judging by the questions you are asking i've guessing you have never driven a boosted car, get a friend with a DSM and a boost gauge and just drive around in it watching the boost gauge

 

my friend has a twin turbo 350z. he let me drive it around, and if you take it easy, the gauge registers really low.

 

Exactly the point... lower the rpm the less effect of the turbo... 3500 rpm is pretty average for it to kick in. I have my GS-t Tuned at 3000 rpm. With a HKS turbo timer.

 

so in other words, the softer u drive, the better the milage.

 

that goes for any car turboed or not

 

Not entirely. Remeber the turbocharger not only helps you in the HP department,but also alows more air travel through the engine, which in turn better mpg.

But like Live2rice said... Dont go Boosting down the street to your gf's house.

 

so, if i understand u corectly, a little tiny bit of boost increases milage, but lots decreases?

 

No .... the increase when not in boost is caused by the restriction of the turbo in the exhaust stream. I intentionally left out the word "backpressure" because while it best describs this effect, it is not really accurate. You need to understand flow regimes to really understand what is happening in the exhaust.

To learn a bit about how the turbo works and how you can stay out of boost, look up "turbo wastegate" and "turbo blow off valve" on Wikipedia. "Turbo boost controller" could help too after you understand the first 2 articles.

The only way that I know of to fix the wastegate open is to remove the spring which disables the turbo completely ...... it's a good way for a DIY installed system to get to the shop for it's tune ..... running NA, just with the turbo system bolted on.

 

so, i understand now. thanks. but if i run 6 or 7 pounds,with all stock internals, how much danger is there of messing up my engine??

 

If you have a good compression test, it will only shorten the life of the engine as long as it's well tuned. Maybe reducing it from a 350,000 mile lifetime to a 200,000 mile life. The engines aren't usually the reason for people getting rid of Hondas.