Topgunz full supercharger kits!!

"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).

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.

TopgunZ · 10-08-2019, 08:40 AM

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.

DrBacon · 10-08-2019, 05:54 PM

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

"Z"en · 10-08-2019, 07:35 PM

Quote:

Originally Posted by DrBacon

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

These sound about right. Try to see If the one next to the supercharger has the same size as that of the one on the supercharger its self. I'm assuming your lower idler on the supercharger side is stock 2.5". Let us know the part numbers of your belts on both sides.

redondoaveb · 10-08-2019, 08:16 PM

Quote:

Originally Posted by "Z"en

These sound about right. Try to see If the one next to the supercharger has the same size as that of the one on the supercharger its self. I'm assuming your lower idler on the supercharger side is stock 2.5". Let us know the part numbers of your belts on both sides.

Are you talking about the jackshaft pulley? If so, I can guarantee it hasn't been changed because if it had whoever changed it would have had to add a spacer to the sc pulley to compensate for the different offset of the new Vortech jackshaft pulley. I'll bet it's the stock 3.2.

DrBacon · 10-08-2019, 08:41 PM

Quote:

Originally Posted by redondoaveb

Are you talking about the jackshaft pulley? If so, I can guarantee it hasn't been changed because if it had whoever changed it would have had to add a spacer to the sc pulley to compensate for the different offset of the new Vortech jackshaft pulley. I'll bet it's the stock 3.2.

Really hard to tell with it still on the car but it appears to be the same size as the one on the supercharger, definitely larger than 3". I really doubt there's a restriction in my exhaust, but who knows anymore. If I'm making almost 13psi at 7,100 rpm before it starts to fall off (because of either boost leak or belt slip, or both...) I can't even imagine what it would be trying to do if it hit redline at 7,700rpm. What the hell lmao

redondoaveb · 10-08-2019, 08:55 PM

Quote:

Originally Posted by DrBacon

Really hard to tell with it still on the car but it appears to be the same size as the one on the supercharger, definitely larger than 3". I really doubt there's a restriction in my exhaust, but who knows anymore. If I'm making almost 13psi at 7,100 rpm before it starts to fall off (because of either boost leak or belt slip, or both...) I can't even imagine what it would be trying to do if it hit redline at 7,700rpm. What the hell lmao

I'm sure it a 3.2, same as the sc. If it had been changed you'd see a spacer on the sc shaft in order to space the sc pulley out to match the offset of the new jackshaft pulley.

After I got my belt slip stopped, my car hit peak boost at 7400rpm and max power at 7300rpm.

"Z"en · 10-08-2019, 10:54 PM

Quote:

Originally Posted by DrBacon

Really hard to tell with it still on the car but it appears to be the same size as the one on the supercharger, definitely larger than 3". I really doubt there's a restriction in my exhaust, but who knows anymore. If I'm making almost 13psi at 7,100 rpm before it starts to fall off (because of either boost leak or belt slip, or both...) I can't even imagine what it would be trying to do if it hit redline at 7,700rpm. What the hell lmao

If your using the Art pipes paired with the E370 (but there are two versions of it, not sure which one your running with but I guess it is the one they designed for forced induction according to your description to the pipe diameters), I don't think there isn't enough free flowing. I'm also running Art pipes but using a true-dual 3" catback exhaust. What's your average exhaust gas temperature under WOT?

"Z"en · 10-08-2019, 10:47 PM

Quote:

Originally Posted by redondoaveb

Are you talking about the jackshaft pulley? If so, I can guarantee it hasn't been changed because if it had whoever changed it would have had to add a spacer to the sc pulley to compensate for the different offset of the new Vortech jackshaft pulley. I'll bet it's the stock 3.2.

Yeah I do think so. Always good to check more details. I'm thinking if he will see some belt dust around the bracket. If not, then he has to check if there is any leak.

Senna-F1 · 10-09-2019, 11:36 PM

We’re using whatever came with the kit, nothing special, so not sure if it’s Stillen extensions or not. We have not started the car yet as it has no tune uploaded yet. I’ll pass along the info. Thanks.

Sent from my iPhone using Tapatalk

DrBacon · 10-13-2019, 10:20 PM

I tightened it about one full turn of the bolt, I marked it before starting. The belt doesn't "seem" any tighter but I didn't want to overtighten it. I did one pull and the boost peaked at 7,000 rpms (at 12.2psi) and stayed pretty constant all the way to 7,700 this time, not dropping off anymore. I'll do a few more pulls some time later to confirm but I think it's fine for now. New clutch goes in on thursday, then I'll do the break in miles and get it on a dyno fairly soon after.

10-08-2019, 08:40 AM	#6 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6835	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. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

10-09-2019, 11:36 PM	#14 (permalink)
Senna-F1 Enthusiast Member Join Date: Jun 2016 Location: Cary, NC Age: 54 Posts: 425 Drives: 370SC,EliseSC,MR2T Rep Power: 51	We’re using whatever came with the kit, nothing special, so not sure if it’s Stillen extensions or not. We have not started the car yet as it has no tune uploaded yet. I’ll pass along the info. Thanks. Sent from my iPhone using Tapatalk __________________ 618 WHP.452 WTQ.4" Python Intake.15 psi.e50.Topgunz SC.SOHO Tune.S1SE.STG 4 Clutch.Motordyne LTH/Test Pipes/Exhaust.485 Pump.1050x

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10-08-2019, 05:54 PM	#7 (permalink)
DrBacon Enthusiast Member Join Date: Nov 2016 Location: Washington Posts: 286 Drives: 2014 Nismo Rep Power: 27365	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

10-13-2019, 10:20 PM	#15 (permalink)
DrBacon Enthusiast Member Join Date: Nov 2016 Location: Washington Posts: 286 Drives: 2014 Nismo Rep Power: 27365	I tightened it about one full turn of the bolt, I marked it before starting. The belt doesn't "seem" any tighter but I didn't want to overtighten it. I did one pull and the boost peaked at 7,000 rpms (at 12.2psi) and stayed pretty constant all the way to 7,700 this time, not dropping off anymore. I'll do a few more pulls some time later to confirm but I think it's fine for now. New clutch goes in on thursday, then I'll do the break in miles and get it on a dyno fairly soon after.