Topgunz full supercharger kits!!

TopgunZ · 10-08-2019, 07:36 AM

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?

DrBacon · 10-08-2019, 01:59 PM

Quote:

Originally Posted by TopgunZ

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?

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.

"Z"en · 10-08-2019, 02:04 PM

Quote:

Originally Posted by DrBacon

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....

DrBacon · 10-08-2019, 02:15 PM

Quote:

Originally Posted by "Z"en

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:

"Z"en · 10-08-2019, 02:56 PM

Quote:

Originally Posted by DrBacon

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:

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).

DrBacon · 10-08-2019, 03:05 PM

Quote:

Originally Posted by "Z"en

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.

Senna-F1 · 10-15-2019, 12:23 AM

Quote:

Originally Posted by TopgunZ

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?

]

Well, I'm making 12.3 psi boost. Stock pulley, Motordyne LTH, Helmholtz test pipes, Motordyne exhaust. Seems pretty high. Eugene says Im at 77% duty cycle on pump gas on my Walbro 480/1050cc combo which was supposed to already be an upgrade pump wise just to be safe. We need to check fuel pressure under boost. So, plenty of boost, but no room for E85 at this duty cycle.

DrBacon · 10-15-2019, 01:02 AM

Quote:

Originally Posted by Senna-F1

]

Well, I'm making 12.3 psi boost. Stock pulley, Motordyne LTH, Helmholtz test pipes, Motordyne exhaust. Seems pretty high. Eugene says Im at 77% duty cycle on pump gas on my Walbro 480/1050cc combo which was supposed to already be an upgrade pump wise just to be safe. We need to check fuel pressure under boost. So, plenty of boost, but no room for E85 at this duty cycle.

Welcome to my world, now you understand?

. Out of curiosity how consistent is your boost over different WOT pulls? I have about a 1psi variance, I've seen as "low" as 11.8 to 12psi and as high as 13psi, with no changes.

Senna-F1 · 10-15-2019, 02:07 PM

Quote:

Originally Posted by DrBacon

Welcome to my world, now you understand?

. Out of curiosity how consistent is your boost over different WOT pulls? I have about a 1psi variance, I've seen as "low" as 11.8 to 12psi and as high as 13psi, with no changes.

I didn't have any issues understanding. So my runs are consistent boost wise. Although I think my Innovate gauge might read a bit lower...maybe 10's? we just got it working so I need to check that. The issue with duty cycle was a kinked vacuum line which is why boost gauge wasn't working, and FPR wasn't raising pressure. But duty is still 70%.

What are folks setting idle fuel pressure to? 41-42? Or more like 52? CJM says 1050's are for cars making less than 700WHP. Im way below that. Going to take a video of the fuel pressure to see what it's doing.

"Z"en · 10-15-2019, 09:14 PM

Quote:

Originally Posted by Senna-F1

I didn't have any issues understanding. So my runs are consistent boost wise. Although I think my Innovate gauge might read a bit lower...maybe 10's? we just got it working so I need to check that. The issue with duty cycle was a kinked vacuum line which is why boost gauge wasn't working, and FPR wasn't raising pressure. But duty is still 70%.

What are folks setting idle fuel pressure to? 41-42? Or more like 52? CJM says 1050's are for cars making less than 700WHP. Im way below that. Going to take a video of the fuel pressure to see what it's doing.

Depends on whether your tuner uses the vacuum line or not. Most of the tuners like to set base pressure as 43-45 and to use the vacuum line. There are three kinds of pressure - regulator pressure (set with the adjuster screw), manifold pressure (for those of the vacuum line hooked up), and pressure at the injectors. Mine was set as 52 for the idle fuel pressure. With the fuel return, duty cycle, and recorded pressures under WOT, one can actually confirm if the fuel pump is capable of supporting the power under WOT, based on the fuel your using.

cgr406 · 11-02-2019, 07:21 PM

So recently my car has been feeling a bit sluggish and i noticed that my max boost readings were only about 4.5 lbs (down from about 7.7 right after system install). So I either was experiencing belt slip, had a boost leak or my filter was clogged. I really didn't want to remove the blower, so I cut the filter in half around it's circumference & pulled it out. Wow, super clogged, as you can see below (after only about 6 months of use). I then built a "turbo-guard" type of inlet screen out of 5/64" opening stainless (very strong) screen that I sourced from Summit. Now, i'm not sure how long I'm going to run w/ this setup b/c although it will certainly stop the large stuff from getting in, lots of smaller dirt will flow right through. But wow, what an improvement. I went for a quick test drive & was seeing between 9.5 & 10lbs of boost during 2nd gear pulls. Needless to say, the car feels waaay stronger.

cupcakez · 11-02-2019, 07:39 PM

Quote:

Originally Posted by cgr406

So recently my car has been feeling a bit sluggish and i noticed that my max boost readings were only about 4.5 lbs (down from about 7.7 right after system install). So I either was experiencing belt slip, had a boost leak or my filter was clogged. I really didn't want to remove the blower, so I cut the filter in half around it's circumference & pulled it out. Wow, super clogged, as you can see below (after only about 6 months of use). I then built a "turbo-guard" type of inlet screen out of 5/64" opening stainless (very strong) screen that I sourced from Summit. Now, i'm not sure how long I'm going to run w/ this setup b/c although it will certainly stop the large stuff from getting in, lots of smaller dirt will flow right through. But wow, what an improvement. I went for a quick test drive & was seeing between 9.5 & 10lbs of boost during 2nd gear pulls. Needless to say, the car feels waaay stronger.

I like how you just cut the K&N filter! Haha. That's something I'd probably do next time if I know I'm going to replace it with something else that does not require me to take out the blower.

What's your pulley setup?

I'm experiencing really low boost myself (7 PSI average) and that's with serpentine belt slip & a really clogged up K&N air filter + busted up at that to make things worse (it looks almost like a cup).

Without an air filter you should be running close to 11 - 13 PSI depending on what your pulley set up is.

If you're only pulling in 9.5 - 10psi then there is still something wrong with the boost you have (because I have similar problems, just may not be exact same as you).

10-08-2019, 07:36 AM	#1 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6835	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? __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM Last edited by TopgunZ; 10-08-2019 at 08:35 AM.

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