Friday night bump for the OP. I have the same problem.

Anyone?


Here's a pic of my Vortech v2 for everyone who likes pics too:

 

Thought I would report an update for others that might have this issue. I felt like I could not claim the 928 seal was bad without making sure I had very good crank case ventilation. Better ventilation will add some power so it's worthwhile anyway. So, I intalled a modified valve cover with two -10AN bungs (behind the front & middle VC internal baffles), two Saikou Michi S2-0CC oil seperator catch cans, with both 5/8" lines pulling a vacuum off the intake (before the SC). I plugged the PVC outlet (which could be used if more ventilation is needed) and installed an air filter to the factory breather port to bring in some fresh air (or vent excess pressure if there was any). I also temporarily hooked up a cheap ($15 at Autozone) vacuum/boost gauge to the valve cover to see if I could actually pull a vacuum. After a test drive, I found that I was pulling a very very slight vacuume under all engine loads. That was good news. The problem is that my impeller seal still leaked!!

I talked to Carl at 928 Motorsports and he was a bit quite surprised by the results. He thinks the impeller shaft might be bad. The problem is that Vortech won't sell the impeller shaft or the seals unless they install them. Since the 928 impeller was very tight going on, I am sending the SC to Carl to remove the impeller & install the Vortech impeller (Vortech won't touch it with the 928 impeller installed). Once I get it back, I will send it to Vortech for another rebuild (only 1k miles since the full 928 rebuild) & hopefully they can find the source to the problem. I will post the findings.

Here are pics of my crank case ventilation set up for those that are interested. I must say that dealing with Saikou Michi (http://www.saikoumichi.com/ ) was a very good experience.










Do you guys think I am on the right track? Am I missing anything? I am open to suggestions or criticism.

Thanks!

 

Happy to finally say that my impeller seal is not leaking!!

After sending my blower back to Carl at 928 Motorsports, he removed the 928 improved impeller and reinstalled my old Vortech impeller so I could then send it to Vortech to figure out what the problem was. Vortech said the gearcase was questionable as the bearings were not tight in the case. They would not speculate why the seal leaked or why the bearings were loose. Vortech was gracious enough to give me a $1000 credit towards a new V2 with the improved Si impeller.

I wish we could have found the root cause. Not sure if it was the actual 928 seal, 928 bearing specs, or bearing installation methods used by 928 Motorsports. I called and emailed 928 after they swapped out the impeller and they would not respond. I just want to figure out what happened. It appears to me that they simply don't care. I am happy that 928 gave me back ~$450 credit for the 928 impeller they sold me so I am now only out ~$550 for their "rebuild". I should have just left it alone while I was rebuilding my motor. It had no issues before 928 touched it. At least now I can finally get out & drive it.

By the way, the new Vortech Si impeller feels just as strong at the 928 impeller which is good too.

 

Thanks for the info..... I would have been in the same boat here in a couple of months if i didnt come across this! What are my options when i upgrade my CT 1220sl to a CT 1200????? Is their an impeller I could upgarde to???
..Or should I just go with a 1500 (dont know much about the 1500 and what is needed for this)

 

just sent a novi 1000 to Paxton because I was scared of 928 glad I did good info

 

I am not the one to ask about the differences in your superchargers. I can only recommend not to use 928 Motorsports for your bearings, seals, or rebuild services. If you get their impeller, expect that it MIGHT hit the volute & you will have to have your volute machined to match your new impeller (this happened to me with the 928 impeller). Personally, keep the SC all stock so they can service it if something goes wrong. My lesson after all this.

Oh, just a correction, after driving it a few months, my comment above that the Vortech Si impeller is equal to the 928 impeller is in accurate. The 928 impeller had a little more boost (sorry no specifics) but the minor difference is not worth it to me. I will find power elsewhere...

 

What are my options when i upgrade my CT 1220sl to a CT 1200????? Is their an impeller I could upgarde to???

..Or should I just go with a Novi 1500 (dont know much about the 1500 and what is needed for this)

 

That is a totally different topic. I would recommend doing some research with the search above or starting a new thread.

 

Seems lots of people have had issues with 928. Too bad. Seemed like a great option for sc guys! I'm definitely sticking to vortech for upgrade/rebuild!

 

Upgraded to a Novi 1200 and opted to not deal with it or Carl at 928 any further.

After dealing with him for blower service/upgrades and pulleys, I have learned that he is basically a hack with some machine tools, so he can make some money on the side when he isn't racing and working on what he knows, which is his Porsche. He does little research on the equipment we send him to work on and assumes no responsibility or accountability when things go bad. He expects you to be the expert, knowing all the bearing, seals, shaft diameters etc for him to work on because he wont check/verify them. For example, if you asked him what the shaft diameter is on your Novi 1000 so you could buy one of his pulleys, he wouldn't be able to tell you (well he might now since I educated and scolded him after sending me the wrong part that he doesn't apparently make) So you need to research what that is through some other vender or resource. That's real assuring when he is rebuilding your $2000 blower