SC Impeller Upgrade?
 

Ok guys, I did a google search and couldn't seem to find all the answers I was looking for....

I'm considering the impeller upgrade on the Vortech blower from Stillen...Based on what I've read so far the options are

1). Upgraded impeller from 928 Motorsports in which you can order the Impeller (Counter Clockwise if I'm not mistaken) OR

2). The Vortech Ti or Si Upgrade....

Through my search I found that the Vortech impeller upgrade appears to be cheaper (I beleive AMNVQ quoted around sub $300) versus the 928 Impeller which will run about $600 with shipping. The 928 Motorsports option is pretty clear cut...but how can you order the Vortech upgrade...I've read so many different things...some people posted Vortech won't do it cuz of Stillen and another posted that he was able to get it through communications with both Stillen and Vortech.... I went to Vortech's site and it doesn't have any options about impeller upgrades there....I've also read that if you want to do the impeller upgrade you have to ship the blower out...Is this true for both the Vortech and 928 Motorsports upgrade?

I also wanted to know from those that have experience with these impellers as to which one is better performance wise? I know that the 928 Motorsports site advertises 10-15% more boost throughout the power band, but I couldn't find anything about how much boost/power the Si or Ti impeller upgrade would make....

Call Vortech. It's a V3, you can send it to them directly.

There is a page in their website about the upgraded impeller and data sheet but it's hard to find. I'll see if I can track down the link. Ask them about ceramic bearings while you're at it.

Just a heads up there is a third option: Supercharger Rebuilds » Vortech V1, V2, V3, V4, V5, V7, V9, V24, V28

Thanks Man....

That's a whole lot of options there....Awesome!

I had bookmarked that link on Vortech's page I was talking about and now just get a 404 on it so they must have changed it. Was a real good information sheet that had all the specs of each trim on one page for easy reference too. No idea why they would have got rid of it but they did.

You can get all the information from that supercharger rebuilds site but it's just not as well laid out. At least it's all there though.

Otherwise can call Vortech, their customer service is excellent. Unlike Stillen's

Yes, Vortech techs are awesome at customer service and answering technical questions.

I would send my unit to them if i were doing it as they are the manufacturers of this unit and know it better than anyone else. They also will most likely warranty their work.

I can confirm this to 100%!

I tried several setups (928 & Shaper from Gemany) :shakes head:

Send the blower to Vortech and upgrade it to Si.
Incl. new high-performance bearings.

It's easier and you'll have more ease of mind sending it over to Vortech. Your warranty will pretty much be gone if you go the alternative routes. From what I've read, the Si is actually better than 928's impeller and kicks in earlier.

It's a bit risky having the Ti conversion done as well because they need to bore the unit. If you really want it, you gotta buy the whole unit off the corvette sites, since Vortech specifically makes it for them.

Bookmarking this thread... awesome information here!

Adding to this thread since it is recent and in target. The volute doesn't need to be turned for the si impeller upgrade, correct? The opening is 3.33" and narrows to 3.02" at the impeller. I know some of them need the volute to be opened up but looking for confirmation that's not the case with this impeller upgrade.

Also, does anyone have any pics of the impellers. Either stock Vortech or even better the Si trim upgraded one? Want to do a direct comparison.

Thanks, appreciate it :tup:

Can't help ya with the comparrison pics bud, but I can tell you for certain that the volute does not need to be scrolled for the Si upgrade. The Sci is simply a trimmed down Si impeller so it is a simple swap with a spacer to have the correct gap. Hope this helps you somewhat :tiphat:

The only time the volute needs to be scrolled is for the Ti trim. You can find pics of the SCI, S, SI, and TI vortech and alternative impellers online easily. What are you looking at in terms of comparing them though?

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Whole dealing with rebuilding this thing I sent so pictures and video to the shop. The blower I bought second hand - supposedly almost brand new but that's another story - was told it was an Si trim with the upgraded impeller.

