I thought I remembered someone mentioning the FI tow bar will work with this intercooler, but I can't find it again. Can anyone confirm this will fit?

http://i.imgur.com/6mrZLjot.jpg

You want to know if it will work with Topgunz's intercooler? If so, yes it does.

Wasn't there an issue with the tow hook location on the G37?

I may be the first person in history to ask this question, but: how would I go about lowering the boost? I imagine swapping out one of the pulleys, which one though and where would I get one? The car is currently making 12.7psi of boost and Sebastian thinks more timing and less boost would be beneficial with the fuel I have available to me.

Hmmm... so the car only makes too much boost at or near redline, correct?

So he wants you to sacrifice boost and power in the other 90% of the rev range in order to increase it at the very end, where you probably will spend very little time?

I am just relaying the information I was told. I think it's pretty safe to say Sebastian with his knowledge and experience is probably the undisputed best tuner for this platform, I trust his advice. I am however thinking I might put the car on a dyno to see how much power it makes at the current boost/timing, then play with the pulleys and have the timing adjusted and get the car re-dynoed, it would make for a nice comparison and I'll be able to know for sure which is ideal. But yes, you're right, it would ultimately depend on what I want more, more peak power or more power everywhere else. I haven't made that decision yet and I think comparing two dynos would be the best way to make that choice. If I'm only losing a little bit of power down low but making a decent amount more at the top end, then yeah that would probably be what I'd go with.

What are you mods? How are you making almost 13psi with my kit? The only thing I can think of is that you have a restriction in your exhaust somewhere therefore creating too much backpressure which is exactly how boost is measured.

Do you have stock cats? Free flow exhaust?

I'm interested in your supporting mods, too. Curious about the reason of lowering boost. I've been running 13psi on stock block of filter on and pump 93 gas for up to 6500 miles with no issues. What fuel are you using? What exhaust system (cat/catless/header/test pipes/cbe/pipe diameters) are you using? What fuel system are you using? What ignition timing is with your car? Increasing volumetric efficiency by means of better intake and exhaust can benefit power without the need of too much boost and is always good to do so, but it's better to let us know your mods first so that one could comprehend the reason. Lowering boost can be achieved by either a larger jackshaft pulley (serpentine side) or a larger supercharger pulley (supercharger side). :hello:

Honestly though. The BEST way to do this is to just weld a wastegate into your L pipe. You can then set the exact amount of boost you want to run. If you have a 10 psi spring in there you would be limited to 10 psi. The reason this is better than swapping a pulley is that you get all the down low and mid range benefits of hitting boost faster but will limit the top end so you dont overboost.

There is a guy on this forum (redondoaveb) that is doing that except he has a boost controller and will run around on 9psi or so but then switches to his race tune and hits 14psi. Its pretty cool.

It's a full motordyne exhaust, including ART pipes, so no catalytic converters. I know it's not the absolute best free flowing exhaust but it should flow very well, significantly better than OEM. The "muffler" for it is just an x-pipe. I was surprised at that much boost too, considering everything I've seen people are making 10-11psi on the same setup. I have no idea why it is making so much boost, really don't.

Do you know the pipe diameters of your muffler? Any pics of your exhaust? I'm assuming your boost readings are correct....

I believe it starts at 2.5" and gradually increases to 3" or something like that, it's literally the stock motordyne shockwave exhaust for the 370z (https://motordyneengineering.com/pro...ockwave-e370z/)

I'm second guessing the boost readings my self, I am using the omni 4 bar map sensor. I just looked at the peak number for Manifold Absolute Pressure (and confirmed it with Sebastian as well). But, actually going back in the logs and seeing when it hit that number, it hit .80 bar at around 6500 rpm, peaked at .88 bar at 7,100rpm, then actually dropped a bit to around .78 bar by redline (7,700 rpm).

I'm still new at forced induction, but correct me if I'm wrong but I don't think a centrifugal supercharger is supposed to hit peak boost before redline then drop off, I suppose that would potentially indicate a boost leak, however it's already making more boost than it should.

Here's the MAP sensor log for the pull: https://i.imgur.com/lrg1T1d.png

Could you please check if there is any dust around the bracket? What's your combination of the pulley and belt? Are you overspinning your blower? I'm guessing your suffering from certain degree of belt slip in addition to the boost leak (if any).

I don't know the exact details, what I got is what went on, there was no extra parts to get mixed up with, so Aaron would know better about what's on it. In fact, the three pulleys and belt on the back of the supercharger already came pre-assembled, I never even had to touch any of that.

I measured a couple of the pulleys that I could, the others I can't do while they're still on the car, at least not with a tape measure. Also sorry for not knowing the exact names of the pulleys, I'm still learning lol.

Serpentine side:

Top left (the one next to the main pulley that spins the supercharger belt): 2.875"
Top right (the one that spins the supercharger belt): 2.875"

Supercharger side:

Supercharger pulley (the one on the supercharge its self): 3.25"

The rest I either need to take off the car or maybe a caliper would do it