Like others said spool is dependant on airflow. You need as free a flow as possible without making too much dead space for the turbo to pressurize. Its a fine line in how much is good and how much is too much after the turbo (ie too big ICs).
So everything from the airfilter/intake to the exhaust/cats can help or hurt spool (and power). So choose carefully!!

 

Thanks for all the good info!

Budget-wise I have to stay with the K24/18g's (that do have upgraded springs/wg's) but I think I have a path forward especially since the motor is already out of the car:

1) already have a free flowing exhaust with 100 cell cats (and heavy soled shoes )
so that leaves:
2) turbo inlet piping
3) headers
4) upgraded hoses
5) upgraded IC's

I also have the upgraded AP throttle body (uninstalled), but am thinking about returning as I have ready/heard mixed reviews.

Does anyone have any opinions on this with regard only to spooling time and not hp?

 

Getting good info here,niiice

 

Romans,

Upgrading to an OEM style silicon hose will not help you at all, however, upgrading to a 2 1/2" silicon hose and larger Y-Pipe like ours below eliminates all OEM bottlenecks and will help you attain your goals...we offer a bundle of EVO inlet ducts, our hi-flow 2.5" Y-Pipe/hose kit and EVO IC's with matching 2 1/2" hi-flow connections for our silicon hose, which is perfect for what you desire...the Y-pipe is available in either OEM or larger throttle body sizes (75mm TB opening pictured), if you upgrade the TB.

 

The AP TB/Plenum moved my spool a noticeable amount, perhaps 150 -200 rpm lower. It is a DIY but takes some time, to fit and pressure test.

I already have bigger IC's and the normal bolt - ons as well.

 

while on this topic, while freeing restrictive flow would help, doesn't making the airways larger also lengthen pressure build up and create lag? ie commonly understood increasing size of IC's will create lag. Not sure how this applies to this car regarding lag.

 

https://www.6speedonline.com/forums/...rs-tune-2.html

lets blow this myth out of the water! reduction in pressure drop >>>>>>>>> time it takes to fill the slight change in volume.

 

there is more to it then that... a stock endtank inlet is only 1.8" ID... when we do the big ICs at 2.5" we increase the ID by .5".... thus most cars that do run big ICs also do 2.5" hard piping... it all helps...

this is what Im talking about...



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