ESS (esstuning.com) BMW N62 650i/550i V8 Supercharger Sneak Peak - Coming Q1 2011

this would have been awesome in 2005

whats the difference between this and a "proper twin screw" ? I thought roots were twin screws

Originally Posted by FR305

this would have been awesome in 2005

Hehe, good point as well.

Originally Posted by DD GT3 RD

whats the difference between this and a "proper twin screw" ? I thought roots were twin screws

Roots and twin screws are different. Both are positive displacement, however one compresses internally and the other externally.

That's a simple one - Roots are cheaper to product and the OEM's like cheap and reliable. The complex curves of the male and female twinscrew rotors make it much more expensive to produce. But when a Cobra wants a hefty upgrade, they switch to a KB or Whipple twinscrew, usually bigger, but for the efficiency as well. Twinscrews actually are compressors where Roots (including the newest Eaton TVS) is only an air mover. That gives the twinscrew a leg up on the efficiency curve which translates to less heat at a given boost level.

Notice cars like cobras switch from Eaton Roots to twin screws and make more power, even at the same boost?

You do realize that this is the Eaton TVS blower that is used in the ZR1 and the CTS ? If not you should do some research before making such statements. The TVS is one of the most efficient blowers in the world and is the reason it was selected by Chevy for the ZR1. This design blows away any centrifugal blower design. This is a smart choice for this type of motor. Google the TVS and do some reading, you will see it is a very good blower design. If you still need educating visit the ZR1 forums

Originally Posted by ZR1638

You do realize that this is the Eaton TVS blower that is used in the ZR1 and the CTS ? If not you should do some research before making such statements. The TVS is one of the most efficient blowers in the world and is the reason it was selected by Chevy for the ZR1. This design blows away any centrifugal blower design. This is a smart choice for this type of motor. Google the TVS and do some reading, you will see it is a very good blower design. If you still need educating visit the ZR1 forums

You should do some research on how a roots compares to a twin screw and the Eaton's are not the most efficient blowers in the world, get out of here with that nonsense. They are used by OEM's for cost and look at what happens to cobras, lightnings, GT500's, when they dump the Eaton's for twin screws.

I suggest you do some searching on google, let me help you: http://lmgtfy.com/?q=eaton+vs.+kenne+bell

Originally Posted by Sticky

You should do some research on how a roots compares to a twin screw and the Eaton's are not the most efficient blowers in the world, get out of here with that nonsense. They are used by OEM's for cost and look at what happens to cobras, lightnings, GT500's, when they dump the Eaton's for twin screws.

I suggest you do some searching on google, let me help you: http://lmgtfy.com/?q=eaton+vs.+kenne+bell

Once again you have showed how dangerous someone with an opinion and no knowledge can be on the internet. You are comparing twin screw to old Eaton product. This is a TVS blower a brand new product that you obviously have no knowlwdge of other than what you can dig up with a quick google search under eaton. here is something for you to read.

http://www.eaton.com/EatonCom/Market...rchargers/TVS/

And here is a direct comparison of a twin screw and a TVS blower with actual data ! something you have yet to post in your attempt to lump all eaton blowers together. Take notice of the the direct quotes including this one.

" I personally think the TVS will prove to be more efficient design until you get into boost exceeding 16 PSI (as I have shown above)...but even respecting the twin-screws advantage at higher boost levels above 16 PSI, taken as a whole I think the TVS will still have more "area under the curve" if you will and be overall superior to the twin-screw design."

http://www.modularfords.com/forums/s...omparison-maps

Now if you have some actual technical data to post and not just your "opinion" please feel free to post it. The ZR1 runs less than 11 psi and im sure this supercharger kit shown here will not run anything near 16 psi. The techical data in this thread has been proven the advantage to TVS over twin screw under 16 psi. I will say it again there is a reason this blower is used in the ZR1.

Originally Posted by ZR1638

Once again you have showed how dangerous someone with an opinion and no knowledge can be on the internet. You are comparing twin screw to old Eaton product. This is a TVS blower a brand new product that you obviously have no knowlwdge of other than what you can dig up with a quick google search under eaton. here is something for you to read.

First of all, this is a TVS 1900, ok? The ZR-1 uses a 2300 but both are roots blowers and both are less efficient than a proper twin screw.

Originally Posted by ZR1638

And here is a direct comparison of a twin screw and a TVS blower with actual data ! something you have yet to post in your attempt to lump all eaton blowers together. Take notice of the the direct quotes including this one.

Lump all blowers together? Do you have reading comprehension issues? I'm making a big difference between a roots and a twin screw here, try to keep up. The Eaton TVS blowers are a newer roots style but still less efficient. What that person posts in their opinion highlights a good point as once you start pushing the Eaton's, including the TVS blowers, they rapidly lose efficiency compared to a twin screw due to the heat built up.

Originally Posted by ZR1638

Now if you have some actual technical data to post and not just your "opinion" please feel free to post it. The ZR1 runs less than 11 psi and im sure this supercharger kit shown here will not run anything near 16 psi. The techical data in this thread has been proven the advantage to TVS over twin screw under 16 psi. I will say it again there is a reason this blower is used in the ZR1.

Here is some technical data regarding roots vs. twin screw, THE ROOTS IS NOT AS EFFICIENT, sorry to burst your bubble:

http://www.kennebell.net/techinfo/ge...romcatalog.pdf

Roots-type superchargers have been proven to not be very efficient, especially at higher ... Positive displacement twin screw design has the highest efficiency of all

http://www.whipplesuperchargers.com/...sp?ProdID=1162

Please learn the difference between a roots and a twin screw, ok?

Also, because the twin-screw supercharger develops compression internally, it has a much better thermal efficiency of 70-80% compared to the 50-60% of the Roots supercharger. The improved thermal efficiency makes the twin-screw supercharger ideal for applications that require medium to high boost with good boost starting from low engine RPMs. However, the stronger construction is required to withstand internal compression, increasing the cost of manufacture.

Now run along and do some reading, and realize that because an OEM uses something doesn't mean it is better, they choose it for cost and reliability. Unless you can explain why any time an eaton blower is bolted off and replaced by a twin screw even at the same boost the screw makes more power? Uh, it's because the twin screw is more efficient, backed up by data, thanks for playing.

Rough price estimate?

Originally Posted by jchris

Rough price estimate?

No idea yet but it won't be any less than $6k and not more than $10k I would think.

Sorry Sticky you are incorrect on TVS VS Twinscrew. Older Eaton Roots blowers are not TVS blowers. Different design and different performance. If you have technical data comparing TVS blowers VS twinscrew like I have posted please post it. Posting general info on Eaton blowers and calling them TVS is retarded as older eaton and the new TVS are two different products.

Originally Posted by ZR1638

Sorry Sticky you are incorrect on TVS VS Twinscrew. Older Eaton Roots blowers are not TVS blowers. Different design and different performance. If you have technical data comparing TVS blowers VS twinscrew like I have posted please post it. Posting general info on Eaton blowers and calling them TVS is retarded as older eaton and the new TVS are two different products.

I am not incorrect at all as they are both roots designs, new TVS or old Eaton, does not change it. I posted technical data, you for some reason decided to ignore it.

Updated, seems it is still coming: