So the Radix will make full boost as soon as you slam the pedal? It's not RPM dependant? Say if you mash the throttle and the stock converter flashes you to about 1900-2000rpm or so you will already be at full boost? If so that is pretty wicked. How does it achieve that? I know on a centrifugal SC you can change how fast boost comes on by changing step-up ratios and such but I am foggy on how a roots style does it.

As much as I go back and forth with you guys on which SC/Turbo is best you must realize I think the Radix is a great kit and often reccomend it even over my STS setup.

 

Roots and twin screw are both positive displacement blowers. That means they ingest the same amount of air with each revolution. The pulley determines the percentage more air (boost) that your engine can ingest on its own. So boost stays the same throughout the rpm range umtil efficiency of the blower drops off.

Centrifugals gain the ability to produce more airflow as rpm of the impeller increases, so boost increases with rpm.

Instant boost would be badass!

 

Not sure how the tt3000 affects it, but when I mash the pedal at any speed/rpm, I will see about 6.5 immediately and around 7 right before the shifts.

 

I would disagree with that some. The boost number I always give out that I attained with the Radix (10.3psi) was only ever hit just before the shift. That was shifting at 6200 and sometimes 6300. Didn't always peak in the 2-3 shift, but for sure on the 1-2. It did this in every cam I put in my truck, from small to big. Don't get me wrong, I would hit about 8.5-9psi at about 3000-3500rpms, but to hit peak was seconds later. Never could you do a 7psi launch, and not so sure if you can get it to give 1lb prior to launch. I never could, but honestly didn't try it too often.

 

I did it a few times..... Then it was time for the 80-E.

 

I love launching at 7psi. Takes me a sec to get it there but when I do I know a killer 60' is about to happen as long as I didn't get too much heat buildup. That EV08, I raced from a stop, sure was suprised when I rocketed past him in the 60' ON THE STREET. Hahaha

I am taking it easy this week so I don't blow this tranny before I get some real track #s.

 

I guess that is pretty much expected with any power adder

 

I tried launching at the track under boost, but I couldn't hold it back with that much power going at it. I ended up jumping the gun and getting a horrible start.

 

I thought a roots pushed air and a screw built compression actually needing a few more rpm to build like boost as a roots.....but not as many rpm as a turbo or centrifugal.

 

maybe I'm to old to remember right, but when we are talking instant boost I associate that with off idle boost, i.e. no brake stalling. In this respect I believe the radix (roots) is superior hands down.

What is everyone else's intrepetation of instant boost? otherwise we may be talking apples to oranges...