The blower ended up being fubar, hence my conversations with the rebuild shop in the first place.

But now it seems I got fvcked even more and it isn't an Si trim impeller at all

Found some decent images.

Here is a stock sci trim right from Stillen:
http://www.the370z.com/members/chase...7-img-3301.jpg

Here is a picture of mine I took right before packaging it up this morning:
http://www.the370z.com/members/chase...8-img-3302.jpg
This ain't Sesame Street, one of these things is exactly the fvcking same as the other :mad:

So not only was it beat to ****, broken, missing parts, packed like ****, damaged, it wasn't even what he told me it was.

That jives, thanks

Up for a road trip down to Louisiana? :icon17:

Directly from Vortech the V3 Sci trim
http://www.the370z.com/members/chase...-com-image.jpg
That definitely settles it :mad:

Here are some pictures of my supercharger after getting it back last week from 928 Motorsports. They did the Super Vortech upgrade. 72k rpm rated ceramic bearings, HSS steel bearings for the input drive shaft, seals, and impeller. I think the impeller looks pretty sweet. Hoping for some big boost out of it.

Nice!

If you don't mind sharing could you PM me what kind of $$ that set you back, and turnaround time? EDIT: found it https://928motorsports.com/parts/super_vortech.php

Here's my Ti trim for reference. The volute and impeller are HUGE.

https://uploads.tapatalk-cdn.com/201...ba664ef112.jpg

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That is badass :tup:

You won't see the difference in size of the impeller unless you open it up. It is the base diameter that is the difference. The top of the impeller is the same which is why they are interchangable. The inside allows for a larger diameter then the small Sci trim. I am not sure about the size difference but I think it is 3" for Sci and 3.25" for Si. Quick search can figure that out but I am just being lazy right now.. lol

Yeah I came across this after a bunch of searching and told the shop to let me know once he cracks it open. It's already packed up and I'm not going to undo 125' of bubble wrap, a whole bag of packing peanuts and one and a half rolls of packing tape lol
http://my350z.com/forum/attachments/...-sci-vs-si.jpg

The volute opening on mine on the inside at the impeller is 3.02", so I take it 3.00 is probably the sci then the si being a bit wider sits further back and the blades run right to the edge behind the opening of the volute? Just trying to make sure I'm clear in this. There's a ton of bs on the internet, go figure, and not easy to find hard fast information on it. Even from Vortech, or perhaps especially from them. Their old site was a lot better and much more technical information could e readily found.

So I checked again quickly and it seems it is the T trim that is 3.25" and the Si is 3". Your volute is the correct size, infortunately you won't be able to know what the impeller is until it is opened up. I sincerely hope the guy you bought it from didn't bend you over and enjoy himself too much or else I will gladly go on a road trip to Louisiana with ya bud:happydance:

Hopefully all is good Mardi Gras long over anyways. :icon17:

Found out the rebuild guy is booking about two weeks ahead right now. So with four days in either side for shipping I'm going to be without it st least a month, and that's if no parts need to be ordered.

So I rigged it up to run NA in the meantime. Slid a filter on where the blower was and fit perfectly. Might run a touch rich but otherwise should be about right for my current tune anyways since I'm logging normal driving keeping my foot out of the boost. Not what I was looking forward to but gets me out of the garage and doesn't have to sit there for another month or better.

How have you found the 928 Motorsports aluminium billet impeller?
I actually ordered and received one of these but the authorised Vortech dealer here in Australia said not to use it due to expansion/contraction of the aluminium which affects clearances and other issues setting it up properly. I ended up getting a credit for it and going with the Vortech Si impeller upgrade which also has the added benefit of a full warranty. :stirthepot:

i found this impeller is great if you want more low too mid boost, which i was looking for.
Fits great, no issues with it as of yet.

It gained me almost 40wtq over stock impeller.

https://www.ebay.com/itm/V3-Si-CCW-B...-/253805972687