It's been a while since I've checked this thread. There has been a lot of interesting postings. I was hoping to get a little more of the facts to what supercharger you select for the engine you are building.

For example you don't buy a Semi truck for a daily driver, it would be a bit pricey and a little over kill. The manufacturers offer stages for thier superchargers. When is a stage 1 sufficient and when is a stage 5 needed?

You may be over thinking this. A wieand 871 (cost effective) could get the job done if you we're on the high side of compression for forced induction. Still a 1071 may be a better choice...spin it slower and make less heat. Add a chiller and you will be spinning the blower faster to make the same amount of boost but shoving in a denser charge. Spinning the blower faster = shorter rebuild intervals. A 1271 would definitely get the job done and at slower speeds but it may have rotor leakage at lower rpm which throttle response could be affected. Not sure what all the stages are but I think a tip stripped high helix 1071 closed off discharge would fit the bill great. Bds, little field, tbs all good choices.

Jason, check ou Dyers. He made me a set for my 575Sci's and everything fit perfect.

http://www.dyersblowers.com/187/index.html

You may want to call DMPE in holland. He deals in TBS and has his own designs of blowers. His website is pretty serious into drag stuff. I'm no expert by any means.

Also check this out...some basics. Page 11 will give you some size data.

http://www.holley.com/data/TechServi...ech%20Info.pdf

1271 Stage 5 Baby! Then double clutch and shift your 5 speed 7 times like Fast and Furious and you will have one sweet ride!

I agree with you Jason, its hard to figure out what to buy when every manufacture says they have the best supercharger, and there is no test data to prove it, just theories.

Seems like the 1071 is a little small (but would work) for you nicely built 598 and the 1471 (but would work) is a little big so IMO the 1271 is perfect. BUT, like you said, what Custom options should it have and why? Sorry don't know the answer to that part.

Here's a link to our 575sci conversions to 871s.

Polished 871s are $3750.00 per engine.

http://www.dyersblowers.com/187/1676.html

Bill Dyer

And thank you for all the great information, knowledge and insight to this thread!

So 1071, 1271, or 1471 ? How do you choose?

And what options done to the blower?

Still a little confused on these

Engines will be 8.5:1 compression ratio and will be running a chiller.

After several months and a lot of over thinking this. I come to decision. I'm going to run a BDS 16-71 hi-helix billet rotor standard discharge. I was hoping to be able to use a scientific way of deciding but in the end I'm using opinions of the experts in the industry. I hope I made a good choice. We will have to wait and see.