what do they mean when they say the turbo spools up at 4500 rpm's?? is that when it is at peak force??

 

When the wastegates opens.

 

It's when the turbo starts spinning fast enough to actually start producing positive pressure on the intake side of the motor. Bigger turbo=more lag/higher spool RPMs

 

so i would want one the spools at say 2000 rpm's?? thanks for your help

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civictildeath &raquo;</TD></TR><TR><TD CLASS="quote">so i would want one the spools at say 2000 rpm's?? thanks for your help</TD></TR></TABLE>

It's a compromise. Smaller turbos will spool faster, give you more power down low but tend to run out of steam when you get to the higher RPM range. A larger turbo won't run out of power at the top but will take longer to spool up. You have to try to find a happy medium. Also it depends largely on what your horsepower goals are and what the application is going to be. If you're just going to be running your car around the street to go back and forth to work and racing once or twice during your local track's "come one come all" days, go with a smaller size turbo.
If your car is going to be a purpous built, ***** to the wall drag car with high HP plans go with a larger turbo that wil give you good gains on the upper RPM range.

 

actually it would be a DD/race when someone wants to go car. the car im putting it on isnt looking to be anything special. thats my next car

 

ideally you whould want a very fast spooling turbo like 2000 rpm AND enough umpfff to hold strong until the end. In general smaller turbos spool faster yet don't provide much top end power and are better for midrange or daily driving. Bigger turbos take a while to spool up, but offer power in the high rpms and are good for drag racing or any situation where use will use you r higher rpms. Most people try to get a balance of the two.

Ball bearing turbos offer both good spool and good top end, but are expensive (over $1000)

 

well once im moving and running it without launching it i never drop below 4000rpm and if i do launch it doesnt go below 4000 grand so i guess when im just putting around ill have to lose out then to keep the upper rpm power. thanks again

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civictildeath &raquo;</TD></TR><TR><TD CLASS="quote">well once im moving and running it without launching it i never drop below 4000rpm and if i do launch it doesnt go below 4000 grand so i guess when im just putting around ill have to lose out then to keep the upper rpm power. thanks again</TD></TR></TABLE>

There's that compromise thing. That's exactly what I was talking about. The size you pick all depends on YOUR application and YOUR driving style.

 

gotcha now. i just could never understand turbo stuff. never got anyone to explain it. appreciate it

 

keep reading tough! There is A LOT of theroy out there. You can get a huge looking turbo too spool quick if you get the right trim and A/R's and wheel stage, etc....