I also am interested in the BR 440 please owners let us know.

 

guess maybe ill be looking at the RNR or AMS then instead.

 

i have the 440. I luv it

 

Our kit has proven itsself in quality, fitment, longevity, and pure power making capabilities time and time again.

To quote Dan from Pruven Performance "So far it seems to be the perfect turbo kit. I can't wait to get it on our shop car! With a little bit of tuning and with the mods on our car, I don't see why we couldn't break 700 horsepower (without nitrous) fairly easily."

 

I had the BR500, Stg4 and the car made 398whp on a DD dyno approx 470-480dynojet. I have sent the 500 in for a trade for the 440 because in my opinion there was to much lag, approx. full boost by 4600-5000 first gear....

 

The original Buschur kits are going to spool slower than the competitors for two reasons. They were not Ball Bearing and they did not implement large equal length runners. These two combined offer quicker spool up. Besides that, power should be consistent with other kits out there. Dyno charts should show the differences relative to spool up. On the track, differences would probably be noticed in 60ft times. Hope this was useful.

 

Is this in regards to the 440?

 

Umm no, I would be refering to OUR kit, the AMS GT35R kit.

 

ohh ok, sorry about that. I didnt see your sig.

 

Large equal length runners will not help spool in the least until the upper rpm ranges. In fact, spool will come on later as it needs to fill volume. Shorter runners, the quicker the response, the longer the runners, the more gas velocity in the upper ranges. On a nicely designed cast manifold, it won't make much of a difference. The fastest AWD DSM in the world runs a cast manifold and the fastest street class honda's/acura's run a cast manifold...sorry, but true..

BB turbos are great, but a BR500 and 580 is based on a larger GT32 w/ a 76mm comp wheel which equates to a big GT30R w/ a slightly bigger turbine wheel. If you want to compare turbos, you'd compare this to a GT3037 which will be equally laggy but faster spool up when boost is reached. The characteristics of a BB turbo is quicker recovery and fast spool at the onset of boost. A BR440 turbo will outspool a T3/T4E 50 trim and even a GT28RS w/ .86 housing which are the turbos you would compare it to. But the BB turbos will hit like a sledgehammer once boost is reached...

 

Anything that increases exhaust gas velocity will drop the spool time. Shorter, smaller runners will drop the spool time. If they are too small, top end power will suffer. A larger, longer runner will spool slower.

Obviously, the exhaust pulses don't care about the visual appearance of the manifold, only the efficiency of the runners. One advantage that a cast manifold has is that it retains more heat, which increases exhaust gas velocity.

 

I am comparing BB turbos against non-ball bearing turbos. Not here for a physics lesson, but only to point out the obvious. The turbo combinations being dynoed today with quicker spool have been the BB versions with equal length headers. I am not debating maximum power as previously stated. Only the spoolup characteristics of the different kits. Re-read through the numerous posts about spoolup with the various turbo kits. This isnt a theoretical debate, this is real life. Theory is great, in theory.

Chris

 

The challenge is in correlating theory with reality, and upon doing so, one can make very reliable predictions.

Theory dictates an impeller with lower rotating friction spools more quickly,and it does.

Theory indicates that equal length runners should be more efficient at spinning the hotside wheel, and they are. They would even be more so if cast in a medium that retained more heat - but that doesn't seem to exist.

Theory also indicates that the design of the housing will influence both spool and power characteristics, and it does.

I see no fault in theory here.

 

Cool. So we both are right????????

 

It looks that way to me...