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Join Date: Sep 2002
Location: Westchester County, NY
Posts: 1,711
Selecting turbo based on pre-determined boost level?

Tippy made an interesting post in Rey's EFI Mistress thread about modern turbos working better or being optimized at higher levels of boost. Rather than take that very cool build thread OT, I thought I'd start a new thread. Efi conversion to the Mistress

Originally Posted by Tippy View Post
Gotcha. Just stating these modern turbos are deliver the goods at higher boost pressures than lower.
Example, our engines using a 60-1 is pretty well matched with say a bar. Move to 1.5 bar, and the 60-1 is out of breath.
Take your Garrett. At 1 bar, it's not really generating a lot of airflow. Turn it to 1.5, and it comes alive.
Modern compressors like higher pressures.
If all other things were equal (comp ratio, displacement, mods) how should one pick a turbo if you knew ahead of time you would run 0.7 or 1.0. or 1.2 lbs of boost? Is this where turbo maps really come into their own, where there is one sweet spot so pick the right one for your desired boost level (not HP number)?
1986 930, 1969 Mach1, 2003 540 Sport, 2016 R1200RS
Old 05-12-2014, 12:58 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 8,715
Yep, maps are everything.

Read Garrett's turbo tech; it explains it all.

Squirrel Performance has a built in calculator you can play with too that's pretty fun.

The turbine side is harder to figure. Compressors are pretty cut and dry. Meaning, balancing response to peak airflow/hp parasitic loss is a little trial and error on the turbine side.

Last edited by Tippy; 05-12-2014 at 05:23 PM..
Old 05-12-2014, 05:21 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)

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