Belt slip much?

ART_Auto · 07-12-2014, 12:41 PM

We installed the AEM boost gauge today and while testing we noticed that up top the boost was dropping from 7/8/9 psi down to 2 or 4 psi randomly. This got me thinking belt slip and I found this.

Any ideas what might cause it? We are running the Stillen 9lb pullley and a 7PK2635 belt, Gate Micro-V Horizon. I have a feeling its a combination of the smaller pulley not being shot blasted for grip and the Gates Horizon belt.

Would a Micro-V AT or Micro-V XF belt be better for grip?

Does anyone have the part number for that 7 rib idler pulley? We have noticed that one has play in it.

Pro4Jackster · 07-12-2014, 04:46 PM

I was running the entire serpantine setup that comes with the Stillen kit and it did not slip until about 15 psi. I realize that's not much help, but the belt and pulleys Stillen provides should not slip at 9 psi if setup properly.

ART_Auto · 07-12-2014, 05:47 PM

Im thinking it could be possible that its the difference between the Gates Micro-V Horizon (which is currently on it and slipping) and the supplied Gates Micro-V AT.

If I could find a Micro-V AT in a 2635 length I would be onto a winner. I just felt that the supplied belt was too long with the 9lb pulley which we installed after the initial install.

Super Werty · 07-12-2014, 06:24 PM

hairspray

DOOMMONKEY777 · 08-03-2014, 02:03 AM

LOL, put a chain on it then. Hella loud but no slip guarantee.

1slow370 · 08-04-2014, 03:59 AM

the ultimate in belt slip elimination have the pulleys carbide blasted Drive Roller with Traction & Release Properties for Specialty Printing Device - Saint Paul, Minnesota

Nissan370 · 08-04-2014, 05:41 AM

when i had my mustang i went to a 10-rib and my slipping problem was completely cured

Pro4Jackster · 08-04-2014, 07:11 AM

I still think there is another problem. Nobody else has belt slip at 8-9 psi.

Nissan370 · 08-04-2014, 07:50 AM

aligment if your getting slippage at low boost or could be something as simple as the bracket flexing

ANMVQ · 08-04-2014, 08:03 AM

Something I brought up in their other thread, I had zero slip at 12 psi.

Pro4Jackster · 08-04-2014, 01:30 PM

I had some bracket flexing at 13.5 psi, but it built psi/hp (no slip) all the way to redline. There was belt slip from 6700 rpms to redline after I upgraded to the SI impeller, but the psi held steady at 15 psi from 6700 to 7700 rpms. JTran built me a bracket to stop the flexing, but I never got the chance to try it out.

07-12-2014, 12:41 PM	#1 (permalink)
ART_Auto Base Member Join Date: Mar 2014 Location: Glasgow, UK Posts: 43 Drives: 370z Rep Power: 11	Belt slip much? We installed the AEM boost gauge today and while testing we noticed that up top the boost was dropping from 7/8/9 psi down to 2 or 4 psi randomly. This got me thinking belt slip and I found this. Any ideas what might cause it? We are running the Stillen 9lb pullley and a 7PK2635 belt, Gate Micro-V Horizon. I have a feeling its a combination of the smaller pulley not being shot blasted for grip and the Gates Horizon belt. Would a Micro-V AT or Micro-V XF belt be better for grip? Does anyone have the part number for that 7 rib idler pulley? We have noticed that one has play in it. Last edited by ART_Auto; 07-12-2014 at 12:43 PM.

