Lately ive been hearing talk about maxing out D1's and I was wondering, how much boost can you get out of these things. I would eventually like to run 14-16 psi, does this mean that my D1 wont be able to keep up? Ive heard of people running 13psi on the G trim vortech which is much smaller than a D1. The smallest pulleys you can get from ATI are rated at 12psi, but that doesnt necessarily mean that you cant run more than that. Does anyone know how far you can push these things?

P.S. I know boost is relative, but im speaking in terms of what the pulleys are rated at.

 

Their website says it can handle up to 32 psi. I assume that's where parts in the head unit start breaking.

 

Well, 1400CFM * .069 * 10 = 966 flywheel horsepower.

Take an ~85% v.e. motor(stock LS1) at 346ci add 21psi at 6300rpm and bam. The D1 is at it's rated limit.

The .069 is just a conversion from CFM-->lb/min of airflow, then multiply by 10 for flywheel horspower. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

Here is a good calculator to figure this out.

http://www.smokemup.com/auto_math/airflow.php

Using this method you can get a rough idea of how much boost a given blower will make on a certain motor at max rpm. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Has anyone ever seen flow maps for the Procharger blowers?

John

<small>[ November 27, 2002, 02:12 PM: Message edited by: XLR8NSS ]</small>

 

If you can run the D1 up that high, then why are people spending the money to upgrade to the F1s when they are nowhere near the max of the D1.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by BLOWNMERO:
<strong>If you can run the D1 up that high, then why are people spending the money to upgrade to the F1s when they are nowhere near the max of the D1.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I think most people trying to run high boost with the P1SCH and D1SC are running into belt slippage problems with the small 6 rib blower pullies they need to run.

The F1 has a 5:1 transmission(compared to a 4.1:1 for the others) in it which means it should be able to show more boost with a bigger pulley which means less slippage. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

That's the only reason I can think of. I haven't seen anyone max out a D1SC yet. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

John

 

here's a thread on our new crank pulley
MMS Blower Pulley Thread
On a 346 LS1 I'm guessing about 21-22 psi at max blower speed w/out slippage.

To get 14-16 psi you can use our pulley with about a 3.85" pulley on a stock displacement motor.

 

i think ( but ot sure )the F1 flows more CFM tha the d1sc. also shows more boost at lower rpms than the d1sc.