What is the difference between this impellers?

[dovlet]

Dear all, I have just had a look at impellers for my Vortech V3 for BMW 540i m62b44tu and found out a lot of compatible different impellers with fit to my type of Supercharger.

So, could you please explain me what type of SC is my (S, SI, SCI, G trim etc)?
What is the difference on many types of impellers and what is their benefits in comparing each other?

Thanks,Capture.PNG

[pbonsalb]

Your V3 has an Si Trim or SCi trim, hich is a clipped Si Trim. If it is an Si Trim, keep it. If it is an SCi trim then change to an Si Trim. Anything more serious requires changing to a V2 or V1 blower. Them you would look at the Ti trim. How much power do you want?

[dovlet]

Your V3 has an Si Trim or SCi trim, hich is a clipped Si Trim. If it is an Si Trim, keep it. If it is an SCi trim then change to an Si Trim. Anything more serious requires changing to a V2 or V1 blower. Them you would look at the Ti trim. How much power do you want?

As per TTFS it is about 450whp 10psi 440cc injectors

[pbonsalb]

I'd stick with the Si Trim assuming that is what you have. If you have SCi, it's up to you whether to spend the money. If it is being rebuilt anyway, I would get the Si. The Si can do more than your power. The clipped version is about 10% behind.

[geargrinder]

It's the Si. No upgrade, that's the best wheel available.

[Braymond141]

Stay away from the aftermarket "upgrades" offered by Superchargerrebuilds. These parts are not better and the owner cannot get his head wrapped around how to ship them properly so they'll likely end up damaged on delivery. Been dealing with that guy for a very long time (stay away from him regardless).

There's more to this than just throwing in an impeller, you also have to change the volute. The V3 already uses T and Ti sized high speed impeller shaft bearings so you could get away with upgrading to a T-Trim or Ti-Trim impeller and volute IF you can find Vortech originals. I highly doubt you will see those come up and Vortech will not upgrade to or sell you them. I wouldn't push the rpm limit of the T or Ti though as the V3 uses self contained oil while the others are engine oil fed.

Switching to an oil fed V1-Ti is the only one I'd consider. The V1 uses straight cut gears so you get some epic charger gear whine out of these units.

[geargrinder]

The Yeah, The V1-Ti for this application makes very little sense except for bragging rights. The V3Si regularly and easily makes 500-600hp and more on S62's and domestic V8's. Its more than capable of anything any M62TU is going to do. Maybe that ex-Dirt11 / then-and-perhaps-still-Ballard540 built motor would outbreathe it (he was on a T-trim blower for a while, I think his pre-Dirt username was 'T-trim540' or seomthing like that), but that whole project was a cluster mess so who knows.

Just eyeballed the compressor maps and bar-napkin'd the breathing, and unless I screwed up my napkin scribble, the Si looks about perfect for these motors... probably sitting in a nice part of the efficiency islands - if anything still down low a bit. The Ti would be well pushed to the lower left side of the map comparatively. You'd want to crank up the air consumption a good bit in order to make the Ti sensible.

Basically for OP, the V3-Si is more than adequate and is capable of pulleying up for quite a bit before it gets anywhere near the limit, I think the block/platform will be the constraint long before the blower / compressor is.