop so I had to take it apart and look. Found that my 5/8 hose leading to crankcase vent was kinked trying to make the bend, so I put in a 3/4” brass elbow. Also cleaned and calibrated my wideband O2 (not yet wired to ecu) and downstreamo2 but don’t think that’s causing the issue.
Seb sent me this
“Since you have breather filters on the larger 5\8 VC ports I suggest you put the PCVs on breather filters as well. One thing that occurs is since you have breather filters on the larger ports you've essentially created a vac leak with the intake manifold going to the PCVs.“
Any idea where he’s thinking? The only place i can think is putting another T and a filter right at the PCV valve.

Here's how Seb did mine. Pic is drivers side. Passenger side has hose running from pcv to rear of engine compartment and filter installed on end of hose. Couldn't get pic of that.

Thanks that’s really helpful I think I get what you’re saying. So look at the pic of my breather filter and you can see that hose just next to it on the upper left with the blue octagon, he deleted that hose and just put a filter there? And my other pic there is a T joint (where that same hose splits off to the blue octagon port), instead of that T joint he just capped that part of the hose with filter also?
Thanks for the help a big reason i wanted to do this was to learn my engine bay, and imma learn today!

First pic is correct. Second pic, he deleted the tee completely and ran a hose off the pcv valve to the rear of the engine bay and installed a filter on the end of the hose.

And when I was looking at mine I noticed the passenger side has a kink in it right after it exits the pcv valve.

So with the a2a kit, I understand that the PCV is removed. This means the combustion vapor (water/fuel) other stuff will stay in the engine and cause more sludge/deposits.
The PCV system ventilates the crankcase.

Could this be a possible negative effect in the long run for the engine, or am I understanding something wrong?

Anyone can shed some light on this?

No, its vented to atmosphere