Topgunz full supercharger kits!!

redondoaveb · 07-12-2018, 02:59 PM

Quote:

Originally Posted by G3RSTY7

What size 8 rib pulley do these come with? And I assume we go smaller on the serpentine supercharger side rather than the 8 rib for higher boost due to belt tension issues? I was looking at 928 and they sell these sur-grip pulleys. Anyone running them and think they're any good? https://928motorsports.com/parts/8ribpulley.php The tbatt kit addresses slippage on the serpentine side but wasn't sure if slippage is an issue on the input side since my issue was not due to belt slippage in particular. And this kit already has the impeller upgrade, correct? Or is it just upgraded Si bell housing?

I can answer a couple of your questions. I've got bad belt slippage on the jackshaft pulley, sc side and I do have a sur grip pulley to put on it when my sc comes back from 928. My sc pulley is a high traction from vortech and I had no belt slippage on that one. The 928 pulley is really gritty, I can't imagine I'll have any slippage with it.

Topgunz's kit comes with the v3 Si supercharger, it has the Si impeller which is an upgrade from the Sci.

G3RSTY7 · 07-12-2018, 03:27 PM

Quote:

Originally Posted by redondoaveb

I can answer a couple of your questions. I've got bad belt slippage on the jackshaft pulley, sc side and I do have a sur grip pulley to put on it when my sc comes back from 928. My sc pulley is a high traction from vortech and I had no belt slippage on that one. The 928 pulley is really gritty, I can't imagine I'll have any slippage with it.

Topgunz's kit comes with the v3 Si supercharger, it has the Si impeller which is an upgrade from the Sci.

"I've got bad balt slippage"--says the guy making 12 and a half PSI and nearly 600whp?

Downsides I've heard about the sur-grip is belt dust getting on intake filter, and replacing belts more. I think for the time being I'll go with standard until I decide I have bad slippage as well. Will be excited to see your new setup and what you do with the intake.

redondoaveb · 07-12-2018, 04:07 PM

Quote:

Originally Posted by G3RSTY7

"I've got bad balt slippage"--says the guy making 12 and a half PSI and nearly 600whp?

Downsides I've heard about the sur-grip is belt dust getting on intake filter, and replacing belts more. I think for the time being I'll go with standard until I decide I have bad slippage as well. Will be excited to see your new setup and what you do with the intake.

But if I wasn't getting belt slippage and boost wasn't dropping off completely at 6900rpm, maybe I could have hit 600.

My belt is wearing pretty quickly as is with the belt slippage. We'll see how it holds up with the sur-grip.

Hopefully I'll have some updates on the other things we're working on in the next couple of weeks.

G3RSTY7 · 07-12-2018, 04:27 PM

Quote:

Originally Posted by redondoaveb

But if I wasn't getting belt slippage and boost wasn't dropping off completely at 6900rpm, maybe I could have hit 600.

My belt is wearing pretty quickly as is with the belt slippage. We'll see how it holds up with the sur-grip.

Hopefully I'll have some updates on the other things we're working on in the next couple of weeks.

Well you have me convinced that I need that now too. Better to have the car tuned with it on and hopefully not slipping at 6900RPM than decide later on I need it. Your numbers/figures still blow my mind. And you just have the 9lb pulley? Stock topgunz crank pulley and input pulley? My final test for this car would be an extended road trip because to pass the final test it needs to prove itself to be moderately reliable. A trip from Denver-Utah-SoCal and back up (maybe through AZ) would fit the bill and we should cruise GMR someday

redondoaveb · 07-12-2018, 05:39 PM

Quote:

Originally Posted by G3RSTY7

Well you have me convinced that I need that now too. Better to have the car tuned with it on and hopefully not slipping at 6900RPM than decide later on I need it. Your numbers/figures still blow my mind. And you just have the 9lb pulley? Stock topgunz crank pulley and input pulley? My final test for this car would be an extended road trip because to pass the final test it needs to prove itself to be moderately reliable. A trip from Denver-Utah-SoCal and back up (maybe through AZ) would fit the bill and we should cruise GMR someday

For the little bit of money you spend, you have peace of mind. I have the 9lb pulley and the 2.85 sc pulley. There is no reason for the car to not be reliable, it drives like a stock car. It drives just as good slow as it does fast. As long as you've got a good tune, I don't see why there sould be any concern.

I did Baldy rd. on my bicycle and when I got to the village I cut over to grr and then down to gmr. I saw two cars total on grr and gmr. It was during the week. Would have been a blast in my car. Do you know gmr well?

G3RSTY7 · 07-13-2018, 08:09 PM

Quote:

Originally Posted by redondoaveb

For the little bit of money you spend, you have peace of mind. I have the 9lb pulley and the 2.85 sc pulley. There is no reason for the car to not be reliable, it drives like a stock car. It drives just as good slow as it does fast. As long as you've got a good tune, I don't see why there sould be any concern.

I did Baldy rd. on my bicycle and when I got to the village I cut over to grr and then down to gmr. I saw two cars total on grr and gmr. It was during the week. Would have been a blast in my car. Do you know gmr well?

What size is on the input shaft 8rib pulley on this kit? I measured it looks close to 3.25” but 928 sells both that and a 3.15” so well within margin of error of my measurement, and how small can we go? Are you calling the 8rib pulley the SC pulley and going for 2.85”?I imagine the limiting factor when you get too small of a pulley there you can no longer achieve proper tension with the tensioner. And since people usually go to a smaller SC pulley with a larger idler instead, does that mean this stock pulley is already nearly at tension limit being as small as can without issue?

GMR was our 7am stomping ground, we were the longboarders there early morning before it got too busy/cops. Ventured over to baldy for a bit just to even attempt it and that’s about all i could do such a steep road into hairpins

redondoaveb · 07-13-2018, 08:34 PM

Quote:

Originally Posted by G3RSTY7

What size is on the input shaft 8rib pulley on this kit? I measured it looks close to 3.25” but 928 sells both that and a 3.15” so well within margin of error of my measurement, and how small can we go? Are you calling the 8rib pulley the SC pulley and going for 2.85”?I imagine the limiting factor when you get too small of a pulley there you can no longer achieve proper tension with the tensioner. And since people usually go to a smaller SC pulley with smaller idler instead, does that mean this stock pulley is already nearly at tension limit being as small as can without issue?

GMR was our 7am stomping ground, we were the longboarders there early morning before it got too busy/cops. Ventured over to baldy for a bit just to even attempt it and that’s about all i could do such a steep road into hairpins

Input shaft? Are you talking about the jackshaft on the sc side? If so, stock size is a 3.20. I got the 3.25 from 928 . The problem with changing the jackshaft pulley is that the stock one isn't a vortech style and has a different offset so if you put a vortech style (vortech or 928) then you need to add a spacer to the sc shaft in order to bring that pulley out far enough for the jackshaft and sc pulleys to line up. 928 makes a slotted spacer just for that purpose. The actual pulley on the sc I changed to a 2.85. I also had to change the idler pulley to a 3.00 in order to take up the belt slack.

That must have been a rush longboarding those roads. I couldn't even imagine doing Baldy Rd. though. It was a b!tch climbing it on my bike, there are some steep sections.

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