Looking at running a roots blower on a GSR and curious to what are the benefits to running low compression and more boost and the benefits of running low boost high compression. Try to give me some technical answers not just "such and such is better end of story". Thanks

 

The absolute best condition is having high compression AND high boost. However, it is not very easy to achieve this reliably. Most of us need to run on pump gas, and can't spend many thousands on tuning all the time.

The general consensus for ease and reliability is low compression and high boost. This is if you want to make good power. With high compression, there is much less turbo lag. The spool up time is much quicker. There are lots of technical "how turbos work" on the Internet that you can read, so I don't have to type it out, but that's the gist (sp?) of it.

Did you ever hear those large tractor trailer trucks? They're running extremely high boost and extremely high compression. That's why they are almost fully spooling going 3mph accelerating from a stop. They are diesel too, however, but still.

EDIT: I just did a little searching in the forced induction forum and found some informative posts. I forgot a few things since I got rid of my turbo car, so my memory is a little off. Try looking in there.

 

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I would imagine (speaking stricktly from theory) high boost/ low compression. Turbo lag isn't much of an issue since, well, it's not a turbo. Since right there you've removed a huge downfall of low-compression turbo motors, I would say go with even lower compression.

IMO, your first priority should be to cram as much air in there as you reasonably can with that roots blower, and then change the compression to a safe level based on the resulting boost/ air temperature.

 

Anything else anyone want to add?

 

what is high boost to you? and what sc? if its like the jrsc you cant run too high of boost because it will over heat the blower. i have a friend that works at jackson and he says they shouldn't run more than 10-11 pound.

 

You also need to consider charge temps when you are running higher boost levels....above 9 psi its the general consensus you really need an intercooler.