finding the right turbo

[Fiorelli]

Any one have any equations or know of any books that tell you how to figure out what turbo you need. I'm looking for the maxium boost at the lower RPM's 1500 to 2500 RPM range maybe lower and if the boost is 0 over 3000 that is fine. any good books would also be nice. I can't say I've seen anything that helps me most are giving information for engines running over 4000 rpms and the boost they have there is about right for what I want at 1000 to 1500. I'm sure I want a waste gated turbo. Probably want to limit the boost to around 15 psi.


There has to be a program or equation that will tell you how much boost you should develop if you know your CID, CR, CFM's, RPM, some turbo info, and what every else would factor in.

Jeremy

 

[fast64ranchero]

Good luck finding anything for the exhaust side, for the pressure side look on the net at a site called "not2fast" then turbo calc. it is the best site I have found for sizing.

 

[fastback69]

Maximum Boost by Corky Bell and Turbochargers by Hugh McInness. There's a lot of good info on www.turbomustangs.com . They have a "turbo bible" and archives that can be searched. Please read the bible and search for answers before asking questions. There are formulas for figuring out airflow from the compressor and several online calculators. Big turbines will flow more but won't spool quickly on small engines. Small turbines will spool quickly but become a restriction in the exhaust once gas flow is too high. Backpressure between the turbine and engine should be 2X intake pressure or less. A small T04 turbine will work best for a low rpm 300. A tangential housing (divided preferably with the exhaust split between inlets) with an A/R of .68 and a "O" or "P" trim will work best. Engine mods also affect turbine performance. There are a few guys on turbomustangs with 302's using this turbine and they see full boost by 2200rpms.

 

[Fiorelli]

Thanks for the link to not2fast.com that helps lots. I haven't had a chance to check out www.turbomustangs.com

I'll have to check into the books.

Thanks Jeremy