07-12-2014, 04:46 PM	#2 (permalink)
Pro4Jackster Base Member Join Date: Oct 2011 Location: NW Houston Posts: 130 Drives: '08 350Z Rep Power: 13	I was running the entire serpantine setup that comes with the Stillen kit and it did not slip until about 15 psi. I realize that's not much help, but the belt and pulleys Stillen provides should not slip at 9 psi if setup properly. __________________ Jtranbuilt '08 Z [Jtran PT7075 Single - Fujitsubo - Transgo - Wilwood - TE37SL - BC Racing]

07-12-2014, 06:24 PM	#4 (permalink)
Super Werty Track Member Join Date: Jul 2013 Location: AZ Posts: 668 Drives: '13 Sport Rep Power: 12	hairspray __________________ The Build

08-03-2014, 02:03 AM	#5 (permalink)
DOOMMONKEY777 A True Z Fanatic Join Date: Sep 2010 Location: Crooklyn Posts: 1,008 Drives: 370Z 6psd-sport-pkg Rep Power: 20	LOL, put a chain on it then. Hella loud but no slip guarantee. __________________ Kids don't do Drugs, Drugs are bad, so let the professional druggies do Drugs for you. 537whp/496lb/tq@8-9PSI 93 octane

08-04-2014, 03:59 AM	#6 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7250	the ultimate in belt slip elimination have the pulleys carbide blasted Drive Roller with Traction & Release Properties for Specialty Printing Device - Saint Paul, Minnesota __________________ ANSWER PRICE LIST Answers - - - - - - - - - - - - - - - - $0.75 Answers (requiring thought) - - - - $1.25 Answers (correct) - - - - - - - - - - $12.50

07-12-2014, 05:47 PM	#3 (permalink)
ART_Auto Base Member Join Date: Mar 2014 Location: Glasgow, UK Posts: 43 Drives: 370z Rep Power: 11	Im thinking it could be possible that its the difference between the Gates Micro-V Horizon (which is currently on it and slipping) and the supplied Gates Micro-V AT. If I could find a Micro-V AT in a 2635 length I would be onto a winner. I just felt that the supplied belt was too long with the 9lb pulley which we installed after the initial install.

08-04-2014, 05:41 AM	#7 (permalink)
Nissan370 Enthusiast Member Join Date: Feb 2011 Location: Baltimore Posts: 431 Drives: 2009 ST BLK 370Z Rep Power: 14	when i had my mustang i went to a 10-rib and my slipping problem was completely cured __________________ 370z vsr motorsports single turbo/built motor 9.1cr 525rwhp/450rwtq @ 10.5psi (stock maf maxed out)

08-04-2014, 07:11 AM	#8 (permalink)
Pro4Jackster Base Member Join Date: Oct 2011 Location: NW Houston Posts: 130 Drives: '08 350Z Rep Power: 13	I still think there is another problem. Nobody else has belt slip at 8-9 psi. __________________ Jtranbuilt '08 Z [Jtran PT7075 Single - Fujitsubo - Transgo - Wilwood - TE37SL - BC Racing]

08-04-2014, 07:50 AM	#9 (permalink)
Nissan370 Enthusiast Member Join Date: Feb 2011 Location: Baltimore Posts: 431 Drives: 2009 ST BLK 370Z Rep Power: 14	aligment if your getting slippage at low boost or could be something as simple as the bracket flexing ANMVQ likes this. __________________ 370z vsr motorsports single turbo/built motor 9.1cr 525rwhp/450rwtq @ 10.5psi (stock maf maxed out)

08-04-2014, 08:03 AM	#10 (permalink)
ANMVQ A True Z Fanatic Join Date: Mar 2011 Location: Framingham MA Posts: 2,732 Drives: 2014 Q50 AWD Rep Power: 19	Something I brought up in their other thread, I had zero slip at 12 psi. __________________ 14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

08-04-2014, 01:30 PM	#11 (permalink)
Pro4Jackster Base Member Join Date: Oct 2011 Location: NW Houston Posts: 130 Drives: '08 350Z Rep Power: 13	I had some bracket flexing at 13.5 psi, but it built psi/hp (no slip) all the way to redline. There was belt slip from 6700 rpms to redline after I upgraded to the SI impeller, but the psi held steady at 15 psi from 6700 to 7700 rpms. JTran built me a bracket to stop the flexing, but I never got the chance to try it out. __________________ Jtranbuilt '08 Z [Jtran PT7075 Single - Fujitsubo - Transgo - Wilwood - TE37SL - BC Racing] Last edited by Pro4Jackster; 08-05-2014 at 09:06 AM. Reason: Ocd

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