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More on the big pulley from ASP

1080 Views 9 Replies 5 Participants Last post by  Buellwinkle
I think that I have read about every post in this forum regarding big pulleys. I appreciate all of the information that Buellwinkle and Linh have shared. I still have a couple of questions; the #1 question being: How was the size of ASP's pulley decided upon?

I believe that I read somewhere that the ASP pulley is 15% overdrive. If I'm correct on this figure, why not 12%, 18%, or even 20% over? Were there any trials done with other sizes?

Any engine studies done that showed a size to be too big?

Any boost pressure data, before and after the pulley? (I saw that Deathy posted that the new pulley should give a 4 pound increase in boost, but that's the only reference to pressure I've found.)

I almost stopped by ASP Racing today to see if someone in-house could answer these questions, but then decided it may be best to post here first and see what response I get.
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Thanks for all that info, Linh. No, I know better than to try to design my own pulley. I now understand that our superchargers are only good for 11-12 psi boost, and that the ASP pulley gets us there. It looks like you and Buell have really checked out all the angles on this application.
linh - 3/1/2005 5:19 PM
It too bad that Buellwinkle and i waste alot of times and money trying to find a good upgrade intercooler to go with the pulley but there was none that give good hp gain and the price from $800-$1000 !!
Yeah, that is true. I read most of those intercooler posts. Some of those intercoolers looked like they were serious business. Just goes to show how looks are deceiving when it comes to things like intercoolers, exhaust systems, etc. Well, at least you guys are famous now. And, Deathy can go faster now for only $350.

What do you think about those people who are spraying nitrous through the intercooler in the way that you are using aquamist? Do you think that evaporating nitrous really can cool down the intercooler effectively?
430 - 3/2/2005 11:41 AM

First off spraying Nitrous on the intercooler is very different than using Aquamist. Aquamist injects a fine jet/mist of water into the engine to cool combustion charge and to effectivly raise the octane rating of the fuel being used. You can create very detailed mapping with the right options.

Second, Nitrous is very cold as it expands leaving the compressed bottle and is very effective in cooling the intake charge in the intercooler. Not sure if it is worth it in our cars. But if you are turbocharged and running high boost it can make a big difference.
Thanks, 430. I see that I confused Linh's Aquamist system with his experiment that involved using the headlight washer fluid pump to cool the intercooler by spraying water on it.
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