Turbo Quest

[ezrollin]

If you set limits for a given engine[3.4 93-95 camaro] at 15 psi boost@6000rpm max. and looking for 400-425 hp couldn't you select the most efficent turbo[fastest spool-up] within those limits? I have been reading all that I can find on turbos and getting "max boost" by corky bell but would like some opinions.

[Guest]

Yeah, that's how I normally try to select a turbo, as I'm sure most people who build turbo systems do as well.

[X11_STE]

Best bet is to learn to read a compressor map and select your turbo from there. Kinda complex but your engine will thank you for the extra effort.

[ezrollin]

Thanks! Looked at some maps but havent found any definitive infoon how to read them. Sending for
"max boost" to increase my knowledge.

[timg]

http://www.turbobygarrett.com

They have maps and how to read them.

Tim

[Joseph Upson]

Go here; http://www.turbofast.com.au/freesoftware.html and download turbocalc, it will give you a very good idea of what you need although it's a little friendly on the optimistic side it will give you the flow for your engine and horsepower combo to make using a compressor map much easier in addition to the maps it contains and will post your entry points against.

[bjornmk1]

volumetric efficiency

hi joseph..I am new here... but my advise would be
keep an eye on the volumetric efficiency of your engine.
a dohc 3.4L would need a bigger turbo to max out than for example
a 3.4 with only 2 valves per cylinder.

just my 2 cents

[Joseph Upson]

Taking the horsepower approach to size for the turbo will work in his favor in that regard because the power rating he's aiming for will be the limitation more so than the engine, I didn't catch whether or not he's using the 3.4 or the 3.4 DOHC in which case if it's the latter he will not need as much boost to reach the goal.

I've seen that supercharger setup somewhere before, nice piece of work, but I prefer the turbo whine.