Topgunz - air to air upgrade

TopgunZ · 06-20-2018, 09:42 AM

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.

redondoaveb · 06-20-2018, 10:17 AM

Quote:

Originally Posted by TopgunZ

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.

turtle64b · 06-20-2018, 12:48 PM

Quote:

Originally Posted by redondoaveb

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?

redondoaveb · 06-20-2018, 01:29 PM

Quote:

Originally Posted by turtle64b

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.

turtle64b · 06-23-2018, 05:39 PM

Quote:

Originally Posted by redondoaveb

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?

Can you guys give the part numbers or link for the pulleys that you picked up from Vortech? Or let me know how you communicated your needs to Vortech. I want to change up my pulleys now for the high traction design given my lower-than-expected boost issue to see if that might help. The CRC dressing got me .3 more psi haha

I saw this one, Part# 2A038, on the Vortech website. It is the same part number for the "normal" 8-rib supercharger drive pulley and the "high-traction" pulleys...

The high traction category doesn't have a 3.4 option... Otherwise, I'd go back to the 8lb serp side and do the 3.4-3.0 jackshaft-SC on the SC side like Topz

I was thinking of keeping the 9lb serp side and ordering two 3.15 (is this what y'all are calling the 3.2?) high traction to replace the SC side.

And to answer the question, you might as well replace the belt, knowing that you've worn the belt a bit and having everything apart.

redondoaveb · 06-23-2018, 05:52 PM

Quote:

Originally Posted by turtle64b

Can you guys give the part numbers or link for the pulleys that you picked up from Vortech? Or let me know how you communicated your needs to Vortech. I want to change up my pulleys now for the high traction design given my lower-than-expected boost issue to see if that might help. The CRC dressing got me .3 more psi haha

I saw this one, Part# 2A038, on the Vortech website. It is the same part number for the "normal" 8-rib supercharger drive pulley and the "high-traction" pulleys...

The high traction category doesn't have a 3.4 option... Otherwise, I'd go back to the 8lb serp side and do the 3.4-3.0 jackshaft-SC on the SC side like Topz

I was thinking of keeping the 9lb serp side and ordering two 3.15 (is this what y'all are calling the 3.2?) high traction to replace the SC side.

And to answer the question, you might as well replace the belt, knowing that you've worn the belt a bit and having everything apart.

I'm replacing my jackshaft pulley with the 2A038 high traction 3.15 as they don't make a 3.20. I don't know what manufacturer the stock jackshaft pulley is but it's not a Vortech. Also, if you change your jackshaft pulley to the Vortech, you need to add a spacer to the sc shaft as the Vortech pulley is a different offset than the stock 3.20. 928 Motorsports makes a high traction 3.25 that looks pretty interesting but it's $180.00.

I already have a new belt ordered.

turtle64b · 06-23-2018, 06:29 PM

Quote:

Originally Posted by redondoaveb

I'm replacing my jackshaft pulley with the 2A038 high traction 3.15 as they don't make a 3.20. I don't know what manufacturer the stock jackshaft pulley is but it's not a Vortech. Also, if you change your jackshaft pulley to the Vortech, you need to add a spacer to the sc shaft as the Vortech pulley is a different offset than the stock 3.20. 928 Motorsports makes a high traction 3.25 that looks pretty interesting but it's $180.00.

I already have a new belt ordered.

If I get a pair and replace both the jackshaft and the SC pulleys with the 3.15 (or smaller) High Traction from Vortech, won't the offsets match?

06-20-2018, 09:42 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: 6834	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. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

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